coeff.c
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上传日期：2021-02-19
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文件大小：7k
- /* Coeff.c: filter coefficient file */
- /* */
- /* */
- /* (C) 1997 Texas Instruments */
- /* */
- #include <stdio.h>
- #include "mathhalf.h"
- #include "melp.h"
- /* Lowpass filter coefficient in second-order sections */
- /* Butterworth, 6th order, Cutoff at 1 kHz */
- /* matlab commands: [z,p,k]=butter(6,1000/4000); */
- /* sos=zp2sos(z,p,k); */
- /* Q13 */
- Shortword lpf_num[(LPF_ORD/2)*3] = {
- 713, 1426, 713,
- 798, 1600, 801,
- 1016, 2028, 1012};
- /* sign of coefficients for lpf_den is reversed */
- Shortword lpf_den[(LPF_ORD/2)*3] = {
- -8192, 6884, -1543,
- -8192, 7723, -2731,
- -8192, 9793, -5657};
- /* Butterworth bandpass filters in second-order sections */
- /* matlab scrpt: ~wmlai/dod/fixedpt/bp_sos_fxp.m */
- /* Q13 */
- Shortword bpf_num[NUM_BANDS*((BPF_ORD/2)*3)] = {
- 285, 567, 283, /* lowpass, cutoff at 500 Hz */
- 245, 491, 245,
- 227, 455, 228,
- 5001, -10001, 5001, /* bandpass, pass band at 500-1000 Hz */
- 429, 857, 429,
- 1359, 0, -1359,
- 4470, -8941, 4470, /* bandpass, pass band at 1000-2000 Hz */
- 1624, 3248, 1624,
- 2399, 0, -2399,
- 4470, 8941, 4470, /* bandpass, pass band at 2000-3000 Hz */
- 1624, -3248, 1624,
- 2399, 0, -2399,
- 1020, -2028, 1008, /* highpass, cutoff at 3000 Hz */
- 795, -1599, 805,
- 713, -1426, 713};
- /* sign of coefficients for bpf_den is reversed */
- Shortword bpf_den[NUM_BANDS*((BPF_ORD/2)*3)] = {
- -8192, 13772, -6715, /* lowpass, cutoff at 500 Hz */
- -8192, 11913, -4703,
- -8192, 11051, -3770,
- -8192, 14036, -7108, /* bandpass, pass band at 500-1000 Hz */
- -8192, 10624, -6408,
- -8192, 11585, -5474,
- -8192, 9687, -6002, /* bandpass, pass band at 1000-2000 Hz */
- -8192, 645, -5339,
- -8192, 4799, -3393,
- -8192, -9687, -6002, /* bandpass, pass band at 2000-3000 Hz */
- -8192, -645, -5339,
- -8192, -4799, -3393,
- -8192, -9793, -5657, /* highpass, cutoff at 3000 Hz */
- -8192, -7723, -2731,
- -8192, -6883, -1543};
- /* Hamming window coefficents in Q15 */
- Shortword win_cof[LPC_FRAME] = {
- 2621,
- 2628,
- 2651,
- 2689,
- 2741,
- 2808,
- 2891,
- 2988,
- 3099,
- 3225,
- 3366,
- 3521,
- 3690,
- 3873,
- 4070,
- 4280,
- 4504,
- 4741,
- 4990,
- 5253,
- 5528,
- 5815,
- 6113,
- 6424,
- 6745,
- 7078,
- 7421,
- 7774,
- 8138,
- 8510,
- 8892,
- 9283,
- 9682,
- 10089,
- 10504,
- 10925,
- 11354,
- 11789,
- 12230,
- 12676,
- 13127,
- 13583,
- 14043,
- 14506,
- 14973,
- 15442,
- 15914,
- 16387,
- 16862,
- 17337,
- 17813,
- 18289,
- 18764,
- 19238,
- 19711,
- 20181,
- 20649,
- 21115,
- 21576,
- 22034,
- 22488,
- 22936,
- 23380,
- 23818,
- 24250,
- 24675,
- 25093,
- 25504,
- 25907,
- 26302,
- 26688,
- 27066,
- 27434,
- 27792,
- 28140,
- 28478,
- 28805,
- 29121,
- 29426,
- 29719,
- 30000,
- 30268,
- 30524,
- 30768,
- 30998,
- 31215,
- 31419,
- 31609,
- 31785,
- 31947,
- 32094,
- 32228,
- 32347,
- 32451,
- 32541,
- 32616,
- 32676,
- 32721,
- 32751,
