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@@ -44,6 +44,25 @@ |
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<p>Audio from |
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master mode I2S may be used in the same project as ADC, DAC and |
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PWM signals, because all remain in sync to Teensy's timing</p> |
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<h3>Examples</h3> |
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<p class=exam>File > Examples > Audio > HardwareTesting > PassThroughStereo |
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</p> |
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<p class=exam>File > Examples > Audio > Recorder |
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</p> |
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<p class=exam>File > Examples > Audio > Analysis > PeakMeterStereo |
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</p> |
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<p class=exam>File > Examples > Audio > Analysis > FFT |
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</p> |
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<p class=exam>File > Examples > Audio > Analysis > SpectrumAnalyzerBasic |
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</p> |
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<p class=exam>File > Examples > Audio > Effects > Chorus |
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</p> |
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<p class=exam>File > Examples > Audio > Effects > Flange |
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</p> |
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<p class=exam>File > Examples > Audio > Effects > Filter |
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</p> |
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<p class=exam>File > Examples > Audio > Effects > Filter_FIR |
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</p> |
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<h3>Notes</h3> |
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<p>Normally, this object is used with the Audio Shield, which |
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is controlled separately by the "sgtl5000" object.</p> |
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@@ -92,6 +111,9 @@ |
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<tr class=odd><td align=center>13</td><td>RX</td><td>Input</td></tr> |
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<tr class=odd><td align=center>23</td><td>LRCLK</td><td>Input</td></tr> |
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</table> |
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<!--<h3>Examples</h3> |
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<p class=exam>File > Examples > Audio > |
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</p>--> |
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<h3>Notes</h3> |
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<p>Slave mode I2S <b>should not used in the same project as ADC, DAC and |
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PWM</b> signals. Differences in timing between the I2S device and |
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@@ -136,6 +158,13 @@ |
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<p>Pin A2 is used for audio input. This circuitry is recommended.</p> |
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<p align=center><img src="adccircuit.png"></p> |
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<p>Signal range is 0 to 1.2V</p> |
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<h3>Examples</h3> |
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<p class=exam>File > Examples > Audio > HardwareTesting > PassThroughMono |
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</p> |
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<p class=exam>File > Examples > Audio > Analysis > PeakMeterMono |
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</p> |
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<p class=exam>File > Examples > Audio > Analysis > DialTone_7segment |
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</p> |
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<h3>Notes</h3> |
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<p>Algorithm for automatic DC bias tracking</p> |
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<p>Noise due to high source impedance</p> |
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@@ -191,6 +220,20 @@ |
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<p>Audio from |
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master mode I2S may be used in the same project as ADC, DAC and |
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PWM signals, because all remain in sync to Teensy's timing</p> |
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<h3>Examples</h3> |
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<p>Nearly all the examples use this object. Here are some of the highlights:</p> |
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<p class=exam>File > Examples > Audio > HardwareTesting > PassThroughStereo |
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</p> |
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<p class=exam>File > Examples > Audio > SamplePlayer |
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</p> |
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<p class=exam>File > Examples > Audio > Recorder |
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</p> |
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<p class=exam>File > Examples > Audio > WavFilePlayer |
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</p> |
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<p class=exam>File > Examples > Audio > Effects > Chorus |
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</p> |
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<p class=exam>File > Examples > Audio > Synthesis > PlaySynthMusic |
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</p> |
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<h3>Notes</h3> |
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<p>Normally, this object is used with the Audio Shield, which |
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is controlled separately by the "sgtl5000" object.</p> |
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@@ -238,6 +281,9 @@ |
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<tr class=odd><td align=center>22</td><td>TX</td><td>Output</td></tr> |
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<tr class=odd><td align=center>23</td><td>LRCLK</td><td>Input</td></tr> |
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</table> |
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<h3>Examples</h3> |
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<p class=exam>File > Examples > Audio > HardwareTesting > WM8731MikroSine |
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</p> |
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<h3>Notes</h3> |
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<p>Slave mode I2S <b>should not used in the same project as ADC, DAC and |
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PWM</b> signals. Differences in timing between the I2S device and |
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@@ -284,6 +330,11 @@ |
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<p>Signal range is 0 to 1.2V</p> |
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<p>Most applications require at least a 10µF DC-blocking capacitor.</p> |
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<p>TODO: photo of Teensy 3.1 with 10µF capacitor and 3.5mm jack.</p> |
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<h3>Examples</h3> |
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<p class=exam>File > Examples > Audio > HardwareTesting > PassThroughMono |
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</p> |
