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teensy-audio/data_windows.c

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  1. /* Audio Library for Teensy 3.X

  2.  * Copyright (c) 2014, Paul Stoffregen, paul@pjrc.com

  3.  *

  4.  * Development of this audio library was funded by PJRC.COM, LLC by sales of

  5.  * Teensy and Audio Adaptor boards.  Please support PJRC's efforts to develop

  6.  * open source software by purchasing Teensy or other PJRC products.

  7.  *

  8.  * Permission is hereby granted, free of charge, to any person obtaining a copy

  9.  * of this software and associated documentation files (the "Software"), to deal

  10.  * in the Software without restriction, including without limitation the rights

  11.  * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell

  12.  * copies of the Software, and to permit persons to whom the Software is

  13.  * furnished to do so, subject to the following conditions:

  14.  *

  15.  * The above copyright notice, development funding notice, and this permission

  16.  * notice shall be included in all copies or substantial portions of the Software.

  17.  *

  18.  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR

  19.  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,

  20.  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE

  21.  * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER

  22.  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,

  23.  * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN

  24.  * THE SOFTWARE.

  25.  */

  26. 

  27. #include <stdint.h>

  28. 

  29. const int16_t AudioWindowHanning256[] __attribute__ ((aligned (4))) = {

  30.      0,     5,    20,    45,    80,   124,   179,   243,   317,   401,

  31.    495,   598,   711,   833,   965,  1106,  1257,  1416,  1585,  1763,

  32.   1949,  2145,  2349,  2561,  2782,  3011,  3249,  3494,  3747,  4008,

  33.   4276,  4552,  4834,  5124,  5421,  5724,  6034,  6350,  6672,  7000,

  34.   7334,  7673,  8018,  8367,  8722,  9081,  9445,  9812, 10184, 10560,

  35.  10939, 11321, 11707, 12095, 12486, 12879, 13274, 13672, 14070, 14471,

  36.  14872, 15275, 15678, 16081, 16485, 16889, 17292, 17695, 18097, 18498,

  37.  18897, 19295, 19692, 20086, 20478, 20868, 21255, 21639, 22019, 22397,

  38.  22770, 23140, 23506, 23867, 24224, 24576, 24923, 25265, 25602, 25932,

  39.  26258, 26577, 26890, 27196, 27496, 27789, 28076, 28355, 28627, 28892,

  40.  29148, 29398, 29639, 29872, 30097, 30314, 30522, 30722, 30913, 31095,

  41.  31268, 31432, 31588, 31733, 31870, 31997, 32115, 32223, 32321, 32410,

  42.  32489, 32558, 32618, 32667, 32707, 32737, 32757, 32767, 32767, 32757,

  43.  32737, 32707, 32667, 32618, 32558, 32489, 32410, 32321, 32223, 32115,

  44.  31997, 31870, 31733, 31588, 31432, 31268, 31095, 30913, 30722, 30522,

  45.  30314, 30097, 29872, 29639, 29398, 29148, 28892, 28627, 28355, 28076,

  46.  27789, 27496, 27196, 26890, 26577, 26258, 25932, 25602, 25265, 24923,

  47.  24576, 24224, 23867, 23506, 23140, 22770, 22397, 22019, 21639, 21255,

  48.  20868, 20478, 20086, 19692, 19295, 18897, 18498, 18097, 17695, 17292,

  49.  16889, 16485, 16081, 15678, 15275, 14872, 14471, 14070, 13672, 13274,

  50.  12879, 12486, 12095, 11707, 11321, 10939, 10560, 10184,  9812,  9445,

  51.   9081,  8722,  8367,  8018,  7673,  7334,  7000,  6672,  6350,  6034,

  52.   5724,  5421,  5124,  4834,  4552,  4276,  4008,  3747,  3494,  3249,

  53.   3011,  2782,  2561,  2349,  2145,  1949,  1763,  1585,  1416,  1257,

  54.   1106,   965,   833,   711,   598,   495,   401,   317,   243,   179,

  55.    124,    80,    45,    20,     5,     0,

  56. };

  57. 

