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sinc delay working, needs optimization
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@melkercarlsson123
melkercarlsson123 authored Aug 1, 2024
1 parent aab84ad commit 03ba29f
Showing 1 changed file with 127 additions and 1 deletion.
128 changes: 127 additions & 1 deletion src/dsp/delay.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -33,4 +33,130 @@ void delay(float *out, const float *signal, const float fraction) {
}
}

#endif
#if 0

const float filter_coeffs [101][8] = {
{ 0.0000000, -0.0000002, 0.0000017, -0.0000077, 1.0000000, 0.0000077, -0.0000017, 0.0000002},
{ 0.0000000, -0.0002207, 0.0016913, -0.0076579, 0.9998608, 0.0078126, -0.0017083, 0.0002222},
{ 0.0000000, -0.0004398, 0.0033645, -0.0151593, 0.9994433, 0.0157780, -0.0034324, 0.0004457},
{ 0.0000000, -0.0006571, 0.0050183, -0.0225025, 0.9987477, 0.0238944, -0.0051712, 0.0006703},
{ 0.0000000, -0.0008724, 0.0066518, -0.0296858, 0.9977741, 0.0321596, -0.0069233, 0.0008959},
{ 0.0000000, -0.0010855, 0.0082638, -0.0367078, 0.9965230, 0.0405718, -0.0086876, 0.0011223},
{ 0.0000000, -0.0012964, 0.0098533, -0.0435669, 0.9949948, 0.0491286, -0.0104628, 0.0013493},
{ 0.0000000, -0.0015048, 0.0114193, -0.0502617, 0.9931902, 0.0578280, -0.0122476, 0.0015767},
{ 0.0000000, -0.0017105, 0.0129607, -0.0567908, 0.9911097, 0.0666675, -0.0140407, 0.0018043},
{ 0.0000000, -0.0019136, 0.0144765, -0.0631531, 0.9887541, 0.0756449, -0.0158408, 0.0020319},
{ 0.0000000, -0.0021137, 0.0159658, -0.0693473, 0.9861243, 0.0847578, -0.0176464, 0.0022595},
{ 0.0000000, -0.0023108, 0.0174277, -0.0753722, 0.9832214, 0.0940036, -0.0194563, 0.0024867},
{ 0.0000000, -0.0025046, 0.0188613, -0.0812269, 0.9800463, 0.1033797, -0.0212691, 0.0027134},
{ 0.0000000, -0.0026952, 0.0202656, -0.0869105, 0.9766003, 0.1128837, -0.0230833, 0.0029393},
{ 0.0000000, -0.0028823, 0.0216399, -0.0924219, 0.9728846, 0.1225127, -0.0248975, 0.0031644},
{ 0.0000000, -0.0030657, 0.0229832, -0.0977604, 0.9689006, 0.1322641, -0.0267102, 0.0033884},
{ 0.0000000, -0.0032455, 0.0242949, -0.1029253, 0.9646499, 0.1421349, -0.0285201, 0.0036111},
{ 0.0000000, -0.0034213, 0.0255741, -0.1079158, 0.9601339, 0.1521223, -0.0303255, 0.0038324},
{ 0.0000000, -0.0035932, 0.0268200, -0.1127315, 0.9553545, 0.1622234, -0.0321251, 0.0040519},
{ 0.0000000, -0.0037610, 0.0280321, -0.1173718, 0.9503133, 0.1724351, -0.0339173, 0.0042696},
{ 0.0000000, -0.0039246, 0.0292095, -0.1218362, 0.9450122, 0.1827544, -0.0357005, 0.0044852},
{ 0.0000000, -0.0040838, 0.0303516, -0.1261245, 0.9394533, 0.1931780, -0.0374732, 0.0046985},
