mirror of
https://github.com/portapack-mayhem/mayhem-firmware.git
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71990b380a
Created fir_taps_real<N> structure, with pass and stop normalized frequencies. Removed unused filter taps.
206 lines
8.4 KiB
C++
206 lines
8.4 KiB
C++
/*
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* Copyright (C) 2015 Jared Boone, ShareBrained Technology, Inc.
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*
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* This file is part of PortaPack.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2, or (at your option)
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* any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; see the file COPYING. If not, write to
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* the Free Software Foundation, Inc., 51 Franklin Street,
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* Boston, MA 02110-1301, USA.
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*/
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#ifndef __DSP_FIR_TAPS_H__
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#define __DSP_FIR_TAPS_H__
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#include <cstdint>
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#include <array>
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#include "complex.hpp"
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template<size_t N>
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struct fir_taps_real {
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float pass_frequency_normalized;
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float stop_frequency_normalized;
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std::array<int16_t, N> taps;
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};
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/* 3kHz/6.7kHz @ 96kHz. sum(abs(taps)): 89429 */
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constexpr fir_taps_real<64> taps_64_lp_031_070_tfilter {
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.pass_frequency_normalized = 0.031f,
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.stop_frequency_normalized = 0.070f,
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.taps = { {
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56, 58, 81, 100, 113, 112, 92, 49,
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-21, -120, -244, -389, -543, -692, -819, -903,
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-923, -861, -698, -424, -34, 469, 1073, 1756,
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2492, 3243, 3972, 4639, 5204, 5634, 5903, 5995,
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5903, 5634, 5204, 4639, 3972, 3243, 2492, 1756,
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1073, 469, -34, -424, -698, -861, -923, -903,
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-819, -692, -543, -389, -244, -120, -21, 49,
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92, 112, 113, 100, 81, 58, 56, 0,
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} },
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};
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/* 4kHz/7.5kHz @ 96kHz. sum(abs(taps)): 96783 */
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constexpr fir_taps_real<64> taps_64_lp_042_078_tfilter {
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.pass_frequency_normalized = 0.042f,
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.stop_frequency_normalized = 0.078f,
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.taps = { {
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-19, 39, 72, 126, 197, 278, 360, 432,
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478, 485, 438, 327, 152, -82, -359, -651,
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-922, -1132, -1236, -1192, -968, -545, 81, 892,
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1852, 2906, 3984, 5012, 5910, 6609, 7053, 7205,
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7053, 6609, 5910, 5012, 3984, 2906, 1852, 892,
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81, -545, -968, -1192, -1236, -1132, -922, -651,
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-359, -82, 152, 327, 438, 485, 478, 432,
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360, 278, 197, 126, 72, 39, -19, 0,
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} },
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};
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/* 5kHz/8.5kHz @ 96kHz. sum(abs(taps)): 101312 */
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constexpr fir_taps_real<64> taps_64_lp_052_089_tfilter {
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.pass_frequency_normalized = 0.052f,
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.stop_frequency_normalized = 0.089f,
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.taps = { {
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-65, -88, -129, -163, -178, -160, -100, 9,
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160, 340, 523, 675, 758, 738, 591, 313,
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-76, -533, -987, -1355, -1544, -1472, -1077, -335,
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738, 2078, 3579, 5104, 6502, 7627, 8355, 8608,
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8355, 7627, 6502, 5104, 3579, 2078, 738, -335,
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-1077, -1472, -1544, -1355, -987, -533, -76, 313,
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591, 738, 758, 675, 523, 340, 160, 9,
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-100, -160, -178, -163, -129, -88, -65, 0,
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} },
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};
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/* 6kHz/9.6kHz @ 96kHz. sum(abs(taps)): 105088 */
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constexpr fir_taps_real<64> taps_64_lp_063_100_tfilter {
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.pass_frequency_normalized = 0.063f,
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.stop_frequency_normalized = 0.100f,
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.taps = { {
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43, 21, -2, -54, -138, -245, -360, -453,
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-493, -451, -309, -73, 227, 535, 776, 876,
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773, 443, -86, -730, -1357, -1801, -1898, -1515,
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-585, 869, 2729, 4794, 6805, 8490, 9611, 10004,
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9611, 8490, 6805, 4794, 2729, 869, -585, -1515,
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-1898, -1801, -1357, -730, -86, 443, 773, 876,
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776, 535, 227, -73, -309, -451, -493, -453,
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-360, -245, -138, -54, -2, 21, 43, 0,
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} },
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};
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/* 7kHz/10.4kHz @ 96kHz: sum(abs(taps)): 110157 */
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constexpr fir_taps_real<64> taps_64_lp_073_108_tfilter {
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.pass_frequency_normalized = 0.073f,
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.stop_frequency_normalized = 0.108f,
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.taps = { {
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79, 145, 241, 334, 396, 394, 306, 130,
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-109, -360, -550, -611, -494, -197, 229, 677,
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1011, 1096, 846, 257, -570, -1436, -2078, -2225,
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-1670, -327, 1726, 4245, 6861, 9146, 10704, 11257,