  58. const int16_t AudioWindowBartlett256[] __attribute__ ((aligned (4))) = {

  59.    128,   384,   640,   896,  1152,  1408,  1664,  1920,  2176,  2432,

  60.   2688,  2944,  3200,  3456,  3712,  3968,  4224,  4480,  4736,  4992,

  61.   5248,  5504,  5760,  6016,  6272,  6528,  6784,  7040,  7296,  7552,

  62.   7808,  8064,  8320,  8576,  8832,  9088,  9344,  9600,  9856, 10112,

  63.  10368, 10624, 10880, 11136, 11392, 11648, 11904, 12160, 12416, 12672,

  64.  12928, 13184, 13440, 13696, 13952, 14208, 14464, 14720, 14976, 15232,

  65.  15488, 15744, 16000, 16256, 16512, 16768, 17024, 17280, 17536, 17792,

  66.  18048, 18304, 18560, 18816, 19072, 19328, 19584, 19840, 20096, 20352,

  67.  20608, 20864, 21120, 21376, 21632, 21888, 22144, 22400, 22656, 22912,

  68.  23168, 23424, 23680, 23936, 24192, 24448, 24704, 24960, 25216, 25472,

  69.  25728, 25984, 26240, 26496, 26752, 27008, 27264, 27520, 27776, 28032,

  70.  28288, 28544, 28800, 29056, 29312, 29568, 29824, 30080, 30336, 30592,

  71.  30848, 31104, 31360, 31616, 31872, 32128, 32384, 32640, 32640, 32384,

  72.  32128, 31872, 31616, 31360, 31104, 30848, 30592, 30336, 30080, 29824,

  73.  29568, 29312, 29056, 28800, 28544, 28288, 28032, 27776, 27520, 27264,

  74.  27008, 26752, 26496, 26240, 25984, 25728, 25472, 25216, 24960, 24704,

  75.  24448, 24192, 23936, 23680, 23424, 23168, 22912, 22656, 22400, 22144,

  76.  21888, 21632, 21376, 21120, 20864, 20608, 20352, 20096, 19840, 19584,

  77.  19328, 19072, 18816, 18560, 18304, 18048, 17792, 17536, 17280, 17024,

  78.  16768, 16512, 16256, 16000, 15744, 15488, 15232, 14976, 14720, 14464,

  79.  14208, 13952, 13696, 13440, 13184, 12928, 12672, 12416, 12160, 11904,

  80.  11648, 11392, 11136, 10880, 10624, 10368, 10112,  9856,  9600,  9344,

  81.   9088,  8832,  8576,  8320,  8064,  7808,  7552,  7296,  7040,  6784,

  82.   6528,  6272,  6016,  5760,  5504,  5248,  4992,  4736,  4480,  4224,

  83.   3968,  3712,  3456,  3200,  2944,  2688,  2432,  2176,  1920,  1664,

  84.   1408,  1152,   896,   640,   384,   128,

  85. };

  86. 

  87. const int16_t AudioWindowBlackman256[] __attribute__ ((aligned (4))) = {

  88.      0,     2,     7,    16,    29,    45,    65,    89,   116,   148,

  89.    183,   222,   266,   314,   366,   422,   483,   549,   620,   695,

  90.    776,   862,   953,  1050,  1153,  1261,  1376,  1496,  1623,  1757,

  91.   1897,  2043,  2197,  2358,  2526,  2701,  2883,  3074,  3272,  3477,

  92.   3691,  3912,  4142,  4380,  4626,  4880,  5142,  5413,  5692,  5979,

  93.   6275,  6579,  6891,  7211,  7540,  7876,  8220,  8572,  8932,  9299,

  94.   9674, 10056, 10445, 10840, 11242, 11651, 12065, 12485, 12911, 13342,

  95.  13778, 14218, 14662, 15111, 15563, 16017, 16475, 16935, 17397, 17860,

  96.  18324, 18789, 19253, 19718, 20182, 20644, 21104, 21563, 22018, 22470,

  97.  22919, 23363, 23802, 24237, 24665, 25087, 25503, 25911, 26312, 26704,

  98.  27088, 27462, 27828, 28183, 28527, 28861, 29183, 29494, 29793, 30079,

  99.  30352, 30613, 30859, 31092, 31311, 31515, 31705, 31880, 32039, 32183,

  100.  32312, 32425, 32522, 32603, 32668, 32717, 32750, 32766, 32766, 32750,

  101.  32717, 32668, 32603, 32522, 32425, 32312, 32183, 32039, 31880, 31705,

  102.  31515, 31311, 31092, 30859, 30613, 30352, 30079, 29793, 29494, 29183,

  103.  28861, 28527, 28183, 27828, 27462, 27088, 26704, 26312, 25911, 25503,

  104.  25087, 24665, 24237, 23802, 23363, 22919, 22470, 22018, 21563, 21104,

  105.  20644, 20182, 19718, 19253, 18789, 18324, 17860, 17397, 16935, 16475,

  106.  16017, 15563, 15111, 14662, 14218, 13778, 13342, 12911, 12485, 12065,

  107.  11651, 11242, 10840, 10445, 10056,  9674,  9299,  8932,  8572,  8220,

  108.   7876,  7540,  7211,  6891,  6579,  6275,  5979,  5692,  5413,  5142,

  109.   4880,  4626,  4380,  4142,  3912,  3691,  3477,  3272,  3074,  2883,

  110.   2701,  2526,  2358,  2197,  2043,  1897,  1757,  1623,  1496,  1376,

  111.   1261,  1153,  1050,   953,   862,   776,   695,   620,   549,   483,

  112.    422,   366,   314,   266,   222,   183,   148,   116,    89,    65,

  113.     45,    29,    16,     7,     2,     0,

  114. };

  115. 