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<p class=exam>File > Examples > Audio > SamplePlayer |
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</p> |
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<h3>Notes</h3> |
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<p>The output rate is 44.1 kHz (no oversampling). Ultrasonic noise present if |
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not filtered. This may not |
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@@ -332,6 +383,9 @@ |
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<p>A plastic film (Polypropylene, Polyethylene, Polyester, etc) or |
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C0G/NPO ceramic capacitor should be used for filtering. Low |
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quality ceramic (X7R, Y5V, Z5U, etc) can cause signal distortion.</p> |
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<h3>Examples</h3> |
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<p class=exam>File > Examples > Audio > HardwareTesting > PassThroughMono |
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</p> |
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<h3>Notes</h3> |
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<p>This object only works properly when Tools > CPU_Speed is set to |
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48 or 96 MHz. Other speeds aren't supported and will likely fail |
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@@ -385,6 +439,17 @@ |
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off completely. Between 0 to 1.0 attenuates the signal, and above |
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1.0 amplifies it. All 4 channels have separate settings. |
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</p> |
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<h3>Examples</h3> |
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<p class=exam>File > Examples > Audio > SamplePlayer |
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</p> |
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<p class=exam>File > Examples > Audio > Synthesis > PlaySynthMusic |
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</p> |
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<p class=exam>File > Examples > Audio > Analysis > SpectrumAnalyzerBasic |
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</p> |
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<p class=exam>File > Examples > Audio > Analysis > DialTone_Serial |
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</p> |
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<p class=exam>File > Examples > Audio > MemoryAndCpuUsage |
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</p> |
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<h3>Notes</h3> |
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<p>Signal clipping can occur when any channel has gain greater than 1.0, |
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or when multiple signals add together to greater than 1.0.</p> |
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@@ -446,6 +511,9 @@ |
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in milliseconds. When not playing, the return from this function |
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is undefined. |
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</p> |
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<h3>Examples</h3> |
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<p class=exam>File > Examples > Audio > SamplePlayer |
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</p> |
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<h3>Notes</h3> |
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<p>TODO: supported sample rates: 11.025, 22.05, 44.1</p> |
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<p>TODO: ulaw vs uncompressed encoding</p> |
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@@ -502,6 +570,9 @@ |
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in milliseconds. When not playing, the return from this function |
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is undefined. |
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</p> |
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<h3>Examples</h3> |
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<p class=exam>File > Examples > Audio > WavFilePlayer |
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</p> |
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<h3>Notes</h3> |
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<p>Only 16 bit PCM, 44100 Hz WAV files are supported. When mono |
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files are played, both output ports transmit a copy of the |
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@@ -573,6 +644,9 @@ |
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in milliseconds. When not playing, the return from this function |
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is undefined. |
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</p> |
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<h3>Examples</h3> |
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<p class=exam>File > Examples > Audio > Recorder |
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</p> |
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<h3>Notes</h3> |
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<p>The data file must be RAW 16 bit signed integers in LSB-first format. |
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</p> |
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@@ -631,6 +705,11 @@ |
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<p class=func><span class=keyword>playBuffer</span>();</p> |
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<p class=desc>Transmit the buffer previously obtained from getBuffer(). |
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</p> |
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<h3>Examples</h3> |
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<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> |
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</p> |
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<!--<p class=exam>File > Examples > Audio > |
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</p>--> |
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<h3>Notes</h3> |
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<p>TODO: many caveats....</p> |
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<p> |
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@@ -691,6 +770,9 @@ |
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<p class=desc>Stop capturing incoming audio into the queue. Data already |
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captured remains in the queue and may be read with readBuffer(). |
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</p> |
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<h3>Examples</h3> |
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<p class=exam>File > Examples > Audio > Recorder |
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</p> |
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<h3>Notes</h3> |
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<p> |
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Up to 52 packets may be queued by this object, which allows approximately |
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@@ -747,6 +829,13 @@ The actual packets are taken |
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<a href="http://www.pjrc.com/teensy/td_libs_AudioProcessorUsage.html" target="_blank">AudioNoInterrupts()</a> |
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should be used to guarantee all new settings take effect together. |
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</p> |
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<h3>Examples</h3> |
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<p class=exam>File > Examples > Audio > MemoryAndCpuUsage |
