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https://github.com/portapack-mayhem/mayhem-firmware.git
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c179b9e1cd
Planning to pass from M0 to M4 so M4 doesn't need to keep all these different filter configs in text section.
231 lines
9.0 KiB
C++
231 lines
9.0 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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// NBFM 16K0F3E emission type /////////////////////////////////////////////
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// IFIR image-reject filter: fs=3072000, pass=8000, stop=344000, decim=8, fout=384000
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constexpr fir_taps_real<24> taps_16k0_decim_0 {
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.pass_frequency_normalized = 8000.0f / 3072000.0f,
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.stop_frequency_normalized = 344000.0f / 3072000.0f,
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.taps = { {
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1, 67, 165, 340, 599, 944, 1361, 1820,
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2278, 2684, 2988, 3152, 3152, 2988, 2684, 2278,
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1820, 1361, 944, 599, 340, 165, 67, 1,
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} },
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};
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// IFIR prototype filter: fs=384000, pass=8000, stop=40000, decim=8, fout=48000
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constexpr fir_taps_real<32> taps_16k0_decim_1 {
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.pass_frequency_normalized = 8000.0f / 384000.0f,
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.stop_frequency_normalized = 40000.0f / 384000.0f,
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.taps = { {
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-26, -125, -180, -275, -342, -359, -286, -90,
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250, 733, 1337, 2011, 2688, 3289, 3740, 3982,
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3982, 3740, 3289, 2688, 2011, 1337, 733, 250,
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-90, -286, -359, -342, -275, -180, -125, -26,
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} },
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};
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// Channel filter: fs=48000, pass=8000, stop=12400, decim=1, fout=48000
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constexpr fir_taps_real<32> taps_16k0_channel {
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.pass_frequency_normalized = 8000.0f / 48000.0f,
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.stop_frequency_normalized = 12400.0f / 48000.0f,
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.taps = { {
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-73, -285, -376, -8, 609, 538, -584, -1387,
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-148, 2173, 1959, -2146, -5267, -297, 12915, 24737,
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24737, 12915, -297, -5267, -2146, 1959, 2173, -148,
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-1387, -584, 538, 609, -8, -376, -285, -73,
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} },
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};
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// NBFM 11K0F3E emission type /////////////////////////////////////////////
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// IFIR image-reject filter: fs=3072000, pass=5500, stop=341500, decim=8, fout=384000
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constexpr fir_taps_real<24> taps_11k0_decim_0 {
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.pass_frequency_normalized = 5500.0f / 3072000.0f,
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.stop_frequency_normalized = 341500.0f / 3072000.0f,
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.taps = { {
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38, 102, 220, 406, 668, 1004, 1397, 1822,
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2238, 2603, 2875, 3020, 3020, 2875, 2603, 2238,
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1822, 1397, 1004, 668, 406, 220, 102, 38,
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} },
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};
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// IFIR prototype filter: fs=384000, pass=5500, stop=42500, decim=8, fout=48000
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constexpr fir_taps_real<32> taps_11k0_decim_1 {
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.pass_frequency_normalized = 5500.0f / 384000.0f,
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.stop_frequency_normalized = 42500.0f / 384000.0f,
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.taps = { {
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-42, -87, -157, -234, -298, -318, -255, -75,
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246, 713, 1306, 1976, 2656, 3265, 3724, 3971,
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3971, 3724, 3265, 2656, 1976, 1306, 713, 246,
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-75, -255, -318, -298, -234, -157, -87, -42,
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} },
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};
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// Channel filter: fs=48000, pass=5500, stop=8900, decim=1, fout=48000
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constexpr fir_taps_real<32> taps_11k0_channel {
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.pass_frequency_normalized = 5500.0f / 48000.0f,
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.stop_frequency_normalized = 8900.0f / 48000.0f,
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.taps = { {
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-68, -345, -675, -867, -582, 247, 1222, 1562,
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634, -1379, -3219, -3068, 310, 6510, 13331, 17795,
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17795, 13331, 6510, 310, -3068, -3219, -1379, 634,
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1562, 1222, 247, -582, -867, -675, -345, -68,
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} },
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};
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/// NBFM 8K50F3E emission type ////////////////////////////////////////////
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// IFIR image-reject filter: fs=3072000, pass=4250, stop=340250, decim=8, fout=384000
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constexpr fir_taps_real<24> taps_4k25_decim_0 {
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.pass_frequency_normalized = 4250.0f / 3072000.0f,
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.stop_frequency_normalized = 340250.0f / 3072000.0f,
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.taps = { {
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38, 103, 222, 409, 671, 1006, 1399, 1821,
