visus
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teensy-audio
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teensy-audio/gui/index.html

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  1. <!DOCTYPE html>

  2. <!-- vim: set ts=4: -->

  3. <html>

  4. <meta charset="utf-8">

  5. <meta name="viewport" content="width=device-width, initial-scale=1, maximum-scale=1, user-scalable=0"/>

  6. <meta name="apple-mobile-web-app-capable" content="yes">

  7. <meta name="mobile-web-app-capable" content="yes">

  8. 

  9. <!--

  10.   Modified from original Node-Red source, for audio system visualization

  11. 

  12.   Copyright 2013 IBM Corp.

  13. 

  14.   Licensed under the Apache License, Version 2.0 (the "License");

  15.   you may not use this file except in compliance with the License.

  16.   You may obtain a copy of the License at

  17. 

  18.   http://www.apache.org/licenses/LICENSE-2.0

  19. 

  20.   Unless required by applicable law or agreed to in writing, software

  21.   distributed under the License is distributed on an "AS IS" BASIS,

  22.   WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.

  23.   See the License for the specific language governing permissions and

  24.   limitations under the License.

  25. -->

  26. <head>

  27. <title>Audio System Design Tool for Teensy Audio Library</title>

  28. <link href="bootstrap/css/bootstrap.min.css" rel="stylesheet" media="screen">

  29. <link href="jquery/css/smoothness/jquery-ui-1.10.3.custom.min.css" rel="stylesheet" media="screen">

  30. <link rel="stylesheet" type="text/css" href="orion/built-editor.css"/>

  31. <link rel="stylesheet" type="text/css" href="font-awesome/css/font-awesome.min.css"/>

  32. <link rel="stylesheet" href="style.css">

  33. <style>

  34. table.doc {border-spacing:3px; border-collapse:separate; font-size: 80%}

  35. tr.top {background-color:#C0C0C0}

  36. tr.odd {background-color:#F0F0F0}

  37. tr.even {background-color:#E0E0E0}

  38. p.func {padding-bottom:0; margin:0px}

  39. p.desc {padding-left:2em; margin:0px; padding-top:0.2em; padding-bottom:0.8em; font-size:0.75em}

  40. p.exam {padding-left:2em; text-indent:-1.2em; margin:0px; padding-top:0; padding-bottom:0.5em; font-size:0.75em; font-weight:bold}

  41. pre.desc {padding-left:3em; margin:0px; padding-top:0em; padding-bottom:0.8em; font-size:0.75em;

  42. 	background-color:#FFFFFF; border:0px; line-height:100%;

  43. }

  44. span.indent {padding-left:2em}

  45. span.literal {color: #006699}

  46. span.comment {color: #777755}

  47. span.keyword {color: #cc6600}

  48. span.function {color: #996600}

  49. span.mainfunction {color: #993300; font-weight: bolder}

  50. </style>

  51. </head>

  52. <body spellcheck="false">

  53. <div class="navbar navbar-inverse navbar-fixed-top">

  54. 	<div class="navbar-inner">

  55. 		<div class="container-fluid">

  56. 			<span class="brand">Audio System Design Tool for <a href="http://www.pjrc.com/teensy/td_libs_Audio.html" target="_blank">Teensy Audio Library</a></span>

  57. 			<div class="btn-group pull-right">

  58. 				<a class="btn dropdown-toggle" data-toggle="dropdown" href="#"><i class="icon-align-justify"></i> <span class="caret"></span></a>

  59. 				<ul class="dropdown-menu">

  60. 					<li><a id="btn-sidebar" tabindex="-1" href="#"><i class="icon-ok pull-right"></i><i class="icon-list-alt"></i> Sidebar</a></li>

  61. 					<li class="divider"></li>

  62. 					<!-- <li><a id="btn-node-status" tabindex="-1" href="#"><i class="icon-ok pull-right"></i><i class="icon-info-sign"></i> Node Status</a></li>

  63. 					<li class="divider"></li>

  64. -->

  65. 					<!--

  66. <li class="dropdown-submenu pull-left"><a tabindex="-1" href="#"><i class="icon-edit"></i> Import from...</a>

  67. 						<ul class="dropdown-menu">

  68. 							<li><a id="btn-import" tabindex="-1" href="#"><i class="icon-edit"></i> Clipboard...</a></li>

  69. 							<li id="flow-menu-parent" class="dropdown-submenu pull-left">

  70. 								<a tabindex="-1" href="#"><i class="icon-book"></i> Library</a>

  71. 								<ul class="dropdown-menu"></ul>

  72. 							</li>

  73. 						</ul>

  74. 					</li>

  75. 					<li id="li-menu-export" class="dropdown-submenu disabled pull-left"><a tabindex="-1" href="#"><i class="icon-share"></i> Export to...</a>

  76. 						<ul class="dropdown-menu">

  77. 							<li id="li-menu-export-clipboard" class="disabled"><a id="btn-export-clipboard" tabindex="-1" href="#"><i class="icon-share"></i> Clipboard...</a></li>

  78. 							<li id="li-menu-export-library" class="disabled"><a id="btn-export-library" tabindex="-1" href="#"><i class="icon-book"></i> Library...</a></li>

  79. 						</ul>

  80. 					</li>

  81. 					<li class="divider"></li>

  82. -->

  83. 					<!--

  84.  <li><a id="btn-config-nodes" tabindex="-1" href="#"><i class="icon-th-list"></i> Configuration nodes...</a></li>

  85. 					<li class="divider"></li>

  86. -->

  87. 					<!--

  88. <li class="dropdown-submenu pull-left"><a tabindex="-1" href="#"><i class="icon-th-large"></i> Workspaces</a>

  89. 						<ul id="workspace-menu-list" class="dropdown-menu">

  90. 							<li><a id="btn-workspace-add" tabindex="-1" href="#"><i class="icon-plus"></i> Add</a></li>

  91. 							<li><a id="btn-workspace-edit" tabindex="-1" href="#"><i class="icon-edit"></i> Rename</a></li>

  92. 							<li><a id="btn-workspace-delete" tabindex="-1" href="#"><i class="icon-minus"></i> Delete</a></li>

  93. 							<li class="divider"></li>

  94. 						</ul>

  95. 					</li>

  96. 					<li class="divider"></li>-->

  97. 					<li><a id="btn-keyboard-shortcuts" tabindex="-1" href="#"><i class="icon-question-sign"></i> Keyboard Shortcuts</a></li>

  98. 					<li><a id="btn-help" tabindex="-1" href="http://node-red.github.io/docs" target="_blank"><i class="icon-question-sign"></i> Help...</a></li>

  99. 				</ul>

  100. 			</div>

  101. 			<div class="btn-group pull-left">

  102. 				<a id="btn-deploy" class="btn action-deploy disabled" href="#"><i id="btn-icn-deploy" class="icon-upload"></i>Export</a>

  103. 				<a id="btn-import" class="btn action-import disabled" href="#"><i id="btn-icn-download" class="icon-download"></i>Import</a>

  104. 			</div>

  105. 		</div>

  106. 	</div>

  107. </div>

  108. <div id="main-container" class="sidebar-closed">

  109. 	<div id="palette">

  110. 		<img src="img/spin.svg" class="palette-spinner"/>

  111. 		<div id="palette-container" class="palette-scroll">

  112. 		</div>

  113. 		<div id="palette-search">

  114. 			<i class="icon-search"></i><input id="palette-search-input" type="text" placeholder="filter"><a href="#" id="palette-search-clear"><i class="icon-remove"></i></a></input>

  115. 		</div>

  116. 	</div><!-- /palette -->

  117. 

  118. 	<div id="workspace">

  119. 		<ul id="workspace-tabs"></ul>

  120. 		<!--<div id="workspace-add-tab"><a id="btn-workspace-add-tab" href="#"><i class="icon-plus"></i></a></div>-->

  121. 		<div id="chart"></div>

  122. 		<div id="workspace-toolbar">

  123. 			<div class="btn-group">

  124. 				<a class="btn btn-small" href="#"><i class="icon-zoom-out"></i></a>

  125. 				<a class="btn btn-small" href="#"><i class="icon-th"></i></a>

  126. 				<a class="btn btn-small" href="#"><i class="icon-zoom-in"></i></a>

  127. 			</div>

  128. 		</div>

  129. 	</div>

  130. 

  131. 	<div id="chart-zoom-controls">

  132. 		<div class="btn-group">

  133. 			<a class="btn btn-mini" id="btn-zoom-out" href="#"><i class="icon-zoom-out"></i></a>

  134. 			<a class="btn btn-mini" id="btn-zoom-zero" href="#"><i class="icon-th"></i></a>

  135. 			<a class="btn btn-mini" id="btn-zoom-in" href="#"><i class="icon-zoom-in"></i></a>

  136. 		</div>

  137. 	</div>

  138. 

  139. 	<div id="sidebar">

  140. 		<ul id="sidebar-tabs"></ul>

  141. 		<div id="sidebar-content"></div>

  142. 	</div>

  143. 

  144. 	<div id="sidebar-separator"></div>

  145. 

  146. </div>

  147. 

  148. <div id="notifications"></div>

  149. <div id="dropTarget"><div>Drop the flow here</div></div>

  150. 

  151. <div id="dialog" class="hide"><form id="dialog-form" class="form-horizontal"></form></div>

  152. <div id="node-config-dialog" class="hide"><form id="dialog-config-form" class="form-horizontal"></form><div class="form-tips" id="node-config-dialog-user-count"></div></div>

  153. 

  154. <div id="node-dialog-confirm-deploy" class="hide">

  155. 	<form class="form-horizontal">

  156. 		<div id="node-dialog-confirm-deploy-config" style="text-align: center; padding-top: 30px;">

  157. 			Some of the nodes are not properly configured. Are you sure you want to deploy?

  158. 		</div>

  159. 		<div id="node-dialog-confirm-deploy-unknown" style="text-align: center; padding-top: 10px;">

  160. 			The workspace contains some unknown node types:

  161. 			<ul style="width: 300px; margin: auto; text-align: left;" id="node-dialog-confirm-deploy-unknown-list"></ul>

  162. 			Are you sure you want to deploy?

  163. 		</div>

  164. 	</form>

  165. </div>

  166. 

  167. <div id="node-dialog-error-deploy" class="hide">

  168. 	<form class="form-horizontal">

  169. 		<div id="node-dialog-error-deploy-noio" style="text-align: center; padding-top: 10px;">

  170. 			<p>The workspace contains no input/output nodes!</p>

  171. 			<p>You need an input or an output to export the data!</p>

  172. 			<p>Without such a input/output function the exported

  173. 			code will not run properly!</p>

  174. 		</div>

  175. 	</form>

  176. </div>

  177. 

  178. <div id="node-help" class="modal hide fade" tabindex="-1" role="dialog" aria-labelledby="node-help-label" aria-hidden="true">

  179.   <div class="modal-header">

  180. 	<h5 id="node-help-label">Keyboard Shortcuts <span style="float: right;"><a href="http://node-red.github.io/docs" target="_blank">Open help in new window &raquo;</a></span></h5>

  181.   </div>

  182.   <div class="modal-body">

  183. 	<table>

  184. 		<tr>

  185. 		  <td><span class="help-key">?</span></td><td>Help</td>

  186. 		  <td><span class="help-key">Ctrl</span> <span class="help-key">a</span></td><td>Select all nodes</td>

  187. 		</tr>

  188. 		<tr>

  189. 		  <td><span class="help-key">Ctrl</span> <span class="help-key">Space</span></td><td>Toggle sidebar</td>

  190. 		  <td><span class="help-key">Shift</span> <span class="help-key">Click</span></td><td>Select all connected nodes</td>

  191. 		</tr>

  192. 		<tr>

  193. 		  <td><span class="help-key">Ctrl</span> <span class="help-key">z</span></td><td>Undo</td>

  194. 		  <td><span class="help-key">Ctrl</span> <span class="help-key">Click</span></td><td>Add/remove node from selection</td>

  195. 		</tr>

  196. 		<tr>

  197. 		  <td></td><td></td>

  198. 		  <td><span class="help-key">Delete</span></td><td>Delete selected nodes or link</td>

  199. 		</tr>

  200. 		<tr>

  201. 		  <td><span class="help-key">Ctrl</span> <span class="help-key">x</span></td><td>Cut selected nodes</td>

  202. 		  <td></td><td></td>

  203. 		</tr>

  204. 		<tr>

  205. 		  <td><span class="help-key">Ctrl</span> <span class="help-key">c</span></td><td>Copy selected nodes</td>

  206. 		  <td><span class="help-key">Ctrl</span> <span class="help-key">v</span></td><td>Paste nodes</td>

  207. 		</tr>

  208. 		<tr>

  209. 		  <td><span class="help-key">Ctrl</span> <span class="help-key">i</span></td><td>Import nodes</td>

  210. 		  <td><span class="help-key">Ctrl</span> <span class="help-key">e</span></td><td>Export selected nodes</td>

  211. 		</tr>

  212. 		<tr>

  213. 		  <td colspan="2"></td>

  214. 		</tr>

  215. 		<tr>

  216. 		  <td><span class="help-key">Ctrl</span> <span class="help-key">+</span></td><td>Zoom in</td>

  217. 		  <td><span class="help-key">Ctrl</span> <span class="help-key">-</span></td><td>Zoom out</td>

  218. 		</tr>

  219. 	</table>

  220.   </div>

  221.   <div class="modal-footer">

  222. 	<button class="btn" data-dismiss="modal" aria-hidden="true">Close</button>

  223.   </div>

  224. </div>

  225. 

  226. <div id="node-dialog-library-save-confirm" class="hide">

  227. 	<form class="form-horizontal">

  228. 		<div style="text-align: center; padding-top: 30px;">

  229. 		 A <span id="node-dialog-library-save-type"></span> called <span id="node-dialog-library-save-name"></span> already exists. Overwrite?

  230. 		</div>

  231. 	</form>

  232. </div>

  233. 

  234. <div id="node-dialog-library-save" class="hide">

  235. 	<form class="form-horizontal">

  236. 		<div class="form-row">

  237. 			<label for="node-dialog-library-save-folder"><i class="icon-folder-open"></i> Folder</label>

  238. 			<input type="text" id="node-dialog-library-save-folder" placeholder="Folder">

  239. 		</div>

  240. 		<div class="form-row">

  241. 			<label for="node-dialog-library-save-filename"><i class="icon-file"></i> Filename</label>

  242. 			<input type="text" id="node-dialog-library-save-filename" placeholder="Filename">

  243. 		</div>

  244. 	</form>

  245. </div>

  246. 

  247. <div id="node-dialog-library-lookup" class="hide">

  248. 	<form class="form-horizontal">

  249. 		<div class="form-row">

  250. 			<ul id="node-dialog-library-breadcrumbs" class="breadcrumb">

  251. 				<li class="active"><a href="#">Library</a></li>

  252. 			</ul>

  253. 		</div>

  254. 		<div class="form-row">

  255. 			<div style="vertical-align: top; display: inline-block; height: 100%; width: 30%; padding-right: 20px;">

  256. 				<div id="node-select-library" style="border: 1px solid #999; width: 100%; height: 100%; overflow:scroll;"><ul></ul></div>

  257. 			</div>

  258. 			<div style="vertical-align: top; display: inline-block;width: 65%; height: 100%;">

  259. 				<div style="height: 100%; width: 95%;" class="node-text-editor" id="node-select-library-text" ></div>

  260. 			</div>

  261. 		</div>

  262. 	</form>

  263. </div>

  264. <div id="node-dialog-rename-workspace" class="hide">

  265. 	<form class="form-horizontal">

  266. 		<div class="form-row">

  267. 			<label for="node-input-workspace-name" ><i class="icon-tag"></i> Name:</label>

  268. 			<input type="text" id="node-input-workspace-name">

  269. 		</div>

  270. 	</form>

  271. </div>

  272. <div id="node-dialog-delete-workspace" class="hide">

  273. 	<form class="form-horizontal">

  274. 		<div style="text-align: center; padding-top: 30px;">

  275. 		 Are you sure you want to delete '<span id="node-dialog-delete-workspace-name"></span>'?

  276. 		</div>

  277. 	</form>

  278. </div>

  279. 

  280. <script type="text/x-red" data-template-name="export-clipboard-dialog">

  281. 	<div class="form-row">

  282. 		<label for="node-input-export" style="display: block; width:100%;"><i class="icon-share"></i> Source Code:</label>

  283. 		<textarea readonly style="font-family: monospace; font-size: 12px; background:rgb(226, 229, 255); padding-left: 0.5em;" class="input-block-level" id="node-input-export" rows="12"></textarea>

  284. 	</div>

  285. 	<div class="form-tips">

  286. 		Select the text above and copy to the clipboard with Ctrl-A Ctrl-C.

  287. 	</div>

  288. </script>

  289. <script type="text/x-red" data-template-name="export-library-dialog">

  290. 	<div class="form-row">

  291. 		<label for="node-input-filename" ><i class="icon-tag"></i> Filename:</label>

  292. 		<input type="text" id="node-input-filename" placeholder="Filename">

  293. 	</div>

  294. </script>

  295. <script type="text/x-red" data-template-name="import-dialog">

  296. 	<div class="form-row">

  297. 		<label for="node-input-import"><i class="icon-share"></i>Nodes:</label>

  298. 		<textarea style="font-family: monospace; font-size: 12px; background:rgb(226, 229, 255); padding-left: 0.5em;" class="input-block-level" id="node-input-import" rows="5" placeholder="Paste nodes here, or lookup in the library. When importing Arduino code, the whole flow will be replaced."></textarea>

  299. 	</div>

  300. 	<div class="form-tips">

  301. 		<label for="node-input-arduino" style="font-size: 13px; padding: 2px 0px 0px 4px;">

  302. 			<input style="margin-bottom: 4px; margin-right: 4px;" type="checkbox" id="node-input-arduino" checked="checked" class="input-block-level" />

  303. 				&nbsp;Import copied code from the Arduino IDE

  304. 		</label>

  305. 	</div>

  306. </script>

  307. 

  308. <script src="jquery/js/jquery-1.9.1.js"></script>

  309. <script src="bootstrap/js/bootstrap.min.js"></script>

  310. <script src="jquery/js/jquery-ui-1.10.3.custom.min.js"></script>

  311. <script src="jquery/js/jquery.ui.touch-punch.min.js"></script>

  312. <script src="orion/built-editor.min.js"></script>

  313. <script src="red/d3/d3.v3.min.js"></script>

  314. <script src="red/main.js"></script>

  315. <script src="red/ui/state.js"></script>

  316. <script src="red/nodes.js"></script>

  317. <script src="red/storage.js"></script>

  318. <script src="red/history.js"></script>

  319. <script src="red/ui/keyboard.js"></script>

  320. <script src="red/ui/tabs.js"></script>

  321. <script src="red/ui/view.js"></script>

  322. <script src="red/ui/sidebar.js"></script>

  323. <script src="red/ui/palette.js"></script>

  324. <script src="red/ui/tab-info.js"></script>

  325. <script src="red/ui/tab-config.js"></script>

  326. <script src="red/ui/editor.js"></script>

  327. <script src="red/ui/library.js"></script>

  328. <script src="red/ui/notifications.js"></script>

  329. <script src="red/ui/touch/radialMenu.js"></script>

  330. 

  331. <!--

  332.  TODO: generate some or all of this automatically from the C++ source

  333. -->

  334. 

  335. <!--

  336.  TODO: add a field for maximum instance count

  337. -->

  338. <!--

  339.  TODO: add a field for exclusive to other objects (not allowed if they're used)

  340. -->

  341. <!--

  342.  TODO: add "parameters" fields, to replace the form html stuff

  343. -->

  344. 

  345. <script  type="text/x-red" data-container-name="NodeDefinitions">

  346. 	{"nodes":[

  347. 		{"type":"AudioInputI2S","data":{"defaults":{"name":{"value":"new"}},"shortName":"i2s","inputs":0,"outputs":2,"category":"input-function","color":"#E6E0F8","icon":"arrow-in.png"}},

  348. 		{"type":"AudioInputI2SQuad","data":{"defaults":{"name":{"value":"new"}},"shortName":"i2s_quad","inputs":0,"outputs":4,"category":"input-function","color":"#E6E0F8","icon":"arrow-in.png"}},

  349. 		{"type":"AudioInputAnalog","data":{"defaults":{"name":{"value":"new"}},"shortName":"adc","inputs":0,"outputs":1,"category":"input-function","color":"#E6E0F8","icon":"arrow-in.png"}},

  350. 		{"type":"AudioInputI2Sslave","data":{"defaults":{"name":{"value":"new"}},"shortName":"i2sslave","inputs":0,"outputs":2,"category":"input-function","color":"#E6E0F8","icon":"arrow-in.png"}},

  351. 		{"type":"AudioInputUSB","data":{"defaults":{"name":{"value":"new"}},"shortName":"usb","inputs":0,"outputs":2,"category":"input-function","color":"#E6E0F8","icon":"arrow-in.png"}},

  352. 		{"type":"AudioOutputI2S","data":{"defaults":{"name":{"value":"new"}},"shortName":"i2s","inputs":2,"outputs":0,"category":"output-function","color":"#E6E0F8","icon":"arrow-in.png"}},

  353. 		{"type":"AudioOutputI2SQuad","data":{"defaults":{"name":{"value":"new"}},"shortName":"i2s_quad","inputs":4,"outputs":0,"category":"output-function","color":"#E6E0F8","icon":"arrow-in.png"}},

  354. 		{"type":"AudioOutputSPDIF","data":{"defaults":{"name":{"value":"new"}},"shortName":"spdif","inputs":2,"outputs":0,"category":"output-function","color":"#E6E0F8","icon":"arrow-in.png"}},

  355. 		{"type":"AudioOutputPT8211","data":{"defaults":{"name":{"value":"new"}},"shortName":"pt2811","inputs":2,"outputs":0,"category":"output-function","color":"#E6E0F8","icon":"arrow-in.png"}},

  356. 		{"type":"AudioOutputAnalog","data":{"defaults":{"name":{"value":"new"}},"shortName":"dac","inputs":1,"outputs":0,"category":"output-function","color":"#E6E0F8","icon":"arrow-in.png"}},

  357. 		{"type":"AudioOutputPWM","data":{"defaults":{"name":{"value":"new"}},"shortName":"pwm","inputs":1,"outputs":0,"category":"output-function","color":"#E6E0F8","icon":"arrow-in.png"}},

  358. 		{"type":"AudioOutputI2Sslave","data":{"defaults":{"name":{"value":"new"}},"shortName":"i2sslave","inputs":2,"outputs":0,"category":"output-function","color":"#E6E0F8","icon":"arrow-in.png"}},

  359. 		{"type":"AudioOutputUSB","data":{"defaults":{"name":{"value":"new"}},"shortName":"usb","inputs":2,"outputs":0,"category":"output-function","color":"#E6E0F8","icon":"arrow-in.png"}},

  360. 		{"type":"AudioMixer4","data":{"defaults":{"name":{"value":"new"}},"shortName":"mixer","inputs":4,"outputs":1,"category":"mixer-function","color":"#E6E0F8","icon":"arrow-in.png"}},

  361. 		{"type":"AudioPlayMemory","data":{"defaults":{"name":{"value":"new"}},"shortName":"playMem","inputs":0,"outputs":1,"category":"play-function","color":"#E6E0F8","icon":"arrow-in.png"}},

  362. 		{"type":"AudioPlaySdWav","data":{"defaults":{"name":{"value":"new"}},"shortName":"playSdWav","inputs":0,"outputs":2,"category":"play-function","color":"#E6E0F8","icon":"arrow-in.png"}},

  363. 		{"type":"AudioPlaySdRaw","data":{"defaults":{"name":{"value":"new"}},"shortName":"playSdRaw","inputs":0,"outputs":1,"category":"play-function","color":"#E6E0F8","icon":"arrow-in.png"}},

  364. 		{"type":"AudioPlaySerialflashRaw","data":{"defaults":{"name":{"value":"new"}},"shortName":"playFlashRaw","inputs":0,"outputs":1,"category":"play-function","color":"#E6E0F8","icon":"arrow-in.png"}},

  365. 		{"type":"AudioPlayQueue","data":{"defaults":{"name":{"value":"new"}},"shortName":"queue","inputs":0,"outputs":1,"category":"play-function","color":"#E6E0F8","icon":"arrow-in.png"}},

  366. 		{"type":"AudioRecordQueue","data":{"defaults":{"name":{"value":"new"}},"shortName":"queue","inputs":1,"outputs":0,"category":"record-function","color":"#E6E0F8","icon":"arrow-in.png"}},

  367. 		{"type":"AudioSynthSimpleDrum","data":{"defaults":{"name":{"value":"new"}},"shortName":"drum","inputs":0,"outputs":1,"category":"synth-function","color":"#E6E0F8","icon":"arrow-in.png"}},

  368. 		{"type":"AudioSynthKarplusStrong","data":{"defaults":{"name":{"value":"new"}},"shortName":"string","inputs":0,"outputs":1,"category":"synth-function","color":"#E6E0F8","icon":"arrow-in.png"}},

  369. 		{"type":"AudioSynthWaveformSine","data":{"defaults":{"name":{"value":"new"}},"shortName":"sine","inputs":0,"outputs":1,"category":"synth-function","color":"#E6E0F8","icon":"arrow-in.png"}},

  370. 		{"type":"AudioSynthWaveformSineHires","data":{"defaults":{"name":{"value":"new"}},"shortName":"sine_hires","inputs":0,"outputs":2,"category":"synth-function","color":"#E6E0F8","icon":"arrow-in.png"}},

  371. 		{"type":"AudioSynthWaveformSineModulated","data":{"defaults":{"name":{"value":"new"}},"shortName":"sine_fm","inputs":1,"outputs":1,"category":"synth-function","color":"#E6E0F8","icon":"arrow-in.png"}},

  372. 		{"type":"AudioSynthWaveform","data":{"defaults":{"name":{"value":"new"}},"shortName":"waveform","inputs":0,"outputs":1,"category":"synth-function","color":"#E6E0F8","icon":"arrow-in.png"}},

  373. 		{"type":"AudioSynthToneSweep","data":{"defaults":{"name":{"value":"new"}},"shortName":"tonesweep","inputs":0,"outputs":1,"category":"synth-function","color":"#E6E0F8","icon":"arrow-in.png"}},

  374. 		{"type":"AudioSynthWaveformDc","data":{"defaults":{"name":{"value":"new"}},"shortName":"dc","inputs":0,"outputs":1,"category":"synth-function","color":"#E6E0F8","icon":"arrow-in.png"}},

  375. 		{"type":"AudioSynthNoiseWhite","data":{"defaults":{"name":{"value":"new"}},"shortName":"noise","inputs":0,"outputs":1,"category":"synth-function","color":"#E6E0F8","icon":"arrow-in.png"}},