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</p> |
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<p class=exam>File > Examples > Audio > Analysis > DialTone_Serial |
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</p> |
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<p class=exam>File > Examples > Audio > Analysis > FFT |
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</p> |
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<h3>Notes</h3> |
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<p></p> |
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</script> |
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@@ -798,6 +887,9 @@ The actual packets are taken |
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<a href="http://www.pjrc.com/teensy/td_libs_AudioProcessorUsage.html" target="_blank">AudioNoInterrupts()</a> |
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should be used to guarantee all new settings take effect together. |
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</p> |
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<!--<h3>Examples</h3> |
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<p class=exam>File > Examples > Audio > |
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</p>--> |
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<h3>Notes</h3> |
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<p></p> |
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</script> |
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@@ -860,6 +952,13 @@ The actual packets are taken |
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limit your waveform data. Someday, "maxFreq" will be used to |
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do this automatically. |
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</p> |
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<h3>Examples</h3> |
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<p class=exam>File > Examples > Audio > Synthesis > PlaySynthMusic |
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</p> |
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<p class=exam>File > Examples > Audio > Synthesis > pulseWidth |
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</p> |
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<p class=exam>File > Examples > Audio > HardwareTesting > WM8731MikroSine |
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</p> |
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<h3>Notes</h3> |
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<p>Supported Waveforms:<br> |
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<ul> |
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@@ -907,6 +1006,9 @@ The actual packets are taken |
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<p class=func><span class=keyword>isPlaying</span>();</p> |
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<p class=desc>Returns true (non-zero) while the output is active. |
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</p> |
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<h3>Examples</h3> |
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<p class=exam>File > Examples > Audio > HardwareTesting > ToneSweep |
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</p> |
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<h3>Notes</h3> |
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<p>Uses excessive CPU time</p> |
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</script> |
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@@ -949,6 +1051,9 @@ The actual packets are taken |
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be specified, but periods longer than 1 second may be automatically |
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shortened for small level changes, due to numerical precision limits. |
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</p> |
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<!--<h3>Examples</h3> |
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<p class=exam>File > Examples > Audio > |
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</p>--> |
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<h3>Notes</h3> |
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<p>Of course, the term "DC", for Direct Current, doesn't properly apply |
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to a pure digital stream of numerical values. But the term is widely |
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@@ -990,6 +1095,9 @@ The actual packets are taken |
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The default is off. Noise is generated only after setting |
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to a non-zero level. |
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</p> |
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<h3>Examples</h3> |
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<p class=exam>File > Examples > Audio > |
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</p> |
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<h3>Notes</h3> |
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<p>Setting the amplitude to zero causes this object to stop using |
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CPU time to generate random numbers. |
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@@ -1032,6 +1140,9 @@ The actual packets are taken |
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The default is off. Noise is generated only after setting |
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to a non-zero level. |
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</p> |
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<h3>Examples</h3> |
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<p class=exam>File > Examples > Audio > MemoryAndCpuUsage |
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</p> |
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<h3>Notes</h3> |
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<p>Setting the amplitude to zero causes this object to stop using |
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CPU time. CPU usage is approx 3% on Teensy 3.1. |
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@@ -1080,6 +1191,9 @@ The actual packets are taken |
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<p class=desc>Begin decreasing the audio level, to reach 0 (no output) |
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after "milliseconds" time. |
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</p> |
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<!--<h3>Examples</h3> |
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<p class=exam>File > Examples > Audio > |
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</p>--> |
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<h3>Notes</h3> |
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<p>Cross fading can be built with 2 fade objects fed into a mixer. |
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When one fade object is off (fully faded out) and the other on |
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@@ -1148,6 +1262,9 @@ The actual packets are taken |
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<p class=func><span class=keyword>modify</span>(n_chorus);</p> |
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<p class=desc>Alters the number of voices in a running chorus (previously started with begin). |
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</p> |
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<h3>Examples</h3> |
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<p class=exam>File > Examples > Audio > Effects > Chorus |
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</p> |
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<h3>Notes</h3> |
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<p>The longer the length of the chorus, the more memory blocks are used.</p> |