- 32766,
- 32766,
- 32751,
- 32721,
- 32676,
- 32616,
- 32541,
- 32451,
- 32347,
- 32228,
- 32094,
- 31947,
- 31785,
- 31609,
- 31419,
- 31215,
- 30998,
- 30768,
- 30524,
- 30268,
- 30000,
- 29719,
- 29426,
- 29121,
- 28805,
- 28478,
- 28140,
- 27792,
- 27434,
- 27066,
- 26688,
- 26302,
- 25907,
- 25504,
- 25093,
- 24675,
- 24250,
- 23818,
- 23380,
- 22936,
- 22488,
- 22034,
- 21576,
- 21115,
- 20649,
- 20181,
- 19711,
- 19238,
- 18764,
- 18289,
- 17813,
- 17337,
- 16862,
- 16387,
- 15914,
- 15442,
- 14973,
- 14506,
- 14043,
- 13583,
- 13127,
- 12676,
- 12230,
- 11789,
- 11354,
- 10925,
- 10504,
- 10089,
- 9682,
- 9283,
- 8892,
- 8510,
- 8138,
- 7774,
- 7421,
- 7078,
- 6745,
- 6424,
- 6113,
- 5815,
- 5528,
- 5253,
- 4990,
- 4741,
- 4504,
- 4280,
- 4070,
- 3873,
- 3690,
- 3521,
- 3366,
- 3225,
- 3099,
- 2988,
- 2891,
- 2808,
- 2741,
- 2689,
- 2651,
- 2628,
- 2621};
- /* Bandpass filter coeffients */
- Shortword bp_cof[NUM_BANDS][MIX_ORD+1] = {
- {
- 0, /* lowpass, cutoff at 500 Hz */
- -50,
- -115,
- -185,
- -245,
- -274,
- -253,
- -165,
- 0,
- 242,
- 548,
- 897,
- 1257,
- 1590,
- 1860,
- 2036,
- 2097,
- 2036,
- 1860,
- 1590,
- 1257,
- 897,
- 548,
- 242,
- 0,
- -165,
- -253,
- -274,
- -245,
- -185,
- -115,
- -50,
- 0
- },
- {
- 0, /* bandpass, pass band at 500-1000 Hz */
- -41,
- -46,
- 42,
- 238,
- 470,
- 593,
- 456,
- 0,
- -668,
- -1286,
- -1539,
- -1221,
- -362,
- 748,
- 1677,
- 2037,
- 1677,
- 748,
- -362,
- -1221,
- -1539,
- -1286,
- -668,
- 0,
- 456,
- 593,
- 470,
- 238,
- 42,
- -46,
- -41,
- 0
- },
- {
- 0, /* bandpass, pass band at 1000-2000 Hz */
- -38,
- 162,
- 342,
- 0,
- -506,
- -357,
- 126,
- 0,
- -185,
- 774,
- 1656,
- 0,
- -2933,
- -2627,
- 1556,
- 4188,
- 1556,
- -2627,
- -2933,
- 0,
- 1656,
- 774,
- -185,
- 0,
- 126,
- -357,
- -506,
- 0,
- 342,
- 162,
- -38,
- 0
- },
- {
- 0, /* bandpass, pass band at 2000-3000 Hz */
- 38,
- 162,
- -342,
- 0,
- 506,
- -357,
- -126,
- 0,
- 185,
- 774,
- -1656,
- 0,
- 2933,
- -2627,
- -1556,
- 4188,
- -1556,
- -2627,
- 2933,
- 0,
- -1656,
- 774,
- 185,
- 0,
- -126,
- -357,
- 506,
- 0,
- -342,
- 162,
- 38,
- 0
- },
- {
- 0, /* highpass, cutoff at 3000 Hz */
- 91,
- -161,
- 140,
- 0,
- -208,
- 354,
- -302,
- 0,
- 442,
- -768,
- 680,
- 0,
- -1205,
- 2604,
- -3725,
- 4153,
- -3725,
- 2604,
- -1205,
- 0,
- 680,
- -768,
- 442,
- 0,
- -302,
- 354,
- -208,
- 0,
- 140,
- -161,
- 91,
- 0}};
- /* Triangle pulse dispersion filter */
- Shortword disp_cof[DISP_ORD+1] = {
- -5670,
- -461,
- 401,
- 3724,
- 65,
- 0,
- 1484,
- -30,
- -34,
- 836,
- -2077,
- -40,
- 463,
- 7971,
- -579,
- -6,
- 1923,
- -107,
- 199,
- 902,
- -1098,
- 197,
- 471,
- 27150,
- 11,
- -118,
- 2406,
- -170,
- 425,
- 960,
- -652,
- 399,
- 387,
- -12755,
- 236,
- -378,
- 2761,
- -117,
- 705,
- 973,
- -409,
- 608,
- 25,
- -2539,
- 408,
- -892,
- 2381,
- 155,
- 1156,
- 876,
- -244,
- 846,
- 6,
- -926,
- 564,
- -1967,
- -2319,
- 300,
- 1993,
- 592,
- -104,
- 1129,
- 9,
- -345,
- 710};
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