/* * Copyright (C) 2015 Jared Boone, ShareBrained Technology, Inc. * * This file is part of PortaPack. * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by * the Free Software Foundation; either version 2, or (at your option) * any later version. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. * * You should have received a copy of the GNU General Public License * along with this program; see the file COPYING. If not, write to * the Free Software Foundation, Inc., 51 Franklin Street, * Boston, MA 02110-1301, USA. */ #ifndef __DSP_FIR_TAPS_H__ #define __DSP_FIR_TAPS_H__ #include #include #include "complex.hpp" template struct fir_taps_real { float pass_frequency_normalized; float stop_frequency_normalized; std::array taps; }; /* 3kHz/6.7kHz @ 96kHz. sum(abs(taps)): 89429 */ constexpr fir_taps_real<64> taps_64_lp_031_070_tfilter { .pass_frequency_normalized = 0.031f, .stop_frequency_normalized = 0.070f, .taps = { { 56, 58, 81, 100, 113, 112, 92, 49, -21, -120, -244, -389, -543, -692, -819, -903, -923, -861, -698, -424, -34, 469, 1073, 1756, 2492, 3243, 3972, 4639, 5204, 5634, 5903, 5995, 5903, 5634, 5204, 4639, 3972, 3243, 2492, 1756, 1073, 469, -34, -424, -698, -861, -923, -903, -819, -692, -543, -389, -244, -120, -21, 49, 92, 112, 113, 100, 81, 58, 56, 0, } }, }; /* 4kHz/7.5kHz @ 96kHz. sum(abs(taps)): 96783 */ constexpr fir_taps_real<64> taps_64_lp_042_078_tfilter { .pass_frequency_normalized = 0.042f, .stop_frequency_normalized = 0.078f, .taps = { { -19, 39, 72, 126, 197, 278, 360, 432, 478, 485, 438, 327, 152, -82, -359, -651, -922, -1132, -1236, -1192, -968, -545, 81, 892, 1852, 2906, 3984, 5012, 5910, 6609, 7053, 7205, 7053, 6609, 5910, 5012, 3984, 2906, 1852, 892, 81, -545, -968, -1192, -1236, -1132, -922, -651, -359, -82, 152, 327, 438, 485, 478, 432, 360, 278, 197, 126, 72, 39, -19, 0, } }, }; /* 5kHz/8.5kHz @ 96kHz. sum(abs(taps)): 101312 */ constexpr fir_taps_real<64> taps_64_lp_052_089_tfilter { .pass_frequency_normalized = 0.052f, .stop_frequency_normalized = 0.089f, .taps = { { -65, -88, -129, -163, -178, -160, -100, 9, 160, 340, 523, 675, 758, 738, 591, 313, -76, -533, -987, -1355, -1544, -1472, -1077, -335, 738, 2078, 3579, 5104, 6502, 7627, 8355, 8608, 8355, 7627, 6502, 5104, 3579, 2078, 738, -335, -1077, -1472, -1544, -1355, -987, -533, -76, 313, 591, 738, 758, 675, 523, 340, 160, 9, -100, -160, -178, -163, -129, -88, -65, 0, } }, }; /* 6kHz/9.6kHz @ 96kHz. sum(abs(taps)): 105088 */ constexpr fir_taps_real<64> taps_64_lp_063_100_tfilter { .pass_frequency_normalized = 0.063f, .stop_frequency_normalized = 0.100f, .taps = { { 43, 21, -2, -54, -138, -245, -360, -453, -493, -451, -309, -73, 227, 535, 776, 876, 773, 443, -86, -730, -1357, -1801, -1898, -1515, -585, 869, 2729, 4794, 6805, 8490, 9611, 10004, 9611, 8490, 6805, 4794, 2729, 869, -585, -1515, -1898, -1801, -1357, -730, -86, 443, 773, 876, 776, 535, 227, -73, -309, -451, -493, -453, -360, -245, -138, -54, -2, 21, 43, 0, } }, }; /* 7kHz/10.4kHz @ 96kHz: sum(abs(taps)): 110157 */ constexpr fir_taps_real<64> taps_64_lp_073_108_tfilter { .pass_frequency_normalized = 0.073f, .stop_frequency_normalized = 0.108f, .taps = { { 79, 145, 241, 334, 396, 394, 306, 130, -109, -360, -550, -611, -494, -197, 229, 677, 1011, 1096, 846, 257, -570, -1436, -2078, -2225, -1670, -327, 