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</script> |
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@@ -1203,6 +1320,9 @@ The actual packets are taken |
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<p class=desc>Alters the parameters in a running flanger (previously started with begin). |
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</p> |
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<h3>Examples</h3> |
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<p class=exam>File > Examples > Audio > Effects > Flange |
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</p> |
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<h3>Notes</h3> |
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<p>The longer the length of the delay buffer, the more memory blocks are used.</p> |
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<p>Try these settings:<br> |
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@@ -1281,6 +1401,13 @@ double s_freq = .0625;</p> |
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<p class=func><span class=keyword>release</span>(milliseconds);</p> |
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<p class=desc>Set the release time. The default is 30 millisecond. |
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</p> |
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<h3>Examples</h3> |
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<p class=exam>File > Examples > Audio > Synthesis > PlaySynthMusic |
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</p> |
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<p class=exam>File > Examples > Audio > Synthesis > pulseWidth |
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</p> |
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<p class=exam>File > Examples > Audio > MemoryAndCpuUsage |
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</p> |
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<h3>Notes</h3> |
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<p>To achieve the more common ADSR shape, simply |
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set delay and hold to zero.</p> |
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@@ -1327,6 +1454,9 @@ double s_freq = .0625;</p> |
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This object simply multiplies the 2 signals to create |
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a continuous output |
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</p> |
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<!--<h3>Examples</h3> |
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<p class=exam>File > Examples > Audio > |
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</p>--> |
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<h3>Notes</h3> |
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<p> |
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</p> |
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@@ -1382,6 +1512,9 @@ double s_freq = .0625;</p> |
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silent. If this channel is the longest delay, memory usage is |
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automatically reduced to accomodate only the remaining channels used. |
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</p> |
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<!--<h3>Examples</h3> |
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<p class=exam>File > Examples > Audio > |
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</p>--> |
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<h3>Notes</h3> |
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<p>Memory for the delayed signal is take from the memory pool allocated by |
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<a href="http://www.pjrc.com/teensy/td_libs_AudioConnection.html" target="_blank">AudioMemory()</a>. |
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@@ -1450,6 +1583,9 @@ double s_freq = .0625;</p> |
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should be type double. Alternately, it may be type int, where 1.0 is |
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represented with 1073741824 (2<sup>30</sup>). |
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</p> |
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<h3>Examples</h3> |
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<p class=exam>File > Examples > Audio > Effects > Filter |
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</p> |
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<h3>Notes</h3> |
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<p>Filters can with gain must have their input signals attenuated, so the |
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signal does not exceed 1.0. |
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@@ -1506,6 +1642,9 @@ double s_freq = .0625;</p> |
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<p class=func><span class=keyword>end</span>();</p> |
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<p class=desc>Turn the filter off. |
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</p> |
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<h3>Examples</h3> |
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<p class=exam>File > Examples > Audio > Effects > Filter_FIR |
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</p> |
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<h3>Notes</h3> |
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|
<p>FIR filters requires more CPU time than Biquad (IIR), but they can |
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implement filters with better phase response. |
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|
@@ -1576,6 +1715,9 @@ double s_freq = .0625;</p> |
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|
shift the filter frequency up 2.5 octaves, and a full scale negative |
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signal will shift it down 2.5 octaves. |
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</p> |
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<!--<h3>Examples</h3> |
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|
<p class=exam>File > Examples > Audio > |
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</p>--> |
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<h3>Notes</h3> |
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<p> |
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|
When controlled by a signal, the equation for the filter |
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|
@@ -1627,6 +1769,11 @@ double s_freq = .0625;</p> |
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<p class=desc>Read the highest peak value since the last read. |
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Return is from 0.0 to 1.0. |
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</p> |
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<h3>Examples</h3> |
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<p class=exam>File > Examples > Audio > Analysis > PeakMeterMono |
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</p> |
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<p class=exam>File > Examples > Audio > Analysis > PeakMeterStereo |
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</p> |
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<h3>Notes</h3> |
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<p></p> |
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</script> |
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@@ -1684,6 +1831,9 @@ double s_freq = .0625;</p> |
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signals that are not exact integer division of the sample rate. |
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</p> |
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<h3>Examples</h3> |
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<p class=exam>File > Examples > Audio > MemoryAndCpuUsage |