  376. 		{"type":"AudioSynthNoisePink","data":{"defaults":{"name":{"value":"new"}},"shortName":"pink","inputs":0,"outputs":1,"category":"synth-function","color":"#E6E0F8","icon":"arrow-in.png"}},

  377. 		{"type":"AudioEffectFade","data":{"defaults":{"name":{"value":"new"}},"shortName":"fade","inputs":1,"outputs":1,"category":"effect-function","color":"#E6E0F8","icon":"arrow-in.png"}},

  378. 		{"type":"AudioEffectChorus","data":{"defaults":{"name":{"value":"new"}},"shortName":"chorus","inputs":1,"outputs":1,"category":"effect-function","color":"#E6E0F8","icon":"arrow-in.png"}},

  379. 		{"type":"AudioEffectFlange","data":{"defaults":{"name":{"value":"new"}},"shortName":"flange","inputs":1,"outputs":1,"category":"effect-function","color":"#E6E0F8","icon":"arrow-in.png"}},

  380. 		{"type":"AudioEffectEnvelope","data":{"defaults":{"name":{"value":"new"}},"shortName":"envelope","inputs":1,"outputs":1,"category":"effect-function","color":"#E6E0F8","icon":"arrow-in.png"}},

  381. 		{"type":"AudioEffectMultiply","data":{"defaults":{"name":{"value":"new"}},"shortName":"multiply","inputs":2,"outputs":1,"category":"effect-function","color":"#E6E0F8","icon":"arrow-in.png"}},

  382. 		{"type":"AudioEffectDelay","data":{"defaults":{"name":{"value":"new"}},"shortName":"delay","inputs":1,"outputs":8,"category":"effect-function","color":"#E6E0F8","icon":"arrow-in.png"}},

  383. 		{"type":"AudioEffectDelayExternal","data":{"defaults":{"name":{"value":"new"}},"shortName":"delayExt","inputs":1,"outputs":8,"category":"effect-function","color":"#E6E0F8","icon":"arrow-in.png"}},

  384. 		{"type":"AudioEffectBitcrusher","data":{"shortName":"bitcrusher","inputs":1,"outputs":1,"category":"effect-function","color":"#E6E0F8","icon":"arrow-in.png"}},

  385. 		{"type":"AudioEffectMidSide","data":{"shortName":"midside","inputs":2,"outputs":2,"category":"effect-function","color":"#E6E0F8","icon":"arrow-in.png"}},

  386. 		{"type":"AudioFilterBiquad","data":{"defaults":{"name":{"value":"new"}},"shortName":"biquad","inputs":1,"outputs":1,"category":"filter-function","color":"#E6E0F8","icon":"arrow-in.png"}},

  387. 		{"type":"AudioFilterFIR","data":{"defaults":{"name":{"value":"new"}},"shortName":"fir","inputs":1,"outputs":1,"category":"filter-function","color":"#E6E0F8","icon":"arrow-in.png"}},

  388. 		{"type":"AudioFilterStateVariable","data":{"defaults":{"name":{"value":"new"}},"shortName":"filter","inputs":2,"outputs":3,"category":"filter-function","color":"#E6E0F8","icon":"arrow-in.png"}},

  389. 		{"type":"AudioAnalyzePeak","data":{"defaults":{"name":{"value":"new"}},"shortName":"peak","inputs":1,"outputs":0,"category":"analyze-function","color":"#E6E0F8","icon":"arrow-in.png"}},

  390. 		{"type":"AudioAnalyzeRMS","data":{"defaults":{"name":{"value":"new"}},"shortName":"rms","inputs":1,"outputs":0,"category":"analyze-function","color":"#E6E0F8","icon":"arrow-in.png"}},

  391. 		{"type":"AudioAnalyzeFFT256","data":{"defaults":{"name":{"value":"new"}},"shortName":"fft256","inputs":1,"outputs":0,"category":"analyze-function","color":"#E6E0F8","icon":"arrow-in.png"}},

  392. 		{"type":"AudioAnalyzeFFT1024","data":{"defaults":{"name":{"value":"new"}},"shortName":"fft1024","inputs":1,"outputs":0,"category":"analyze-function","color":"#E6E0F8","icon":"arrow-in.png"}},

  393. 		{"type":"AudioAnalyzeToneDetect","data":{"defaults":{"name":{"value":"new"}},"shortName":"tone","inputs":1,"outputs":0,"category":"analyze-function","color":"#E6E0F8","icon":"arrow-in.png"}},

  394. 		{"type":"AudioAnalyzeNoteFrequency","data":{"defaults":{"name":{"value":"new"}},"shortName":"notefreq","inputs":1,"outputs":0,"category":"analyze-function","color":"#E6E0F8","icon":"arrow-in.png"}},

  395. 		{"type":"AudioAnalyzePrint","data":{"defaults":{"name":{"value":"new"}},"shortName":"print","inputs":1,"outputs":0,"category":"analyze-function","color":"#E6E0F8","icon":"arrow-in.png"}},

  396. 		{"type":"AudioControlSGTL5000","data":{"defaults":{"name":{"value":"new"}},"shortName":"sgtl5000","inputs":0,"outputs":0,"category":"control-function","color":"#E6E0F8","icon":"arrow-in.png"}},

  397. 		{"type":"AudioControlAK4558","data":{"defaults":{"name":{"value":"new"}},"shortName":"ak4558","inputs":0,"outputs":0,"category":"control-function","color":"#E6E0F8","icon":"arrow-in.png"}},

  398. 		{"type":"AudioControlCS4272","data":{"defaults":{"name":{"value":"new"}},"shortName":"cs4272","inputs":0,"outputs":0,"category":"control-function","color":"#E6E0F8","icon":"arrow-in.png"}},

  399. 		{"type":"AudioControlWM8731","data":{"defaults":{"name":{"value":"new"}},"shortName":"wm8731","inputs":0,"outputs":0,"category":"control-function","color":"#E6E0F8","icon":"arrow-in.png"}},

  400. 		{"type":"AudioControlWM8731master","data":{"defaults":{"name":{"value":"new"}},"shortName":"wm8731m","inputs":0,"outputs":0,"category":"control-function","color":"#E6E0F8","icon":"arrow-in.png"}}

  401. 	]}

  402. </script>

  403. 

  404. <script type="text/x-red" data-help-name="AudioInputI2S">

  405. 	<h3>Summary</h3>

  406. 	<div class=tooltipinfo>

  407. 	<p>Receive 16 bit stereo audio from the

  408. 	<a href="http://www.pjrc.com/store/teensy3_audio.html" target="_blank">audio shield</a>

  409. 		or another I2S device, using I2S master mode.</p>

  410. 	<p align=center><img src="img/audioshield_inputs.jpg"></p>

  411. 	</div>

  412. 	<h3>Audio Connections</h3>

  413. 	<table class=doc align=center cellpadding=3>

  414. 		<tr class=top><th>Port</th><th>Purpose</th></tr>

  415. 		<tr class=odd><td align=center>Out 0</td><td>Left Channel</td></tr>

  416. 		<tr class=odd><td align=center>Out 1</td><td>Right Channel</td></tr>

  417. 	</table>

  418. 	<h3>Functions</h3>

  419. 	<p>This object has no functions to call from the Arduino sketch.  It

  420. 		simply streams data from the I2S hardware to its 2 output ports.</p>

  421. 	<h3>Hardware</h3>

  422. 	<p align=center><img src="img/audioshield_backside.jpg"></p>

  423. 	<p>The I2S signals are used in "master" mode, where Teensy creates

  424. 		all 3 clock signals and controls all data timing.</p>

  425. 	<table class=doc align=center cellpadding=3>

  426. 		<tr class=top><th>Pin</th><th>Signal</th><th>Direction</th></tr>

  427. 		<tr class=odd><td align=center>9</td><td>BCLK</td><td>Output</td></tr>

  428. 		<tr class=odd><td align=center>11</td><td>MCLK</td><td>Output</td></tr>

  429. 		<tr class=odd><td align=center>13</td><td>RX</td><td>Input</td></tr>

  430. 		<tr class=odd><td align=center>23</td><td>LRCLK</td><td>Output</td></tr>

  431. 	</table>

  432. 	<p>Audio from

  433. 		master mode I2S may be used in the same project as ADC, DAC and

  434. 		PWM signals, because all remain in sync to Teensy's timing</p>

  435. 	<h3>Examples</h3>

  436. 	<p class=exam>File &gt; Examples &gt; Audio &gt; HardwareTesting &gt; PassThroughStereo

  437. 	</p>

  438. 	<p class=exam>File &gt; Examples &gt; Audio &gt; Recorder

  439. 	</p>

  440. 	<p class=exam>File &gt; Examples &gt; Audio &gt; Analysis &gt; PeakMeterStereo

  441. 	</p>

  442. 	<p class=exam>File &gt; Examples &gt; Audio &gt; Analysis &gt; FFT

  443. 	</p>

  444. 	<p class=exam>File &gt; Examples &gt; Audio &gt; Analysis &gt; SpectrumAnalyzerBasic

  445. 	</p>

  446. 	<p class=exam>File &gt; Examples &gt; Audio &gt; Effects &gt; Chorus

  447. 	</p>

  448. 	<p class=exam>File &gt; Examples &gt; Audio &gt; Effects &gt; Flange

  449. 	</p>

  450. 	<p class=exam>File &gt; Examples &gt; Audio &gt; Effects &gt; Filter

  451. 	</p>

  452. 	<p class=exam>File &gt; Examples &gt; Audio &gt; Effects &gt; Filter_FIR

  453. 	</p>

  454. 	<h3>Notes</h3>

  455. 	<p>Normally, this object is used with the Audio Shield, which

  456. 		is controlled separately by the "sgtl5000" object.</p>

  457. 	<p>Only one I2S input and one I2S output object may be used.  Master

  458. 		and slave modes may not be mixed (both must be of the same type).

  459. 	</p>

  460. 	<p>I2S master objects can be used together with non-I2S input and output

  461. 		objects, for simultaneous audio streaming on different hardware.</p>

  462. </script>

  463. <script type="text/x-red" data-template-name="AudioInputI2S">

  464. 	<div class="form-row">

  465. 		<label for="node-input-name"><i class="fa fa-tag"></i> Name</label>

  466. 		<input type="text" id="node-input-name" placeholder="Name">

  467. 	</div>

  468. </script>

  469. 

  470. <script type="text/x-red" data-help-name="AudioInputI2SQuad">

  471. 	<h3>Summary</h3>

  472. 	<div class=tooltipinfo>

  473. 	<p>Receive 16 bit quad (4) channel audio from two

  474. 	<a href="http://www.pjrc.com/store/teensy3_audio.html" target="_blank">audio shields</a>

  475. 		or another I2S devices, using I2S master mode.</p>

  476. 	<p align=center><img src="img/audioshield_quad_in.jpg"></p>

  477. 	</div>

  478. 	<h3>Audio Connections</h3>

  479. 	<table class=doc align=center cellpadding=3>

  480. 		<tr class=top><th>Port</th><th>Purpose</th></tr>

  481. 		<tr class=odd><td align=center>Out 0</td><td>Channel #1</td></tr>

  482. 		<tr class=odd><td align=center>Out 1</td><td>Channel #2</td></tr>

  483. 		<tr class=odd><td align=center>Out 2</td><td>Channel #3</td></tr>

  484. 		<tr class=odd><td align=center>Out 3</td><td>Channel #4</td></tr>

  485. 	</table>

  486. 	<h3>Functions</h3>

  487. 	<p>This object has no functions to call from the Arduino sketch.  It

  488. 		simply streams data from the I2S hardware to its 4 output ports.</p>

  489. 	<h3>Hardware</h3>

  490. 	<p>See this Sparkfun blog for <a href="https://www.sparkfun.com/news/2055" target="_blank">how

  491. 		to connect two audio adaptors for 4 channel audio</a>.

  492. 	<p>The I2S signals are used in "master" mode, where Teensy creates

  493. 		all 3 clock signals and controls all data timing.</p>

  494. 	<table class=doc align=center cellpadding=3>

  495. 		<tr class=top><th>Pin</th><th>Signal</th><th>Direction</th></tr>

  496. 		<tr class=odd><td align=center>9</td><td>BCLK</td><td>Output</td></tr>

  497. 		<tr class=odd><td align=center>11</td><td>MCLK</td><td>Output</td></tr>

  498. 		<tr class=odd><td align=center>13</td><td>RX</td><td>Input</td></tr>

  499. 		<tr class=odd><td align=center>30</td><td>RX</td><td>Input</td></tr>

  500. 		<tr class=odd><td align=center>23</td><td>LRCLK</td><td>Output</td></tr>

  501. 	</table>

  502. 	<p>Audio from

  503. 		master mode I2S may be used in the same project as ADC, DAC and

  504. 		PWM signals, because all remain in sync to Teensy's timing</p>

  505. 	<h3>Examples</h3>

  506. 	<p class=exam>File &gt; Examples &gt; Audio &gt; HardwareTesting &gt; PassThroughQuad

  507. 	</p>

  508. 	<h3>Notes</h3>

  509. 	<p>Normally, this object is used with two Audio Shield, which

  510. 		are controlled separately by a pair "sgtl5000" object.</p>

  511. </script>

  512. <script type="text/x-red" data-template-name="AudioInputI2SQuad">

  513. 	<div class="form-row">

  514. 		<label for="node-input-name"><i class="fa fa-tag"></i> Name</label>

  515. 		<input type="text" id="node-input-name" placeholder="Name">

  516. 	</div>

  517. </script>

  518. 

  519. <script type="text/x-red" data-help-name="AudioInputAnalog">

  520. 	<h3>Summary</h3>

  521. 	<div class=tooltipinfo>

  522. 	<p>Receive audio using the built-in analog to digital converter.</p>

  523. 	</div>

  524. 	<h3>Audio Connections</h3>

  525. 	<table class=doc align=center cellpadding=3>

  526. 		<tr class=top><th>Port</th><th>Purpose</th></tr>

  527. 		<tr class=odd><td align=center>Out 0</td><td>Audio Channel</td></tr>

  528. 	</table>

  529. 	<h3>Functions</h3>

  530. 	<p>This object has no functions to call from the Arduino sketch.  It

  531. 		simply streams data from the ADC to its output port.</p>

  532. 	<h3>Hardware</h3>

  533. 	<p>Pin A2 is used for audio input.  This circuitry is recommended.</p>

  534. 	<p align=center><img src="img/adccircuit.png"></p>

  535. 	<p>Signal range is 0 to 1.2V</p>

  536. 	<h3>Examples</h3>

  537. 	<p class=exam>File &gt; Examples &gt; Audio &gt; HardwareTesting &gt; PassThroughMono

  538. 	</p>

  539. 	<p class=exam>File &gt; Examples &gt; Audio &gt; Analysis &gt; PeakMeterMono

  540. 	</p>

  541. 	<p class=exam>File &gt; Examples &gt; Audio &gt; Analysis &gt; DialTone_7segment

  542. 	</p>

  543. 	<p class=exam>File &gt; Examples &gt; OctoWS2811 &gt; SpectrumAnalyzer

  544. 	</p>

  545. 	<h3>Notes</h3>

  546. 	<p><b>analogRead() must not be used</b>, because AudioInputAnalog is regularly

  547. 		accessing the ADC hardware.  If both access the hardware at the same

  548. 		moment, analogRead() can end up waiting forever, which effectively

  549. 		crashes your program.

  550. 	</p>

  551. 	<p>AudioInputAnalog has a

  552. 		<a href="https://github.com/PaulStoffregen/Audio/issues/96">known bug</a>

  553. 		at 72 MHz.  Use 48 or 96 MHz clock speed (Tools &gt; CPU Speed menu).

  554. 	</p>

  555. 	<p>A different pin may be used, but adding it as an parameter

  556. 		to the AudioInputAnalog object definition.

  557. 	</p>

  558. 	<p>For example, to use pin A3:

  559. 	</p>

  560. 	<p class=desc><span class=keyword>AudioInputAnalog</span>  adc1(<span class=literal>A3</span>);

  561. 	</p>

  562. 

  563. 	<p>Noise due to high source impedance, which allows rapidly switching digital signals

  564. 		to capacitively couple... avoiding higher analog impedance is the solution.</p>

  565. 	<p>Power Supply rejection issue with simple DC bias (bigger capacitor may be needed if 3.3V has low frequency noise)</p>

  566. 	<p>Algorithm for automatic DC bias tracking</p>

  567. 	<p>TODO: actual noise measurements with different input circuitry

  568. 		(it's not as quiet as the audio shield)</p>

  569. </script>

  570. <script type="text/x-red" data-template-name="AudioInputAnalog">

  571. 	<div class="form-row">

  572. 		<label for="node-input-name"><i class="fa fa-tag"></i> Name</label>

  573. 		<input type="text" id="node-input-name" placeholder="Name">

  574. 	</div>

  575. </script>

  576. 

  577. <script type="text/x-red" data-help-name="AudioInputI2Sslave">

  578. 	<h3>Summary</h3>

  579. 	<div class=tooltipinfo>

  580. 	<p>Receive 16 bit stereo audio from an I2S device using I2S slave mode

  581. 		(where the ADC or codec chip, not Teensy, controls audio timing).</p>

  582. 	</div>

  583. 	<h3>Audio Connections</h3>

  584. 	<table class=doc align=center cellpadding=3>

  585. 		<tr class=top><th>Port</th><th>Purpose</th></tr>

  586. 		<tr class=odd><td align=center>Out 0</td><td>Left Channel</td></tr>

  587. 		<tr class=odd><td align=center>Out 1</td><td>Right Channel</td></tr>

  588. 	</table>

  589. 	<h3>Functions</h3>

  590. 	<p>This object has no functions to call from the Arduino sketch.  It

  591. 		simply streams data from the I2S hardware to its 2 output ports.</p>

  592. 	<h3>Hardware</h3>

  593. 	<p>The I2S signals are used in "slave" mode, where the I2S device controls

  594. 		data timing.</p>

  595. 	<table class=doc align=center cellpadding=3>

  596. 		<tr class=top><th>Pin</th><th>Signal</th><th>Direction</th></tr>

  597. 		<tr class=odd><td align=center>9</td><td>BCLK</td><td>Input</td></tr>

  598. 		<tr class=odd><td align=center>13</td><td>RX</td><td>Input</td></tr>

  599. 		<tr class=odd><td align=center>23</td><td>LRCLK</td><td>Input</td></tr>

  600. 	</table>

  601. 	<!--

  602. <h3>Examples</h3>

  603. 	<p class=exam>File &gt; Examples &gt; Audio &gt;

  604. 	</p>

  605. -->

  606. 	<h3>Notes</h3>

  607. 	<p>Slave mode I2S <b>should not used in the same project as ADC, DAC and

  608. 		PWM</b> signals.  Differences in timing between the I2S device and

  609. 		Teensy's clock can cause occasional audio glitches when I2S slave mode

  610. 		is used together with other input or output objects based on Teensy's

  611. 		timing.</p>

  612. 	<p>Only one I2S input and one I2S output object may be used.  Master

  613. 		and slave modes may not be mixed (both must be of the same type).

  614. 	</p>

  615. </script>

  616. <script type="text/x-red" data-template-name="AudioInputI2Sslave">

  617. 	<div class="form-row">

  618. 		<label for="node-input-name"><i class="fa fa-tag"></i> Name</label>

  619. 		<input type="text" id="node-input-name" placeholder="Name">

  620. 	</div>

  621. </script>

  622. 

  623. <script type="text/x-red" data-help-name="AudioInputUSB">

  624. 	<h3>Summary</h3>

  625. 	<div class=tooltipinfo>

  626. 	<p>Receive stereo audio from a PC or Mac.  Teensy appears as a USB

  627. 		sound device.</p>

  628. 	<p align=center><img src="img/usbtype_audio_in.png"></p>

  629. 	</div>

  630. 	<h3>Audio Connections</h3>

  631. 	<table class=doc align=center cellpadding=3>

  632. 		<tr class=top><th>Port</th><th>Purpose</th></tr>

  633. 		<tr class=odd><td align=center>Out 0</td><td>Left Channel</td></tr>

  634. 		<tr class=odd><td align=center>Out 1</td><td>Right Channel</td></tr>

  635. 	</table>

  636. 	<h3>Functions</h3>

  637. 	<p>This object has no functions to call from the Arduino sketch.  It

  638. 		simply streams data from the USB to its 2 output ports.</p>

  639. 	<!--

  640. 	<h3>Hardware</h3>

  641. 	-->

  642. 	<h3>Examples</h3>

  643. 	<p class=exam>File &gt; Examples &gt; Audio &gt; HardwareTesting &gt; PassThroughUSB</p>

  644. 	</p>

  645. 	<h3>Notes</h3>

  646. 	<p>Arduino's <b>Tools &gt; USB Type</b> menu must be set to <b>Audio</b>.

  647. 		</p>

  648. 	<p align=center><img src="img/usbtype_audio.png"></p>

  649. 	<p>USB input &amp; output does not cause the Teensy Audio Library to

  650. 		update.  At least one non-USB input or output object must be

  651. 		present for the entire library to update properly.</p>

  652. </script>

  653. <script type="text/x-red" data-template-name="AudioInputUSB">

  654. 	<div class="form-row">

  655. 		<label for="node-input-name"><i class="fa fa-tag"></i> Name</label>

  656. 		<input type="text" id="node-input-name" placeholder="Name">

  657. 	</div>

  658. </script>

  659. 

  660. <script type="text/x-red" data-help-name="AudioOutputI2S">

  661. 	<h3>Summary</h3>

  662. 	<div class=tooltipinfo>

  663. 	<p>Transmit 16 bit stereo audio to the

  664. 	<a href="http://www.pjrc.com/store/teensy3_audio.html" target="_blank">audio shield</a>

  665. 		or another I2S device, using I2S master mode.</p>

  666. 	<p align=center><img src="img/audioshield_outputs.jpg"></p>

  667. 	</div>

  668. 	<h3>Audio Connections</h3>

  669. 	<table class=doc align=center cellpadding=3>

  670. 		<tr class=top><th>Port</th><th>Purpose</th></tr>

  671. 		<tr class=odd><td align=center>In 0</td><td>Left Channel</td></tr>

  672. 		<tr class=odd><td align=center>In 1</td><td>Right Channel</td></tr>

  673. 	</table>

  674. 	<h3>Functions</h3>

  675. 	<p>This object has no functions to call from the Arduino sketch.  It

  676. 		simply streams data from its 2 input ports to the I2S hardware.</p>

  677. 	<h3>Hardware</h3>

  678. 	<p align=center><img src="img/audioshield_backside.jpg"></p>

  679. 	<p>The I2S signals are used in "master" mode, where Teensy creates

  680. 		all 3 clock signals and controls all data timing.</p>

  681. 	<table class=doc align=center cellpadding=3>

  682. 		<tr class=top><th>Pin</th><th>Signal</th><th>Direction</th></tr>

  683. 		<tr class=odd><td align=center>9</td><td>BCLK</td><td>Output</td></tr>

  684. 		<tr class=odd><td align=center>11</td><td>MCLK</td><td>Output</td></tr>

  685. 		<tr class=odd><td align=center>22</td><td>TX</td><td>Output</td></tr>

  686. 		<tr class=odd><td align=center>23</td><td>LRCLK</td><td>Output</td></tr>

  687. 	</table>

  688. 	<p>Audio from

  689. 		master mode I2S may be used in the same project as ADC, DAC and

  690. 		PWM signals, because all remain in sync to Teensy's timing</p>

  691. 	<h3>Examples</h3>

  692. 	<p>Nearly all the examples use this object.  Here are some of the highlights:</p>

  693. 	<p class=exam>File &gt; Examples &gt; Audio &gt; HardwareTesting &gt; PassThroughStereo

  694. 	</p>

  695. 	<p class=exam>File &gt; Examples &gt; Audio &gt; SamplePlayer

  696. 	</p>

  697. 	<p class=exam>File &gt; Examples &gt; Audio &gt; Recorder

  698. 	</p>

  699. 	<p class=exam>File &gt; Examples &gt; Audio &gt; WavFilePlayer

  700. 	</p>

  701. 	<p class=exam>File &gt; Examples &gt; Audio &gt; Effects &gt; Chorus

  702. 	</p>

  703. 	<p class=exam>File &gt; Examples &gt; Audio &gt; Synthesis &gt; PlaySynthMusic

  704. 	</p>

  705. 	<h3>Notes</h3>

  706. 	<p>Normally, this object is used with the Audio Shield, which

  707. 		is controlled separately by the "sgtl5000" object.</p>

  708. 	<p>Only one I2S input and one I2S output object may be used.  Master

  709. 		and slave modes may not be mixed (both must be of the same type).

  710. 	</p>

  711. </script>

  712. <script type="text/x-red" data-template-name="AudioOutputI2S">

  713. 	<div class="form-row">

  714. 		<label for="node-input-name"><i class="fa fa-tag"></i> Name</label>

  715. 		<input type="text" id="node-input-name" placeholder="Name">

  716. 	</div>

  717. </script>

  718. 

  719. <script type="text/x-red" data-help-name="AudioOutputI2SQuad">

  720. 	<h3>Summary</h3>

  721. 	<div class=tooltipinfo>

  722. 	<p>Transmit quad (4) channel 16 bit audio, using I2S master mode.</p>

  723. 	<p align=center><img src="img/audioshield_quad_out.jpg"></p>

  724. 	</div>

  725. 	<h3>Audio Connections</h3>

  726. 	<table class=doc align=center cellpadding=3>

  727. 		<tr class=top><th>Port</th><th>Purpose</th></tr>

  728. 		<tr class=odd><td align=center>In 0</td><td>Channel #1</td></tr>

  729. 		<tr class=odd><td align=center>In 1</td><td>Channel #2</td></tr>

  730. 		<tr class=odd><td align=center>In 2</td><td>Channel #3</td></tr>

  731. 		<tr class=odd><td align=center>In 3</td><td>Channel #4</td></tr>

  732. 	</table>

  733. 	<h3>Functions</h3>

  734. 	<p>This object has no functions to call from the Arduino sketch.  It

  735. 		simply streams data from its 4 input ports to the I2S hardware.</p>

  736. 	<h3>Hardware</h3>

  737. 	<p>See this Sparkfun blog for <a href="https://www.sparkfun.com/news/2055" target="_blank">how

  738. 		to connect two audio adaptors for 4 channel audio</a>.  More

  739. 		<a href="https://forum.pjrc.com/threads/29373-Bit-bang-multiple-I2S-inputs-simultaneously?p=79606#post79606" target="_blank">details</a> are also available.