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2236, 2599, 2868, 3012, 3012, 2868, 2599, 2236,
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1821, 1399, 1006, 671, 409, 222, 103, 38,
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} },
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};
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// IFIR prototype filter: fs=384000, pass=4250, stop=43750, decim=8, fout=48000
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constexpr fir_taps_real<32> taps_4k25_decim_1 {
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.pass_frequency_normalized = 4250.0f / 384000.0f,
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.stop_frequency_normalized = 43750.0f / 384000.0f,
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.taps = { {
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-33, -74, -139, -214, -280, -306, -254, -87,
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222, 682, 1274, 1951, 2644, 3268, 3741, 3996,
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3996, 3741, 3268, 2644, 1951, 1274, 682, 222,
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-87, -254, -306, -280, -214, -139, -74, -33,
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} },
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};
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// Channel filter: fs=48000, pass=4250, stop=7900, decim=1, fout=48000
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constexpr fir_taps_real<32> taps_4k25_channel {
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.pass_frequency_normalized = 4250.0f / 48000.0f,
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.stop_frequency_normalized = 7900.0f / 48000.0f,
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.taps = { {
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-58, -14, 153, 484, 871, 1063, 770, -141,
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-1440, -2488, -2435, -614, 3035, 7771, 12226, 14927,
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14927, 12226, 7771, 3035, -614, -2435, -2488, -1440,
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-141, 770, 1063, 871, 484, 153, -14, -58,
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} },
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};
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// DSB AM 6K00A3E emission type ///////////////////////////////////////////
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// IFIR image-reject filter: fs=3072000, pass=3000, stop=339000, decim=8, fout=384000
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constexpr fir_taps_real<24> taps_6k0_decim_0 {
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.pass_frequency_normalized = 3000.0f / 3072000.0f,
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.stop_frequency_normalized = 339000.0f / 3072000.0f,
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.taps = { {
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39, 104, 224, 412, 674, 1008, 1400, 1821,
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2234, 2594, 2863, 3006, 3006, 2863, 2594, 2234,
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1821, 1400, 1008, 674, 412, 224, 104, 39,
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} },
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};
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// IFIR prototype filter: fs=384000, pass=3000, stop=45000, decim=8, fout=48000
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constexpr fir_taps_real<32> taps_6k0_decim_1 {
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.pass_frequency_normalized = 3000.0f / 384000.0f,
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.stop_frequency_normalized = 45000.0f / 384000.0f,
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.taps = { {
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-26, -63, -123, -195, -263, -295, -253, -99,
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199, 651, 1242, 1927, 2633, 3273, 3760, 4023,
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4023, 3760, 3273, 2633, 1927, 1242, 651, 199,
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-99, -253, -295, -263, -195, -123, -63, -26,
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} },
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};
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// Channel filter: fs=48000, pass=3000, stop=6700, decim=1, fout=48000
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constexpr fir_taps_real<32> taps_6k0_channel {
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.pass_frequency_normalized = 3000.0f / 48000.0f,
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.stop_frequency_normalized = 6700.0f / 48000.0f,
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.taps = { {
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95, 178, 247, 208, -21, -474, -1080, -1640,
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-1857, -1411, -83, 2134, 4978, 7946, 10413, 11815,
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11815, 10413, 7946, 4978, 2134, -83, -1411, -1857,
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-1640, -1080, -474, -21, 208, 247, 178, 95,
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} },
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};
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// WFM 200KF8E emission type //////////////////////////////////////////////
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// IFIR image-reject filter: fs=3072000, pass=100000, stop=484000, decim=4, fout=768000
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constexpr fir_taps_real<24> taps_200k_wfm_decim_0 = {
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.pass_frequency_normalized = 100000.0f / 3072000.0f,
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.stop_frequency_normalized = 484000.0f / 3072000.0f,
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.taps = { {
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48, -18, -151, -364, -557, -548, -139, 789,
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2187, 3800, 5230, 6071, 6071, 5230, 3800, 2187,
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789, -139, -548, -557, -364, -151, -18, 48,
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} },
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};
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// IFIR prototype filter: fs=768000, pass=100000, stop=284000, decim=2, fout=384000
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constexpr fir_taps_real<16> taps_200k_wfm_decim_1 = {
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.pass_frequency_normalized = 100000.0f / 768000.0f,
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.stop_frequency_normalized = 284000.0f / 768000.0f,
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.taps = { {
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-67, -123, 388, 622, -1342, -2185, 4599, 14486,
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14486, 4599, -2185, -1342, 622, 388, -123, -67,
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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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