ref: bf8577992e69de9182d29fe37739dbd6b5ac7354
dir: /src_SigProc_FIX/SKP_Silk_resampler_rom.c/
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/* *
* File Name: SKP_Silk_resampler_rom.c *
* *
* Description: Filter coefficients for IIR/FIR polyphase resampling *
* Total size: <600 Words (1.2 kB) *
* *
* Copyright 2010 (c), Skype Limited *
* All rights reserved. *
* */
#include "SKP_Silk_resampler_private.h"
/* Tables for 2x downsampler */
const SKP_int16 SKP_Silk_resampler_down2_0 = 9872;
const SKP_int16 SKP_Silk_resampler_down2_1 = 39809 - 65536;
/* Tables for 2x upsampler, low quality */
const SKP_int16 SKP_Silk_resampler_up2_lq_0 = 8102;
const SKP_int16 SKP_Silk_resampler_up2_lq_1 = 36783 - 65536;
/* Tables for 2x upsampler, high quality */
const SKP_int16 SKP_Silk_resampler_up2_hq_0[ 2 ] = { 4280, 33727 - 65536 };
const SKP_int16 SKP_Silk_resampler_up2_hq_1[ 2 ] = { 16295, 54015 - 65536 };
/* Matlab code for the notch filter coefficients: */
/* B = [1, 0.14, 1]; A = [1, 0.08, 0.84]; G = 0.89; freqz(G * B, A, 2^14, 16e3); axis([0, 8000, -10, 1]); */
/* fprintf('\t%6d, %6d, %6d, %6d\n', round(B(2)*2^16), round(-A(2)*2^16), round((1-A(3))*2^16), round(G*2^15)) */
const SKP_int16 SKP_Silk_resampler_up2_hq_notch[ 4 ] = { 9175, -5243, 10486, 29164 };
//const SKP_int16 SKP_Silk_resampler_up2_hq_notch[ 4 ] = { 6554, -3932, 6554, 30573 }; /* for hybrid mode? */
/* Tables with IIR and FIR coefficients for fractional downsamplers (90 Words) */
SKP_DWORD_ALIGN const SKP_int16 SKP_Silk_Resampler_3_4_COEFS[ 2 + 3 * RESAMPLER_DOWN_ORDER_FIR / 2 ] = {
-20253, -13986,
86, 7, -151, 368, -542, 232, 11041, 21904,
39, 90, -181, 216, -17, -877, 6408, 19695,
2, 113, -108, 2, 314, -977, 2665, 15787,
};
SKP_DWORD_ALIGN const SKP_int16 SKP_Silk_Resampler_2_3_COEFS[ 2 + 2 * RESAMPLER_DOWN_ORDER_FIR / 2 ] = {
-13997, -14120,
60, -174, 71, 298, -800, 659, 9238, 17461,
48, -40, -150, 314, -155, -845, 4188, 14293,
};
SKP_DWORD_ALIGN const SKP_int16 SKP_Silk_Resampler_1_2_COEFS[ 2 + RESAMPLER_DOWN_ORDER_FIR / 2 ] = {
1233, -14293,
-91, 162, 169, -342, -505, 1332, 5281, 8742,
};
SKP_DWORD_ALIGN const SKP_int16 SKP_Silk_Resampler_3_8_COEFS[ 2 + 3 * RESAMPLER_DOWN_ORDER_FIR / 2 ] = {
12634, -14550,
246, -175, -326, -113, 764, 2209, 3664, 4402,
171, 3, -301, -258, 391, 1693, 3227, 4272,
88, 138, -236, -327, 95, 1203, 2733, 4022,
};
SKP_DWORD_ALIGN const SKP_int16 SKP_Silk_Resampler_1_3_COEFS[ 2 + RESAMPLER_DOWN_ORDER_FIR / 2 ] = {
16306, -14409,
99, -201, -220, -16, 572, 1483, 2433, 3043,
};
SKP_DWORD_ALIGN const SKP_int16 SKP_Silk_Resampler_2_3_COEFS_LQ[ 2 + 2 * 2 ] = {
-2797, -6507,
4697, 10739,
1567, 8276,
};
SKP_DWORD_ALIGN const SKP_int16 SKP_Silk_Resampler_1_3_COEFS_LQ[ 2 + 3 ] = {
16777, -9792,
890, 1614, 2148,
};
/* Tables with coefficients for 4th order ARMA filter (35 Words), in a packed format: */
/* { B1_Q14[1], B2_Q14[1], -A1_Q14[1], -A1_Q14[2], -A2_Q14[1], -A2_Q14[2], gain_Q16 } */
/* where it is assumed that B*_Q14[0], B*_Q14[2], A*_Q14[0] are all 16384 */
SKP_DWORD_ALIGN const SKP_int16 SKP_Silk_Resampler_320_441_ARMA4_COEFS[ 7 ] = {
31454, 24746, -9706, -3386, -17911, -13243, 24797
};
SKP_DWORD_ALIGN const SKP_int16 SKP_Silk_Resampler_240_441_ARMA4_COEFS[ 7 ] = {
28721, 11254, 3189, -2546, -1495, -12618, 11562
};
SKP_DWORD_ALIGN const SKP_int16 SKP_Silk_Resampler_160_441_ARMA4_COEFS[ 7 ] = {
23492, -6457, 14358, -4856, 14654, -13008, 4456
};
SKP_DWORD_ALIGN const SKP_int16 SKP_Silk_Resampler_120_441_ARMA4_COEFS[ 7 ] = {