  740. 	<p>The I2S signals are used in "master" mode, where Teensy creates

  741. 		all 3 clock signals and controls all data timing.</p>

  742. 	<table class=doc align=center cellpadding=3>

  743. 		<tr class=top><th>Pin</th><th>Signal</th><th>Direction</th></tr>

  744. 		<tr class=odd><td align=center>9</td><td>BCLK</td><td>Output</td></tr>

  745. 		<tr class=odd><td align=center>11</td><td>MCLK</td><td>Output</td></tr>

  746. 		<tr class=odd><td align=center>22</td><td>TX (ch 1+2)</td><td>Output</td></tr>

  747. 		<tr class=odd><td align=center>15</td><td>TX (ch 3+4)</td><td>Output</td></tr>

  748. 		<tr class=odd><td align=center>23</td><td>LRCLK</td><td>Output</td></tr>

  749. 	</table>

  750. 	<p>Audio from

  751. 		master mode I2S may be used in the same project as ADC, DAC and

  752. 		PWM signals, because all remain in sync to Teensy's timing</p>

  753. 	<h3>Examples</h3>

  754. 	<p class=exam>File &gt; Examples &gt; Audio &gt; HardwareTesting &gt; PassThroughQuad

  755. 	</p>

  756. 	<p class=exam>File &gt; Examples &gt; Audio &gt; HardwareTesting &gt; SGTL5000 &gt; QuadChannelOutput

  757. 	</p>

  758. 	<h3>Notes</h3>

  759. 	<p>Normally, this object is used with two Audio Shields, which

  760. 		are controlled separately by a pair of "sgtl5000" objects.</p>

  761. </script>

  762. <script type="text/x-red" data-template-name="AudioOutputI2SQuad">

  763. 	<div class="form-row">

  764. 		<label for="node-input-name"><i class="fa fa-tag"></i> Name</label>

  765. 		<input type="text" id="node-input-name" placeholder="Name">

  766. 	</div>

  767. </script>

  768. 

  769. <script type="text/x-red" data-help-name="AudioOutputSPDIF">

  770. 	<h3>Summary</h3>

  771. 	<div class=tooltipinfo>

  772. 	<p>Transmit 16 bit stereo audio as Digital S/PDIF.</p>

  773. 	<p align=center><img src="img/spdif_proto.jpg"></p>

  774. 	</div>

  775. 	<h3>Audio Connections</h3>

  776. 	<table class=doc align=center cellpadding=3>

  777. 		<tr class=top><th>Port</th><th>Purpose</th></tr>

  778. 		<tr class=odd><td align=center>In 0</td><td>Left Channel</td></tr>

  779. 		<tr class=odd><td align=center>In 1</td><td>Right Channel</td></tr>

  780. 	</table>

  781. 	<h3>Functions</h3>

  782. 	<p>This object has no functions to call from the Arduino sketch.  It

  783. 		simply streams data from its 2 input ports S/PDIF encoded digital

  784. 		audio on pin 22.</p>

  785. 	<h3>Hardware</h3>

  786. 	<p>The S/PDIF output signal can be used to drive an optical TOSLINK

  787. 		cable, or a standard (usually orange) RCA jack.</p>

  788. 	<table class=doc align=center cellpadding=3>

  789. 		<tr class=top><th>Pin</th><th>Signal</th><th>Direction</th></tr>

  790. 		<tr class=odd><td align=center>22</td><td>S/PDIF</td><td>Output</td></tr>

  791. 	</table>

  792. 	<p>For optical TOSLINK output, this

  793. 		<a href="https://www.oshpark.com/shared_projects/KcDBKHta" target="_blank">OSH Park board</a>

  794. 		can be used with the inexpensive Everlight PLT133/T6A connector, available

  795. 		at Digikey, 1080-1434-ND.

  796. 		</p>

  797. 	<h3>Examples</h3>

  798. 	<p>The AudioOutputSPDIF object can be used in place of the AudioOutputI2S object,

  799. 	<p>used in nearly all the examples.  The WavFilePlayer shows how to substitute

  800. 		output objects for different hardware types.

  801. 	</p>

  802. 	<p class=exam>File &gt; Examples &gt; Audio &gt; WavFilePlayer

  803. 	</p>

  804. 	<h3>Credits</h3>

  805. 	<p><a href="https://github.com/FrankBoesing" target="_blank">Frank Boesing</a>

  806. 		developed the AudioOutputSPDIF code.  The original

  807. 		<a href="https://forum.pjrc.com/threads/28639-S-pdif" target="_blank">forum disussion</a>

  808. 		included valuable input and code from "kpc".

  809. 	<h3>Notes</h3>

  810. 	<p>S/PDIF output uses the I2S hardware.  This object can not be used

  811. 		together with any of the I2S objects, because it requires the I2S

  812. 		hardware with different internal settings.</p>

  813. 	</p>

  814. </script>

  815. <script type="text/x-red" data-template-name="AudioOutputSPDIF">

  816. 	<div class="form-row">

  817. 		<label for="node-input-name"><i class="fa fa-tag"></i> Name</label>

  818. 		<input type="text" id="node-input-name" placeholder="Name">

  819. 	</div>

  820. </script>

  821. 

  822. <script type="text/x-red" data-help-name="AudioOutputPT8211">

  823. 	<h3>Summary</h3>

  824. 	<div class=tooltipinfo>

  825. 	<p>Transmit 16 bit stereo audio to a low-cost PT8211 DAC chip.  4X oversampling

  826. 		and filtering are automatically used to improve output quality.</p>

  827. 	<p align=center><img src="img/pt8211.jpg"></p>

  828. 	</div>

  829. 	<h3>Audio Connections</h3>

  830. 	<table class=doc align=center cellpadding=3>

  831. 		<tr class=top><th>Port</th><th>Purpose</th></tr>

  832. 		<tr class=odd><td align=center>In 0</td><td>Left Channel</td></tr>

  833. 		<tr class=odd><td align=center>In 1</td><td>Right Channel</td></tr>

  834. 	</table>

  835. 	<h3>Functions</h3>

  836. 	<p>This object has no functions to call from the Arduino sketch.  It

  837. 		simply streams data from its 2 input ports to a PT8211 chip.  4X

  838. 		oversampling and filtering is automatically used to improve quality.</p>

  839. 	<h3>Hardware</h3>

  840. 	<table class=doc align=center cellpadding=3>

  841. 		<tr class=top><th>Pin</th><th>Signal</th><th>Direction</th></tr>

  842. 		<tr class=odd><td align=center>9</td><td>BCK</td><td>Output</td></tr>

  843. 		<tr class=odd><td align=center>22</td><td>DIN</td><td>Output</td></tr>

  844. 		<tr class=odd><td align=center>23</td><td>WS</td><td>Output</td></tr>

  845. 	</table>

  846. 	<p>More information can be found in the PT8211 datasheet.

  847. 		</p>

  848. 	<h3>Examples</h3>

  849. 	<p class=exam>File &gt; Examples &gt; Audio &gt; HardwareTesting &gt; PT8211Sine

  850. 	</p>

  851. 	<h3>Credits</h3>

  852. 	<p>Frank Boesing and Benjamin developed this PT8211 object.  Details can be

  853. 		found on this

  854. 		<a href="https://forum.pjrc.com/threads/29284-Dual-channel-16bit-dac-PT8211/page3" target="_blank">forum disussion</a>.

  855. 	<h3>Notes</h3>

  856. 	<p>

  857. 	</p>

  858. </script>

  859. <script type="text/x-red" data-template-name="AudioOutputPT8211">

  860. 	<div class="form-row">

  861. 		<label for="node-input-name"><i class="fa fa-tag"></i> Name</label>

  862. 		<input type="text" id="node-input-name" placeholder="Name">

  863. 	</div>

  864. </script>

  865. 

  866. <script type="text/x-red" data-help-name="AudioOutputAnalog">

  867. 	<h3>Summary</h3>

  868. 	<div class=tooltipinfo>

  869. 	<p>Transmit 12 bit audio using Teensy's built-in digital to analog converter.</p>

  870. 	<p align=center><img src="img/dac_speaker.jpg"><br>

  871. 	<small><a href="http://www.pjrc.com/store/prop_shield.html" target="_blank_">Prop Shield with 4&ohm; Speaker</a></small></p>

  872. 	</div>

  873. 	<h3>Audio Connections</h3>

  874. 	<table class=doc align=center cellpadding=3>

  875. 		<tr class=top><th>Port</th><th>Purpose</th></tr>

  876. 		<tr class=odd><td align=center>In 0</td><td>Audio Channel</td></tr>

  877. 	</table>

  878. 	<h3>Functions</h3>

  879. 	<p class=func><span class=keyword>analogReference</span>(ref);</p>

  880. 	<p class=desc>Configure output voltage range:<br>

  881. 	<span class=literal>INTERNAL</span> selects 1.2 volt peak-to-peak output.<br>

  882. 	<span class=literal>EXTERNAL</span> selects 3.3 volt peak-to-peak output.

  883. 	</p>

  884. 	<h3>Hardware</h3>

  885. 	<p align=center><img src="img/dacpin.jpg"></p>

  886. 	<p>Signal range default is 0 to 1.2V</p>

  887. 	<p>The output voltage has DC level.  Some applications require a DC-blocking capacitor.  If unsure, a 10&micro;F is usually a safe value to use.  If an aluminum or tantalum capacitor is used, the positive terminal should connect to Teensy's DAC pin.</p>

  888. 	<p>The DAC pin is used with the

  889. 	<a href="http://www.pjrc.com/store/prop_shield.html" target="_blank_">Prop Shield</a>

  890. 	to drive speakers.</p>

  891. 	<h3>Examples</h3>

  892. 	<p class=exam>File &gt; Examples &gt; Audio &gt; HardwareTesting &gt; PassThroughMono

  893. 	</p>

  894. 	<p class=exam>File &gt; Examples &gt; Audio &gt; SamplePlayer

  895. 	</p>

  896. 	<p class=exam><a href="https://github.com/PaulStoffregen/TouchGuitar" target="_blank">TouchGuitar</a>

  897. 	</p>

  898. 	<p class=exam><a href="https://community.arm.com/groups/embedded/blog/2014/05/23/led-video-panel-at-maker-faire-2014" target="_blank">LED Video Board</a>

  899. 	</p>

  900. 	<p class=exam>File &gt; Examples &gt; OctoWS2811 &gt; VideoSDcard

  901. 	</p>

  902. 	<p class=exam>File &gt; Examples &gt; SerialFlash &gt; MP3Player

  903. 	</p>

  904. 	<h3>Notes</h3>

  905. 	<p>The output rate is 44.1 kHz (no oversampling).  Ultrasonic noise present if

  906. 		not filtered.  This may not

  907. 		be an issue for many uses, but care should be used if amplified and driven

  908. 		to high power tweeters.</p>

  909. 	<p>When using 3.3V output, the power supply is used for the analog reference.  Noise

  910. 		present on the 3.3V power can couple to the DAC output signal.

  911. 	</p>

  912. </script>

  913. <script type="text/x-red" data-template-name="AudioOutputAnalog">

  914. 	<div class="form-row">

  915. 		<label for="node-input-name"><i class="fa fa-tag"></i> Name</label>

  916. 		<input type="text" id="node-input-name" placeholder="Name">

  917. 	</div>

  918. </script>

  919. 

  920. <script type="text/x-red" data-help-name="AudioOutputPWM">

  921. 	<h3>Summary</h3>

  922. 	<div class=tooltipinfo>

  923. 	<p>Transmit audio using Teensy 3.1's PWM pins.  Two pins are

  924. 		used for coarse and fine pulses, to be combined by scaled

  925. 		resistors.</p>

  926. 	</div>

  927. 	<h3>Audio Connections</h3>

  928. 	<table class=doc align=center cellpadding=3>

  929. 		<tr class=top><th>Port</th><th>Purpose</th></tr>

  930. 		<tr class=odd><td align=center>In 0</td><td>Audio Channel</td></tr>

  931. 	</table>

  932. 	<h3>Functions</h3>

  933. 	<p>This object has no functions to call from the Arduino sketch.  It

  934. 		simply streams data from the its input port to the PWM pins.</p>

  935. 	<h3>Hardware</h3>

  936. 	<p>The following circuit is recommended.</p>

  937. 	<p align=center><img src="img/pwmdualcircuit.jpg"></p>

  938. 	<p>Signal range is approx 1.55 Vp-p.</p>

  939. 	<p>These resistor values assume approx 20 ohms output impedance

  940. 		on the digital pins.  The 127K resistor may be adjusted or

  941. 		trimmed for variation in output drive and tolerance on the

  942. 		475 ohm resistor.</p>

  943. 	<p>A plastic film (Polypropylene, Polyethylene, Polyester, etc) or

  944. 		C0G/NPO ceramic capacitor should be used for filtering.  Low

  945. 		quality ceramic (X7R, Y5V, Z5U, etc) can cause signal distortion.</p>

  946. 	<h3>Examples</h3>

  947. 	<p class=exam>File &gt; Examples &gt; Audio &gt; HardwareTesting &gt; PassThroughMono

  948. 	</p>

  949. 	<h3>Notes</h3>

  950. 	<p>This object only works properly when Tools &gt; CPU_Speed is set to

  951. 		48 or 96 MHz.  Other speeds aren't supported and will likely fail

  952. 		in strange ways.</p>

  953. 	<p>The PWM carrier frequency is 88.2 kHz.  The suggested circuit

  954. 		will only slightly filter the carrier.  Extra filtering will be

  955. 		required for a clean signal without the ultrasonic PWM carrier.

  956. 		</p>

  957. 	<p>Analog signals created by filtering PWM waveforms use the digital

  958. 		power supply as their reference voltage.  Any noise on the digital

  959. 		power line can directly couple to the output signal.  The built-in DAC or

  960. 		<a href="http://www.pjrc.com/store/teensy3_audio.html" target="_blank">audio shield</a>

  961. 		should be used when higher quality signals are needed.</p>

  962. </script>

  963. <script type="text/x-red" data-template-name="AudioOutputPWM">

  964. 	<div class="form-row">

  965. 		<label for="node-input-name"><i class="fa fa-tag"></i> Name</label>

  966. 		<input type="text" id="node-input-name" placeholder="Name">

  967. 	</div>

  968. </script>

  969. 

  970. <script type="text/x-red" data-help-name="AudioOutputI2Sslave">

  971. 	<h3>Summary</h3>

  972. 	<div class=tooltipinfo>

  973. 	<p>Transmit 16 bit stereo audio to an I2S device using I2S slave mode

  974. 		(where the DAC or codec chip, not Teensy, controls audio timing).</p>

  975. 	</div>

  976. 	<h3>Audio Connections</h3>

  977. 	<table class=doc align=center cellpadding=3>

  978. 		<tr class=top><th>Port</th><th>Purpose</th></tr>

  979. 		<tr class=odd><td align=center>In 0</td><td>Left Channel</td></tr>

  980. 		<tr class=odd><td align=center>In 1</td><td>Right Channel</td></tr>

  981. 	</table>

  982. 	<h3>Functions</h3>

  983. 	<p>This object has no functions to call from the Arduino sketch.  It

  984. 		simply streams data from its 2 input ports to the I2S hardware.</p>

  985. 	<h3>Hardware</h3>

  986. 	<p>The I2S signals are used in "slave" mode, where the I2S device controls

  987. 		data timing.</p>

  988. 	<table class=doc align=center cellpadding=3>

  989. 		<tr class=top><th>Pin</th><th>Signal</th><th>Direction</th></tr>

  990. 		<tr class=odd><td align=center>9</td><td>BCLK</td><td>Input</td></tr>

  991. 		<tr class=odd><td align=center>22</td><td>TX</td><td>Output</td></tr>

  992. 		<tr class=odd><td align=center>23</td><td>LRCLK</td><td>Input</td></tr>

  993. 	</table>

  994. 	<h3>Examples</h3>

  995. 	<p class=exam>File &gt; Examples &gt; Audio &gt; HardwareTesting &gt; WM8731MikroSine

  996. 	</p>

  997. 	<h3>Notes</h3>

  998. 	<p>Slave mode I2S <b>should not used in the same project as ADC, DAC and

  999. 		PWM</b> signals.  Differences in timing between the I2S device and

  1000. 		Teensy's clock can cause occasional audio glitches when I2S slave mode

  1001. 		is used together with other input or output objects based on Teensy's

  1002. 		timing.</p>

  1003. 	<p>Only one I2S input and one I2S output object may be used.  Master

  1004. 		and slave modes may not be mixed (both must be of the same type).

  1005. 	</p>

  1006. </script>

  1007. <script type="text/x-red" data-template-name="AudioOutputI2Sslave">

  1008. 	<div class="form-row">

  1009. 		<label for="node-input-name"><i class="fa fa-tag"></i> Name</label>

  1010. 		<input type="text" id="node-input-name" placeholder="Name">

  1011. 	</div>

  1012. </script>

  1013. 

  1014. <script type="text/x-red" data-help-name="AudioOutputUSB">

  1015. 	<h3>Summary</h3>

  1016. 	<div class=tooltipinfo>

  1017. 	<p>Send stereo audio to a PC or Mac.  Teensy appears as a USB

  1018. 		sound device.</p>

  1019. 	<p align=center><img src="img/usbtype_audio_out.png"></p>

  1020. 	</div>

  1021. 	<h3>Audio Connections</h3>

  1022. 	<table class=doc align=center cellpadding=3>

  1023. 		<tr class=top><th>Port</th><th>Purpose</th></tr>

  1024. 		<tr class=odd><td align=center>In 0</td><td>Left Channel</td></tr>

  1025. 		<tr class=odd><td align=center>In 1</td><td>Right Channel</td></tr>

  1026. 	</table>

  1027. 	<h3>Functions</h3>

  1028. 	<p>This object has no functions to call from the Arduino sketch.  It

  1029. 		simply streams from it's 2 input ports to the USB.</p>

  1030. 	<!--

  1031. 	<h3>Hardware</h3>

  1032. 	-->

  1033. 	<h3>Examples</h3>

  1034. 	<p class=exam>File &gt; Examples &gt; Audio &gt; HardwareTesting &gt; WavFilePlayerUSB</p>

  1035. 	</p>

  1036. 	<h3>Notes</h3>

  1037. 	<p>Arduino's <b>Tools &gt; USB Type</b> menu must be set to <b>Audio</b>.

  1038. 		</p>

  1039. 	<p align=center><img src="img/usbtype_audio.png"></p>

  1040. 	<p>USB input &amp; output does not cause the Teensy Audio Library to

  1041. 		update.  At least one non-USB input or output object must be

  1042. 		present for the entire library to update properly.</p>

  1043. </script>

  1044. <script type="text/x-red" data-template-name="AudioOutputUSB">

  1045. 	<div class="form-row">

  1046. 		<label for="node-input-name"><i class="fa fa-tag"></i> Name</label>

  1047. 		<input type="text" id="node-input-name" placeholder="Name">

  1048. 	</div>

  1049. </script>

  1050. 

  1051. <script type="text/x-red" data-help-name="AudioMixer4">

  1052. 	<h3>Summary</h3>

  1053. 	<div class=tooltipinfo>

  1054. 	<p>Combine up to 4 audio signals together, each with adjustable gain.

  1055. 		All channels support signal attenuation or amplification.</p>

  1056. 	</div>

  1057. 	<h3>Audio Connections</h3>

  1058. 	<table class=doc align=center cellpadding=3>

  1059. 		<tr class=top><th>Port</th><th>Purpose</th></tr>

  1060. 		<tr class=odd><td align=center>In 0</td><td>Input signal #1</td></tr>

  1061. 		<tr class=odd><td align=center>In 1</td><td>Input signal #2</td></tr>

  1062. 		<tr class=odd><td align=center>In 2</td><td>Input signal #3</td></tr>

  1063. 		<tr class=odd><td align=center>In 3</td><td>Input signal #4</td></tr>

  1064. 		<tr class=odd><td align=center>Out 0</td><td>Sum of all inputs</td></tr>

  1065. 	</table>

  1066. 	<h3>Functions</h3>

  1067. 	<p class=func><span class=keyword>gain</span>(channel, level);</p>

  1068. 	<p class=desc>Adjust the amplification or attenuation.  "channel" must

  1069. 		be 0 to 3.  "level" may be any floating point number from 0 to 32767.

  1070. 		1.0 passes the signal through directly.  Level of 0 shuts the channel

  1071. 		off completely.  Between 0 to 1.0 attenuates the signal, and above

  1072. 		1.0 amplifies it.  All 4 channels have separate settings.

  1073. 	</p>

  1074. 	<h3>Examples</h3>

  1075. 	<p class=exam>File &gt; Examples &gt; Audio &gt; SamplePlayer

  1076. 	</p>

  1077. 	<p class=exam>File &gt; Examples &gt; Audio &gt; Synthesis &gt; PlaySynthMusic

  1078. 	</p>

  1079. 	<p class=exam>File &gt; Examples &gt; Audio &gt; Analysis &gt; SpectrumAnalyzerBasic

  1080. 	</p>

  1081. 	<p class=exam>File &gt; Examples &gt; Audio &gt; Analysis &gt; DialTone_Serial

  1082. 	</p>

  1083. 	<p class=exam>File &gt; Examples &gt; Audio &gt; MemoryAndCpuUsage

  1084. 	</p>

  1085. 	<h3>Notes</h3>

  1086. 	<p>Signal clipping can occur when any channel has gain greater than 1.0,

  1087. 		or when multiple signals add together to greater than 1.0.</p>

  1088. 	<p>More than 4 channels may be combined by connecting multiple mixers

  1089. 		in tandem.  For example, a 16 channel mixer may be built using 5

  1090. 		mixers, where the fifth mixer combines the outputs of the first 4.

  1091. 	</p>

  1092. </script>

  1093. <script type="text/x-red" data-template-name="AudioMixer4">

  1094. 	<div class="form-row">

  1095. 		<label for="node-input-name"><i class="fa fa-tag"></i> Name</label>

  1096. 		<input type="text" id="node-input-name" placeholder="Name">

  1097. 	</div>

  1098. </script>

  1099. 

  1100. <script type="text/x-red" data-help-name="AudioPlayMemory">

  1101. 	<h3>Summary</h3>

  1102. 	<div class=tooltipinfo>

  1103. 	<p>Play a short sound clip, stored directly in memory.

  1104. 		Data files are created with the

  1105. 		<a href="https://github.com/PaulStoffregen/Audio/tree/master/extras/wav2sketch" target="_blank">wav2sketch program</a>,

  1106. 		and copied to the sketch folder to become part of your sketch.</p>

  1107. 	</div>

  1108. 	<h3>Audio Connections</h3>

  1109. 	<table class=doc align=center cellpadding=3>

  1110. 		<tr class=top><th>Port</th><th>Purpose</th></tr>

  1111. 		<tr class=odd><td align=center>Out 0</td><td>Sound Output</td></tr>

  1112. 	</table>

  1113. 	<h3>Functions</h3>

  1114. 	<p class=func><span class=keyword>play</span>(data);</p>

  1115. 	<p class=desc>Begin playing a sound clip.  If already playing, the

  1116. 		currently playing clip is stopped and this new data begins

  1117. 		playing from the beginning.

  1118. 	</p>

  1119. 	<p class=func><span class=keyword>stop</span>();</p>

  1120. 	<p class=desc>Stop playing.  If not playing, this function has no effect.

  1121. 	</p>

  1122. 	<p class=func><span class=keyword>isPlaying</span>();</p>

  1123. 	<p class=desc>Return true (non-zero) if playing, or false (zero)

  1124. 		when not playing.

  1125. 	</p>

  1126. 	<p class=func><span class=keyword>positionMillis</span>();</p>

  1127. 	<p class=desc>While playing, return the current time offset, in

  1128. 		milliseconds.  When not playing, the return from this function

  1129. 		is undefined.

  1130. 	</p>

  1131. 	<p class=func><span class=keyword>lengthMillis</span>();</p>

  1132. 	<p class=desc>Return the total length of the current sound clip,

  1133. 		in milliseconds.  When not playing, the return from this function

  1134. 		is undefined.

  1135. 	</p>

  1136. 	<h3>Examples</h3>

  1137. 	<p class=exam>File &gt; Examples &gt; Audio &gt; SamplePlayer

  1138. 	</p>

  1139. 	<h3>Notes</h3>

  1140. 	<p>TODO: supported sample rates: 11.025, 22.05, 44.1</p>

  1141. 	<p>TODO: ulaw vs uncompressed encoding</p>

  1142. 	<p>Polyphonic playback can be built by creating multiple

  1143. 		objects, with their output combined by mixers.</p>

  1144. </script>

  1145. <script type="text/x-red" data-template-name="AudioPlayMemory">

  1146. 	<div class="form-row">

  1147. 		<label for="node-input-name"><i class="fa fa-tag"></i> Name</label>

  1148. 		<input type="text" id="node-input-name" placeholder="Name">

  1149. 	</div>

  1150. </script>

  1151. 

  1152. <script type="text/x-red" data-help-name="AudioPlaySdWav">

  1153. 	<h3>Summary</h3>

  1154. 	<div class=tooltipinfo>

  1155. 	<p>Play a WAV file, stored on a SD card.</p>

  1156. 	</div>

  1157. 	<h3>Audio Connections</h3>

  1158. 	<table class=doc align=center cellpadding=3>

  1159. 		<tr class=top><th>Port</th><th>Purpose</th></tr>

  1160. 		<tr class=odd><td align=center>Out 0</td><td>Left Channel Output</td></tr>

  1161. 		<tr class=odd><td align=center>Out 1</td><td>Right Channel Output</td></tr>

  1162. 	</table>

  1163. 	<h3>Functions</h3>

  1164. 	<p class=func><span class=keyword>play</span>(filename);</p>

  1165. 	<p class=desc>Begin playing a WAV file.  If a file is already playing,

  1166. 		it is stopped and this file starts playing from the beginning.

  1167. 	</p>

  1168. 	<p class=func><span class=keyword>stop</span>();</p>

  1169. 	<p class=desc>Stop playing.  If not playing, this function has no effect.

  1170. 	</p>

  1171. 	<p class=func><span class=keyword>isPlaying</span>();</p>

  1172. 	<p class=desc>Return true (non-zero) if playing, or false (zero)

  1173. 		when not playing.  See the note below about delayed start.

  1174. 	</p>

  1175. 	<p class=func><span class=keyword>positionMillis</span>();</p>

  1176. 	<p class=desc>While playing, return the current time offset, in

  1177. 		milliseconds.  When not playing, the return from this function

  1178. 		is undefined.

  1179. 	</p>

  1180. 	<p class=func><span class=keyword>lengthMillis</span>();</p>

  1181. 	<p class=desc>Return the total length of the current sound clip,

  1182. 		in milliseconds.  When not playing, the return from this function

  1183. 		is undefined.

  1184. 	</p>

  1185. 	<h3>Examples</h3>

  1186. 	<p class=exam>File &gt; Examples &gt; Audio &gt; WavFilePlayer

  1187. 	</p>

  1188. 	<h3>Notes</h3>

  1189. 	<p>Only 16 bit PCM, 44100 Hz WAV files are supported.  When mono

  1190. 		files are played, both output ports transmit a copy of the

  1191. 		single sound.  Of course, stereo WAV files play with the left

  1192. 		channel on port 0 and the right channel on port 1.