{ 0.0000000, -0.0042386, 0.0314577, -0.1302363, 0.9336386, 0.2037029, -0.0392338, 0.0049094},
{ 0.0000000, -0.0043888, 0.0325274, -0.1341714, 0.9275703, 0.2143257, -0.0409808, 0.0051176},
{ 0.0000000, -0.0045344, 0.0335598, -0.1379297, 0.9212506, 0.2250431, -0.0427125, 0.0053230},
{ 0.0000000, -0.0046752, 0.0345547, -0.1415111, 0.9146820, 0.2358518, -0.0444274, 0.0055252},
{ 0.0000000, -0.0048112, 0.0355113, -0.1449156, 0.9078669, 0.2467483, -0.0461238, 0.0057242},
{ 0.0000000, -0.0049422, 0.0364291, -0.1481435, 0.9008078, 0.2577290, -0.0478001, 0.0059198},
{ 0.0000000, -0.0050682, 0.0373079, -0.1511947, 0.8935074, 0.2687905, -0.0494546, 0.0061117},
{ 0.0000000, -0.0051891, 0.0381469, -0.1540696, 0.8859685, 0.2799292, -0.0510857, 0.0062997},
{ 0.0000000, -0.0053048, 0.0389460, -0.1567684, 0.8781939, 0.2911414, -0.0526916, 0.0064837},
{ 0.0000000, -0.0054153, 0.0397046, -0.1592916, 0.8701864, 0.3024233, -0.0542708, 0.0066634},
{ 0.0000000, -0.0055203, 0.0404224, -0.1616397, 0.8619493, 0.3137712, -0.0558215, 0.0068386},
{ 0.0000000, -0.0056200, 0.0410992, -0.1638131, 0.8534854, 0.3251813, -0.0573420, 0.0070093},
{ 0.0000000, -0.0057142, 0.0417345, -0.1658125, 0.8447981, 0.3366497, -0.0588305, 0.0071750},
{ 0.0000000, -0.0058029, 0.0423281, -0.1676386, 0.8358906, 0.3481725, -0.0602854, 0.0073357},
{ 0.0000000, -0.0058860, 0.0428797, -0.1692921, 0.8267664, 0.3597457, -0.0617050, 0.0074912},
{ 0.0000000, -0.0059634, 0.0433893, -0.1707738, 0.8174288, 0.3713654, -0.0630874, 0.0076413},
{ 0.0000000, -0.0060351, 0.0438564, -0.1720848, 0.8078814, 0.3830274, -0.0644310, 0.0077858},
{ 0.0000000, -0.0061011, 0.0442811, -0.1732258, 0.7981278, 0.3947276, -0.0657340, 0.0079245},
{ 0.0000000, -0.0061613, 0.0446631, -0.1741980, 0.7881718, 0.4064620, -0.0669946, 0.0080571},
{ 0.0000000, -0.0062157, 0.0450023, -0.1750025, 0.7780171, 0.4182262, -0.0682111, 0.0081836},
{ 0.0000000, -0.0062643, 0.0452987, -0.1756404, 0.7676676, 0.4300162, -0.0693816, 0.0083038},
{ 0.0000000, -0.0063069, 0.0455523, -0.1761131, 0.7571273, 0.4418275, -0.0705045, 0.0084174},
{ 0.0000000, -0.0063436, 0.0457629, -0.1764218, 0.7464001, 0.4536560, -0.0715779, 0.0085243},
{ 0.0000000, -0.0063745, 0.0459306, -0.1765679, 0.7354903, 0.4654972, -0.0726000, 0.0086243},
{ 0.0000000, -0.0063993, 0.0460555, -0.1765529, 0.7244019, 0.4773468, -0.0735691, 0.0087172},
{ 0.0000000, -0.0064182, 0.0461375, -0.1763783, 0.7131393, 0.4892003, -0.0744834, 0.0088029},
{ 0.0000000, -0.0064312, 0.0461768, -0.1760457, 0.7017068, 0.5010533, -0.0753412, 0.0088812},
{ 0.0000000, -0.0064381, 0.0461735, -0.1755568, 0.6901088, 0.5129012, -0.0761405, 0.0089518},