19311, -15569, 19489, -6950, 21441, -13559, 2370
};
SKP_DWORD_ALIGN const SKP_int16 SKP_Silk_Resampler_80_441_ARMA4_COEFS[ 7 ] = {
13248, -23849, 24126, -9486, 26806, -14286, 1065
};
/* Table with interplation fractions of 1/288 : 2/288 : 287/288 (432 Words) */
SKP_DWORD_ALIGN const SKP_int16 SKP_Silk_resampler_frac_FIR_144[ 144 ][ RESAMPLER_ORDER_FIR_144 / 2 ] = {
{ -25, 58, 32526},
{ -8, -69, 32461},
{ 8, -195, 32393},
{ 25, -318, 32321},
{ 41, -439, 32244},
{ 57, -557, 32163},
{ 72, -673, 32079},
{ 88, -787, 31990},
{ 103, -899, 31897},
{ 118, -1009, 31801},
{ 133, -1116, 31700},
{ 148, -1221, 31596},
{ 162, -1324, 31488},
{ 177, -1424, 31376},
{ 191, -1522, 31260},
{ 205, -1618, 31140},
{ 218, -1712, 31017},
{ 231, -1803, 30890},
{ 245, -1893, 30759},
{ 257, -1980, 30625},
{ 270, -2065, 30487},
{ 282, -2147, 30346},
{ 295, -2228, 30201},
{ 306, -2306, 30052},
{ 318, -2382, 29900},
{ 330, -2456, 29745},
{ 341, -2528, 29586},
{ 352, -2597, 29424},
{ 362, -2664, 29259},
{ 373, -2730, 29090},
{ 383, -2793, 28918},
{ 393, -2854, 28743},
{ 402, -2912, 28565},
{ 411, -2969, 28384},
{ 421, -3024, 28199},
{ 429, -3076, 28012},
{ 438, -3126, 27822},
{ 446, -3175, 27628},
{ 454, -3221, 27432},
{ 462, -3265, 27233},
{ 469, -3307, 27031},
{ 476, -3348, 26826},
{ 483, -3386, 26619},
{ 490, -3422, 26409},
{ 496, -3456, 26196},
{ 502, -3488, 25981},
{ 508, -3518, 25763},
{ 514, -3547, 25543},
{ 519, -3573, 25320},
{ 524, -3597, 25095},
{ 529, -3620, 24867},
{ 533, -3640, 24637},
{ 538, -3659, 24405},
{ 541, -3676, 24171},
{ 545, -3691, 23934},
{ 548, -3704, 23696},
{ 552, -3716, 23455},
{ 554, -3726, 23212},
{ 557, -3733, 22967},
{ 559, -3740, 22721},
{ 561, -3744, 22472},
{ 563, -3747, 22222},
{ 565, -3748, 21970},
{ 566, -3747, 21716},
{ 567, -3745, 21460},
{ 568, -3741, 21203},
{ 568, -3735, 20944},
{ 568, -3728, 20684},
{ 568, -3719, 20422},
{ 568, -3708, 20159},
{ 568, -3697, 19894},
{ 567, -3683, 19628},
{ 566, -3668, 19361},
{ 564, -3652, 19093},
{ 563, -3634, 18823},
{ 561, -3614, 18552},
{ 559, -3594, 18280},
{ 557, -3571, 18008},
{ 554, -3548, 17734},
{ 552, -3523, 17459},
{ 549, -3497, 17183},
{ 546, -3469, 16907},
{ 542, -3440, 16630},
{ 539, -3410, 16352},
{ 535, -3379, 16074},
{ 531, -3346, 15794},
{ 527, -3312, 15515},
{ 522, -3277, 15235},
{ 517, -3241, 14954},
{ 513, -3203, 14673},
{ 507, -3165, 14392},
{ 502, -3125, 14110},
{ 497, -3085, 13828},
{ 491, -3043, 13546},
{ 485, -3000, 13264},
{ 479, -2957, 12982},
{ 473, -2912, 12699},
{ 466, -2867, 12417},
{ 460, -2820, 12135},
{ 453, -2772, 11853},
{ 446, -2724, 11571},
{ 439, -2675, 11289},
{ 432, -2625, 11008},
{ 424, -2574, 10727},
{ 417, -2522, 10446},
{ 409, -2470, 10166},
{ 401, -2417, 9886},
{ 393, -2363, 9607},
{ 385, -2309, 9328},
{ 376, -2253, 9050},
{ 368, -2198, 8773},
{ 359, -2141, 8497},
{ 351, -2084, 8221},
{ 342, -2026, 7946},
{ 333, -1968, 7672},
{ 324, -1910, 7399},
{ 315, -1850, 7127},
{ 305, -1791, 6856},
{ 296, -1731, 6586},
{ 286, -1670, 6317},
{ 277, -1609, 6049},
{ 267, -1548, 5783},
{ 257, -1486, 5517},
{ 247, -1424, 5254},
{ 237, -1362, 4991},
{ 227, -1300, 4730},
{ 217, -1237, 4470},
{ 207, -1174, 4212},
{ 197, -1110, 3956},
{ 187, -1047, 3701},
{ 176, -984, 3448},
{ 166, -920, 3196},
{ 155, -856, 2946},
{ 145, -792, 2698},
{ 134, -728, 2452},
{ 124, -664, 2207},
{ 113, -600, 1965},
{ 102, -536, 1724},
{ 92, -472, 1486},
{ 81, -408, 1249},
{ 70, -345, 1015},
{ 60, -281, 783},
{ 49, -217, 553},
{ 38, -154, 325},
};