  1193. 	</p>

  1194. 	<p>A brief delay after calling play() will usually occur before

  1195. 		isPlaying() returns true and positionMillis() returns valid

  1196. 		time offset.  WAV files have a header at the beginning of the

  1197. 		file, which the audio library must read and parse before

  1198. 		playing can begin.

  1199. 	</p>

  1200. 	<p>While playing, the audio library accesses the SD card automatically.

  1201. 		If card access is required, you must

  1202. 		<a href="http://www.pjrc.com/teensy/td_libs_AudioProcessorUsage.html" target="_blank">use AudioNoInterrupts()</a>

  1203. 		to prevent the library from accessing the SD card while you use it.

  1204. 		Disabling the audio library interrupt for too long may cause audible

  1205. 		dropouts or glitches.

  1206. 	</p>

  1207. 	<p>An experimental SD library optimization exists, which can remove these

  1208. 		SD library restrictions.  It also allows reliable playback of more

  1209. 		files at the same time.  To enable this special code, find and edit

  1210. 		the SD_t3.h file within your Arduino folder.  See the comments within

  1211. 		that file for details.

  1212. 	</p>

  1213. 

  1214. </script>

  1215. <script type="text/x-red" data-template-name="AudioPlaySdWav">

  1216. 	<div class="form-row">

  1217. 		<label for="node-input-name"><i class="fa fa-tag"></i> Name</label>

  1218. 		<input type="text" id="node-input-name" placeholder="Name">

  1219. 	</div>

  1220. </script>

  1221. 

  1222. <script type="text/x-red" data-help-name="AudioPlaySdRaw">

  1223. 	<h3>Summary</h3>

  1224. 	<div class=tooltipinfo>

  1225. 	<p>Play a RAW data file, stored on a SD card.  RAW format is simpler

  1226. 		than WAV and begins playing immediately, without parsing WAV file

  1227. 		header info.</p>

  1228. 	</div>

  1229. 	<h3>Audio Connections</h3>

  1230. 	<table class=doc align=center cellpadding=3>

  1231. 		<tr class=top><th>Port</th><th>Purpose</th></tr>

  1232. 		<tr class=odd><td align=center>Out 0</td><td>Sound Output</td></tr>

  1233. 	</table>

  1234. 	<h3>Functions</h3>

  1235. 	<p class=func><span class=keyword>play</span>(filename);</p>

  1236. 	<p class=desc>Begin playing a RAW data file.  If a file is already playing,

  1237. 		it is stopped and this file starts playing from the beginning.

  1238. 	</p>

  1239. 	<p class=func><span class=keyword>stop</span>();</p>

  1240. 	<p class=desc>Stop playing.  If not playing, this function has no effect.

  1241. 	</p>

  1242. 	<p class=func><span class=keyword>isPlaying</span>();</p>

  1243. 	<p class=desc>Return true (non-zero) if playing, or false (zero)

  1244. 		when not playing.

  1245. 	</p>

  1246. 	<p class=func><span class=keyword>positionMillis</span>();</p>

  1247. 	<p class=desc>While playing, return the current time offset, in

  1248. 		milliseconds.  When not playing, the return from this function

  1249. 		is undefined.

  1250. 	</p>

  1251. 	<p class=func><span class=keyword>lengthMillis</span>();</p>

  1252. 	<p class=desc>Return the total length of the current sound clip,

  1253. 		in milliseconds.  When not playing, the return from this function

  1254. 		is undefined.

  1255. 	</p>

  1256. 	<h3>Examples</h3>

  1257. 	<p class=exam>File &gt; Examples &gt; Audio &gt; Recorder

  1258. 	</p>

  1259. 	<h3>Notes</h3>

  1260. 	<p>The data file must be RAW 16 bit signed integers in LSB-first format.

  1261. 	</p>

  1262. 	<p>While playing, the audio library accesses the SD card automatically.

  1263. 		If card access is required, you must

  1264. 		<a href="http://www.pjrc.com/teensy/td_libs_AudioProcessorUsage.html" target="_blank">AudioNoInterrupts()</a>

  1265. 		to prevent the library from accessing the SD card while you use it.

  1266. 		Disabling the audio library interrupt for too long may cause audible

  1267. 		dropouts or glitches.

  1268. 	</p>

  1269. </script>

  1270. <script type="text/x-red" data-template-name="AudioPlaySdRaw">

  1271. 	<div class="form-row">

  1272. 		<label for="node-input-name"><i class="fa fa-tag"></i> Name</label>

  1273. 		<input type="text" id="node-input-name" placeholder="Name">

  1274. 	</div>

  1275. </script>

  1276. 

  1277. <script type="text/x-red" data-help-name="AudioPlaySerialflashRaw">

  1278. 	<h3>Summary</h3>

  1279. 	<div class=tooltipinfo>

  1280. 	<p>Play a RAW data file, stored on a Serial Flash chip.  These chips

  1281. 		are far more efficient than SD cards, allowing many files to be

  1282. 		played simultaneously by copies of this object.

  1283. 		</p>

  1284. 	<p align=center><img src="img/w25q128fv.jpg"><br><small>W25Q128FV Serial Flash</small></p>

  1285. 	</div>

  1286. 	<h3>Audio Connections</h3>

  1287. 	<table class=doc align=center cellpadding=3>

  1288. 		<tr class=top><th>Port</th><th>Purpose</th></tr>

  1289. 		<tr class=odd><td align=center>Out 0</td><td>Sound Output</td></tr>

  1290. 	</table>

  1291. 	<h3>Functions</h3>

  1292. 	<p class=func><span class=keyword>play</span>(filename);</p>

  1293. 	<p class=desc>Begin playing a RAW data file.  If a file is already playing,

  1294. 		it is stopped and this file starts playing from the beginning.

  1295. 	</p>

  1296. 	<p class=func><span class=keyword>stop</span>();</p>

  1297. 	<p class=desc>Stop playing.  If not playing, this function has no effect.

  1298. 	</p>

  1299. 	<p class=func><span class=keyword>isPlaying</span>();</p>

  1300. 	<p class=desc>Return true (non-zero) if playing, or false (zero)

  1301. 		when not playing.

  1302. 	</p>

  1303. 	<p class=func><span class=keyword>positionMillis</span>();</p>

  1304. 	<p class=desc>While playing, return the current time offset, in

  1305. 		milliseconds.  When not playing, the return from this function

  1306. 		is undefined.

  1307. 	</p>

  1308. 	<p class=func><span class=keyword>lengthMillis</span>();</p>

  1309. 	<p class=desc>Return the total length of the current sound clip,

  1310. 		in milliseconds.  When not playing, the return from this function

  1311. 		is undefined.

  1312. 	</p>

  1313. 	<h3>Examples</h3>

  1314. 	<!--

  1315. <p class=exam>File &gt; Examples &gt; Audio &gt; Recorder

  1316. -->

  1317. 	<p class=exam>TODO: play example needed....

  1318. 	</p>

  1319. 	<p class=exam>File &gt; Examples &gt; SerialFlash &gt; CopyFromSD

  1320. 	</p>

  1321. 	<h3>Notes</h3>

  1322. 	<p>The data file must be RAW 16 bit signed integers in LSB-first format.

  1323. 	</p>

  1324. 	<p>The <a href="https://github.com/PaulStoffregen/SerialFlash" target="_blank">SerialFlash library</a>

  1325. 		is used to access the flash chip.  You can also use SerialFlash's functions

  1326. 		to access the stored files, or add data to the flash chip.

  1327. 	</p>

  1328. 	<p>File names are case sensitive with SerialFlash.  If your sound does

  1329. 		not play, use <b>File &gt; Examples &gt; SerialFlash &gt; ListFiles</b> to

  1330. 		check the exact file names stored in the flash memory chip.

  1331. </script>

  1332. <script type="text/x-red" data-template-name="AudioPlaySerialflashRaw">

  1333. 	<div class="form-row">

  1334. 		<label for="node-input-name"><i class="fa fa-tag"></i> Name</label>

  1335. 		<input type="text" id="node-input-name" placeholder="Name">

  1336. 	</div>

  1337. </script>

  1338. 

  1339. <script type="text/x-red" data-help-name="AudioPlayQueue">

  1340. 	<h3>Summary</h3>

  1341. 	<div class=tooltipinfo>

  1342. 	<p>Play audio data provided by the Arduino sketch.  This object provides

  1343. 		functions to allow the sketch code to push data into the audio system.</p>

  1344. 	</div>

  1345. 	<h3>Audio Connections</h3>

  1346. 	<table class=doc align=center cellpadding=3>

  1347. 		<tr class=top><th>Port</th><th>Purpose</th></tr>

  1348. 		<tr class=odd><td align=center>Out 0</td><td>Sound Output</td></tr>

  1349. 	</table>

  1350. 	<h3>Functions</h3>

  1351. 	<p class=func><span class=keyword>play</span>(int16);</p>

  1352. 	<p class=desc>not yet implemented

  1353. 	</p>

  1354. 	<p class=func><span class=keyword>play</span>(int16[], length);</p>

  1355. 	<p class=desc>not yet implemented

  1356. 	</p>

  1357. 	<p class=func><span class=keyword>getBuffer</span>();</p>

  1358. 	<p class=desc>Returns a pointer to an array of 128 int16.  This buffer

  1359. 		is within the audio library memory pool, providing the most efficient

  1360. 		way to input data to the audio system.  The buffer is likely to be

  1361. 		populated by previously used data, so the entire 128 words should be

  1362. 		written before calling playBuffer().  Only a single buffer should be

  1363. 		requested at a time.  This function may return NULL if no memory is

  1364. 		available.

  1365. 	</p>

  1366. 	<p class=func><span class=keyword>playBuffer</span>();</p>

  1367. 	<p class=desc>Transmit the buffer previously obtained from getBuffer().

  1368. 	</p>

  1369. 	<h3>Examples</h3>

  1370. 		<p><a href="http://community.arm.com/groups/embedded/blog/2014/05/23/led-video-panel-at-maker-faire-2014" target="_blank">4320 LED Video+Sound Project</a>

  1371. 		</p>

  1372. 	<!--

  1373. <p class=exam>File &gt; Examples &gt; Audio &gt;

  1374. 	</p>

  1375. -->

  1376. 	<h3>Notes</h3>

  1377. 	<p>TODO: many caveats....</p>

  1378. 	<p>

  1379. 	</p>

  1380. </script>

  1381. <script type="text/x-red" data-template-name="AudioPlayQueue">

  1382. 	<div class="form-row">

  1383. 		<label for="node-input-name"><i class="fa fa-tag"></i> Name</label>

  1384. 		<input type="text" id="node-input-name" placeholder="Name">

  1385. 	</div>

  1386. </script>

  1387. 

  1388. <script type="text/x-red" data-help-name="AudioRecordQueue">

  1389. 	<h3>Summary</h3>

  1390. 	<div class=tooltipinfo>

  1391. 	<p>Record audio data by sending to the Arduino sketch.  This object allows

  1392. 		sketch code to receive audio packets.</p>

  1393. 	</div>

  1394. 	<h3>Audio Connections</h3>

  1395. 	<table class=doc align=center cellpadding=3>

  1396. 		<tr class=top><th>Port</th><th>Purpose</th></tr>

  1397. 		<tr class=odd><td align=center>In 0</td><td>Sound To Access</td></tr>

  1398. 	</table>

  1399. 	<h3>Functions</h3>

  1400. 	<p class=func><span class=keyword>begin</span>();</p>

  1401. 	<p class=desc>Begin capturing incoming audio to the queue.  After calling

  1402. 		begin, readBuffer() and freeBuffer(), or clear() must be used frequently

  1403. 		to prevent the queue from filling up.

  1404. 	</p>

  1405. 	<p class=func><span class=keyword>available</span>();</p>

  1406. 	<p class=desc>Returns the number of audio packets available to read.

  1407. 	</p>

  1408. 	<p class=func><span class=keyword>readBuffer</span>();</p>

  1409. 	<p class=desc>Read a single audio packet.  A pointer to a 128 sample

  1410. 		array of 16 bit integers is returned.  NULL is returned if no packets

  1411. 		are available.

  1412. 	</p>

  1413. 	<p class=func><span class=keyword>freeBuffer</span>();</p>

  1414. 	<p class=desc>Release the memory from the previously read packet returned

  1415. 		from readBuffer().  Only a single packet at a time may be read, and

  1416. 		each packet must be freed with this function, to return the memory to

  1417. 		the audio library.

  1418. 	</p>

  1419. 	<p class=func><span class=keyword>clear</span>();</p>

  1420. 	<p class=desc>Discard all audio held in the queue.

  1421. 	</p>

  1422. 	<p class=func><span class=keyword>end</span>();</p>

  1423. 	<p class=desc>Stop capturing incoming audio into the queue.  Data already

  1424. 		captured remains in the queue and may be read with readBuffer().

  1425. 	</p>

  1426. 	<h3>Examples</h3>

  1427. 	<p class=exam>File &gt; Examples &gt; Audio &gt; Recorder

  1428. 	</p>

  1429. 	<h3>Notes</h3>

  1430. 	<p>

  1431. 		Up to 52 packets may be queued by this object, which allows approximately

  1432. 		150 ms of audio to be held in the queue, to allow time for the Arduino

  1433. 		sketch to write data to media or do other high-latency tasks.

  1434. 

  1435. The actual packets are taken

  1436. 		from the pool created by AudioMemory().

  1437. 	</p>

  1438. </script>

  1439. <script type="text/x-red" data-template-name="AudioRecordQueue">

  1440. 	<div class="form-row">

  1441. 		<label for="node-input-name"><i class="fa fa-tag"></i> Name</label>

  1442. 		<input type="text" id="node-input-name" placeholder="Name">

  1443. 	</div>

  1444. </script>

  1445. 

  1446. <script type="text/x-red" data-help-name="AudioSynthSimpleDrum">

  1447. 	<h3>Summary</h3>

  1448. 	<div class=tooltipinfo>

  1449. 	<p>Generate a synthesised drum sound.  Also useful for laser pistol and bursting

  1450. 		bubble sound effects.</p>

  1451. 	</div>

  1452. 	<h3>Audio Connections</h3>

  1453. 	<table class=doc align=center cellpadding=3>

  1454. 		<tr class=top><th>Port</th><th>Purpose</th></tr>

  1455. 		<tr class=odd><td align=center>Out 0</td><td>Drum Tone Output</td></tr>

  1456. 	</table>

  1457. 	<h3>Functions</h3>

  1458. 	<p class=func><span class=keyword>noteOn</span>();</p>

  1459. 	<p class=desc>Trigger the drum.

  1460. 	</p>

  1461. 	<p class=func><span class=keyword>frequency</span>(frequency);</p>

  1462. 	<p class=desc>Set the base frequency of the drum.

  1463. 	</p>

  1464. 	<p class=func><span class=keyword>length</span>(milliseconds);</p>

  1465. 	<p class=desc>Set the duration of the envelope, in milliseconds.

  1466. 	</p>

  1467. 	<p class=func><span class=keyword>secondMix</span>(level);</p>

  1468. 	<p class=desc>Emulates a two-headed tom, by adding a second sine wave that is

  1469. 	harmonized a perfect fifth above

  1470. 	the base frequency.  Using this involves a slight CPU penalty.

  1471. 	</p>

  1472. 	<p class=func><span class=keyword>pitchMod</span>(depth);</p>

  1473. 	<p class=desc>Set the depth of envelope of the pitch, by a maximum of two octaves.

  1474. 	Default is 0.5, with no modulation.  Values above 0.5 cause the pitch to sweep

  1475. 	downwards, values lower than 0.5 cause the pitch to sweep upwards.

  1476. 	</p>

  1477. 	<h3>Examples</h3>

  1478. 	<p class=exam>File &gt; Examples &gt; Synthesis &gt; SimpleDrum

  1479. 	</p>

  1480. 	<h3>Notes</h3>

  1481. 	<p></p>

  1482. </script>

  1483. <script type="text/x-red" data-template-name="AudioSynthSimpleDrum">

  1484. 	<div class="form-row">

  1485. 		<label for="node-input-name"><i class="fa fa-tag"></i> Name</label>

  1486. 		<input type="text" id="node-input-name" placeholder="Name">

  1487. 	</div>

  1488. </script>

  1489. 

  1490. <script type="text/x-red" data-help-name="AudioSynthKarplusStrong">

  1491. 	<h3>Summary</h3>

  1492. 	<div class=tooltipinfo>

  1493. 	<p>Synthesize a plucked string sound, such as a guitar string.

  1494. 		</p>

  1495. 	<p align=center><img src="img/touchguitar.jpg"></p>

  1496. 	</div>

  1497. 	<h3>Audio Connections</h3>

  1498. 	<table class=doc align=center cellpadding=3>

  1499. 		<tr class=top><th>Port</th><th>Purpose</th></tr>

  1500. 		<tr class=odd><td align=center>Out 0</td><td>Sound Output</td></tr>

  1501. 	</table>

  1502. 	<h3>Functions</h3>

  1503. 	<p class=func><span class=keyword>noteOn</span>(frequency, velocity);</p>

  1504. 	<p class=desc>Begin a new string note.  Velocity can be from 0 to 1.0,

  1505. 		indicating how hard the string is plucked.

  1506. 	</p>

  1507. 	<p class=func><span class=keyword>noteOff</span>(velocity);</p>

  1508. 	<p class=desc>Stop the sound output.

  1509. 	</p>

  1510. 	<h3>Examples</h3>

  1511. 	<p class=exam>File &gt; Examples &gt; Synthesis &gt; Guitar

  1512. 	</p>

  1513. 	<p class=exam><a href="https://github.com/PaulStoffregen/TouchGuitar" target="_blank">TouchGuitar</a>

  1514. 	</p>

  1515. 	<h3>Notes</h3>

  1516. 	<p></p>

  1517. </script>

  1518. <script type="text/x-red" data-template-name="AudioSynthSimpleDrum">

  1519. 	<div class="form-row">

  1520. 		<label for="node-input-name"><i class="fa fa-tag"></i> Name</label>

  1521. 		<input type="text" id="node-input-name" placeholder="Name">

  1522. 	</div>

  1523. </script>

  1524. 

  1525. <script type="text/x-red" data-help-name="AudioSynthWaveformSine">

  1526. 	<h3>Summary</h3>

  1527. 	<div class=tooltipinfo>

  1528. 	<p>Create a sine wave signal</p>

  1529. 	</div>

  1530. 	<h3>Audio Connections</h3>

  1531. 	<table class=doc align=center cellpadding=3>

  1532. 		<tr class=top><th>Port</th><th>Purpose</th></tr>

  1533. 		<tr class=odd><td align=center>Out 0</td><td>Sine Wave Output</td></tr>

  1534. 	</table>

  1535. 	<h3>Functions</h3>

  1536. 	<p class=func><span class=keyword>amplitude</span>(level);</p>

  1537. 	<p class=desc>Set the amplitude, from 0 to 1.0.

  1538. 	</p>

  1539. 	<p class=func><span class=keyword>frequency</span>(freq);</p>

  1540. 	<p class=desc>Set the frequency, from 0 to 22000.  Very low values may

  1541. 		be used to create a LFO (Low Frequency Oscillator) for objects

  1542. 		with modulation signal inputs.

  1543. 	</p>

  1544. 	<p class=func><span class=keyword>phase</span>(angle);</p>

  1545. 	<p class=desc>

  1546. 		Cause the generated waveform to jump to a specific point within

  1547. 		its cycle.  Angle is from 0 to 360 degrees.  When multiple objects

  1548. 		are configured,

  1549. 		<a href="http://www.pjrc.com/teensy/td_libs_AudioProcessorUsage.html" target="_blank">AudioNoInterrupts()</a>

  1550. 		should be used to guarantee all new settings take effect together.

  1551. 	</p>

  1552. 	<h3>Examples</h3>

  1553. 	<p class=exam>File &gt; Examples &gt; Audio &gt; MemoryAndCpuUsage

  1554. 	</p>

  1555. 	<p class=exam>File &gt; Examples &gt; Audio &gt; Analysis &gt; DialTone_Serial

  1556. 	</p>

  1557. 	<p class=exam>File &gt; Examples &gt; Audio &gt; Analysis &gt; FFT

  1558. 	</p>

  1559. 	<h3>Notes</h3>

  1560. 	<p></p>

  1561. </script>

  1562. <script type="text/x-red" data-template-name="AudioSynthWaveformSine">

  1563. 	<div class="form-row">

  1564. 		<label for="node-input-name"><i class="fa fa-tag"></i> Name</label>

  1565. 		<input type="text" id="node-input-name" placeholder="Name">

  1566. 	</div>

  1567. </script>

  1568. 

  1569. <script type="text/x-red" data-help-name="AudioSynthWaveformSineHires">

  1570. 	<h3>Summary</h3>

  1571. 	<div class=tooltipinfo>

  1572. 	<p>Create a highly precise, low distortion sine wave signal.

  1573. 		Mainly useful for codec &amp; analog circuitry testing.</p>

  1574. 	</div>

  1575. 	<h3>Audio Connections</h3>

  1576. 	<table class=doc align=center cellpadding=3>

  1577. 		<tr class=top><th>Port</th><th>Purpose</th></tr>

  1578. 		<tr class=odd><td align=center>Out 0</td><td>Sine Wave, upper bits</td></tr>

  1579. 		<tr class=odd><td align=center>Out 1</td><td>Sine Wave, lower bits</td></tr>

  1580. 	</table>

  1581. 	<h3>Functions</h3>

  1582. 	<p class=func><span class=keyword>amplitude</span>(level);</p>

  1583. 	<p class=desc>Set the amplitude, from 0 to 1.0.

  1584. 	</p>

  1585. 	<p class=func><span class=keyword>frequency</span>(freq);</p>

  1586. 	<p class=desc>Set the frequency, from 0 to 22000.  Very low values may

  1587. 		be used to create a LFO (Low Frequency Oscillator) for objects

  1588. 		with modulation signal inputs.

  1589. 	</p>

  1590. 	<p class=func><span class=keyword>phase</span>(angle);</p>

  1591. 	<p class=desc>

  1592. 		Cause the generated waveform to jump to a specific point within

  1593. 		its cycle.  Angle is from 0 to 360 degrees.  When multiple objects

  1594. 		are configured,

  1595. 		<a href="http://www.pjrc.com/teensy/td_libs_AudioProcessorUsage.html" target="_blank">AudioNoInterrupts()</a>

  1596. 		should be used to guarantee all new settings take effect together.

  1597. 	</p>

  1598. 	<h3>Notes</h3>

  1599. 	<p>An 11th order Taylor series approximation is used to generate

  1600. 		a very accurate sine wave.  At least the upper 25 bits are believe

  1601. 		to be perfect.  This is mainly intended for testing 24 bit codec chips!</p>

  1602. </script>

  1603. <script type="text/x-red" data-template-name="AudioSynthWaveformSine">

  1604. 	<div class="form-row">

  1605. 		<label for="node-input-name"><i class="fa fa-tag"></i> Name</label>

  1606. 		<input type="text" id="node-input-name" placeholder="Name">

  1607. 	</div>

  1608. </script>

  1609. 

  1610. <script type="text/x-red" data-help-name="AudioSynthWaveformSineModulated">

  1611. 	<h3>Summary</h3>

  1612. 	<div class=tooltipinfo>

  1613. 	<p>Create a modulated sine wave, using any audio signal to continuously

  1614. 		modulate the sine wave frequency.</p>

  1615. 	</div>

  1616. 	<h3>Audio Connections</h3>

  1617. 	<table class=doc align=center cellpadding=3>

  1618. 		<tr class=top><th>Port</th><th>Purpose</th></tr>

  1619. 		<tr class=odd><td align=center>In 0</td><td>Modulation Signal</td></tr>

  1620. 		<tr class=odd><td align=center>Out 0</td><td>Sine Wave Output</td></tr>

  1621. 	</table>

  1622. 	<h3>Functions</h3>

  1623. 	<p class=func><span class=keyword>amplitude</span>(level);</p>

  1624. 	<p class=desc>Set the amplitude, from 0 to 1.0.

  1625. 	</p>

  1626. 	<p class=func><span class=keyword>frequency</span>(freq);</p>

  1627. 	<p class=desc>Set the center frequency, from 0 to 11000.  The output will

  1628. 		be this center frequency when the input modulation signal is zero.

  1629. 		Modulation input 1.0 causes the frequency to double, and input -1.0

  1630. 		causes zero Hz (DC) output.  For less modulation, attenuate the input

  1631. 		signal (perhaps with a mixer object) before it arrives here.

  1632. 	</p>

  1633. 	<p class=func><span class=keyword>phase</span>(angle);</p>

  1634. 	<p class=desc>

  1635. 		Cause the generated waveform to jump to a specific point within

  1636. 		its cycle.  Angle is from 0 to 360 degrees.  When multiple objects

  1637. 		are configured,

  1638. 		<a href="http://www.pjrc.com/teensy/td_libs_AudioProcessorUsage.html" target="_blank">AudioNoInterrupts()</a>

  1639. 		should be used to guarantee all new settings take effect together.

  1640. 	</p>

  1641. 	<!--

  1642. <h3>Examples</h3>

  1643. 	<p class=exam>File &gt; Examples &gt; Audio &gt;

  1644. 	</p>

  1645. -->

  1646. 	<h3>Notes</h3>

  1647. 	<p></p>

  1648. </script>

  1649. <script type="text/x-red" data-template-name="AudioSynthWaveformSineModulated">

  1650. 	<div class="form-row">

  1651. 		<label for="node-input-name"><i class="fa fa-tag"></i> Name</label>

  1652. 		<input type="text" id="node-input-name" placeholder="Name">

  1653. 	</div>

  1654. </script>

  1655. 

  1656. <script type="text/x-red" data-help-name="AudioSynthWaveform">

  1657. 	<h3>Summary</h3>

  1658. 	<div class=tooltipinfo>

  1659. 	<p>Create a waveform: sine, sawtooth, square, triangle, pulse or arbitrary.</p>

  1660. 	</div>

  1661. 	<h3>Audio Connections</h3>

  1662. 	<table class=doc align=center cellpadding=3>

  1663. 		<tr class=top><th>Port</th><th>Purpose</th></tr>

  1664. 		<tr class=odd><td align=center>Out 0</td><td>Waveform Output</td></tr>

  1665. 	</table>

  1666. 	<h3>Functions</h3>

  1667. 	<p class=func><span class=keyword>begin</span>(waveform);</p>

  1668. 	<p class=desc>Configure the waveform type to create.

  1669. 	</p>

  1670. 	<p class=func><span class=keyword>begin</span>(level, frequency, waveform);</p>

  1671. 	<p class=desc>Output a waveform, and set the amplitude and frequency.

  1672. 	</p>

  1673. 	<p class=func><span class=keyword>frequency</span>(freq);</p>

  1674. 	<p class=desc>Change the frequency.