{ 0.0000000, -0.0064391, 0.0461278, -0.1749132, 0.6783497, 0.5247397, -0.0768796, 0.0090148},
{ 0.0000000, -0.0064342, 0.0460397, -0.1741168, 0.6664341, 0.5365641, -0.0775568, 0.0090699},
{ 0.0000000, -0.0064232, 0.0459095, -0.1731694, 0.6543667, 0.5483699, -0.0781703, 0.0091169},
{ 0.0000000, -0.0064064, 0.0457375, -0.1720730, 0.6421520, 0.5601524, -0.0787182, 0.0091557},
{ 0.0000000, -0.0063836, 0.0455238, -0.1708294, 0.6297950, 0.5719070, -0.0791989, 0.0091861},
{ 0.0000000, -0.0063548, 0.0452687, -0.1694407, 0.6173002, 0.5836290, -0.0796104, 0.0092080},
{ 0.0000000, -0.0063202, 0.0449725, -0.1679090, 0.6046727, 0.5953139, -0.0799512, 0.0092213},
{ 0.0000000, -0.0062797, 0.0446356, -0.1662366, 0.5919174, 0.6069568, -0.0802193, 0.0092258},
{ 0.0000000, -0.0062334, 0.0442583, -0.1644255, 0.5790392, 0.6185531, -0.0804131, 0.0092213},
{ 0.0000000, -0.0061813, 0.0438410, -0.1624781, 0.5660433, 0.6300980, -0.0805307, 0.0092078},
{ 0.0000000, -0.0061234, 0.0433841, -0.1603967, 0.5529346, 0.6415867, -0.0805705, 0.0091852},
{ 0.0000000, -0.0060599, 0.0428880, -0.1581836, 0.5397185, 0.6530145, -0.0805307, 0.0091532},
{ 0.0000000, -0.0059906, 0.0423531, -0.1558414, 0.5264001, 0.6643766, -0.0804095, 0.0091118},
{ 0.0000000, -0.0059158, 0.0417800, -0.1533725, 0.5129846, 0.6756682, -0.0802053, 0.0090609},
{ 0.0000000, -0.0058354, 0.0411691, -0.1507795, 0.4994775, 0.6868844, -0.0799164, 0.0090003},
{ 0.0000000, -0.0057494, 0.0405209, -0.1480650, 0.4858840, 0.6980205, -0.0795410, 0.0089300},
{ 0.0000000, -0.0056581, 0.0398360, -0.1452315, 0.4722096, 0.7090717, -0.0790775, 0.0088498},
{ 0.0000000, -0.0055614, 0.0391150, -0.1422820, 0.4584597, 0.7200329, -0.0785242, 0.0087598},
{ 0.0000000, -0.0054594, 0.0383585, -0.1392190, 0.4446399, 0.7308996, -0.0778794, 0.0086597},
{ 0.0000000, -0.0053521, 0.0375670, -0.1360454, 0.4307557, 0.7416667, -0.0771414, 0.0085495},
{ 0.0000000, -0.0052397, 0.0367413, -0.1327640, 0.4168127, 0.7523294, -0.0763088, 0.0084292},
{ 0.0000000, -0.0051223, 0.0358819, -0.1293778, 0.4028165, 0.7628829, -0.0753798, 0.0082986},
{ 0.0000000, -0.0049999, 0.0349895, -0.1258897, 0.3887727, 0.7733224, -0.0743528, 0.0081577},
{ 0.0000000, -0.0048725, 0.0340650, -0.1223026, 0.3746872, 0.7836429, -0.0732263, 0.0080064},
{ 0.0000000, -0.0047404, 0.0331089, -0.1186197, 0.3605655, 0.7938397, -0.0719986, 0.0078448},
{ 0.0000000, -0.0046036, 0.0321220, -0.1148440, 0.3464134, 0.8039078, -0.0706683, 0.0076727},
{ 0.0000000, -0.0044622, 0.0311051, -0.1109785, 0.3322368, 0.8138426, -0.0692339, 0.0074901},
{ 0.0000000, -0.0043162, 0.0300589, -0.1070266, 0.3180415, 0.8236391, -0.0676937, 0.0072970},