  116. const int16_t AudioWindowFlattop256[] __attribute__ ((aligned (4))) = {

  117.      0,     0,    -1,    -3,    -6,    -9,   -14,   -20,   -27,   -35,

  118.    -45,   -56,   -68,   -83,   -99,  -117,  -137,  -160,  -185,  -213,

  119.   -243,  -276,  -312,  -351,  -393,  -438,  -487,  -538,  -593,  -651,

  120.   -713,  -777,  -844,  -914,  -987, -1062, -1139, -1218, -1298, -1380,

  121.  -1462, -1544, -1626, -1707, -1787, -1865, -1939, -2010, -2077, -2139,

  122.  -2194, -2243, -2284, -2316, -2339, -2351, -2352, -2339, -2314, -2273,

  123.  -2217, -2144, -2054, -1945, -1817, -1668, -1498, -1306, -1090,  -851,

  124.   -588,  -300,    13,   352,   718,  1111,  1530,  1976,  2449,  2949,

  125.   3475,  4027,  4605,  5209,  5837,  6489,  7163,  7860,  8577,  9313,

  126.  10068, 10840, 11626, 12426, 13238, 14059, 14889, 15724, 16563, 17404,

  127.  18244, 19082, 19914, 20740, 21555, 22358, 23147, 23920, 24673, 25405,

  128.  26113, 26796, 27451, 28076, 28669, 29228, 29752, 30238, 30685, 31092,

  129.  31458, 31780, 32058, 32291, 32479, 32620, 32715, 32762, 32762, 32715,

  130.  32620, 32479, 32291, 32058, 31780, 31458, 31092, 30685, 30238, 29752,

  131.  29228, 28669, 28076, 27451, 26796, 26113, 25405, 24673, 23920, 23147,

  132.  22358, 21555, 20740, 19914, 19082, 18244, 17404, 16563, 15724, 14889,

  133.  14059, 13238, 12426, 11626, 10840, 10068,  9313,  8577,  7860,  7163,

  134.   6489,  5837,  5209,  4605,  4027,  3475,  2949,  2449,  1976,  1530,

  135.   1111,   718,   352,    13,  -300,  -588,  -851, -1090, -1306, -1498,

  136.  -1668, -1817, -1945, -2054, -2144, -2217, -2273, -2314, -2339, -2352,

  137.  -2351, -2339, -2316, -2284, -2243, -2194, -2139, -2077, -2010, -1939,

  138.  -1865, -1787, -1707, -1626, -1544, -1462, -1380, -1298, -1218, -1139,

  139.  -1062,  -987,  -914,  -844,  -777,  -713,  -651,  -593,  -538,  -487,

  140.   -438,  -393,  -351,  -312,  -276,  -243,  -213,  -185,  -160,  -137,

  141.   -117,   -99,   -83,   -68,   -56,   -45,   -35,   -27,   -20,   -14,

  142.     -9,    -6,    -3,    -1,     0,     0,

  143. };

  144. 

  145. const int16_t AudioWindowBlackmanHarris256[] __attribute__ ((aligned (4))) = {