  1675. 	</p>

  1676. 	<p class=func><span class=keyword>amplitude</span>(level);</p>

  1677. 	<p class=desc>Change the amplitude.  Set to 0 to turn the signal off.

  1678. 	</p>

  1679. 	<p class=func><span class=keyword>phase</span>(angle);</p>

  1680. 	<p class=desc>

  1681. 		Cause the generated waveform to jump to a specific point within

  1682. 		its cycle.  Angle is from 0 to 360 degrees.  When multiple objects

  1683. 		are configured,

  1684. 		<a href="http://www.pjrc.com/teensy/td_libs_AudioProcessorUsage.html" target="_blank">AudioNoInterrupts()</a>

  1685. 		should be used to guarantee all new settings take effect together.

  1686. 	</p>

  1687. 	<p class=func><span class=keyword>pulseWidth</span>(amount);</p>

  1688. 	<p class=desc>Change the width (duty cycle) of the pulse.</p>

  1689. 	<p class=func><span class=keyword>arbitraryWaveform</span>(array, maxFreq);</p>

  1690. 	<p class=desc>

  1691. 		Configure the waveform to be used with WAVEFORM_ARBITRARY.  Array

  1692. 		must be an array of 256 samples.  Currently, the data is used

  1693. 		without any filtering, which can cause aliasing with frequencies

  1694. 		above 172 Hz.  For higher frequency output, you must bandwidth

  1695. 		limit your waveform data.  Someday, "maxFreq" will be used to

  1696. 		do this automatically.

  1697. 	</p>

  1698. 	<h3>Examples</h3>

  1699. 	<p class=exam>File &gt; Examples &gt; Audio &gt; Synthesis &gt; PlaySynthMusic

  1700. 	</p>

  1701. 	<p class=exam>File &gt; Examples &gt; Audio &gt; Synthesis &gt; pulseWidth

  1702. 	</p>

  1703. 	<p class=exam>File &gt; Examples &gt; Audio &gt; HardwareTesting &gt; WM8731MikroSine

  1704. 	</p>

  1705. 	<h3>Notes</h3>

  1706. 	<p>Supported Waveforms:<br>

  1707. 		<ul>

  1708. 		<li><span class=literal>WAVEFORM_SINE</span></li>

  1709. 		<li><span class=literal>WAVEFORM_SAWTOOTH</span></li>

  1710. 		<li><span class=literal>WAVEFORM_SAWTOOTH_REVERSE</span></li>

  1711. 		<li><span class=literal>WAVEFORM_SQUARE</span></li>

  1712. 		<li><span class=literal>WAVEFORM_TRIANGLE</span></li>

  1713. 		<li><span class=literal>WAVEFORM_ARBITRARY</span></li>

  1714. 		<li><span class=literal>WAVEFORM_PULSE</span></li>

  1715. 		<li><span class=literal>WAVEFORM_SAMPLE_HOLD</span></li>

  1716. 		</ul>

  1717. 	</p>

  1718. </script>

  1719. <script type="text/x-red" data-template-name="AudioSynthWaveform">

  1720. 	<div class="form-row">

  1721. 		<label for="node-input-name"><i class="fa fa-tag"></i> Name</label>

  1722. 		<input type="text" id="node-input-name" placeholder="Name">

  1723. 	</div>

  1724. </script>

  1725. 

  1726. <script type="text/x-red" data-help-name="AudioSynthToneSweep">

  1727. 	<h3>Summary</h3>

  1728. 	<div class=tooltipinfo>

  1729. 	<p>Create a continuously varying (in frequency) sine wave</p>

  1730. 	</div>

  1731. 	<h3>Audio Connections</h3>

  1732. 	<table class=doc align=center cellpadding=3>

  1733. 		<tr class=top><th>Port</th><th>Purpose</th></tr>

  1734. 		<tr class=odd><td align=center>Out 0</td><td>Continuously varying tone</td></tr>

  1735. 	</table>

  1736. 	<h3>Functions</h3>

  1737. 	<p class=func><span class=keyword>play</span>(level, lowFreq, highFreq, time);</p>

  1738. 	<p class=desc>Start generating frequency sweep output.  The time is specified

  1739. 		in milliseconds.  Level is 0 to 1.0.

  1740. 	</p>

  1741. 	<p class=func><span class=keyword>isPlaying</span>();</p>

  1742. 	<p class=desc>Returns true (non-zero) while the output is active.

  1743. 	</p>

  1744. 	<h3>Examples</h3>

  1745. 	<p class=exam>File &gt; Examples &gt; Audio &gt; HardwareTesting &gt; ToneSweep

  1746. 	</p>

  1747. 	<h3>Notes</h3>

  1748. 	<p>Uses excessive CPU time</p>

  1749. </script>

  1750. <script type="text/x-red" data-template-name="AudioSynthToneSweep">

  1751. 	<div class="form-row">

  1752. 		<label for="node-input-name"><i class="fa fa-tag"></i> Name</label>

  1753. 		<input type="text" id="node-input-name" placeholder="Name">

  1754. 	</div>

  1755. </script>

  1756. 

  1757. <script type="text/x-red" data-help-name="AudioSynthWaveformDc">

  1758. 	<h3>Summary</h3>

  1759. 	<div class=tooltipinfo>

  1760. 	<p>Create constant (DC) signal, useful for control of objects that take

  1761. 		a modulation or control input signal.  This constant level can be

  1762. 		used to modify other waveforms using mixer or multiplier objects</p>

  1763. 	</div>

  1764. 	<h3>Audio Connections</h3>

  1765. 	<table class=doc align=center cellpadding=3>

  1766. 		<tr class=top><th>Port</th><th>Purpose</th></tr>

  1767. 		<tr class=odd><td align=center>Out 0</td><td>Output constant DC level</td></tr>

  1768. 	</table>

  1769. 	<h3>Functions</h3>

  1770. 	<p class=func><span class=keyword>amplitude</span>(level);</p>

  1771. 	<p class=desc>Set the output.  Level is -1.0 to 1.0.  The output is

  1772. 		changed immediately.

  1773. 	</p>

  1774. 	<p class=func><span class=keyword>amplitude</span>(level, milliseconds);</p>

  1775. 	<p class=desc>Set the output.  Level is -1.0 to 1.0.  The output is

  1776. 		gradually changed over a "milliseconds" time period.  Any time may

  1777. 		be specified, but periods longer than 1 second may be automatically

  1778. 		shortened for small level changes, due to numerical precision limits.

  1779. 	</p>

  1780. 	<!--

  1781. <h3>Examples</h3>

  1782. 	<p class=exam>File &gt; Examples &gt; Audio &gt;

  1783. 	</p>

  1784. -->

  1785. 	<h3>Notes</h3>

  1786. 	<p>Of course, the term "DC", for Direct Current, doesn't properly apply

  1787. 		to a pure digital stream of numerical values.  But the term is widely

  1788. 		understood in audio applications, so hopefully it's not too confusing?</p>

  1789. </script>

  1790. <script type="text/x-red" data-template-name="AudioSynthWaveformDc">

  1791. 	<div class="form-row">

  1792. 		<label for="node-input-name"><i class="fa fa-tag"></i> Name</label>

  1793. 		<input type="text" id="node-input-name" placeholder="Name">

  1794. 	</div>

  1795. </script>

  1796. 

  1797. <script type="text/x-red" data-help-name="AudioSynthNoiseWhite">

  1798. 	<h3>Summary</h3>

  1799. 	<div class=tooltipinfo>

  1800. 	<p>Create white noise.

  1801. 		</p>

  1802. 	<p align=center><img src="img/whitenoise.png"></p>

  1803. 	</div>

  1804. 	<h3>Audio Connections</h3>

  1805. 	<table class=doc align=center cellpadding=3>

  1806. 		<tr class=top><th>Port</th><th>Purpose</th></tr>

  1807. 		<tr class=odd><td align=center>Out 0</td><td>White Noise</td></tr>

  1808. 	</table>

  1809. 	<h3>Functions</h3>

  1810. 	<p class=func><span class=keyword>amplitude</span>(level);</p>

  1811. 	<p class=desc>Set the output peak level, from 0 (off) to 1.0.

  1812. 		The default is off.  Noise is generated only after setting

  1813. 		to a non-zero level.

  1814. 	</p>

  1815. 	<h3>Examples</h3>

  1816. 	<p class=exam>File &gt; Examples &gt; Audio &gt;

  1817. 	</p>

  1818. 	<h3>Notes</h3>

  1819. 	<p>Setting the amplitude to zero causes this object to stop using

  1820. 		CPU time to generate random numbers.

  1821. 	</p>

  1822. </script>

  1823. <script type="text/x-red" data-template-name="AudioSynthNoiseWhite">

  1824. 	<div class="form-row">

  1825. 		<label for="node-input-name"><i class="fa fa-tag"></i> Name</label>

  1826. 		<input type="text" id="node-input-name" placeholder="Name">

  1827. 	</div>

  1828. </script>

  1829. 

  1830. <script type="text/x-red" data-help-name="AudioSynthNoisePink">

  1831. 	<h3>Summary</h3>

  1832. 	<div class=tooltipinfo>

  1833. 	<p>Create pink noise, using Stefan Stenzel's "New Shade Of Pink" algorithm.

  1834. 		</p>

  1835. 	<!--

  1836. <p align=center><img src="img/whitenoise.png"></p>

  1837. -->

  1838. 	</div>

  1839. 	<h3>Audio Connections</h3>

  1840. 	<table class=doc align=center cellpadding=3>

  1841. 		<tr class=top><th>Port</th><th>Purpose</th></tr>

  1842. 		<tr class=odd><td align=center>Out 0</td><td>Pink Noise</td></tr>

  1843. 	</table>

  1844. 	<h3>Functions</h3>

  1845. 	<p class=func><span class=keyword>amplitude</span>(level);</p>

  1846. 	<p class=desc>Set the output peak level, from 0 (off) to 1.0.

  1847. 		The default is off.  Noise is generated only after setting

  1848. 		to a non-zero level.

  1849. 	</p>

  1850. 	<h3>Examples</h3>

  1851. 	<p class=exam>File &gt; Examples &gt; Audio &gt; MemoryAndCpuUsage

  1852. 	</p>

  1853. 	<h3>Notes</h3>

  1854. 	<p>Setting the amplitude to zero causes this object to stop using

  1855. 		CPU time.  CPU usage is approx 3% on Teensy 3.1.

  1856. 	</p>

  1857. 	<p>Stefan Stenzel's

  1858. 		<a href="http://stenzel.waldorfmusic.de/post/pink/" target="_blank">New Shade Of Pink</a>

  1859. 		algorithm.  Stefan's terms of use are "Use for any purpose. If used

  1860. 		in a commercial product, you should give me one."

  1861. 	</p>

  1862. </script>

  1863. <script type="text/x-red" data-template-name="AudioSynthNoisePink">

  1864. 	<div class="form-row">

  1865. 		<label for="node-input-name"><i class="fa fa-tag"></i> Name</label>

  1866. 		<input type="text" id="node-input-name" placeholder="Name">

  1867. 	</div>

  1868. </script>

  1869. 

  1870. <script type="text/x-red" data-help-name="AudioEffectFade">

  1871. 	<h3>Summary</h3>

  1872. 	<div class=tooltipinfo>

  1873. 	<p>Gradually increase or decrease audio level.</p>

  1874. 	</div>

  1875. 	<h3>Audio Connections</h3>

  1876. 	<table class=doc align=center cellpadding=3>

  1877. 		<tr class=top><th>Port</th><th>Purpose</th></tr>

  1878. 		<tr class=odd><td align=center>In 0</td><td>Signal Input</td></tr>

  1879. 		<tr class=odd><td align=center>Out 0</td><td>Signal Output</td></tr>

  1880. 	</table>

  1881. 	<h3>Functions</h3>

  1882. 	<p class=func><span class=keyword>fadeIn</span>(milliseconds);</p>

  1883. 	<p class=desc>Begin increasing the audio level, to reach 1.0 (input passed

  1884. 		directly to the output) after "milliseconds" time.

  1885. 	</p>

  1886. 	<p class=func><span class=keyword>fadeOut</span>(milliseconds);</p>

  1887. 	<p class=desc>Begin decreasing the audio level, to reach 0 (no output)

  1888. 		after "milliseconds" time.

  1889. 	</p>

  1890. 	<!--

  1891. <h3>Examples</h3>

  1892. 	<p class=exam>File &gt; Examples &gt; Audio &gt;

  1893. 	</p>

  1894. -->

  1895. 	<h3>Notes</h3>

  1896. 	<p>Cross fading can be built with 2 fade objects fed into a mixer.

  1897. 		When one fade object is off (fully faded out) and the other on

  1898. 		(fully faded in), if both are started at the same moment for the

  1899. 		same time duration, their signal gains always add to 1.0.  This

  1900. 		allows 2 fade objects to work together for a smooth transition

  1901. 		between a pair of signals.

  1902. 	</p>

  1903. 	<p><a href="http://www.pjrc.com/teensy/td_libs_AudioProcessorUsage.html" target="_blank">AudioNoInterrupts()</a>

  1904. 		should be used when changing

  1905. 		settings on multiple objects, so all changes always take effect

  1906. 		at the same moment.

  1907. 	</p>

  1908. </script>

  1909. <script type="text/x-red" data-template-name="AudioEffectFade">

  1910. 	<div class="form-row">

  1911. 		<label for="node-input-name"><i class="fa fa-tag"></i> Name</label>

  1912. 		<input type="text" id="node-input-name" placeholder="Name">

  1913. 	</div>

  1914. </script>

  1915. 

  1916. <script type="text/x-red" data-help-name="AudioEffectChorus">

  1917. <h3>Summary</h3>

  1918. 	<div class=tooltipinfo>

  1919. 	<p>The chorus effect simulates the richness of several nearly-identical

  1920. 	sound sources (like the way a choir sounds different to a single singer).

  1921. 	It does this by sampling from a delay line, so each voice is actually

  1922. 	the same but at a slightly different point in time. This is a type of

  1923. 	comb filtering.</p>

  1924. 	</div>

  1925. 	<p>Chorus combines one or more samples ranging from the most recent

  1926. 	sample back to about 50ms ago. The additional samples are evenly spread

  1927. 	through the supplied delay line, and there is no modulation.</p>

  1928. 	<p>If the number of voices is specified as 2, then the

  1929. 	effect combines the current sample and the oldest sample (the last one

  1930. 	in the delay line). If the number of voices is 3 then the effect combines

  1931. 	the most recent sample, the oldest sample and the sample in the middle of

  1932. 	the delay line.</p>

  1933. 	<p>For two voices the effect can be represented as:<br/>

  1934. 	result = (sample(0) + sample(dt))/2<br/>

  1935. 	where sample(0) represents the current sample and sample(dt)

  1936. 	is the sample in the delay line from dt milliseconds ago.</p>

  1937. 	<h3>Audio Connections</h3>

  1938. 	<table class=doc align=center cellpadding=3>

  1939. 		<tr class="top"><th>Port</th><th>Purpose</th></tr>

  1940. 		<tr class="odd"><td align="center">In 0</td><td>Signal Input</td></tr>

  1941. 		<tr class="odd"><td align="center">Out 0</td><td>Chorused Output</td></tr>

  1942. 	</table>

  1943. 	<h3>Functions</h3>

  1944. 	<p class=func><span class=keyword>begin</span>(delayBuffer, length, n_chorus);</p>

  1945. 	<p class=desc>Create a chorus by specifying the address of the delayline, the

  1946. 	total number of samples in the delay line (often done as an integer multiple of

  1947. 	AUDIO_BLOCK_SAMPLES) and the number of voices in the chorus <em>including</em>

  1948. 	the original voice (so, 2 and up to get a chorus effect, although you can

  1949. 	specify 1 if you want).

  1950. 	</p>

  1951. 	<p class=func><span class=keyword>modify</span>(n_chorus);</p>

  1952. 	<p class=desc>Alters the number of voices in a running chorus (previously started with begin).

  1953. 	</p>

  1954. 	<h3>Examples</h3>

  1955. 	<p class=exam>File &gt; Examples &gt; Audio &gt; Effects &gt; Chorus

  1956. 	</p>

  1957. 	<h3>Notes</h3>

  1958. 	<p>The longer the length of the chorus, the more memory blocks are used.</p>

  1959. </script>

  1960. <script type="text/x-red" data-template-name="AudioEffectChorus">

  1961. 	<div class="form-row">

  1962. 		<label for="node-input-name"><i class="fa fa-tag"></i> Name</label>

  1963. 		<input type="text" id="node-input-name" placeholder="Name">

  1964. 	</div>

  1965. </script>

  1966. 

  1967. <script type="text/x-red" data-help-name="AudioEffectFlange">

  1968. <h3>Summary</h3>

  1969. 	<div class=tooltipinfo>

  1970. 	<p>Originally, flanging was produced by playing the same signal on two synchronized

  1971. 	reel-to-reel tape recorders and making one of the reels slow down and speed up by

  1972. 	pressing on the flange of the reel (hence the name). This is a type of

  1973. 	comb filtering, and produces a harmonically-related series of peaks and notches

  1974. 	in the audio spectrum.</p>

  1975. 	</div>

  1976. 	<p>This flanger uses a delay line, combining the original voice with only one sample from the delay

  1977. 	line, but the position of that sample varies sinusoidally.</p>

  1978. 	<p>The effect can be represented as:<br>

  1979. 	result = sample(0) + sample(dt + depth*sin(2*PI*Fe))</p>

  1980. 	<p>The value of the sine function is always a number from -1 to +1 and

  1981. 	so the result of depth*(sin(Fe)) is always a number from -depth to +depth.

  1982. 	Thus, the delayed sample will be selected from the range (dt-depth) to

  1983. 	(dt+depth). This selection will vary at whatever rate is specified as the

  1984. 	frequency of the effect, Fe. Typically a low frequency (a few Hertz) is used.

  1985. 	<h3>Audio Connections</h3>

  1986. 	<table class=doc align=center cellpadding=3>

  1987. 		<tr class="top"><th>Port</th><th>Purpose</th></tr>

  1988. 		<tr class="odd"><td align="center">In 0</td><td>Signal Input</td></tr>

  1989. 		<tr class="odd"><td align="center">Out 0</td><td>Flanged Output</td></tr>

  1990. 	</table>

  1991. 	<h3>Functions</h3>

  1992. 	<p class=func><span class=keyword>begin</span>(delayBuffer, length, offset, depth, delayRate);</p>

  1993. 	<p class=desc>Create a flanger by specifying the address of the delayline, the

  1994. 	total number of samples in the delay line (often done as an integer multiple of

  1995. 	AUDIO_BLOCK_SAMPLES), the offset (how far back the flanged sample is from the original voice),

  1996. 	the modulation depth (larger values give a greater variation) and the modulation

  1997. 	frequency, in Hertz.

  1998. 	</p>

  1999. 	<p class=func><span class=keyword>voices</span>(offset, depth, delayRate);</p>

  2000. 	<p class=desc>Alters the parameters in a running flanger (previously started with begin).

  2001. 	</p>

  2002. 

  2003. 	<h3>Examples</h3>

  2004. 	<p class=exam>File &gt; Examples &gt; Audio &gt; Effects &gt; Flange

  2005. 	</p>

  2006. 	<h3>Notes</h3>

  2007. 	<p>The longer the length of the delay buffer, the more memory blocks are used.</p>

  2008. 	<p>Try these settings:<br>

  2009. #define FLANGE_DELAY_LENGTH (2*AUDIO_BLOCK_SAMPLES)<br>

  2010. and<br>

  2011. int s_idx = 2*FLANGE_DELAY_LENGTH/4;<br>

  2012. int s_depth = FLANGE_DELAY_LENGTH/4;<br>

  2013. double s_freq = 3;</p>

  2014. <p>The flange effect can also produce a chorus-like effect if a longer

  2015. delay line is used with a slower modulation rate, for example try:<br>

  2016. #define FLANGE_DELAY_LENGTH (12*AUDIO_BLOCK_SAMPLES)<br>

  2017. and<br>

  2018. int s_idx = 3*FLANGE_DELAY_LENGTH/4;<br>

  2019. int s_depth = FLANGE_DELAY_LENGTH/8;<br>

  2020. double s_freq = .0625;</p>

  2021. </script>

  2022. <script type="text/x-red" data-template-name="AudioEffectFlange">

  2023. 	<div class="form-row">

  2024. 		<label for="node-input-name"><i class="fa fa-tag"></i> Name</label>

  2025. 		<input type="text" id="node-input-name" placeholder="Name">

  2026. 	</div>

  2027. </script>

  2028. 

  2029. <script type="text/x-red" data-help-name="AudioEffectEnvelope">

  2030. 	<h3>Summary</h3>

  2031. 	<div class=tooltipinfo>

  2032. 	<p>Modify a signal with a DAHDSR (Delay Attack Hold Decay Sustain

  2033. 		Release) envelope.

  2034. 	</p>

  2035. 	<p align=center><img src="img/dahdsr.png"></p>

  2036. 	</div>

  2037. 	<h3>Audio Connections</h3>

  2038. 	<table class=doc align=center cellpadding=3>

  2039. 		<tr class=top><th>Port</th><th>Purpose</th></tr>

  2040. 		<tr class=odd><td align=center>In 0</td><td>Signal Input</td></tr>

  2041. 		<tr class=odd><td align=center>Out 0</td><td>Signal with Envelope Applied</td></tr>

  2042. 	</table>

  2043. 	<h3>Functions</h3>

  2044. 	<p class=func><span class=keyword>noteOn</span>();</p>

  2045. 	<p class=desc>Begin the delay to attack, or the attack phase is

  2046. 		delay is zero.

  2047. 	</p>

  2048. 	<p class=func><span class=keyword>noteOff</span>();</p>

  2049. 	<p class=desc>Begin the release phase.

  2050. 	</p>

  2051. 	<p class=func><span class=keyword>delay</span>(milliseconds);</p>

  2052. 	<p class=desc>Set the delay from noteOn to the attach phase.  The

  2053. 		default is zero, for no delay.

  2054. 	</p>

  2055. 	<p class=func><span class=keyword>attack</span>(milliseconds);</p>

  2056. 	<p class=desc>Set the attack time.  The default is 1.5 milliseconds.

  2057. 	</p>

  2058. 	<p class=func><span class=keyword>hold</span>(milliseconds);</p>

  2059. 	<p class=desc>Set the hold time.  The default is 0.5 milliseconds.

  2060. 	</p>

  2061. 	<p class=func><span class=keyword>decay</span>(milliseconds);</p>

  2062. 	<p class=desc>Set the decay time.  The default is 15 milliseconds.

  2063. 	</p>

  2064. 	<p class=func><span class=keyword>sustain</span>(level);</p>

  2065. 	<p class=desc>Set the sustain level.  The range is 0 to 1.0.  The

  2066. 		gain will be maintained at this level after the decay phase,

  2067. 		until noteOff() is called.

  2068. 	</p>

  2069. 	<p class=func><span class=keyword>release</span>(milliseconds);</p>

  2070. 	<p class=desc>Set the release time.  The default is 30 millisecond.

  2071. 	</p>

  2072. 	<h3>Examples</h3>

  2073. 	<p class=exam>File &gt; Examples &gt; Audio &gt; Synthesis &gt; PlaySynthMusic

  2074. 	</p>

  2075. 	<p class=exam>File &gt; Examples &gt; Audio &gt; Synthesis &gt; pulseWidth

  2076. 	</p>

  2077. 	<p class=exam>File &gt; Examples &gt; Audio &gt; MemoryAndCpuUsage

  2078. 	</p>

  2079. 	<h3>Notes</h3>

  2080. 	<p>To achieve the more common ADSR shape, simply

  2081.         set delay and hold to zero.</p>

  2082. 	<p>The recommended range for each of the 5 timing inputs is 0 to 50

  2083. 		milliseconds.  Up to 200 ms can be used, with somewhat reduced

  2084. 		accuracy</p>

  2085. </script>

  2086. <script type="text/x-red" data-template-name="AudioEffectEnvelope">

  2087. 	<div class="form-row">

  2088. 		<label for="node-input-name"><i class="fa fa-tag"></i> Name</label>

  2089. 		<input type="text" id="node-input-name" placeholder="Name">

  2090. 	</div>

  2091. </script>

  2092. 

  2093. <script type="text/x-red" data-help-name="AudioEffectMultiply">

  2094. 	<h3>Summary</h3>

  2095. 	<div class=tooltipinfo>

  2096. 	<p>Multiply two signals together, useful for amplitude modulation

  2097. 		or "voltage controlled amplification".

  2098. 	</p>

  2099. 	<p align=center><img src="img/multiply.png"><br><small>56 Hz and 1 kHz sine waves multiplied.</small></p>

  2100. 	</div>

  2101. 	<h3>Audio Connections</h3>

  2102. 	<table class=doc align=center cellpadding=3>

  2103. 		<tr class=top><th>Port</th><th>Purpose</th></tr>

  2104. 		<tr class=odd><td align=center>In 0</td><td>Signal Input</td></tr>

  2105. 		<tr class=odd><td align=center>In 1</td><td>Signal Input</td></tr>

  2106. 		<tr class=odd><td align=center>Out 0</td><td>Signal with Envelope Applied</td></tr>

  2107. 	</table>

  2108. 	<h3>Functions</h3>

  2109. 	<p>There are no functions to call from the Arduino sketch.

  2110. 		This object simply multiplies the 2 signals to create

  2111. 		a continuous output

  2112. 	</p>

  2113. 	<!--

  2114. <h3>Examples</h3>

  2115. 	<p class=exam>File &gt; Examples &gt; Audio &gt;

  2116. 	</p>

  2117. -->

  2118. 	<h3>Notes</h3>

  2119. 	<p>

  2120.     </p>

  2121. </script>

  2122. <script type="text/x-red" data-template-name="AudioEffectMultiply">

  2123. 	<div class="form-row">

  2124. 		<label for="node-input-name"><i class="fa fa-tag"></i> Name</label>

  2125. 		<input type="text" id="node-input-name" placeholder="Name">

  2126. 	</div>

  2127. </script>

  2128. 