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10704, 9146, 6861, 4245, 1726, -327, -1670, -2225,
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-2078, -1436, -570, 257, 846, 1096, 1011, 677,
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229, -197, -494, -611, -550, -360, -109, 130,
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306, 394, 396, 334, 241, 145, 79, 0,
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} },
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};
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/* 8kHz/11.5kHz @ 96kHz. sum(abs(taps)): 112092 */
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constexpr fir_taps_real<64> taps_64_lp_083_120_tfilter {
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.pass_frequency_normalized = 0.083f,
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.stop_frequency_normalized = 0.120f,
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.taps = { {
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-63, -72, -71, -21, 89, 248, 417, 537,
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548, 407, 124, -237, -563, -723, -621, -238,
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337, 919, 1274, 1201, 617, -382, -1514, -2364,
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-2499, -1600, 414, 3328, 6651, 9727, 11899, 12682,
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11899, 9727, 6651, 3328, 414, -1600, -2499, -2364,
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-1514, -382, 617, 1201, 1274, 919, 337, -238,
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-621, -723, -563, -237, 124, 407, 548, 537,
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417, 248, 89, -21, -71, -72, -63, 0,
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} },
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};
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/* 9kHz/12.4kHz @ 96kHz. sum(abs(taps)): 116249 */
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constexpr fir_taps_real<64> taps_64_lp_094_129_tfilter {
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.pass_frequency_normalized = 0.094f,
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.stop_frequency_normalized = 0.129f,
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.taps = { {
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5, -93, -198, -335, -449, -478, -378, -144,
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166, 444, 563, 440, 82, -395, -788, -892,
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-589, 73, 859, 1421, 1431, 734, -530, -1919,
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-2798, -2555, -837, 2274, 6220, 10103, 12941, 13981,
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12941, 10103, 6220, 2274, -837, -2555, -2798, -1919,
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-530, 734, 1431, 1421, 859, 73, -589, -892,
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-788, -395, 82, 440, 563, 444, 166, -144,
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-378, -478, -449, -335, -198, -93, 5, 0,
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} },
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};
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/* 10kHz/13.4kHz @ 96kHz. sum(abs(taps)): 118511 */
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constexpr fir_taps_real<64> taps_64_lp_104_140_tfilter {
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.pass_frequency_normalized = 0.104f,
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.stop_frequency_normalized = 0.140f,
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.taps = { {
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89, 159, 220, 208, 84, -147, -412, -597,
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-588, -345, 58, 441, 595, 391, -128, -730,
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-1080, -914, -198, 793, 1558, 1594, 678, -942,
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-2546, -3187, -2084, 992, 5515, 10321, 13985, 15353,
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13985, 10321, 5515, 992, -2084, -3187, -2546, -942,
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678, 1594, 1558, 793, -198, -914, -1080, -730,
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-128, 391, 595, 441, 58, -345, -588, -597,
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-412, -147, 84, 208, 220, 159, 89, 0,
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} },
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};
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/* Wideband FM channel filter
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* 103kHz/128kHz @ 768kHz
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*/
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constexpr fir_taps_real<64> taps_64_lp_130_169_tfilter {
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.pass_frequency_normalized = 0.130f,
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.stop_frequency_normalized = 0.169f,
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.taps = { {
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100, 127, 62, -157, -470, -707, -678, -332,
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165, 494, 400, -85, -610, -729, -253, 535,
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1026, 734, -263, -1264, -1398, -332, 1316, 2259,
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1447, -988, -3474, -3769, -385, 6230, 13607, 18450,
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18450, 13607, 6230, -385, -3769, -3474, -988, 1447,
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2259, 1316, -332, -1398, -1264, -263, 734, 1026,
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535, -253, -729, -610, -85, 400, 494, 165,
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-332, -678, -707, -470, -157, 62, 127, 100,
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} },
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};
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/* Wideband audio filter */
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/* 96kHz int16_t input
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* -> FIR filter, <15kHz (0.156fs) pass, >19kHz (0.198fs) stop
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* -> 48kHz int16_t output, gain of 1.0 (I think).
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* Padded to multiple of four taps for unrolled FIR code.
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* sum(abs(taps)): 125270
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*/
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constexpr fir_taps_real<64> taps_64_lp_156_198 {
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.pass_frequency_normalized = 0.156f,
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.stop_frequency_normalized = 0.196f,
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.taps = { {
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-27, 166, 104, -36, -174, -129, 109, 287,
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148, -232, -430, -130, 427, 597, 49, -716,
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-778, 137, 1131, 957, -493, -1740, -1121, 1167,
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2733, 1252, -2633, -4899, -1336, 8210, 18660, 23254,
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18660, 8210, -1336, -4899, -2633, 1252, 2733, 1167,
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-1121, -1740, -493, 957, 1131, 137, -778, -716,
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49, 597, 427, -130, -430, -232, 148, 287,
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109, -129, -174, -36, 104, 166, -27, 0,
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} },
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};
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#endif/*__DSP_FIR_TAPS_H__*/
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