  146.      2,     2,     3,     5,     7,     9,    13,    17,    22,    27,

  147.     34,    42,    51,    61,    73,    86,   101,   118,   137,   158,

  148.    181,   207,   235,   267,   301,   339,   381,   427,   476,   530,

  149.    589,   652,   721,   795,   875,   961,  1053,  1151,  1257,  1369,

  150.   1489,  1617,  1752,  1896,  2049,  2210,  2380,  2560,  2749,  2948,

  151.   3156,  3375,  3605,  3845,  4096,  4357,  4630,  4914,  5209,  5516,

  152.   5833,  6162,  6503,  6855,  7218,  7592,  7978,  8374,  8781,  9199,

  153.   9628, 10066, 10514, 10972, 11439, 11915, 12400, 12892, 13392, 13899,

  154.  14413, 14932, 15457, 15987, 16521, 17058, 17599, 18141, 18685, 19229,

  155.  19774, 20318, 20860, 21400, 21936, 22468, 22996, 23518, 24033, 24541,

  156.  25041, 25532, 26012, 26482, 26941, 27387, 27821, 28240, 28645, 29034,

  157.  29408, 29765, 30104, 30426, 30728, 31012, 31276, 31520, 31743, 31945,

  158.  32126, 32284, 32421, 32535, 32627, 32696, 32742, 32765, 32765, 32742,

  159.  32696, 32627, 32535, 32421, 32284, 32126, 31945, 31743, 31520, 31276,

  160.  31012, 30728, 30426, 30104, 29765, 29408, 29034, 28645, 28240, 27821,

  161.  27387, 26941, 26482, 26012, 25532, 25041, 24541, 24033, 23518, 22996,

  162.  22468, 21936, 21400, 20860, 20318, 19774, 19229, 18685, 18141, 17599,

  163.  17058, 16521, 15987, 15457, 14932, 14413, 13899, 13392, 12892, 12400,

  164.  11915, 11439, 10972, 10514, 10066,  9628,  9199,  8781,  8374,  7978,

  165.   7592,  7218,  6855,  6503,  6162,  5833,  5516,  5209,  4914,  4630,

  166.   4357,  4096,  3845,  3605,  3375,  3156,  2948,  2749,  2560,  2380,

  167.   2210,  2049,  1896,  1752,  1617,  1489,  1369,  1257,  1151,  1053,

  168.    961,   875,   795,   721,   652,   589,   530,   476,   427,   381,

  169.    339,   301,   267,   235,   207,   181,   158,   137,   118,   101,

  170.     86,    73,    61,    51,    42,    34,    27,    22,    17,    13,

  171.      9,     7,     5,     3,     2,     2,

  172. };

  173. 

  174. const int16_t AudioWindowNuttall256[] __attribute__ ((aligned (4))) = {

  175.      0,     0,     1,     2,     4,     6,     9,    13,    17,    22,

  176.     28,    35,    43,    52,    62,    74,    87,   102,   119,   138,

  177.    160,   183,   210,   239,   271,   306,   345,   388,   434,   485,

  178.    540,   600,   665,   735,   811,   893,   981,  1075,  1176,  1284,

  179.   1400,  1523,  1654,  1793,  1940,  2097,  2262,  2437,  2621,  2815,

  180.   3019,  3233,  3458,  3693,  3939,  4196,  4465,  4744,  5035,  5338,

  181.   5651,  5977,  6314,  6663,  7023,  7394,  7777,  8171,  8577,  8993,

  182.   9420,  9857, 10305, 10762, 11229, 11705, 12190, 12683, 13184, 13693,

  183.  14208, 14730, 15257, 15789, 16326, 16867, 17411, 17958, 18506, 19055,

  184.  19604, 20153, 20700, 21245, 21787, 22325, 22858, 23386, 23908, 24422,

  185.  24927, 25424, 25911, 26388, 26853, 27305, 27744, 28170, 28581, 28976,

  186.  29355, 29717, 30062, 30388, 30696, 30984, 31252, 31499, 31726, 31932,

  187.  32115, 32276, 32415, 32532, 32625, 32695, 32742, 32765, 32765, 32742,

  188.  32695, 32625, 32532, 32415, 32276, 32115, 31932, 31726, 31499, 31252,

  189.  30984, 30696, 30388, 30062, 29717, 29355, 28976, 28581, 28170, 27744,

  190.  27305, 26853, 26388, 25911, 25424, 24927, 24422, 23908, 23386, 22858,

  191.  22325, 21787, 21245, 20700, 20153, 19604, 19055, 18506, 17958, 17411,

  192.  16867, 16326, 15789, 15257, 14730, 14208, 13693, 13184, 12683, 12190,

  193.  11705, 11229, 10762, 10305,  9857,  9420,  8993,  8577,  8171,  7777,

  194.   7394,  7023,  6663,  6314,  5977,  5651,  5338,  5035,  4744,  4465,

  195.   4196,  3939,  3693,  3458,  3233,  3019,  2815,  2621,  2437,  2262,

  196.   2097,  1940,  1793,  1654,  1523,  1400,  1284,  1176,  1075,   981,

  197.    893,   811,   735,   665,   600,   540,   485,   434,   388,   345,

  198.    306,   271,   239,   210,   183,   160,   138,   119,   102,    87,

  199.     74,    62,    52,    43,    35,    28,    22,    17,    13,     9,

  200.      6,     4,     2,     1,     0,     0,

  201. };

  202. 

  203. const int16_t AudioWindowBlackmanNuttall256[] __attribute__ ((aligned (4))) = {