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</p> |
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<h3>Notes</h3> |
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<p>The raw 16 bit output data bins may be access with myFFT.output[num], where |
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num is 0 to 127.</p> |
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@@ -1756,6 +1906,11 @@ double s_freq = .0625;</p> |
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should be used for all non-periodic (music) signals, and all periodic |
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signals that are not exact integer division of the sample rate. |
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</p> |
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<h3>Examples</h3> |
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<p class=exam>File > Examples > Audio > Analysis > FFT |
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</p> |
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<p class=exam>File > Examples > Audio > Analysis > SpectrumAnalyzerBasic |
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</p> |
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<h3>Notes</h3> |
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<p>The raw 16 bit output data bins may be access with myFFT.output[num], where |
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num is 0 to 511.</p> |
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@@ -1832,6 +1987,11 @@ double s_freq = .0625;</p> |
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<p class=desc>By testing the object as a boolean value, you can respond |
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to detection of a tone. |
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</p> |
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<h3>Examples</h3> |
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<p class=exam>File > Examples > Audio > Analysis > DialTone_Serial |
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</p> |
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<p class=exam>File > Examples > Audio > Analysis > DialTone_7segment |
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</p> |
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<h3>Notes</h3> |
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<p>Low frequency detection has trouble with numerical precision. |
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Works really well for all 8 DTMF frequencies, but fails for |
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@@ -1885,6 +2045,9 @@ double s_freq = .0625;</p> |
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<p class=func><span class=keyword>length</span>(samples);</p> |
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<p class=desc>blah blah blah blah |
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</p> |
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<!--<h3>Examples</h3> |
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<p class=exam>File > Examples > Audio > |
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</p>--> |
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<h3>Notes</h3> |
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<p>This object doesn't work very well and probably should not be used.</p> |
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</script> |
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@@ -1909,7 +2072,7 @@ double s_freq = .0625;</p> |
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</script> |
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<script type="text/x-red" data-help-name="AudioControlSGTL5000"> |
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<h3>Summary</h3> |
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<p>Control the SGTL5000 chip on the audio shield |
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<p>Control the SGTL5000 chip on the |
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<a href="http://www.pjrc.com/store/teensy3_audio.html" target="_blank">audio shield</a>. |
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SGTL5000 is always used in slave mode, where Teensy controls |
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all I2S timing. |
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@@ -2209,6 +2372,22 @@ value frequency |
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<p class=desc>Enables zero or more of the already enabled parametric filters. |
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</p> |
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<h3>Examples</h3> |
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<p>Nearly all of the library's examples use this object. These |
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examples demonstrate its special features. |
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</p> |
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<p class=exam>File > Examples > Audio > HardwareTesting > PassThroughStereo |
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</p> |
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<p class=exam>File > Examples > Audio > HardwareTesting > SGTL5000 > dap_bass_enhance |
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</p> |
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<p class=exam>File > Examples > Audio > HardwareTesting > SGTL5000 > dap_avc_agc |
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</p> |
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<p class=exam>File > Examples > Audio > HardwareTesting > SGTL5000 > balanceDAC |
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</p> |
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<p class=exam>File > Examples > Audio > HardwareTesting > SGTL5000 > balanceHP |
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</p> |
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<p class=exam>File > Examples > Audio > HardwareTesting > SGTL5000 > CalcBiquadToneControlDAP |
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</p> |
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<h3>Notes</h3> |
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<p>TODO: add example with rock/classical/speech presets, where rock uses bass boost |
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and surround enhancement while speech uses bandpass filtering and auto volume control |
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@@ -2261,6 +2440,9 @@ value frequency |
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<p class=func><span class=keyword>inputSelect</span>(input);</p> |
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<p class=desc>not implemented |
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</p> |
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<!--<h3>Examples</h3> |
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<p class=exam>File > Examples > Audio > |
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</p>--> |
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<h3>Notes</h3> |
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<p></p> |
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</script> |
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@@ -2308,6 +2490,9 @@ value frequency |
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<p class=func><span class=keyword>inputSelect</span>(input);</p> |
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<p class=desc>not implemented |
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</p> |
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<h3>Examples</h3> |
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<p class=exam>File > Examples > Audio > HardwareTesting > WM8731MikroSine |
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</p> |
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<h3>Notes</h3> |
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<p></p> |
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</script> |
PaulStoffregen
10年前