{ 0.0000000, -0.0041659, 0.0289844, -0.1029912, 0.3038332, 0.8332926, -0.0660464, 0.0070933},
{ 0.0000000, -0.0040113, 0.0278822, -0.0988758, 0.2896180, 0.8427982, -0.0642904, 0.0068791},
{ 0.0000000, -0.0038525, 0.0267533, -0.0946835, 0.2754015, 0.8521511, -0.0624243, 0.0066544},
{ 0.0000000, -0.0036897, 0.0255985, -0.0904176, 0.2611899, 0.8613467, -0.0604468, 0.0064190},
{ 0.0000000, -0.0035229, 0.0244186, -0.0860816, 0.2469889, 0.8703802, -0.0583563, 0.0061732},
{ 0.0000000, -0.0033523, 0.0232146, -0.0816787, 0.2328045, 0.8792468, -0.0561516, 0.0059167},
{ 0.0000000, -0.0031780, 0.0219874, -0.0772123, 0.2186427, 0.8879418, -0.0538313, 0.0056498},
{ 0.0000000, -0.0030002, 0.0207380, -0.0726860, 0.2045094, 0.8964605, -0.0513941, 0.0053724},
{ 0.0000000, -0.0028189, 0.0194672, -0.0681031, 0.1904106, 0.9047984, -0.0488386, 0.0050845},
{ 0.0000000, -0.0026343, 0.0181760, -0.0634672, 0.1763523, 0.9129507, -0.0461637, 0.0047862},
{ 0.0000000, -0.0024465, 0.0168654, -0.0587817, 0.1623405, 0.9209128, -0.0433681, 0.0044776},
{ 0.0000000, -0.0022558, 0.0155364, -0.0540502, 0.1483811, 0.9286803, -0.0404506, 0.0041587},
{ 0.0000000, -0.0020621, 0.0141900, -0.0492762, 0.1344802, 0.9362485, -0.0374099, 0.0038296},
{ 0.0000000, -0.0018657, 0.0128272, -0.0444634, 0.1206437, 0.9436129, -0.0342451, 0.0034904},
{ 0.0000000, -0.0016667, 0.0114491, -0.0396154, 0.1068777, 0.9507692, -0.0309549, 0.0031411},
{ 0.0000000, -0.0014653, 0.0100567, -0.0347357, 0.0931880, 0.9577127, -0.0275384, 0.0027819},
{ 0.0000000, -0.0012616, 0.0086510, -0.0298280, 0.0795807, 0.9644393, -0.0239943, 0.0024129},
{ 0.0000000, -0.0010557, 0.0072332, -0.0248960, 0.0660618, 0.9709444, -0.0203219, 0.0020342},
{ 0.0000000, -0.0008479, 0.0058043, -0.0199433, 0.0526372, 0.9772238, -0.0165200, 0.0016459},
{ 0.0000000, -0.0006382, 0.0043654, -0.0149737, 0.0393128, 0.9832733, -0.0125877, 0.0012482},
{ 0.0000000, -0.0004269, 0.0029177, -0.0099908, 0.0260945, 0.9890886, -0.0085242, 0.0008412},
{ 0.0000000, -0.0002141, 0.0014622, -0.0049983, 0.0129883, 0.9946655, -0.0043286, 0.0004251},
{ 0.0000000, -0.0000002, 0.0000015, -0.0000050, 0.0000129, 0.9999948, -0.0000044, 0.0000004}
};


#define COEFF_SIZE 8 // Filter coefficient size (assuming it is 8)

void delay(float *out, const float *signal, const float fraction) {
float get_filter = (1-fraction) * 100.0f + 0.5f;
int delay_int = (int)get_filter;

for (int n = 0; n < N_SAMPLES; ++n) {
for(int i = 0; i < 8; ++i){

out[n] += filter_coeffs[delay_int][i]*signal[n+i];

}

}

}

#endif

#endif

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