1726, 4245, 6861, 9146, 10704, 11257, 10704, 9146, 6861, 4245, 1726, -327, -1670, -2225, -2078, -1436, -570, 257, 846, 1096, 1011, 677, 229, -197, -494, -611, -550, -360, -109, 130, 306, 394, 396, 334, 241, 145, 79, 0, } }, }; /* 8kHz/11.5kHz @ 96kHz. sum(abs(taps)): 112092 */ constexpr fir_taps_real<64> taps_64_lp_083_120_tfilter { .pass_frequency_normalized = 0.083f, .stop_frequency_normalized = 0.120f, .taps = { { -63, -72, -71, -21, 89, 248, 417, 537, 548, 407, 124, -237, -563, -723, -621, -238, 337, 919, 1274, 1201, 617, -382, -1514, -2364, -2499, -1600, 414, 3328, 6651, 9727, 11899, 12682, 11899, 9727, 6651, 3328, 414, -1600, -2499, -2364, -1514, -382, 617, 1201, 1274, 919, 337, -238, -621, -723, -563, -237, 124, 407, 548, 537, 417, 248, 89, -21, -71, -72, -63, 0, } }, }; /* 9kHz/12.4kHz @ 96kHz. sum(abs(taps)): 116249 */ constexpr fir_taps_real<64> taps_64_lp_094_129_tfilter { .pass_frequency_normalized = 0.094f, .stop_frequency_normalized = 0.129f, .taps = { { 5, -93, -198, -335, -449, -478, -378, -144, 166, 444, 563, 440, 82, -395, -788, -892, -589, 73, 859, 1421, 1431, 734, -530, -1919, -2798, -2555, -837, 2274, 6220, 10103, 12941, 13981, 12941, 10103, 6220, 2274, -837, -2555, -2798, -1919, -530, 734, 1431, 1421, 859, 73, -589, -892, -788, -395, 82, 440, 563, 444, 166, -144, -378, -478, -449, -335, -198, -93, 5, 0, } }, }; /* 10kHz/13.4kHz @ 96kHz. sum(abs(taps)): 118511 */ constexpr fir_taps_real<64> taps_64_lp_104_140_tfilter { .pass_frequency_normalized = 0.104f, .stop_frequency_normalized = 0.140f, .taps = { { 89, 159, 220, 208, 84, -147, -412, -597, -588, -345, 58, 441, 595, 391, -128, -730, -1080, -914, -198, 793, 1558, 1594, 678, -942, -2546, -3187, -2084, 992, 5515, 10321, 13985, 15353, 13985, 10321, 5515, 992, -2084, -3187, -2546, -942, 678, 1594, 1558, 793, -198, -914, -1080, -730, -128, 391, 595, 441, 58, -345, -588, -597, -412, -147, 84, 208, 220, 159, 89, 0, } }, }; /* Wideband FM channel filter * 103kHz/128kHz @ 768kHz */ constexpr fir_taps_real<64> taps_64_lp_130_169_tfilter { .pass_frequency_normalized = 0.130f, .stop_frequency_normalized = 0.169f, .taps = { { 100, 127, 62, -157, -470, -707, -678, -332, 165, 494, 400, -85, -610, -729, -253, 535, 1026, 734, -263, -1264, -1398, -332, 1316, 2259, 1447, -988, -3474, -3769, -385, 6230, 13607, 18450, 18450, 13607, 6230, -385, -3769, -3474, -988, 1447, 2259, 1316, -332, -1398, -1264, -263, 734, 1026, 535, -253, -729, -610, -85, 400, 494, 165, -332, -678, -707, -470, -157, 62, 127, 100, } }, }; /* Wideband audio filter */ /* 96kHz int16_t input * -> FIR filter, <15kHz (0.156fs) pass, >19kHz (0.198fs) stop * -> 48kHz int16_t output, gain of 1.0 (I think). * Padded to multiple of four taps for unrolled FIR code. * sum(abs(taps)): 125270 */ constexpr fir_taps_real<64> taps_64_lp_156_198 { .pass_frequency_normalized = 0.156f, .stop_frequency_normalized = 0.196f, .taps = { { -27, 166, 104, -36, -174, -129, 109, 287, 148, -232, -430, -130, 427, 597, 49, -716, -778, 137, 1131, 957, -493, -1740, -1121, 1167, 2733, 1252, -2633, -4899, -1336, 8210, 18660, 23254, 18660, 8210, -1336, -4899, -2633, 1252, 2733, 1167, -1121, -1740, -493, 957, 1131, 137, -778, -716, 49, 597, 427, -130, -430, -232, 148, 287, 109, -129, -174, -36, 104, 166, -27, 0, } }, }; #endif/*__DSP_FIR_TAPS_H__*/