  204.     12,    12,    13,    15,    18,    22,    26,    32,    38,    46,

  205.     54,    64,    76,    89,   103,   119,   137,   158,   180,   205,

  206.    232,   262,   295,   331,   371,   414,   461,   512,   567,   627,

  207.    691,   761,   836,   916,  1002,  1095,  1193,  1299,  1411,  1531,

  208.   1658,  1793,  1935,  2086,  2246,  2414,  2592,  2778,  2974,  3180,

  209.   3396,  3621,  3857,  4104,  4361,  4628,  4907,  5196,  5497,  5808,

  210.   6130,  6464,  6808,  7164,  7530,  7908,  8296,  8694,  9103,  9523,

  211.   9952, 10391, 10839, 11296, 11763, 12237, 12720, 13210, 13707, 14211,

  212.  14721, 15236, 15757, 16281, 16810, 17342, 17876, 18412, 18949, 19487,

  213.  20024, 20560, 21094, 21625, 22153, 22677, 23196, 23709, 24215, 24714,

  214.  25204, 25686, 26157, 26618, 27068, 27505, 27930, 28341, 28737, 29118,

  215.  29484, 29833, 30165, 30479, 30775, 31052, 31310, 31549, 31767, 31964,

  216.  32141, 32296, 32429, 32541, 32630, 32698, 32743, 32765, 32765, 32743,

  217.  32698, 32630, 32541, 32429, 32296, 32141, 31964, 31767, 31549, 31310,

  218.  31052, 30775, 30479, 30165, 29833, 29484, 29118, 28737, 28341, 27930,

  219.  27505, 27068, 26618, 26157, 25686, 25204, 24714, 24215, 23709, 23196,

  220.  22677, 22153, 21625, 21094, 20560, 20024, 19487, 18949, 18412, 17876,

  221.  17342, 16810, 16281, 15757, 15236, 14721, 14211, 13707, 13210, 12720,

  222.  12237, 11763, 11296, 10839, 10391,  9952,  9523,  9103,  8694,  8296,

  223.   7908,  7530,  7164,  6808,  6464,  6130,  5808,  5497,  5196,  4907,

  224.   4628,  4361,  4104,  3857,  3621,  3396,  3180,  2974,  2778,  2592,

  225.   2414,  2246,  2086,  1935,  1793,  1658,  1531,  1411,  1299,  1193,

  226.   1095,  1002,   916,   836,   761,   691,   627,   567,   512,   461,

  227.    414,   371,   331,   295,   262,   232,   205,   180,   158,   137,

  228.    119,   103,    89,    76,    64,    54,    46,    38,    32,    26,

  229.     22,    18,    15,    13,    12,    12,

  230. };

  231. 

  232. const int16_t AudioWindowWelch256[] __attribute__ ((aligned (4))) = {

  233.    256,   764,  1268,  1768,  2264,  2756,  3244,  3728,  4208,  4684,

  234.   5156,  5624,  6088,  6548,  7004,  7456,  7904,  8348,  8788,  9224,

  235.   9656, 10084, 10508, 10928, 11344, 11756, 12164, 12568, 12968, 13364,

  236.  13756, 14144, 14528, 14908, 15284, 15656, 16024, 16388, 16748, 17104,

  237.  17456, 17804, 18148, 18488, 18824, 19156, 19484, 19808, 20128, 20444,

  238.  20756, 21064, 21368, 21668, 21964, 22256, 22544, 22828, 23108, 23384,

  239.  23656, 23924, 24188, 24448, 24704, 24956, 25204, 25448, 25688, 25924,

  240.  26156, 26384, 26608, 26828, 27044, 27256, 27464, 27668, 27868, 28064,

  241.  28256, 28444, 28628, 28808, 28984, 29156, 29324, 29488, 29648, 29804,

  242.  29956, 30104, 30248, 30388, 30524, 30656, 30784, 30908, 31028, 31144,

  243.  31256, 31364, 31468, 31568, 31664, 31756, 31844, 31928, 32008, 32084,

  244.  32156, 32224, 32288, 32348, 32404, 32456, 32504, 32548, 32588, 32624,

  245.  32656, 32684, 32708, 32728, 32744, 32756, 32764, 32767, 32767, 32764,

  246.  32756, 32744, 32728, 32708, 32684, 32656, 32624, 32588, 32548, 32504,

  247.  32456, 32404, 32348, 32288, 32224, 32156, 32084, 32008, 31928, 31844,

  248.  31756, 31664, 31568, 31468, 31364, 31256, 31144, 31028, 30908, 30784,

  249.  30656, 30524, 30388, 30248, 30104, 29956, 29804, 29648, 29488, 29324,

  250.  29156, 28984, 28808, 28628, 28444, 28256, 28064, 27868, 27668, 27464,

  251.  27256, 27044, 26828, 26608, 26384, 26156, 25924, 25688, 25448, 25204,

  252.  24956, 24704, 24448, 24188, 23924, 23656, 23384, 23108, 22828, 22544,

  253.  22256, 21964, 21668, 21368, 21064, 20756, 20444, 20128, 19808, 19484,

  254.  19156, 18824, 18488, 18148, 17804, 17456, 17104, 16748, 16388, 16024,

  255.  15656, 15284, 14908, 14528, 14144, 13756, 13364, 12968, 12568, 12164,

  256.  11756, 11344, 10928, 10508, 10084,  9656,  9224,  8788,  8348,  7904,

  257.   7456,  7004,  6548,  6088,  5624,  5156,  4684,  4208,  3728,  3244,

  258.   2756,  2264,  1768,  1268,   764,   256,

  259. };

  260. 