  2129. <script type="text/x-red" data-help-name="AudioEffectDelay">

  2130. 	<h3>Summary</h3>

  2131. 	<div class=tooltipinfo>

  2132. 	<p>Delay a signal.  Up to 8 separate delay taps can be used.</p>

  2133. 	<p align=center><img src="img/delay.png"><br><small>1 kHz burst, delayed 5.2 ms.</small></p>

  2134. 	</div>

  2135. 	<h3>Audio Connections</h3>

  2136. 	<table class=doc align=center cellpadding=3>

  2137. 		<tr class=top><th>Port</th><th>Purpose</th></tr>

  2138. 		<tr class=odd><td align=center>In 0</td><td>Signal Input</td></tr>

  2139. 		<tr class=odd><td align=center>Out 0</td><td>Delay Tap #1</td></tr>

  2140. 		<tr class=odd><td align=center>Out 1</td><td>Delay Tap #2</td></tr>

  2141. 		<tr class=odd><td align=center>Out 2</td><td>Delay Tap #3</td></tr>

  2142. 		<tr class=odd><td align=center>Out 3</td><td>Delay Tap #4</td></tr>

  2143. 		<tr class=odd><td align=center>Out 4</td><td>Delay Tap #5</td></tr>

  2144. 		<tr class=odd><td align=center>Out 5</td><td>Delay Tap #6</td></tr>

  2145. 		<tr class=odd><td align=center>Out 6</td><td>Delay Tap #7</td></tr>

  2146. 		<tr class=odd><td align=center>Out 7</td><td>Delay Tap #8</td></tr>

  2147. 	</table>

  2148. 	<h3>Functions</h3>

  2149. 	<p class=func><span class=keyword>delay</span>(channel, milliseconds);</p>

  2150. 	<p class=desc>Set output channel (0 to 7) to delay the signals by

  2151. 		milliseconds.  The maximum delay is approx 425 ms.  The actual delay

  2152. 		is rounded to the nearest sample.  Each channel can be configured for

  2153. 		any delay.  There is no requirement to configure the "taps" in increasing

  2154. 		delay order.

  2155. 	</p>

  2156. 	<p class=func><span class=keyword>disable</span>(channel);</p>

  2157. 	<p class=desc>Disable a channel.  The output of this channel becomes

  2158. 		silent.  If this channel is the longest delay, memory usage is

  2159. 		automatically reduced to accomodate only the remaining channels used.

  2160. 	</p>

  2161. 	<h3>Examples</h3>

  2162. 	<p class=exam>File &gt; Examples &gt; Audio &gt; Effects &gt; Delay

  2163. 	</p>

  2164. 	<h3>Notes</h3>

  2165. 	<p>Memory for the delayed signal is take from the memory pool allocated by

  2166. 		<a href="http://www.pjrc.com/teensy/td_libs_AudioConnection.html" target="_blank">AudioMemory()</a>.

  2167. 		Each block allows about 3 milliseconds of delay, so AudioMemory

  2168. 		should be increased to allow for the longest delay tap.

  2169. 	</p>

  2170. </script>

  2171. <script type="text/x-red" data-template-name="AudioEffectDelay">

  2172. 	<div class="form-row">

  2173. 		<label for="node-input-name"><i class="fa fa-tag"></i> Name</label>

  2174. 		<input type="text" id="node-input-name" placeholder="Name">

  2175. 	</div>

  2176. </script>

  2177. 

  2178. <script type="text/x-red" data-help-name="AudioEffectDelayExternal">

  2179. 	<h3>Summary</h3>

  2180. 	<div class=tooltipinfo>

  2181. 	<p>Delay a signal, using external memory for longer delay times!  Up to 8 separate delay taps can be used.</p>

  2182. 	<p align=center><img src="img/delay.png"><br><small>1 kHz burst, delayed 5.2 ms.</small></p>

  2183. 	</div>

  2184. 	<h3>Audio Connections</h3>

  2185. 	<table class=doc align=center cellpadding=3>

  2186. 		<tr class=top><th>Port</th><th>Purpose</th></tr>

  2187. 		<tr class=odd><td align=center>In 0</td><td>Signal Input</td></tr>

  2188. 		<tr class=odd><td align=center>Out 0</td><td>Delay Tap #1</td></tr>

  2189. 		<tr class=odd><td align=center>Out 1</td><td>Delay Tap #2</td></tr>

  2190. 		<tr class=odd><td align=center>Out 2</td><td>Delay Tap #3</td></tr>

  2191. 		<tr class=odd><td align=center>Out 3</td><td>Delay Tap #4</td></tr>

  2192. 		<tr class=odd><td align=center>Out 4</td><td>Delay Tap #5</td></tr>

  2193. 		<tr class=odd><td align=center>Out 5</td><td>Delay Tap #6</td></tr>

  2194. 		<tr class=odd><td align=center>Out 6</td><td>Delay Tap #7</td></tr>

  2195. 		<tr class=odd><td align=center>Out 7</td><td>Delay Tap #8</td></tr>

  2196. 	</table>

  2197. 	<h3>Functions</h3>

  2198. 	<p class=func><span class=keyword>delay</span>(channel, milliseconds);</p>

  2199. 	<p class=desc>Set output channel (0 to 7) to delay the signals by

  2200. 		milliseconds.  The maximum delay is approx 1.5 seconds for each 23LC1024 chip.

  2201. 		The actual delay

  2202. 		is rounded to the nearest sample.  Each channel can be configured for

  2203. 		any delay.  There is no requirement to configure the "taps" in increasing

  2204. 		delay order.

  2205. 	</p>

  2206. 	<p class=func><span class=keyword>disable</span>(channel);</p>

  2207. 	<p class=desc>Disable a channel.  The output of this channel becomes

  2208. 		silent.  If this channel is the longest delay, memory usage is

  2209. 		automatically reduced to accomodate only the remaining channels used.

  2210. 	</p>

  2211. 	<h3>Hardware</h3>

  2212. 	<p>By default, or when <span class=literal>AUDIO_MEMORY_23LC1024</span> is used (see below),

  2213. 		 a single 23LC1024 RAM chip is used, with these pins:

  2214.     <table class=doc align=center cellpadding=3>

  2215.         <tr class=top><th>Pin</th><th>Signal</th></tr>

  2216.         <tr class=odd><td align=center>6</td><td>CS</td></tr>

  2217.         <tr class=odd><td align=center>7</td><td>MOSI</td></tr>

  2218.         <tr class=odd><td align=center>12</td><td>MISO</td></tr>

  2219.         <tr class=odd><td align=center>14</td><td>SCK</td></tr>

  2220.     </table>

  2221. 	</p>

  2222. 	<p>When <span class=literal>AUDIO_MEMORY_MEMORYBOARD</span> is used, up to six

  2223. 		23LC1024 chips are used.

  2224. 	</p>

  2225. 	<p align=center><img src="img/memoryboard.jpg"><br><small><a href="https://oshpark.com/shared_projects/KZt5PaU7" target="_blank">Memoryboard 4</a></small></p>

  2226. 	<p>

  2227.     <table class=doc align=center cellpadding=3>

  2228.         <tr class=top><th>Pin</th><th>Signal</th></tr>

  2229.         <tr class=odd><td align=center>2</td><td>CS0 (encoded)</td></tr>

  2230.         <tr class=odd><td align=center>3</td><td>CS1 (encoded)</td></tr>

  2231.         <tr class=odd><td align=center>4</td><td>CS2 (encoded)</td></tr>

  2232.         <tr class=odd><td align=center>7</td><td>MOSI</td></tr>

  2233.         <tr class=odd><td align=center>12</td><td>MISO</td></tr>

  2234.         <tr class=odd><td align=center>14</td><td>SCK</td></tr>

  2235.     </table>

  2236. 	</p>

  2237. 	<p>

  2238. 	If fewer than 6 chips are soldered, the optional parameter for maximum delay

  2239. 	must be used.  See below for details.  Each chip provides 1485 ms of delay

  2240. 	memory, so the total of all objects using AUDIO_MEMORY_MEMORYBOARD must not

  2241. 	exceed the amount of memory physically present.

  2242. 	</p>

  2243. 	<h3>Examples</h3>

  2244. 	<p>

  2245. 	<a href="https://www.youtube.com/watch?v=d80d1HWy5_s" target="_blank">Demo Video</a> (YouTube)

  2246. 	</p>

  2247. 	<!--

  2248.  <p class=exam>File &gt; Examples &gt; Audio &gt; Effects &gt; Delay

  2249. 	</p>

  2250. -->

  2251. 	<p>

  2252. 	<a href="https://forum.pjrc.com/threads/29276-Limits-of-delay-effect-in-audio-library?p=79436&viewfull=1#post79436" target="_blank">Forum Conversaton</a> (with sample code)

  2253. 	</p>

  2254. 	<h3>Notes</h3>

  2255. 	<p>External RAM allows for longer delays without consuming

  2256. 		limited internal RAM.  However, SPI communication is required,

  2257. 		which consumes much more CPU time.  The

  2258. 		<a href="http://www.pjrc.com/teensy/td_libs_AudioProcessorUsage.html">AudioProcessorUsageMax</a>

  2259. 		function may be used to monitor how much CPU time is consumed.

  2260. 	</p>

  2261. 	<p>You may specify the type of hardware to be used by editing the code.  AUDIO_MEMORY_23LC1024

  2262. 		specifies a single 23LC1024 chip.  AUDIO_MEMORY_MEMORYBOARD allows using up to 6 of these

  2263. 		chips.

  2264. 	</p>

  2265. 	<p class=desc><span class=keyword>AudioEffectDelayExternal</span>  delayExt1(<span class=literal>AUDIO_MEMORY_23LC1024</span>);

  2266. 	</p>

  2267. 	<p>You may also create more than one delay using the same hardware, where the memory is partitioned

  2268. 		by specifying a maximum delay in milliseconds.  This can be useful if you wish to delay both

  2269. 		channels of a stereo signal.

  2270. 

  2271. 	<p class=desc><span class=keyword>AudioEffectDelayExternal</span>  delayExt1(<span class=literal>AUDIO_MEMORY_23LC1024</span>, 700);<br><span class=keyword>AudioEffectDelayExternal</span>  delayExt2(<span class=literal>AUDIO_MEMORY_23LC1024</span>, 700);

  2272. 	</p>

  2273. </script>

  2274. <script type="text/x-red" data-template-name="AudioEffectDelayExternal">

  2275. 	<div class="form-row">

  2276. 		<label for="node-input-name"><i class="fa fa-tag"></i> Name</label>

  2277. 		<input type="text" id="node-input-name" placeholder="Name">

  2278. 	</div>

  2279. </script>

  2280. 

  2281. <script type="text/x-red" data-help-name="AudioEffectBitcrusher">

  2282.     <h3>Summary</h3>

  2283. 	<div class=tooltipinfo>

  2284.     <p>Reduce the samplerate and/or bitdepth of a source signal, resulting in

  2285. 		a distorted sound.</p>

  2286. 	</div>

  2287.     <h3>Audio Connections</h3>

  2288.     <table class=doc align=center cellpadding=3>

  2289.         <tr class=top><th>Port</th><th>Purpose</th></tr>

  2290.         <tr class=odd><td align=center>In 0</td><td>Signal Input</td></tr>

  2291.         <tr class=odd><td align=center>Out 0</td><td>Signal Output</td></tr>

  2292.     </table>

  2293.     <h3>Functions</h3>

  2294.     <p class=func><span class=keyword>bits</span>(xcrushBits);</p>

  2295.     <p class=desc>xcrushBits sets the bitdepth, from 1 to 16. A Value of 16

  2296.     does not crush the bitdepth, and is effectively a passthru for this part

  2297.     of the function.</p>

  2298. 

  2299.     <p class=func><span class=keyword>sampleRate</span>(xsampleRate);</p>

  2300. 

  2301.     <p class=desc>xsampleRate sets the frequency, from 1 to 44100Hz, however it

  2302.     works in integer steps so you will only really get a handful of results from

  2303.     the many samplerates you can pass. 44100 is passthru.</p>

  2304. 

  2305.     <p class=desc>set xbitDepth to 16 and xsampleRate to 44100 to pass audio

  2306.     	through without any Bitcrush effect.</p>

  2307.     <h3>Examples</h3>

  2308.     <p class=exam>File &gt; Examples &gt; Audio &gt; Effects &gt; Bitcrusher

  2309.     </p>

  2310.     <h3>Notes</h3>

  2311.     <p>Needs a lot of improvement. Options for anti-aliasing would be nice in

  2312.     the future, but for now, it's rough, it's dirty and it sounds a bit like

  2313.     Nine Inch Nails.

  2314.     </p>

  2315.     <p><a href="http://www.pjrc.com/teensy/td_libs_AudioProcessorUsage.html" target="_blank">AudioNoInterrupts()</a>

  2316.         should be used when changing

  2317.         settings on multiple objects, so all changes always take effect

  2318.         at the same moment.

  2319.     </p>

  2320. </script>

  2321. <script type="text/x-red" data-template-name="AudioEffectBitcrusher">

  2322.     <div class="form-row">

  2323.         <label for="node-input-name"><i class="fa fa-tag"></i> Name</label>

  2324.         <input type="text" id="node-input-name" placeholder="Name">

  2325.     </div>

  2326. </script>

  2327. 

  2328. <script type="text/x-red" data-help-name="AudioEffectMidSide">

  2329. 	<h3>Summary</h3>

  2330. 	<div class=tooltipinfo>

  2331. 	<p>Convert stereo signals to/from Mid-Side format.

  2332. 		Mid-Side encoding can be used to increase stereo width, make the lower

  2333. 		frequencies mono (to please your sub), or as the basis of audio compression.</p>

  2334. 	</div>

  2335. 	<h3>Audio Connections</h3>

  2336. 	<table class=doc align=center cellpadding=3>

  2337. 		<tr class=top><th>Port</th><th>While<br>Encoding</th><th>While<br>Decoding</th></tr>

  2338. 		<tr class=odd><td align=center>In 0</td><td>Left Input</td><td>Mid Output</td></tr>

  2339. 		<tr class=odd><td align=center>In 1</td><td>Right Input</td><td>Side Output</td></tr>

  2340. 		<tr class=odd><td align=center>Out 0</td><td>Mid Input</td><td>Left Output</td></tr>

  2341. 		<tr class=odd><td align=center>Out 1</td><td>Side Input</td><td>Right Output</td></tr>

  2342. 	</table>

  2343. 	<h3>Functions</h3>

  2344. 	<p class=func><span class=keyword>encode</span>();</p>

  2345. 	<p class=desc>Configure this object to encode from stereo to Mid-Side format.</p>

  2346. 	<p class=func><span class=keyword>decode</span>();</p>

  2347. 	<p class=desc>Configure this object to decode from Mid-Side format back to stereo signals.</p>

  2348. 

  2349. 	<h3>Examples</h3>

  2350. 	<p class=exam>File &gt; Examples &gt; Audio &gt; Effects &gt; Mid_Side</p>

  2351. 	<h3>Notes</h3>

  2352. 	<p>Many interesting stereo effects can be achieved by manipulating Mid-Side signals.</p>

  2353. 	<p>Normally a pair of these objects are used, one to encode, then additional

  2354. 		gain/attenuation or effects applied to the Mid-Side signals, and finally

  2355. 		decoding back to stereo signals</p>

  2356. 	<p>To prevent saturation, halving is done in the encoding, that is:</p>

  2357. 	<p>Mid = (left+right)/2</p>

  2358. 	<p>Side = (left-right)/2</p>

  2359. 	<p>And to decode:</p>

  2360. 	<p>Left = Mid+Side</p>

  2361. 	<p>Right = Mid-Side</p>

  2362. </script>

  2363. <script type="text/x-red" data-template-name="AudioEffectMidSide">

  2364.     <div class="form-row">

  2365.         <label for="node-input-name"><i class="fa fa-tag"></i> Name</label>

  2366.         <input type="text" id="node-input-name" placeholder="Name">

  2367.     </div>

  2368. </script>

  2369. 

  2370. <script type="text/x-red" data-help-name="AudioFilterBiquad">

  2371. 	<h3>Summary</h3>

  2372. 	<div class=tooltipinfo>

  2373. 	<p>Biquadratic cascaded filter, useful for all sorts of filtering.

  2374. 		Up to 4 stages may be cascaded.

  2375. 	</p>

  2376. 	<p align=center><img src="img/biquad.png"></p>

  2377. 	</div>

  2378. 	<h3>Audio Connections</h3>

  2379. 	<table class=doc align=center cellpadding=3>

  2380. 		<tr class=top><th>Port</th><th>Purpose</th></tr>

  2381. 		<tr class=odd><td align=center>In 0</td><td>Signal to be filtered</td></tr>

  2382. 		<tr class=odd><td align=center>Out 0</td><td>Filtered Signal Output</td></tr>

  2383. 	</table>

  2384. 	<h3>Functions</h3>

  2385. 	<p class=func><span class=keyword>setLowpass</span>(stage, frequency, Q);</p>

  2386. 	<p class=desc>Configure one stage of the filter (0 to 3) with low pass

  2387. 		response, with the specified corner frequency and Q shape.  If Q is

  2388. 		higher that 0.7071, be careful of filter gain (see below).

  2389. 	</p>

  2390. 	<p class=func><span class=keyword>setHighpass</span>(stage, frequency, Q);</p>

  2391. 	<p class=desc>Configure one stage of the filter (0 to 3) with high pass

  2392. 		response, with the specified corner frequency and Q shape.  If Q is

  2393. 		higher that 0.7071, be careful of filter gain (see below).

  2394. 	</p>

  2395. 	<p class=func><span class=keyword>setBandpass</span>(stage, frequency, Q);</p>

  2396. 	<p class=desc>Configure one stage of the filter (0 to 3) with band pass

  2397. 		response.  The filter has unity gain at the specified frequency.  Q

  2398. 		controls the width of frequencies allowed to pass.

  2399. 	</p>

  2400. 	<p class=func><span class=keyword>setNotch</span>(stage, frequency, Q);</p>

  2401. 	<p class=desc>Configure one stage of the filter (0 to 3) with band reject (notch)

  2402. 		response.  Q controls the width of rejected frequencies.

  2403. 	</p>

  2404. 	<p class=func><span class=keyword>setLowShelf</span>(stage, frequency, gain, slope);</p>

  2405. 	<p class=desc>Configure one stage of the filter (0 to 3) with low shelf response.

  2406. 		A low shelf filter attenuates or amplifies signals below the specified frequency.

  2407. 		Frequency controls the slope midpoint, gain is in dB and can be both

  2408. 		positive or negative. The slope parameter controls steepness of gain transition.

  2409. 		A slope of 1 yields maximum steepness without overshoot,

  2410. 		lower values yield a less steep slope. See the picture below for a visualization

  2411. 		of the slope parameter's effect.

  2412. 		Be careful with positive gains and slopes higher than 1 as they introduce gain

  2413. 		(see warning below).

  2414. 	</p>

  2415. 	</p>

  2416. 	<p class=func><span class=keyword>setHighShelf</span>(stage, frequency, gain, slope);</p>

  2417. 	<p class=desc>Configure one stage of the filter (0 to 3) with high shelf response.

  2418. 		A high shelf filter attenuates or amplifies signals above the specified frequency.

  2419. 		Frequency controls the slope midpoint, gain is in dB and can be both

  2420. 		positive or negative. The slope parameter controls steepness of gain transition.

  2421. 		A slope of 1 yields maximum steepness without overshoot,

  2422. 		lower values yield a less steep slope. See the picture below for a visualization

  2423. 		of the slope parameter's effect.

  2424. 		Be careful with positive gains and slopes higher than 1 as they introduce gain

  2425. 		(see warning below).

  2426. 	</p>

  2427. 	<p align=center><img src="img/shelf_filter.png"></p>

  2428. 	<p class=func><span class=keyword>setCoefficients</span>(stage, array[5]);</p>

  2429. 	<p class=desc>Configure one stage of the filter (0 to 3) with an arbitrary

  2430. 		filter response.  The array of coefficients is in order: B0, B1, B2, A1, A2.

  2431. 		Each coefficient must be less than 2.0 and greater than -2.0.  The array

  2432. 		should be type double.  Alternately, it may be type int, where 1.0 is

  2433. 		represented with 1073741824 (2<sup>30</sup>).

  2434. 	</p>

  2435. 	<h3>Examples</h3>

  2436. 	<p class=exam>File &gt; Examples &gt; Audio &gt; Effects &gt; Filter

  2437. 	</p>

  2438. 	<h3>Notes</h3>

  2439. 	<p>Filters can with gain must have their input signals attenuated, so the

  2440. 		signal does not exceed 1.0.

  2441. 	</p>

  2442. 	<p>This object implements up to 4 cascaded stages.  Unconfigured stages will

  2443. 		not pass any signal.

  2444. 	</p>

  2445. 	<p>Biquad filters with low corner frequency (under about 400 Hz) can run into

  2446. 		trouble with limited numerical precision, causing the filter to perform

  2447. 		poorly.  For very low corner frequency, the State Variable (Chamberlin)

  2448. 		filter should be used.

  2449. 	</p>

  2450. </script>

  2451. <script type="text/x-red" data-template-name="AudioFilterBiquad">

  2452. 	<div class="form-row">

  2453. 		<label for="node-input-name"><i class="fa fa-tag"></i> Name</label>

  2454. 		<input type="text" id="node-input-name" placeholder="Name">

  2455. 	</div>

  2456. </script>

  2457. 

  2458. <script type="text/x-red" data-help-name="AudioFilterFIR">

  2459. 	<h3>Summary</h3>

  2460. 	<div class=tooltipinfo>

  2461. 	<p>Finite impulse response filter, useful for all sorts of filtering.

  2462. 	</p>

  2463. 	<p align=center><img src="img/fir_filter.png"></p>

  2464. 	</div>

  2465. 	<h3>Audio Connections</h3>

  2466. 	<table class=doc align=center cellpadding=3>

  2467. 		<tr class=top><th>Port</th><th>Purpose</th></tr>

  2468. 		<tr class=odd><td align=center>In 0</td><td>Signal to be filtered</td></tr>

  2469. 		<tr class=odd><td align=center>Out 0</td><td>Filtered Signal Output</td></tr>

  2470. 	</table>

  2471. 	<h3>Functions</h3>

  2472. 	<p class=func><span class=keyword>begin</span>(array, length);</p>

  2473. 	<p class=desc>Initialize the filter.  The array must be 16 bit integers (the

  2474. 		filter's impulse response), and

  2475. 		length indicates the number of points in the array.  Array may also be

  2476. 		FIR_PASSTHRU (length = 0), to directly pass the input to output without

  2477. 		filtering.

  2478. 	</p>

  2479. 	<p class=func><span class=keyword>end</span>();</p>

  2480. 	<p class=desc>Turn the filter off.

  2481. 	</p>

  2482. 	<h3>Examples</h3>

  2483. 	<p class=exam>File &gt; Examples &gt; Audio &gt; Effects &gt; Filter_FIR

  2484. 	</p>

  2485. 	<h3>Known Issues</h3>

  2486. 	<p>Your filter's impulse response array must have an even length.  If you have

  2487. 		add odd number of taps, you must add an extra zero to increase the length

  2488. 		to an even number.

  2489. 	</p>

  2490. 	<p>The minimum number of taps is 4.  If you use less, add extra zeros to increase

  2491. 		the length to 4.

  2492. 	</p>

  2493. 	<p>The impulse response must be given in reverse order.  Many filters have

  2494. 		symetrical impluse response, making this a non-issue.  If your filter has

  2495. 		a non-symetrical response, make sure the data is in reverse time order.

  2496. 	</p>

  2497. 	<h3>Notes</h3>

  2498. 	<p>FIR filters requires more CPU time than Biquad (IIR), but they can

  2499. 		implement filters with better phase response.

  2500. 	</p>

  2501. 	<p>A 100 point filter requires 9% CPU time on Teensy 3.1.  The maximum

  2502. 		supported filter length is 200 points.

  2503. 	</p>

  2504. 	<p>The free

  2505. 		<a href="http://t-filter.engineerjs.com/" target="_blank"> TFilter Design Tool</a>

  2506. 		can be used to create the impulse response array.  Be sure to set the sampling

  2507. 		frequency to 44117 HZ (it defaults to only 2000 Hz) and the output type to "int" (16 bit).

  2508. 	</p>

  2509. 	<p>

  2510. 		If you use TFilter Design's "C/C++ array" option, it's output has "int" definition, which

  2511. 		is 32 bits on Teensy 3.1.  Edit "int" to "short" for an array of 16 bit numbers,

  2512. 		and add "const" to avoid consuming extra RAM.

  2513. 	</p>

  2514. </script>

  2515. <script type="text/x-red" data-template-name="AudioFilterFIR">

  2516. 	<div class="form-row">

  2517. 		<label for="node-input-name"><i class="fa fa-tag"></i> Name</label>

  2518. 		<input type="text" id="node-input-name" placeholder="Name">

  2519. 	</div>

  2520. </script>

  2521. 

  2522. <script type="text/x-red" data-help-name="AudioFilterStateVariable">

  2523. 	<h3>Summary</h3>

  2524. 	<div class=tooltipinfo>

  2525. 	<p>A State Variable (Chamberlin) Filter with 12 dB/octave roll-off,

  2526. 		adjustable resonance, and optional signal control of corner

  2527. 		frequency.</p>

  2528. 	</div>

  2529. 	<h3>Audio Connections</h3>

  2530. 	<table class=doc align=center cellpadding=3>

  2531. 		<tr class=top><th>Port</th><th>Purpose</th></tr>

  2532. 		<tr class=odd><td align=center>In 0</td><td>Signal to Filter</td></tr>

  2533. 		<tr class=odd><td align=center>In 1</td><td>Frequency Control</td></tr>

  2534. 		<tr class=odd><td align=center>Out 0</td><td>Low Pass Output</td></tr>

  2535. 		<tr class=odd><td align=center>Out 1</td><td>Band Pass Output</td></tr>

  2536. 		<tr class=odd><td align=center>Out 2</td><td>High Pass Output</td></tr>

  2537. 	</table>

  2538. 	<h3>Functions</h3>

  2539. 	<p class=func><span class=keyword>frequency</span>(freq);</p>

  2540. 	<p class=desc>Set the filter's corner frequency.  When a signal is

  2541. 		connected to the control input, the filter will implement this

  2542. 		frequency when the signal is zero.

  2543. 	</p>

  2544. 	<p class=func><span class=keyword>resonance</span>(Q);</p>

  2545. 	<p class=desc>Set the filter's resonance.  Q ranges from 0.7 to 5.0.

  2546. 		Resonance greater than 0.707 will amplify the signal near the

  2547. 		corner frequency.  You must attenuate the signal before input

  2548. 		to this filter, to prevent clipping.

  2549. 	</p>

  2550. 	<p class=func><span class=keyword>octaveControl</span>(octaves);</p>

  2551. 	<p class=desc>Set how much (in octaves) the control signal can alter

  2552. 		the filter's corner freqency.  Range is 0 to 7 octaves.  For

  2553. 		example, when set to 2.5, a full scale positive signal (1.0) will

  2554. 		shift the filter frequency up 2.5 octaves, and a full scale negative

  2555. 		signal will shift it down 2.5 octaves.

