freeswitch/libs/silk/src/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: 550 Words (1.1 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, 0.12, 1];  A = [1, 0.055, 0.8]; G = 0.87; 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 ] = { 7864,  -3604,  13107,  28508 };


/* Tables with IIR and FIR coefficients for fractional downsamplers (70 Words) */
SKP_DWORD_ALIGN const SKP_int16 SKP_Silk_Resampler_3_4_COEFS[ 2 + 3 * RESAMPLER_DOWN_ORDER_FIR / 2 ] = {
	-18249, -12532,
	   -97,    284,   -495,    309,  10268,  20317,
	   -94,    156,    -48,   -720,   5984,  18278,
	   -45,     -4,    237,   -847,   2540,  14662,
};

SKP_DWORD_ALIGN const SKP_int16 SKP_Silk_Resampler_2_3_COEFS[ 2 + 2 * RESAMPLER_DOWN_ORDER_FIR / 2 ] = {
	-11891, -12486,
	    20,    211,   -657,    688,   8423,  15911,
	   -44,    197,   -152,   -653,   3855,  13015,
};

SKP_DWORD_ALIGN const SKP_int16 SKP_Silk_Resampler_1_2_COEFS[ 2 + RESAMPLER_DOWN_ORDER_FIR / 2 ] = {
	  2415, -13101,
	   158,   -295,   -400,   1265,   4832,   7968,
};

SKP_DWORD_ALIGN const SKP_int16 SKP_Silk_Resampler_3_8_COEFS[ 2 + 3 * RESAMPLER_DOWN_ORDER_FIR / 2 ] = {
	 13270, -13738,
	  -294,   -123,    747,   2043,   3339,   3995,
	  -151,   -311,    414,   1583,   2947,   3877,
	   -33,   -389,    143,   1141,   2503,   3653,
};

SKP_DWORD_ALIGN const SKP_int16 SKP_Silk_Resampler_1_3_COEFS[ 2 + RESAMPLER_DOWN_ORDER_FIR / 2 ] = {
	 16643, -14000,
	  -331,     19,    581,   1421,   2290,   2845,
};

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 ] = {
	{ -647,  1884, 30078},
	{ -625,  1736, 30044},
	{ -603,  1591, 30005},
	{ -581,  1448, 29963},
	{ -559,  1308, 29917},
	{ -537,  1169, 29867},
	{ -515,  1032, 29813},
	{ -494,   898, 29755},
	{ -473,   766, 29693},
	{ -452,   636, 29627},
	{ -431,   508, 29558},
	{ -410,   383, 29484},
	{ -390,   260, 29407},
	{ -369,   139, 29327},
	{ -349,    20, 29242},
	{ -330,   -97, 29154},
	{ -310,  -211, 29062},
	{ -291,  -324, 28967},
	{ -271,  -434, 28868},
	{ -253,  -542, 28765},
	{ -234,  -647, 28659},
	{ -215,  -751, 28550},
	{ -197,  -852, 28436},
	{ -179,  -951, 28320},
	{ -162, -1048, 28200},
	{ -144, -1143, 28077},
	{ -127, -1235, 27950},
	{ -110, -1326, 27820},
	{  -94, -1414, 27687},
	{  -77, -1500, 27550},
	{  -61, -1584, 27410},
	{  -45, -1665, 27268},
	{  -30, -1745, 27122},
	{  -15, -1822, 26972},
	{    0, -1897, 26820},
	{   15, -1970, 26665},
	{   29, -2041, 26507},
	{   44, -2110, 26346},
	{   57, -2177, 26182},
	{   71, -2242, 26015},
	{   84, -2305, 25845},
	{   97, -2365, 25673},
	{  110, -2424, 25498},
	{  122, -2480, 25320},
	{  134, -2534, 25140},
	{  146, -2587, 24956},
	{  157, -2637, 24771},
	{  168, -2685, 24583},
	{  179, -2732, 24392},
	{  190, -2776, 24199},
	{  200, -2819, 24003},
	{  210, -2859, 23805},
	{  220, -2898, 23605},
	{  229, -2934, 23403},
	{  238, -2969, 23198},
	{  247, -3002, 22992},
	{  255, -3033, 22783},
	{  263, -3062, 22572},
	{  271, -3089, 22359},
	{  279, -3114, 22144},
	{  286, -3138, 21927},
	{  293, -3160, 21709},
	{  300, -3180, 21488},
	{  306, -3198, 21266},
	{  312, -3215, 21042},
	{  318, -3229, 20816},
	{  323, -3242, 20589},
	{  328, -3254, 20360},
	{  333, -3263, 20130},
	{  338, -3272, 19898},
	{  342, -3278, 19665},
	{  346, -3283, 19430},
	{  350, -3286, 19194},
	{  353, -3288, 18957},
	{  356, -3288, 18718},
	{  359, -3286, 18478},
	{  362, -3283, 18238},
	{  364, -3279, 17996},
	{  366, -3273, 17753},
	{  368, -3266, 17509},
	{  369, -3257, 17264},
	{  371, -3247, 17018},
	{  372, -3235, 16772},
	{  372, -3222, 16525},
	{  373, -3208, 16277},
	{  373, -3192, 16028},
	{  373, -3175, 15779},
	{  373, -3157, 15529},
	{  372, -3138, 15279},
	{  371, -3117, 15028},
	{  370, -3095, 14777},
	{  369, -3072, 14526},
	{  368, -3048, 14274},
	{  366, -3022, 14022},
	{  364, -2996, 13770},
	{  362, -2968, 13517},
	{  359, -2940, 13265},
	{  357, -2910, 13012},
	{  354, -2880, 12760},
	{  351, -2848, 12508},
	{  348, -2815, 12255},
	{  344, -2782, 12003},
	{  341, -2747, 11751},
	{  337, -2712, 11500},
	{  333, -2676, 11248},
	{  328, -2639, 10997},
	{  324, -2601, 10747},
	{  320, -2562, 10497},
	{  315, -2523, 10247},
	{  310, -2482,  9998},
	{  305, -2442,  9750},
	{  300, -2400,  9502},
	{  294, -2358,  9255},
	{  289, -2315,  9009},
	{  283, -2271,  8763},
	{  277, -2227,  8519},
	{  271, -2182,  8275},
	{  265, -2137,  8032},
	{  259, -2091,  7791},
	{  252, -2045,  7550},
	{  246, -1998,  7311},
	{  239, -1951,  7072},
	{  232, -1904,  6835},
	{  226, -1856,  6599},
	{  219, -1807,  6364},
	{  212, -1758,  6131},
	{  204, -1709,  5899},
	{  197, -1660,  5668},
	{  190, -1611,  5439},
	{  183, -1561,  5212},
	{  175, -1511,  4986},
	{  168, -1460,  4761},
	{  160, -1410,  4538},
	{  152, -1359,  4317},
	{  145, -1309,  4098},
	{  137, -1258,  3880},
	{  129, -1207,  3664},
	{  121, -1156,  3450},
	{  113, -1105,  3238},
	{  105, -1054,  3028},
	{   97, -1003,  2820},
	{   89,  -952,  2614},
	{   81,  -901,  2409},
	{   73,  -851,  2207},
};