  261. const int16_t AudioWindowHamming256[] __attribute__ ((aligned (4))) = {

  262.   2621,  2626,  2640,  2663,  2695,  2736,  2786,  2845,  2913,  2991,

  263.   3077,  3172,  3276,  3388,  3509,  3639,  3778,  3925,  4080,  4243,

  264.   4415,  4595,  4782,  4978,  5181,  5392,  5610,  5836,  6069,  6309,

  265.   6555,  6809,  7069,  7336,  7609,  7888,  8173,  8464,  8760,  9062,

  266.   9369,  9681,  9998, 10319, 10646, 10976, 11310, 11649, 11991, 12336,

  267.  12685, 13037, 13391, 13749, 14108, 14470, 14834, 15199, 15566, 15935,

  268.  16304, 16674, 17045, 17416, 17788, 18159, 18530, 18900, 19270, 19639,

  269.  20007, 20373, 20738, 21101, 21461, 21820, 22176, 22529, 22879, 23226,

  270.  23570, 23910, 24247, 24579, 24907, 25231, 25551, 25865, 26175, 26479,

  271.  26778, 27072, 27360, 27642, 27918, 28188, 28451, 28708, 28958, 29202,

  272.  29438, 29667, 29889, 30104, 30311, 30510, 30702, 30886, 31061, 31229,

  273.  31388, 31539, 31682, 31816, 31942, 32059, 32167, 32266, 32357, 32439,

  274.  32511, 32575, 32630, 32675, 32712, 32739, 32758, 32767, 32767, 32758,

  275.  32739, 32712, 32675, 32630, 32575, 32511, 32439, 32357, 32266, 32167,

  276.  32059, 31942, 31816, 31682, 31539, 31388, 31229, 31061, 30886, 30702,

  277.  30510, 30311, 30104, 29889, 29667, 29438, 29202, 28958, 28708, 28451,

  278.  28188, 27918, 27642, 27360, 27072, 26778, 26479, 26175, 25865, 25551,

  279.  25231, 24907, 24579, 24247, 23910, 23570, 23226, 22879, 22529, 22176,

  280.  21820, 21461, 21101, 20738, 20373, 20007, 19639, 19270, 18900, 18530,

  281.  18159, 17788, 17416, 17045, 16674, 16304, 15935, 15566, 15199, 14834,

  282.  14470, 14108, 13749, 13391, 13037, 12685, 12336, 11991, 11649, 11310,

  283.  10976, 10646, 10319,  9998,  9681,  9369,  9062,  8760,  8464,  8173,

  284.   7888,  7609,  7336,  7069,  6809,  6555,  6309,  6069,  5836,  5610,

  285.   5392,  5181,  4978,  4782,  4595,  4415,  4243,  4080,  3925,  3778,

  286.   3639,  3509,  3388,  3276,  3172,  3077,  2991,  2913,  2845,  2786,

  287.   2736,  2695,  2663,  2640,  2626,  2621,

  288. };

  289. 