  2556. 	</p>

  2557. 	<!--

  2558. <h3>Examples</h3>

  2559. 	<p class=exam>File &gt; Examples &gt; Audio &gt;

  2560. 	</p>

  2561. -->

  2562. 	<h3>Notes</h3>

  2563. 	<p>

  2564. 		When controlled by a signal, the equation for the filter

  2565. 		frequency is:

  2566. 	</p>

  2567. 	<p>

  2568. 		F = Fcenter * 2^<sup>(signal * octaves)</sup>

  2569. 		<br><small>If anyone knows how to do HTML equations, please

  2570. 		help me improve this.....</small>

  2571. 	</p>

  2572. 	<p>When operating with signal control of corner frequency, this

  2573. 		object uses approximately 4% of the CPU time on Teensy 3.1.

  2574. 	</p>

  2575. </script>

  2576. <script type="text/x-red" data-template-name="AudioFilterFIR">

  2577. 	<div class="form-row">

  2578. 		<label for="node-input-name"><i class="fa fa-tag"></i> Name</label>

  2579. 		<input type="text" id="node-input-name" placeholder="Name">

  2580. 	</div>

  2581. </script>

  2582. 

  2583. <script type="text/x-red" data-help-name="AudioAnalyzePeak">

  2584. 	<h3>Summary</h3>

  2585. 	<div class=tooltipinfo>

  2586. 	<p>Track the signal peak amplitude.  Very useful for simple

  2587. 		audio level response projects, and general troubleshooting.</p>

  2588. 	</div>

  2589. 	<h3>Audio Connections</h3>

  2590. 	<table class=doc align=center cellpadding=3>

  2591. 		<tr class=top><th>Port</th><th>Purpose</th></tr>

  2592. 		<tr class=odd><td align=center>In 0</td><td>Signal to analyze</td></tr>

  2593. 	</table>

  2594. 	<h3>Functions</h3>

  2595. 	<p class=func><span class=keyword>available</span>();</p>

  2596. 	<p class=desc>Returns true each time new peak data is available.

  2597. 	</p>

  2598. 	<p class=func><span class=keyword>read</span>();</p>

  2599. 	<p class=desc>Read the highest peak amplitude value since the last read.

  2600. 		Return is from 0.0 to 1.0.

  2601. 	</p>

  2602. 	<p class=func><span class=keyword>readPeakToPeak</span>();</p>

  2603. 	<p class=desc>Read the highest peak-to-peak amplitude since the last read.

  2604. 		Return is from 0.0 to 2.0.

  2605. 	</p>

  2606. 	<h3>Examples</h3>

  2607. 	<p class=exam>File &gt; Examples &gt; Audio &gt; Analysis &gt; PeakMeterMono

  2608. 	</p>

  2609. 	<p class=exam>File &gt; Examples &gt; Audio &gt; Analysis &gt; PeakMeterStereo

  2610. 	</p>

  2611. 	<h3>Notes</h3>

  2612. 	<p></p>

  2613. </script>

  2614. <script type="text/x-red" data-template-name="AudioAnalyzePeak">

  2615. 	<div class="form-row">

  2616. 		<label for="node-input-name"><i class="fa fa-tag"></i> Name</label>

  2617. 		<input type="text" id="node-input-name" placeholder="Name">

  2618. 	</div>

  2619. </script>

  2620. 

  2621. <script type="text/x-red" data-help-name="AudioAnalyzeRMS">

  2622. 	<h3>Summary</h3>

  2623. 	<div class=tooltipinfo>

  2624. 	<p>Track the signal RMS amplitude.  Useful for

  2625. 		audio level response projects, and general troubleshooting.</p>

  2626. 	</div>

  2627. 	<h3>Audio Connections</h3>

  2628. 	<table class=doc align=center cellpadding=3>

  2629. 		<tr class=top><th>Port</th><th>Purpose</th></tr>

  2630. 		<tr class=odd><td align=center>In 0</td><td>Signal to analyze</td></tr>

  2631. 	</table>

  2632. 	<h3>Functions</h3>

  2633. 	<p class=func><span class=keyword>available</span>();</p>

  2634. 	<p class=desc>Returns true if new RMS data is available.

  2635. 	</p>

  2636. 	<p class=func><span class=keyword>read</span>();</p>

  2637. 	<p class=desc>Read the new RMS value.

  2638. 		Return is from 0.0 to 1.0.

  2639. 	</p>

  2640. 	<h3>Examples</h3>

  2641. 	<p class=exam>File &gt; Examples &gt; Audio &gt; Analysis &gt; PeakAndRMSMeterStereo</p>

  2642. 	</p>

  2643. 	<h3>Notes</h3>

  2644. 	<p></p>

  2645. </script>

  2646. <script type="text/x-red" data-template-name="AudioAnalyzeRMS">

  2647. 	<div class="form-row">

  2648. 		<label for="node-input-name"><i class="fa fa-tag"></i> Name</label>

  2649. 		<input type="text" id="node-input-name" placeholder="Name">

  2650. 	</div>

  2651. </script>

  2652. 

  2653. <script type="text/x-red" data-help-name="AudioAnalyzeFFT256">

  2654. 	<h3>Summary</h3>

  2655. 	<div class=tooltipinfo>

  2656. 	<p>Compute a 256 point Fast Fourier Transform (FFT) frequency analysis,

  2657. 		with real value (magnitude) output.  The frequency resolution is

  2658. 		172 Hz, useful for simple audio visualization.</p>

  2659. 	</div>

  2660. 	<h3>Audio Connections</h3>

  2661. 	<table class=doc align=center cellpadding=3>

  2662. 		<tr class=top><th>Port</th><th>Purpose</th></tr>

  2663. 		<tr class=odd><td align=center>In 0</td><td>Signal to convert to frequency bins</td></tr>

  2664. 	</table>

  2665. 	<h3>Functions</h3>

  2666. 	<p class=func><span class=keyword>available</span>();</p>

  2667. 	<p class=desc>Returns true each time the FFT analysis produces new output data.

  2668. 	</p>

  2669. 	<p class=func><span class=keyword>read</span>(binNumber);</p>

  2670. 	<p class=desc>Read a single frequency bin, from 0 to 127.  The result is scaled

  2671. 		so 1.0 represents a full scale sine wave.

  2672. 	</p>

  2673. 	<p class=func><span class=keyword>read</span>(firstBin, lastBin);</p>

  2674. 	<p class=desc>Read several frequency bins, returning their sum.  The higher

  2675. 		audio octaves are represented by many bins, which are typically read

  2676. 		as a group for audio visualization.

  2677. 	</p>

  2678. 	<p class=func><span class=keyword>averageTogether</span>(number);</p>

  2679. 	<p class=desc>New data is produced very radidly, approximately 344 times

  2680. 		per second.  Multiple outputs can be averaged together, so available()

  2681. 		returns true at a slower rate.

  2682. 	</p>

  2683. 	<p class=func><span class=keyword>windowFunction</span>(window);</p>

  2684. 	<p class=desc>Set the window function to be used.  AudioWindowHanning256

  2685. 		is the default.  Windowing may be disabled by NULL, but windowing

  2686. 		should be used for all non-periodic (music) signals, and all periodic

  2687. 		signals that are not exact integer division of the sample rate.

  2688. 	</p>

  2689. 

  2690. 	<h3>Examples</h3>

  2691. 	<p class=exam>File &gt; Examples &gt; Audio &gt; MemoryAndCpuUsage

  2692. 	</p>

  2693. 	<h3>Notes</h3>

  2694. 	<p>The raw 16 bit output data bins may be access with myFFT.output[num], where

  2695. 		num is 0 to 127.</p>

  2696. 	<p>TODO: caveats about spectral leakage vs frequency precision for arbitrary signals</p>

  2697. 	<p>Window Types:

  2698. 		<ul>

  2699. 		<li><span class=literal>AudioWindowHanning256</span> (default)</li>

  2700. 		<li><span class=literal>AudioWindowBartlett256</span></li>

  2701. 		<li><span class=literal>AudioWindowBlackman256</span></li>

  2702. 		<li><span class=literal>AudioWindowFlattop256</span></li>

  2703. 		<li><span class=literal>AudioWindowBlackmanHarris256</span></li>

  2704. 		<li><span class=literal>AudioWindowNuttall256</span></li>

  2705. 		<li><span class=literal>AudioWindowBlackmanNuttall256</span></li>

  2706. 		<li><span class=literal>AudioWindowWelch256</span></li>

  2707. 		<li><span class=literal>AudioWindowHamming256</span></li>

  2708. 		<li><span class=literal>AudioWindowCosine256</span></li>

  2709. 		<li><span class=literal>AudioWindowTukey256</span></li>

  2710. 		</ul>

  2711. 	</p>

  2712. </script>

  2713. <script type="text/x-red" data-template-name="AudioAnalyzeFFT256">

  2714. 	<div class="form-row">

  2715. 		<label for="node-input-name"><i class="fa fa-tag"></i> Name</label>

  2716. 		<input type="text" id="node-input-name" placeholder="Name">

  2717. 	</div>

  2718. </script>

  2719. 

  2720. <script type="text/x-red" data-help-name="AudioAnalyzeFFT1024">

  2721. 	<h3>Summary</h3>

  2722. 	<div class=tooltipinfo>

  2723. 	<p>Compute a 1024 point Fast Fourier Transform (FFT) frequency analysis,

  2724. 		with real value (magnitude) output.  The frequency resolution is

  2725. 		43 Hz, useful detailed for audio visualization.</p>

  2726. 	</div>

  2727. 	<h3>Audio Connections</h3>

  2728. 	<table class=doc align=center cellpadding=3>

  2729. 		<tr class=top><th>Port</th><th>Purpose</th></tr>

  2730. 		<tr class=odd><td align=center>In 0</td><td>Signal to convert to frequency bins</td></tr>

  2731. 	</table>

  2732. 	<h3>Functions</h3>

  2733. 	<p class=func><span class=keyword>available</span>();</p>

  2734. 	<p class=desc>Returns true each time the FFT analysis produces new output data.

  2735. 	</p>

  2736. 	<p class=func><span class=keyword>read</span>(binNumber);</p>

  2737. 	<p class=desc>Read a single frequency bin, from 0 to 511.  The result is scaled

  2738. 		so 1.0 represents a full scale sine wave.

  2739. 	</p>

  2740. 	<p class=func><span class=keyword>read</span>(firstBin, lastBin);</p>

  2741. 	<p class=desc>Read several frequency bins, returning their sum.  The higher

  2742. 		audio octaves are represented by many bins, which are typically read

  2743. 		as a group for audio visualization.

  2744. 	</p>

  2745. 	<p class=func><span class=keyword>averageTogether</span>(number);</p>

  2746. 	<p class=desc>This function does nothing.  The 1024 point FFT always

  2747. 		updates at approximately 86 times per second.

  2748. 	</p>

  2749. 	<p class=func><span class=keyword>windowFunction</span>(window);</p>

  2750. 	<p class=desc>Set the window function to be used.  AudioWindowHanning1024

  2751. 		is the default.  Windowing may be disabled by NULL, but windowing

  2752. 		should be used for all non-periodic (music) signals, and all periodic

  2753. 		signals that are not exact integer division of the sample rate.

  2754. 	</p>

  2755. 	<h3>Examples</h3>

  2756. 	<p class=exam>File &gt; Examples &gt; Audio &gt; Analysis &gt; FFT

  2757. 	</p>

  2758. 	<p class=exam>File &gt; Examples &gt; Audio &gt; Analysis &gt; SpectrumAnalyzerBasic

  2759. 	</p>

  2760. 	<h3>Notes</h3>

  2761. 	<p>The raw 16 bit output data bins may be access with myFFT.output[num], where

  2762. 		num is 0 to 511.</p>

  2763. 	<p>TODO: caveats about spectral leakage vs frequency precision for arbitrary signals</p>

  2764. 	<p>Window Types:

  2765. 		<ul>

  2766. 		<li><span class=literal>AudioWindowHanning1024</span> (default)</li>

  2767. 		<li><span class=literal>AudioWindowBartlett1024</span></li>

  2768. 		<li><span class=literal>AudioWindowBlackman1024</span></li>

  2769. 		<li><span class=literal>AudioWindowFlattop1024</span></li>

  2770. 		<li><span class=literal>AudioWindowBlackmanHarris1024</span></li>

  2771. 		<li><span class=literal>AudioWindowNuttall1024</span></li>

  2772. 		<li><span class=literal>AudioWindowBlackmanNuttall1024</span></li>

  2773. 		<li><span class=literal>AudioWindowWelch1024</span></li>

  2774. 		<li><span class=literal>AudioWindowHamming1024</span></li>

  2775. 		<li><span class=literal>AudioWindowCosine1024</span></li>

  2776. 		<li><span class=literal>AudioWindowTukey1024</span></li>

  2777. 		</ul>

  2778. 	</p>

  2779. 	<p>1024 point FFT has a peak CPU usage of approx 52% on Teensy 3.1.

  2780. 		Average usage is much lower.  Future versions might distribute the

  2781. 		load more evenly over time....

  2782. 	</p>

  2783. </script>

  2784. <script type="text/x-red" data-template-name="AudioAnalyzeFFT1024">

  2785. 	<div class="form-row">

  2786. 		<label for="node-input-name"><i class="fa fa-tag"></i> Name</label>

  2787. 		<input type="text" id="node-input-name" placeholder="Name">

  2788. 	</div>

  2789. </script>

  2790. 

  2791. <script type="text/x-red" data-help-name="AudioAnalyzeToneDetect">

  2792. 	<h3>Summary</h3>

  2793. 	<div class=tooltipinfo>

  2794. 	<p>Detect the level of a single tone</p>

  2795. 	</div>

  2796. 	<h3>Audio Connections</h3>

  2797. 	<table class=doc align=center cellpadding=3>

  2798. 		<tr class=top><th>Port</th><th>Purpose</th></tr>

  2799. 		<tr class=odd><td align=center>In 0</td><td>Signal to analyze</td></tr>

  2800. 	</table>

  2801. 	<h3>Functions</h3>

  2802. 	<p class=func><span class=keyword>frequency</span>(freq);</p>

  2803. 	<p class=desc>Set the frequency to detect.  The default detection time

  2804. 		will be 10 cycles of this frequency.

  2805. 	</p>

  2806. 	<p class=func><span class=keyword>frequency</span>(freq, cycles);</p>

  2807. 	<p class=desc>Set the frequency to detect, and the number of cycles.

  2808. 		Longer detection time (more cycles) will give higher precision,

  2809. 		but of course slower response.

  2810. 	</p>

  2811. 	<p class=func><span class=keyword>available</span>();</p>

  2812. 	<p class=desc>Returns true (non-zero) each time a detection interval

  2813. 		(number of cycles) completed and a new level is detected.

  2814. 	</p>

  2815. 	<p class=func><span class=keyword>read</span>();</p>

  2816. 	<p class=desc>Read the detected signal level.  Range is 0 to 1.0.

  2817. 	</p>

  2818. 	<p class=func><span class=keyword>threshold</span>(level);</p>

  2819. 	<p class=desc>Set a detection threshold, where the bool test operation

  2820. 		will return true if at or above this level, or false when below.

  2821. 	</p>

  2822. 	<p class=func>(bool)</p>

  2823. 	<p class=desc>By testing the object as a boolean value, you can respond

  2824. 		to detection of a tone.

  2825. 	</p>

  2826. 	<h3>Examples</h3>

  2827. 	<p class=exam>File &gt; Examples &gt; Audio &gt; Analysis &gt; DialTone_Serial

  2828. 	</p>

  2829. 	<p class=exam>File &gt; Examples &gt; Audio &gt; Analysis &gt; DialTone_7segment

  2830. 	</p>

  2831. 	<h3>Notes</h3>

  2832. 	<p>Low frequency detection has trouble with numerical precision.

  2833. 		Works really well for all 8 DTMF frequencies, but fails for

  2834. 		detecting "sub audible tones" used in some control applications.</p>

  2835. 	<p>The (bool) test continues to return true until the next detection

  2836. 		interval (the configured number of cycles).  This behavior may

  2837. 		change in future versions, for a single true each time the signal

  2838. 		is detected, and then false for the remainder of that interval.</p>

  2839. </script>

  2840. <script type="text/x-red" data-template-name="AudioAnalyzeToneDetect">

  2841. 	<div class="form-row">

  2842. 		<label for="node-input-name"><i class="fa fa-tag"></i> Name</label>

  2843. 		<input type="text" id="node-input-name" placeholder="Name">

  2844. 	</div>

  2845. </script>

  2846. 

  2847. <script type="text/x-red" data-help-name="AudioAnalyzeNoteFrequency">

  2848. 	<h3>Summary</h3>

  2849. 	<div class=tooltipinfo>

  2850. 	<p>Detect with fairly good accuracy the fundamental frequency f<sub>o</sub>

  2851. 		of musical notes, such as electric guitar and bass.</p>

  2852. 	</div>

  2853.     <p>Written By Collin Duffy</p>

  2854. 	<h3>Audio Connections</h3>

  2855. 	<table class=doc align=center cellpadding=3>

  2856. 		<tr class=top><th>Port</th><th>Purpose</th></tr>

  2857. 		<tr class=odd><td align=center>In 0</td><td>Signal to analyze</td></tr>

  2858. 	</table>

  2859. 	<h3>Functions</h3>

  2860. 	<p class=func><span class=keyword>begin</span>(threshold);</p>

  2861. 	<p class=desc>Initialize and start detecting frequencies,

  2862. 		with an initial threshold (the amount of allowed uncertainty).

  2863. 	</p>

  2864. 	<p class=func><span class=keyword>available</span>();</p>

  2865. 	<p class=desc>Returns true (non-zero) when a valid

  2866. 		frequency is detected.

  2867. 	</p>

  2868. 	<p class=func><span class=keyword>read</span>();</p>

  2869. 	<p class=desc>Read the detected frequency.

  2870. 	</p>

  2871. 	<p class=func><span class=keyword>probability</span>();</p>

  2872. 	<p class=desc>Return the level of certainty, betweeo 0 to 1.0.

  2873. 	</p>

  2874. 	<p class=func><span class=keyword>threshold</span>(level);</p>

  2875. 	<p class=desc>Set the detection threshold, the amount of allowed uncertainty.

  2876. 	</p>

  2877. 	<h3>Examples</h3>

  2878. 	<p class=exam>File &gt; Examples &gt; Audio &gt; Analysis &gt; NoteFrequency

  2879. 	</p>

  2880. 	<h3>Notes</h3>

  2881. 	<p>The <a href="http://recherche.ircam.fr/equipes/pcm/cheveign/pss/2002_JASA_YIN.pdf">YIN algorithm</a> (PDF)

  2882. 		is used to detect frequencies, with many optimizations for

  2883. 		frequencies between 29-400Hz.  This algorithm can be somewhat

  2884. 		memory and processor hungry but will allow you to detect with

  2885. 		fairly good accuracy the fundamental frequencies from

  2886. 		electric guitars and basses.</p>

  2887. 	<p>Within the code, AUDIO_GUITARTUNER_BLOCKS

  2888. 		may be edited to control low frequency range.  The default

  2889. 		(24) allows measurement down to 29.14 Hz, or B(flat)0.</p>

  2890. 	<p>TODO: The usable upper range of this object is not well known.

  2891. 		Duff says "it should be good up to 1000Hz", but may have trouble

  2892. 		at 4 kHz.  Please <a href="https://forum.pjrc.com/threads/32252-Different-Range-FFT-Algorithm/page2">post feedback here</a>, ideally with audio clips for the NoteFrequency example.</p>

  2893. 	<p>This object was contributed by Collin Duffy from his

  2894. 		<a href="https://github.com/duff2013/AudioTuner">AudioTuner project</a>.

  2895. 		Additional details and documentation may be found there.</p>

  2896. </script>

  2897. <script type="text/x-red" data-template-name="AudioAnalyzeNoteFrequency">

  2898. 	<div class="form-row">

  2899. 		<label for="node-input-name"><i class="fa fa-tag"></i> Name</label>

  2900. 		<input type="text" id="node-input-name" placeholder="Name">

  2901. 	</div>

  2902. </script>

  2903. 

  2904. <script type="text/x-red" data-help-name="AudioAnalyzePrint">

  2905. 	<h3>Summary</h3>

  2906. 	<div class=tooltipinfo>

  2907. 	<p>Print raw audio data to the Arduino Serial Monitor.  This

  2908. 		object creates massive output quickly, and should not normally be used.</p>

  2909. 	</div>

  2910. 	<h3>Audio Connections</h3>

  2911. 	<table class=doc align=center cellpadding=3>

  2912. 		<tr class=top><th>Port</th><th>Purpose</th></tr>

  2913. 		<tr class=odd><td align=center>In 0</td><td>Signal to print</td></tr>

  2914. 	</table>

  2915. 	<h3>Functions</h3>

  2916. 	<p class=func><span class=keyword>name</span>(string);</p>

  2917. 	<p class=desc>blah blah blah blah

  2918. 	</p>

  2919. 	<p class=func><span class=keyword>trigger</span>();</p>

  2920. 	<p class=desc>blah blah blah blah

  2921. 	</p>

  2922. 	<p class=func><span class=keyword>trigger</span>(level, edge);</p>

  2923. 	<p class=desc>blah blah blah blah

  2924. 	</p>

  2925. 	<p class=func><span class=keyword>delay</span>(samples);</p>

  2926. 	<p class=desc>blah blah blah blah

  2927. 	</p>

  2928. 	<p class=func><span class=keyword>length</span>(samples);</p>

  2929. 	<p class=desc>blah blah blah blah

  2930. 	</p>

  2931. 	<!--

  2932. <h3>Examples</h3>

  2933. 	<p class=exam>File &gt; Examples &gt; Audio &gt;

  2934. 	</p>

  2935. -->

  2936. 	<h3>Notes</h3>

  2937. 	<p>This object doesn't work very well and probably should not be used.</p>

  2938. </script>

  2939. <script type="text/x-red" data-template-name="AudioAnalyzePrint">

  2940. 	<div class="form-row">

  2941. 		<label for="node-input-name"><i class="fa fa-tag"></i> Name</label>

  2942. 		<input type="text" id="node-input-name" placeholder="Name">

  2943. 	</div>

  2944. </script>

  2945. 

  2946. <script type="text/x-red" data-help-name="AudioControlSGTL5000">

  2947. 	<h3>Summary</h3>

  2948. 	<div class=tooltipinfo>

  2949. 	<p>Control the SGTL5000 chip on the

  2950. 		<a href="http://www.pjrc.com/store/teensy3_audio.html" target="_blank">audio shield</a>.

  2951. 		SGTL5000 is always used in slave mode, where Teensy controls

  2952. 		all I2S timing.

  2953. 	</p>

  2954. 	<p align=center><img src="img/sgtl5000closeup.jpg"></p>

  2955. 	</div>

  2956. 	<h3>Audio Connections</h3>

  2957. 	<p>This object has no audio inputs or outputs.  Separate i2s objects

  2958. 		are used to send and receive audio data.  I2S master mode objects

  2959. 		must be used, because this object configures the SGTL5000 in slave

  2960. 		mode, where it depends on Teensy to provide all I2S clocks.

  2961. 		This object controls

  2962. 		how the SGTL5000 will use those I2S audio streams.</p>

  2963. 

  2964. 	<h3>Functions</h3>

  2965. 	<p>These are the most commonly used SGTL5000 functions.</p>

  2966. 	<p class=func><span class=keyword>enable</span>();</p>

  2967. 	<p class=desc>Start the SGTL5000.  This function should be called first.

  2968. 	</p>

  2969. 	<p class=func><span class=keyword>volume</span>(level);</p>

  2970. 	<p class=desc>Set the headphone volume level.  Range is 0 to 1.0, but

  2971. 		0.8 corresponds to the maximum undistorted output for a full scale

  2972. 		signal.  Usually 0.5 is a comfortable listening level.  The line

  2973. 		level outputs are <em>not</em> changed by this function.

  2974. 	</p>

  2975. 	<p class=func><span class=keyword>inputSelect</span>(input);</p>

  2976. 	<p class=desc>Select which input to use: AUDIO_INPUT_LINEIN or AUDIO_INPUT_MIC.

  2977. 	</p>

  2978. 	<p class=func><span class=keyword>micGain</span>(dB);</p>

  2979. 	<p class=desc>When using the microphone input, set the amplifier gain.

  2980. 		The input number is in decibels, from 0 to 63.

  2981. 	</p>

  2982. 

  2983. 	<h3>Signal Levels</h3>

  2984. 

  2985. 	<p>The default signal levels should be used for most applications,

  2986. 		but these functions allow you to customize the analog signals.</p>

  2987. 

  2988. 	<p class=func><span class=keyword>muteHeadphone</span>();</p>

  2989. 	<p class=desc>Silence the headphone output.

  2990. 	</p>

  2991. 	<p class=func><span class=keyword>unmuteHeadphone</span>();</p>

  2992. 	<p class=desc>Turn the headphone output on.

  2993. 	</p>

  2994. 	<p class=func><span class=keyword>muteLineout</span>();</p>

  2995. 	<p class=desc>Silence the line level outputs.

  2996. 	</p>

  2997. 	<p class=func><span class=keyword>unmuteLineout</span>();</p>

  2998. 	<p class=desc>Turn the line level outputs on.

  2999. 	</p>

  3000. 	<p class=func><span class=keyword>lineInLevel</span>(both);</p>

  3001. 	<p class=desc style="padding-bottom:0.2em;">Adjust the sensitivity of the line-level inputs.

  3002. 		Fifteen settings are possible:

  3003. 	</p>

  3004. <pre class="desc">

  3005.  0: 3.12 Volts p-p

  3006.  1: 2.63 Volts p-p

  3007.  2: 2.22 Volts p-p

  3008.  3: 1.87 Volts p-p

  3009.  4: 1.58 Volts p-p

  3010.  5: 1.33 Volts p-p  (default)

  3011.  6: 1.11 Volts p-p

  3012.  7: 0.94 Volts p-p

  3013.  8: 0.79 Volts p-p

  3014.  9: 0.67 Volts p-p

  3015. 10: 0.56 Volts p-p

  3016. 11: 0.48 Volts p-p

  3017. 12: 0.40 Volts p-p

  3018. 13: 0.34 Volts p-p

  3019. 14: 0.29 Volts p-p

  3020. 15: 0.24 Volts p-p

  3021. </pre>

  3022. 	<p class=func><span class=keyword>lineInLevel</span>(left, right);</p>

  3023. 	<p class=desc>Adjust the sensitivity of the line-level inputs, with different

  3024. 		settings for left and right.  The same 15 settings are available.