  290. const int16_t AudioWindowCosine256[] __attribute__ ((aligned (4))) = {

  291.      0,   404,   807,  1211,  1614,  2017,  2420,  2822,  3224,  3626,

  292.   4027,  4427,  4827,  5226,  5624,  6021,  6417,  6813,  7207,  7600,

  293.   7993,  8383,  8773,  9161,  9548,  9934, 10318, 10700, 11081, 11460,

  294.  11837, 12213, 12586, 12958, 13328, 13696, 14061, 14425, 14786, 15145,

  295.  15502, 15857, 16209, 16558, 16906, 17250, 17592, 17931, 18268, 18602,

  296.  18932, 19261, 19586, 19908, 20227, 20543, 20856, 21166, 21472, 21776,

  297.  22076, 22372, 22666, 22955, 23242, 23525, 23804, 24079, 24351, 24620,

  298.  24884, 25145, 25402, 25655, 25904, 26149, 26391, 26628, 26861, 27090,

  299.  27315, 27536, 27753, 27966, 28174, 28378, 28578, 28773, 28964, 29151,

  300.  29333, 29510, 29684, 29852, 30017, 30176, 30331, 30482, 30628, 30769,

  301.  30905, 31037, 31164, 31287, 31404, 31517, 31625, 31728, 31827, 31921,

  302.  32009, 32093, 32172, 32247, 32316, 32380, 32440, 32494, 32544, 32588,

  303.  32628, 32663, 32693, 32718, 32738, 32752, 32762, 32767, 32767, 32762,

  304.  32752, 32738, 32718, 32693, 32663, 32628, 32588, 32544, 32494, 32440,

  305.  32380, 32316, 32247, 32172, 32093, 32009, 31921, 31827, 31728, 31625,

  306.  31517, 31404, 31287, 31164, 31037, 30905, 30769, 30628, 30482, 30331,

  307.  30176, 30017, 29852, 29684, 29510, 29333, 29151, 28964, 28773, 28578,

  308.  28378, 28174, 27966, 27753, 27536, 27315, 27090, 26861, 26628, 26391,

  309.  26149, 25904, 25655, 25402, 25145, 24884, 24620, 24351, 24079, 23804,

  310.  23525, 23242, 22955, 22666, 22372, 22076, 21776, 21472, 21166, 20856,

  311.  20543, 20227, 19908, 19586, 19261, 18932, 18602, 18268, 17931, 17592,

  312.  17250, 16906, 16558, 16209, 15857, 15502, 15145, 14786, 14425, 14061,

  313.  13696, 13328, 12958, 12586, 12213, 11837, 11460, 11081, 10700, 10318,

  314.   9934,  9548,  9161,  8773,  8383,  7993,  7600,  7207,  6813,  6417,

  315.   6021,  5624,  5226,  4827,  4427,  4027,  3626,  3224,  2822,  2420,

  316.   2017,  1614,  1211,   807,   404,     0,

  317. };

  318. 

  319. const int16_t AudioWindowTukey256[] __attribute__ ((aligned (4))) = {

  320.      0,    20,    80,   179,   317,   495,   711,   965,  1257,  1585,

  321.   1949,  2349,  2782,  3249,  3747,  4276,  4834,  5421,  6034,  6672,

  322.   7334,  8018,  8722,  9445, 10184, 10939, 11707, 12486, 13274, 14070,

  323.  14872, 15678, 16485, 17292, 18097, 18897, 19692, 20478, 21255, 22019,

  324.  22770, 23506, 24224, 24923, 25602, 26258, 26890, 27496, 28076, 28627,

  325.  29148, 29639, 30097, 30522, 30913, 31268, 31588, 31870, 32115, 32321,

  326.  32489, 32618, 32707, 32757, 32767, 32767, 32767, 32767, 32767, 32767,

  327.  32767, 32767, 32767, 32767, 32767, 32767, 32767, 32767, 32767, 32767,

  328.  32767, 32767, 32767, 32767, 32767, 32767, 32767, 32767, 32767, 32767,

  329.  32767, 32767, 32767, 32767, 32767, 32767, 32767, 32767, 32767, 32767,

  330.  32767, 32767, 32767, 32767, 32767, 32767, 32767, 32767, 32767, 32767,

  331.  32767, 32767, 32767, 32767, 32767, 32767, 32767, 32767, 32767, 32767,

  332.  32767, 32767, 32767, 32767, 32767, 32767, 32767, 32767, 32767, 32767,

  333.  32767, 32767, 32767, 32767, 32767, 32767, 32767, 32767, 32767, 32767,

  334.  32767, 32767, 32767, 32767, 32767, 32767, 32767, 32767, 32767, 32767,

  335.  32767, 32767, 32767, 32767, 32767, 32767, 32767, 32767, 32767, 32767,

  336.  32767, 32767, 32767, 32767, 32767, 32767, 32767, 32767, 32767, 32767,

  337.  32767, 32767, 32767, 32767, 32767, 32767, 32767, 32767, 32767, 32767,

  338.  32767, 32767, 32767, 32767, 32767, 32767, 32767, 32767, 32767, 32767,

  339.  32767, 32767, 32757, 32707, 32618, 32489, 32321, 32115, 31870, 31588,

  340.  31268, 30913, 30522, 30097, 29639, 29148, 28627, 28076, 27496, 26890,

  341.  26258, 25602, 24923, 24224, 23506, 22770, 22019, 21255, 20478, 19692,

  342.  18897, 18097, 17292, 16485, 15678, 14872, 14070, 13274, 12486, 11707,

  343.  10939, 10184,  9445,  8722,  8018,  7334,  6672,  6034,  5421,  4834,

  344.   4276,  3747,  3249,  2782,  2349,  1949,  1585,  1257,   965,   711,

  345.    495,   317,   179,    80,    20,     0,

  346. };

  347. 

  348. /*

  349. #! /usr/bin/perl

  350. 

  351. # http://en.wikipedia.org/wiki/Window_function

  352. 

  353. use Math::Trig ':pi';

  354. $len = 256;

  355. 

  356. for ($i=0; $i < $len; $i++) {

  357. 

  358. 	$name = "Hanning";

  359. 	$val = 0.5 * (1 - cos(2 * pi * $i / ($len -1)));

  360. 

  361. 	#$name = "Bartlett";

  362. 	#$val = 1 - abs(($i - ($len - 1) / 2) / ($len / 2));

  363. 