  3025. 	</p>

  3026. 	<p class=func><span class=keyword>lineOutLevel</span>(both);</p>

  3027. 	<p class=desc style="padding-bottom:0.2em;">Adjust the line level output

  3028. 		voltage range.  The following settings are possible:

  3029. 	</p>

  3030. <pre class="desc">

  3031. 13: 3.16 Volts p-p

  3032. 14: 2.98 Volts p-p

  3033. 15: 2.83 Volts p-p

  3034. 16: 2.67 Volts p-p

  3035. 17: 2.53 Volts p-p

  3036. 18: 2.39 Volts p-p

  3037. 19: 2.26 Volts p-p

  3038. 20: 2.14 Volts p-p

  3039. 21: 2.02 Volts p-p

  3040. 22: 1.91 Volts p-p

  3041. 23: 1.80 Volts p-p

  3042. 24: 1.71 Volts p-p

  3043. 25: 1.62 Volts p-p

  3044. 26: 1.53 Volts p-p

  3045. 27: 1.44 Volts p-p

  3046. 28: 1.37 Volts p-p

  3047. 29: 1.29 Volts p-p  (default)

  3048. 30: 1.22 Volts p-p

  3049. 31: 1.16 Volts p-p

  3050. </pre>

  3051. 	<p class=func><span class=keyword>lineOutLevel</span>(left, right);</p>

  3052. 	<p class=desc>Adjust the line level outout voltage range, with separate

  3053. 		settings for left and right.  The same settings (13 to 31) are available.

  3054. 	</p>

  3055. 

  3056. 

  3057. 	<h3>Signal Conditioning</h3>

  3058. 

  3059. 	<p>Usually these digital signal conditioning features should be left at their

  3060. 		default settings.

  3061. 	</p>

  3062. 

  3063. 	<p class=func><span class=keyword>adcHighPassFilterFreeze</span>();</p>

  3064. 	<p class=desc>By default, the analog input (either line-level inputs or mic)

  3065. 		is high-pass filtered, to remove any DC component.  This function

  3066. 		freezes the filter, so the current DC component is still substracted, but

  3067. 		the filter stops tracking any DC or low frequency changes.

  3068. 	</p>

  3069. 	<p class=func><span class=keyword>adcHighPassFilterDisable</span>();</p>

  3070. 	<p class=desc>Completely disable the analog input filter.  DC and sub-audible

  3071. 		low frequencies are allowed to enter the digital signal.

  3072. 	</p>

  3073. 	<p class=func><span class=keyword>adcHighPassFilterEnable</span>();</p>

  3074. 	<p class=desc>Turn the DC-blocking filter back on, if disabled, or

  3075. 		allows it to resume tracking DC and low frequency changes, if

  3076. 		previously frozen. This is the default setting.

  3077. 	</p>

  3078. 	<p class=func><span class=keyword>dacVolume</span>(both);</p>

  3079. 	<p class=desc>Normally output volume should be used with volume(), which

  3080. 		changes the analog gain in the headphone amplifier.  This function

  3081. 		on the other hand controls digital attenuation before conversion to analog, which

  3082. 		reduces resolution, but allows another fine control of output

  3083. 		signal level.  The ranges is 0 to 1.0, with the default (no digital attenuation)

  3084. 		at 1.0.

  3085. 	</p>

  3086. 	<p  class=desc>dacVolume uses zero-crossing detect to avoid clicks, and graceful

  3087. 		ramping is handled by the chip so that a new volume may be set directly in

  3088. 		a single call.

  3089. 	</p>

  3090. 	<p class=func><span class=keyword>dacVolume</span>(left, right);</p>

  3091. 	<p class=desc>Adjust the digital output volume separately on left and

  3092. 		right channels.

  3093. 	</p>

  3094. 	<p class=func><span class=keyword>dacVolumeRamp</span>();</p>

  3095. 	<p class=desc>Enable graceful volume ramping.  The dacVolume adjusts gradually using

  3096. 		an exponential curve.  Pops or loud clicks are avoided when making large

  3097. 		changes in volume level.

  3098. 	</p>

  3099. 	<p class=func><span class=keyword>dacVolumeRampLinear</span>();</p>

  3100. 	<p class=desc>Enable faster volume ramping.  A slight click may be heard during a

  3101. 		large volume change.

  3102. 	</p>

  3103. 	<p class=func><span class=keyword>dacVolumeRampDisable</span>();</p>

  3104. 	<p class=desc>Do not use any gradual ramping.  The zero cross feature still helps

  3105. 		for small changes, but large volume changes may produce a pop or click.

  3106. 	</p>

  3107. 

  3108. 	<h3>Audio Processor</h3>

  3109. 

  3110. 	<p>The optional digital audio processor is capable of implementing

  3111. 		one or more of: automatic volume control, surround sound control,

  3112. 		bass enhancement, and tonal adjustments (either a

  3113. 		simple tone control, or a parametric equalizer, or a graphic equalizer),

  3114. 		in that order.

  3115. 	</p>

  3116. 	<p>These signal processing features are implemented in the SGTL5000 chip,

  3117. 		so they do not consume CPU time on Teensy. However, the order of

  3118. 		these processes is fixed in the hardware.

  3119. 	</p>

  3120. 	<p>It is good practice to mute the outputs before enabling or disabling

  3121. 	the Audio Processor, to avoid clicks or thumps.

  3122. 	</p>

  3123. 

  3124. 	<p class=func><span class=keyword>audioPreProcessorEnable</span>();</p>

  3125. 	<p class=desc>Enable the audio processor to pre-process the input

  3126. 		(from either line-level inputs or microphone) before it's sent

  3127. 		to Teensy by I2S.

  3128. 	</p>

  3129. 	<p class=func><span class=keyword>audioPostProcessorEnable</span>();</p>

  3130. 	<p class=desc>Enable the audio processor to post-process Teensy's

  3131. 		I2S output before it's turned into analog signals for the

  3132. 		headphones and/or line level outputs.

  3133. 	</p>

  3134. 	<p class=func><span class=keyword>audioProcessorDisable</span>();</p>

  3135. 	<p class=desc>Disable the audio processor.

  3136. 	</p>

  3137. 	<p class=func><span class=keyword>autoVolumeControl</span>(maxGain, response, hardLimit, threshold, attack, decay);</p>

  3138. 	<p class=desc>Configures the auto volume control, which is implemented as a compressor/expander

  3139. 	or hard limiter. 	<em>maxGain</em> is the maximum gain that can be applied for expanding, and

  3140. 	can take one of three values: 0 (0dB), 1 (6.0dB) and 2 (12dB). Values greater than 2 are treated

  3141. 	as 2. <em>response</em> controls the integration time for the compressor and can take

  3142. 	four values: 0 (0ms), 1 (25ms), 2 (50ms) or 3 (100ms). Larger values average the volume

  3143. 	over a longer time, allowing short-term peaks through.

  3144. 	</p>

  3145. 	<p class=desc>If <em>hardLimit</em> is 0, a 'soft

  3146. 	knee' compressor is used to progressively compress louder values which are near to or above the

  3147. 	threashold (the louder they are, the greater the compression). If it is 1, a hard compressor

  3148. 	is used (all values above the threashold are the same loudness). The <em>threashold</em> is specified

  3149. 	as a float in the range 0dBFS to -96dBFS, where -18dBFS is a typical value.

  3150. 	<em>attack</em> is a float controlling the rate of decrease in gain when the signal is over

  3151. 	threashold, in dB/s. <em>decay</em> controls how fast gain is restored once the level

  3152. 	drops below threashold, again in dB/s. It is typically set to a longer value than attack.

  3153. 	</p>

  3154. 	<p class=func><span class=keyword>autoVolumeEnable</span>();</p>

  3155. 	<p class=desc>Enables auto volume control, using the previously specified settings.

  3156. 	</p>

  3157. 	<p class=func><span class=keyword>autoVolumeDisable</span>();</p>

  3158. 	<p class=desc>Disables auto volume control.

  3159. 	</p>

  3160. 

  3161. 	<p class=func><span class=keyword>surroundSoundEnable</span>();</p>

  3162. 	<p class=desc>Enable virtual surround processing, to give a broader and

  3163. 	deeper stereo image (even with mono input).

  3164. 	</p>

  3165. 	<p class=func><span class=keyword>surroundSoundDisable</span>();</p>

  3166. 	<p class=desc>Disable virtual surround processing. Before disabling, ramp up

  3167. 	the width to maximum to avoid pops.

  3168. 	</p>

  3169. 	<p class=func><span class=keyword>surroundSound</span>(width);</p>

  3170. 	<p class=desc>Configures virtual surround width from 0 (mono) to 7 (widest).

  3171. 	</p>

  3172. 	<p class=func><span class=keyword>surroundSound</span>(width, select);</p>

  3173. 	<p class=desc>Configures virtual surround width from 0 (mono) to 7 (widest).

  3174. 	<em>select</em> may be set to 1 (disable), 2 (mono input) or 3 (stereo input).

  3175. 	</p>

  3176. 

  3177. 	<p class=func><span class=keyword>enhanceBassEnable</span>();</p>

  3178. 	<p class=desc>Enable bass enhancement. A mono, low-pass filtered copy of

  3179. 	the original stereo signal has bass levels boosted and is then mixed back into

  3180. 	the stereo signal, which is then optionally high pass filtered (to remove

  3181. 	inaudible subsonic frequencies).

  3182. 	</p>

  3183. 	<p class=func><span class=keyword>enhanceBassDisable</span>();</p>

  3184. 	<p class=desc>Disable bass enhancement. Before disabling, ramp down the bass

  3185. 	enhancement level to zero.

  3186. 	</p>

  3187. 	<p class=func><span class=keyword>enhanceBass</span>(lr_lev, bass_lev);</p>

  3188. 	<p class=desc>Configures the bass enhancement by setting the levels of the

  3189. 	original stereo signal and the bass-enhanced mono level which will be mixed together.

  3190. 	There is no high-pass filter.

  3191. 	</p>

  3192. 	<p  class=desc>When changing bass level, call this function repeatedly to ramp up or down the bass in

  3193. 	steps of 0.5dB, to avoid pops.

  3194. 	</p>

  3195. 	<p class=func><span class=keyword>enhanceBass</span>(lr_lev, bass_lev, hpf_bypass, cutoff);</p>

  3196. 	<p class=desc>Configures the bass enhancement by setting the levels of the

  3197. 	original stereo signal and the bass-enhanced mono level which will be mixed together.

  3198. 	The high-pass filter may be enabled (0) or bypassed (1). The cutoff frequency is specified

  3199. 	as follows:

  3200. 	</p>

  3201. 	<pre class="desc">

  3202. value  frequency

  3203.  0      80Hz

  3204.  1     100Hz

  3205.  2     125Hz

  3206.  3     150Hz

  3207.  4     175Hz

  3208.  5     200Hz

  3209.  6     225Hz

  3210. </pre>

  3211. 	<p  class=desc>When changing bass level, call this function repeatedly to ramp up or down the bass in

  3212. 	steps of 0.5dB, to avoid pops.

  3213. 	</p>

  3214. 

  3215. 	<p class=func><span class=keyword>eqSelect</span>(n);</p>

  3216. 	<p class=desc>Selects the type of frequency control, where <em>n</em> is

  3217. 	one of</p>

  3218. 	<p class=desc><b>FLAT_FREQUENCY (0)</b><br>

  3219.     Equalizers and tone controls disabled, flat frequency response.</p>

  3220.     <p class=desc><b>PARAMETRIC_EQUALIZER (1)</b><br>

  3221.     Enables the 7-band parametric equalizer, thus disabling the

  3222. 	tone controls and graphic equalizer.</p>

  3223.     <p class=desc><b>TONE_CONTROLS (2)</b><br>

  3224.     Enables bass and treble tone controls, disabling the parametric

  3225. 	equalization and graphic equalizer.</p>

  3226.     <p class=desc><b>GRAPHIC_EQUALIZER (3)</b><br>

  3227.     Enables the five-band graphic equalizer, disabling the parametric

  3228. 	equalization and tone controls.</p>

  3229. 

  3230. 

  3231. 	<p class=func><span class=keyword>eqBands</span>(bass, treble);</p>

  3232. 	<p class=desc>Configures bass and treble tone controls, which are

  3233. 	implemented as one second order low pass filter (bass) in parallel with

  3234. 	one second order high pass filter (treble).

  3235. 	</p>

  3236. 	<p class=desc>When changing bass or treble level, call this function repeatedly to ramp

  3237. 	up or down the level in steps of 0.04 (=0.5dB) or so, to avoid pops.

  3238. 	</p>

  3239. 	<p class=func><span class=keyword>eqBands</span>(bass, mid_bass, midrange, mid_treble, treble);</p>

  3240. 	<p class=desc>Configures the graphic equalizer. It is implemented by five parallel,

  3241. 	second order biquad filters with fixed frequencies of 115Hz, 330Hz, 990Hz, 3kHz,

  3242. 	and 9.9kHz. Each band has a range of adjustment from 1.00 (+12dB) to -1.00 (-11.75dB).

  3243. 	</p>

  3244. 	<p class=func><span class=keyword>eqBand</span>(bandNum, n);</p>

  3245. 	<p class=desc>Configures the gain or cut on one band in the graphic equalizer.

  3246. 	<em>bandnum</em> can range from 1 to 5; <em>n</em> is a float in the range 1.00 to -1.00.

  3247. 	</p>

  3248. 	<p  class=desc>When changing a band, call this function repeatedly to ramp up the gain in steps of 0.5dB,

  3249. 	to avoid pops.

  3250. 	</p>

  3251. 

  3252. 	<p class=func><span class=keyword>eqFilter</span>(filterNum, filterParameters);</p>

  3253. 	<p class=desc>Configurs the parametric equalizer. The number of filters (1 to 7)

  3254. 	is specified along with  a pointer to an array of filter coefficients.

  3255. 	The parametric equalizer is implemented using 7 cascaded, second order bi-quad

  3256. 	filters whose frequencies, gain, and Q may be freely configured, but each filter

  3257. 	can only be specified as a set of filter coefficients.

  3258. 	</p>

  3259. 	<p class=func><span class=keyword>eqFilterCount</span>(n);</p>

  3260. 	<p class=desc>Enables zero or more of the already enabled parametric filters.

  3261. 	</p>

  3262. 

  3263. 	<h3>Examples</h3>

  3264. 	<p>Nearly all of the library's examples use this object.  These

  3265. 		examples demonstrate its special features.

  3266. 	</p>

  3267. 	<p class=exam>File &gt; Examples &gt; Audio &gt; HardwareTesting &gt; PassThroughStereo

  3268. 	</p>

  3269. 	<p class=exam>File &gt; Examples &gt; Audio &gt; HardwareTesting &gt; SGTL5000 &gt; dap_bass_enhance

  3270. 	</p>

  3271. 	<p class=exam>File &gt; Examples &gt; Audio &gt; HardwareTesting &gt; SGTL5000 &gt; dap_avc_agc

  3272. 	</p>

  3273. 	<p class=exam>File &gt; Examples &gt; Audio &gt; HardwareTesting &gt; SGTL5000 &gt; balanceDAC

  3274. 	</p>

  3275. 	<p class=exam>File &gt; Examples &gt; Audio &gt; HardwareTesting &gt; SGTL5000 &gt; balanceHP

  3276. 	</p>

  3277. 	<p class=exam>File &gt; Examples &gt; Audio &gt; HardwareTesting &gt; SGTL5000 &gt; CalcBiquadToneControlDAP

  3278. 	</p>

  3279. 	<p class=exam>File &gt; Examples &gt; Audio &gt; HardwareTesting &gt; SGTL5000 &gt; VolumeRamp

  3280. 	</p>

  3281. 	<h3>Notes</h3>

  3282. 	<p>TODO: add example with rock/classical/speech presets, where rock uses bass boost

  3283. 	and surround enhancement while speech uses bandpass filtering and auto volume control

  3284. 	compression.

  3285. 	</p>

  3286. 	<p>TODO: add example with two analogRead pots for bass and treble to demonstrate ramping.

  3287. 	</p>

  3288. </script>

  3289. <script type="text/x-red" data-template-name="AudioControlSGTL5000">

  3290. 	<div class="form-row">

  3291. 		<label for="node-input-name"><i class="fa fa-tag"></i> Name</label>

  3292. 		<input type="text" id="node-input-name" placeholder="Name">

  3293. 	</div>

  3294. </script>

  3295. 

  3296. <script type="text/x-red" data-help-name="AudioControlWM8731">

  3297. 	<h3>Summary</h3>

  3298. 	<div class=tooltipinfo>

  3299. 	<p>Control a WM8731 chip in slave mode, where it receives all clocks from Teensy</p>

  3300. 	</div>

  3301. 	<h3>Audio Connections</h3>

  3302. 	<p>This object has no audio inputs or outputs.  Separate i2s objects

  3303. 		are used to send and receive audio data.  I2S master mode objects

  3304. 		must be used, since this control object configures the WM8731 into

  3305. 		slave mode.

  3306. 	</p>

  3307. 	<h3>Functions</h3>

  3308. 	<p class=func><span class=keyword>enable</span>();</p>

  3309. 	<p class=desc>blah blah blah blah

  3310. 	</p>

  3311. 	<p class=func><span class=keyword>disable</span>();</p>

  3312. 	<p class=desc>not implemented

  3313. 	</p>

  3314. 	<p class=func><span class=keyword>volume</span>(level);</p>

  3315. 	<p class=desc>blah blah blah blah

  3316. 	</p>

  3317. 	<p class=func><span class=keyword>inputLevel</span>(level);</p>

  3318. 	<p class=desc>not implemented

  3319. 	</p>

  3320. 	<p class=func><span class=keyword>inputSelect</span>(input);</p>

  3321. 	<p class=desc>not implemented

  3322. 	</p>

  3323. 	<!--

  3324. <h3>Examples</h3>

  3325. 	<p class=exam>File &gt; Examples &gt; Audio &gt;

  3326. 	</p>

  3327. -->

  3328. 	<h3>Notes</h3>

  3329. 	<p></p>

  3330. </script>

  3331. <script type="text/x-red" data-template-name="AudioControlWM8731">

  3332. 	<div class="form-row">

  3333. 		<label for="node-input-name"><i class="fa fa-tag"></i> Name</label>

  3334. 		<input type="text" id="node-input-name" placeholder="Name">

  3335. 	</div>

  3336. </script>

  3337. 

  3338. <script type="text/x-red" data-help-name="AudioControlWM8731master">

  3339. 	<h3>Summary</h3>

  3340. 	<div class=tooltipinfo>

  3341. 	<p>Control a WM8731 chip in master mode, where it controls all I2S timing.</p>

  3342. 	</div>

  3343. 	<h3>Audio Connections</h3>

  3344. 	<p>This object has no audio inputs or outputs.  Separate i2s objects

  3345. 		are used to send and receive audio data.  I2S slave mode objects

  3346. 		must be used, since this control object configures the WM8731 into

  3347. 		master mode.

  3348. 	</p>

  3349. 	<h3>Functions</h3>

  3350. 	<p class=func><span class=keyword>enable</span>();</p>

  3351. 	<p class=desc>blah blah blah blah

  3352. 	</p>

  3353. 	<p class=func><span class=keyword>disable</span>();</p>

  3354. 	<p class=desc>not implemented

  3355. 	</p>

  3356. 	<p class=func><span class=keyword>volume</span>(level);</p>

  3357. 	<p class=desc>blah blah blah blah

  3358. 	</p>

  3359. 	<p class=func><span class=keyword>inputLevel</span>(level);</p>

  3360. 	<p class=desc>not implemented

  3361. 	</p>

  3362. 	<p class=func><span class=keyword>inputSelect</span>(input);</p>

  3363. 	<p class=desc>not implemented

  3364. 	</p>

  3365. 	<h3>Examples</h3>

  3366. 	<p class=exam>File &gt; Examples &gt; Audio &gt; HardwareTesting &gt; WM8731MikroSine

  3367. 	</p>

  3368. 	<h3>Notes</h3>

  3369. 	<p></p>

  3370. </script>

  3371. <script type="text/x-red" data-template-name="AudioControlWM8731master">

  3372. 	<div class="form-row">

  3373. 		<label for="node-input-name"><i class="fa fa-tag"></i> Name</label>

  3374. 		<input type="text" id="node-input-name" placeholder="Name">

  3375. 	</div>

  3376. </script>

  3377. 

  3378. <script type="text/x-red" data-help-name="AudioControlAK4558">

  3379. 	<h3>Summary</h3>

  3380. 	<div class=tooltipinfo>

  3381. 	<p>Control the AK4558 chip on the <a href="https://hackaday.io/project/8567-hifi-audio-codec-module" target="_blank">HiFi Audio CODEC Module</a>

  3382. 	in slave mode, where the Teensy controls all I2S timing.</p>

  3383. 	</div>

  3384. 	<h3>Audio Connections</h3>

  3385. 	<p>This object has no audio inputs or outputs.  Separate I2S objects

  3386. 		are used to send and receive audio data.

  3387. 	</p>

  3388. 	<h3>Functions</h3>

  3389. 	<p class=func><span class=keyword>enable</span>();</p>

  3390. 	<p class=desc>Enables the CODEC to work with 44.1 KHz - 16 bit data. This function does not enable the ADC/DAC modules.

  3391. 	</p>

  3392. 	<p class=func><span class=keyword>enableIn</span>();</p>

  3393. 	<p class=desc>Enables the ADC module.

  3394. 	</p>

  3395. 	<p class=func><span class=keyword>enableOut</span>();</p>

  3396. 	<p class=desc>Enables the DAC module.

  3397. 	</p>

  3398. 	<p class=func><span class=keyword>disable</span>();</p>

  3399. 	<p class=desc>Disables the ADC and the DAC modules.

  3400. 	</p>

  3401. 	<p class=func><span class=keyword>disableIn</span>();</p>

  3402. 	<p class=desc>Disable the ADC module.

  3403. 	</p>

  3404. 	<p class=func><span class=keyword>disableOut</span>();</p>

  3405. 	<p class=desc>Disable the DAC module.

  3406. 	</p>

  3407. 	<p class=func><span class=keyword>volume</span>(level);</p>

  3408. 	<p class=desc>Accepts a float in range 0.0-1.0 and sets the line output volume accordingly.

  3409. 	</p>

  3410. 	<p class=func><span class=keyword>volumeLeft</span>(level);</p>

  3411. 	<p class=desc>Accepts a float in range 0.0-1.0 and sets the left line output volume accordingly.

  3412. 	</p>

  3413. 	<p class=func><span class=keyword>volumeRight</span>(level);</p>

  3414. 	<p class=desc>Accepts a float in range 0.0-1.0 and sets the right line output volume accordingly.

  3415. 	</p>

  3416. 	<p class=func><span class=keyword>inputLevel</span>(level);</p>

  3417. 	<p class=desc>NOT SUPPORTED BY THE AK4558

  3418. 	</p>

  3419. 	<p class=func><span class=keyword>inputSelect</span>(input);</p>

  3420. 	<p class=desc>not implemented yet

  3421. 	</p>

  3422. 	<h3>Examples</h3>

  3423. 	<p class=exam>File &gt; Examples &gt; Audio &gt; HardwareTesting &gt; AK4558 &gt; PassthroughTest

  3424. 	</p>

  3425. 	<p class=exam>File &gt; Examples &gt; Audio &gt; HardwareTesting &gt; AK4558 &gt; SineOutTest

  3426. 	</p>

  3427. 	<h3>Notes</h3>

  3428. 	<p>TODO: Implement inputSelect() function to enable mono left, mono right, stereo operation.</p>

  3429. 	<p>TODO: Implement ADC and DAC filters control.</p>

  3430. 	<p>TODO: Implement DAC level attenuator attack rate modifier.</p>

  3431. </script>

  3432. <script type="text/x-red" data-template-name="AudioControlAK4558">

  3433. 	<div class="form-row">

  3434. 		<label for="node-input-name"><i class="fa fa-tag"></i> Name</label>

  3435. 		<input type="text" id="node-input-name" placeholder="Name">

  3436. 	</div>

  3437. </script>

  3438. 

  3439. <script type="text/x-red" data-help-name="AudioControlCS4272">

  3440. 	<h3>Summary</h3>

  3441. 	<div class=tooltipinfo>

  3442. 	<p>Control the CS4272 chip on the <a href="https://hackaday.io/project/5912-teensy-super-audio-board" target="_blank">Super Audio Board</a>.

  3443. 	</p>

  3444. 	<p>TODO: does this control object put the CS4272 into I2S master or slave mode</p>

  3445. 	</div>

  3446. 	<h3>Audio Connections</h3>

  3447. 	<p>This object has no audio inputs or outputs.  Separate I2S objects

  3448. 		are used to send and receive audio data.

  3449. 	</p>

  3450. 	<h3>Functions</h3>

  3451. 	<p class=func><span class=keyword>enable</span>();</p>

  3452. 	<p class=desc>Enables the CODEC to work with 44.1 KHz - 16 bit data. This function does not enable the ADC/DAC modules.

  3453. 	</p>

  3454. 	<p class=func><span class=keyword>volume</span>(vol);</p>

  3455. 	<p class=desc>Set the volume level. Range is 0 to 1.0.

  3456. 	</p>

  3457. 	<p class=func><span class=keyword>volume</span>(left, right);</p>

  3458. 	<p class=desc>Set the volume level. Range is 0 to 1.0.

  3459. 	</p>

  3460. 	<p class=func><span class=keyword>dacVolume</span>(vol);</p>

  3461. 	<p class=desc>Set the volume level. Range is 0 to 1.0.  TODO: what's the

  3462. 		distinction between volume() and dacVolume()?

  3463. 	</p>

  3464. 	<p class=func><span class=keyword>dacVolume</span>(left, right);</p>

  3465. 	<p class=desc>Set the volume level. Range is 0 to 1.0.

  3466. 	</p>

  3467. 

  3468. 	<p class=func><span class=keyword>muteOutput</span>();</p>

  3469. 	<p class=desc>TODO: description

  3470. 	</p>

  3471. 	<p class=func><span class=keyword>unmuteOutput</span>();</p>

  3472. 	<p class=desc>TODO: description

  3473. 	</p>

  3474. 	<p class=func><span class=keyword>muteInput</span>();</p>

  3475. 	<p class=desc>TODO: description

  3476. 	</p>

  3477. 	<p class=func><span class=keyword>unmuteInput</span>();</p>

  3478. 	<p class=desc>TODO: description

  3479. 	</p>

  3480. 	<p class=func><span class=keyword>enableDither</span>();</p>

  3481. 	<p class=desc>TODO: description

  3482. 	</p>

  3483. 	<p class=func><span class=keyword>disableDither</span>();</p>

  3484. 	<p class=desc>TODO: description

  3485. 	</p>

  3486. 

  3487. 	<h3>Hardware</h3>

  3488. 	<p>Pin 2 must be connected to the CS4272 reset.  SDA &amp; SCL are used for all control.

  3489. 	</p>

  3490. 

  3491. 	<h3>Notes</h3>

  3492. </script>

  3493. <script type="text/x-red" data-template-name="AudioControlCS4272">

  3494. 	<div class="form-row">

  3495. 		<label for="node-input-name"><i class="fa fa-tag"></i> Name</label>

  3496. 		<input type="text" id="node-input-name" placeholder="Name">

  3497. 	</div>

  3498. </script>

  3499. 

  3500. 

  3501. 

  3502. 

  3503. </body>

  3504. </html>