  364. 	#$name = "Blackman";

  365. 	#$a0 = (1 - 0.16) / 2;

  366. 	#$a1 = 0.5;

  367. 	#$a2 = 0.16 / 2;

  368. 	#$val = $a0 - $a1 * cos(2 * pi * $i / ($len -1)) + $a2 * cos(4 * pi * $i / ($len -1));

  369. 

  370. 	#$name = "Flattop";

  371. 	#$a0 = 1;

  372. 	#$a1 = 1.93;

  373. 	#$a2 = 1.29;

  374. 	#$a3 = 0.388;

  375. 	#$a4 = 0.028;

  376. 	#$max = $a0 - $a1 * cos(pi) + $a2 * cos(2 * pi) - $a3 * cos(3 * pi) + $a4 * cos(4 * pi) ;

  377. 	#$val = $a0 - $a1 * cos(2 * pi * $i / ($len -1)) + $a2 * cos(4 * pi * $i / ($len -1));

  378. 	#$val += -1 * $a3 * cos(6 * pi * $i / ($len -1)) + $a4 * cos(8 * pi * $i / ($len -1));

  379. 	#$val /= $max;

  380. 

  381. 	#$name = "BlackmanHarris";

  382. 	#$a0 = 0.35875;

  383. 	#$a1 = 0.48829;

  384. 	#$a2 = 0.14128;

  385. 	#$a3 = 0.01168;

  386. 	#$a4 = 0;

  387. 	#$val = $a0 - $a1 * cos(2 * pi * $i / ($len -1)) + $a2 * cos(4 * pi * $i / ($len -1));

  388. 	#$val += -1 * $a3 * cos(6 * pi * $i / ($len -1)) + $a4 * cos(8 * pi * $i / ($len -1));

  389. 

  390. 	#$name = "Nuttall";

  391. 	#$a0 = 0.355768;

  392. 	#$a1 = 0.487396;

  393. 	#$a2 = 0.144232;

  394. 	#$a3 = 0.012604;

  395. 	#$a4 = 0;

  396. 	#$val = $a0 - $a1 * cos(2 * pi * $i / ($len -1)) + $a2 * cos(4 * pi * $i / ($len -1));

  397. 	#$val += -1 * $a3 * cos(6 * pi * $i / ($len -1)) + $a4 * cos(8 * pi * $i / ($len -1));

  398. 

  399. 	#$name = "BlackmanNuttall";

  400. 	#$a0 = 0.3635819;

  401. 	#$a1 = 0.4891775;

  402. 	#$a2 = 0.1365995;

  403. 	#$a3 = 0.0106411;

  404. 	#$a4 = 0;

  405. 	#$val = $a0 - $a1 * cos(2 * pi * $i / ($len -1)) + $a2 * cos(4 * pi * $i / ($len -1));

  406. 	#$val += -1 * $a3 * cos(6 * pi * $i / ($len -1)) + $a4 * cos(8 * pi * $i / ($len -1));

  407. 

  408. 	#$name = "Welch";

  409. 	#$val = 1 - (($i - ($len - 1) / 2) / ($len / 2)) ** 2;

  410. 

  411. 	#$name = "Hamming";

  412. 	#$val = 0.54 - 0.46 * cos(2 * pi * $i / ($len -1));

  413. 

  414. 	#$name = "Cosine";

  415. 	#$val = cos((pi * $i / ($len -1)) - (pi / 2));

  416. 

  417. 	#$name = "Tukey";

  418. 	#$a = 0.5;

  419. 	#if ($i <= ($a * ($len - 1) / 2)) {

  420. 	#	$val = 0.5 * (1 + cos(pi * ((2 * $i / ($a * ($len - 1))) - 1)));

  421. 	#} elsif ($i < (($len - 1) * (1 - $a / 2))) {

  422. 	#	$val = 0.99999;

  423. 	#} else {

  424. 	#	$val = 0.5 * (1 + cos(pi * ((2 * $i / ($a * ($len - 1))) - (2 / $a) + 1)));

  425. 	#}

  426. 

  427. 	#$name = "KaiserBessel";

  428. 	# TODO: what is the full equation, with the "zero-th order modified Bessel function"?

  429. 

  430. 	$n = int($val * 32768 + 0.5);

  431. 	$n = 32767 if $n > 32767;

  432. 

  433. 	if (0) {

  434. 		print $i;

  435. 		print "\t";

  436. 		printf "%9.6f", $val;

  437. 		print "\t";

  438. 		print $n;

  439. 		print "\n";

  440. 	} else {

  441. 		if ($i == 0) {

  442. 			print "const int16_t AudioWindow${name}${len}[] __attribute__ ((aligned (4))) = {\n";

  443. 		}

  444. 		printf "%6d", $n;

  445. 		print "," if ($i < $len);

  446. 		print "\n" if ($i % 10) == 9;

  447. 	}

  448. }

  449. print "\n" unless ($len % 10) == 9;

  450. print "};\n";

  451. */