97 lines
5.0 KiB
C++
97 lines
5.0 KiB
C++
/***************************************************************************
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* Copyright (C) 2021 - 2022 by Federico Amedeo Izzo IU2NUO, *
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* Niccolò Izzo IU2KIN *
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* Wojciech Kaczmarski SP5WWP *
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* Frederik Saraci IU2NRO *
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* Silvano Seva IU2KWO *
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* *
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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 3 of the License, or *
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* (at your option) 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; if not, see <http://www.gnu.org/licenses/> *
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***************************************************************************/
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#ifndef M17_DSP_H
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#define M17_DSP_H
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#ifndef __cplusplus
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#error This header is C++ only!
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#endif
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#include <fir.hpp>
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#include <array>
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namespace M17
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{
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/*
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* Coefficients for M17 RRC filters
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*/
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static constexpr std::array<float, 81> rrc_taps_48k =
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{
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-0.003195702904062073, -0.002930279157647190, -0.001940667871554463,
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-0.000356087678023658, 0.001547011339077758, 0.003389554791179751,
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0.004761898604225673, 0.005310860846138910, 0.004824746306020221,
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0.003297923526848786, 0.000958710871218619, -0.001749908029791816,
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-0.004238694106631223, -0.005881783042101693, -0.006150256456781309,
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-0.004745376707651645, -0.001704189656473565, 0.002547854551539951,
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0.007215575568844704, 0.011231038205363532, 0.013421952197060707,
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0.012730475385624438, 0.008449554307303753, 0.000436744366018287,
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-0.010735380379191660, -0.023726883538258272, -0.036498030780605324,
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-0.046500883189991064, -0.050979050575999614, -0.047340680079891187,
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-0.033554880492651755, -0.008513823955725943, 0.027696543159614194,
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0.073664520037517042, 0.126689053778116234, 0.182990955139333916,
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0.238080025892859704, 0.287235637987091563, 0.326040247765297220,
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0.350895727088112619, 0.359452932027607974, 0.350895727088112619,
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0.326040247765297220, 0.287235637987091563, 0.238080025892859704,
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0.182990955139333916, 0.126689053778116234, 0.073664520037517042,
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0.027696543159614194, -0.008513823955725943, -0.033554880492651755,
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-0.047340680079891187, -0.050979050575999614, -0.046500883189991064,
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-0.036498030780605324, -0.023726883538258272, -0.010735380379191660,
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0.000436744366018287, 0.008449554307303753, 0.012730475385624438,
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0.013421952197060707, 0.011231038205363532, 0.007215575568844704,
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0.002547854551539951, -0.001704189656473565, -0.004745376707651645,
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-0.006150256456781309, -0.005881783042101693, -0.004238694106631223,
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-0.001749908029791816, 0.000958710871218619, 0.003297923526848786,
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0.004824746306020221, 0.005310860846138910, 0.004761898604225673,
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0.003389554791179751, 0.001547011339077758, -0.000356087678023658,
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-0.001940667871554463, -0.002930279157647190, -0.003195702904062073,
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};
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static constexpr std::array<float, 41> rrc_taps_24k =
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{
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-0.002021130037130002, -0.001227380092907312, 0.000978411066065117,
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0.003011674298801149, 0.003051422479929027, 0.000606339011138998,
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-0.002680772347838965, -0.003889744583281823, -0.001077818873364855,
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0.004563508234396922, 0.008488746155946006, 0.005343941074480147,
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-0.006789617306671533, -0.023083267913613266, -0.032241823935683658,
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-0.021221865389865011, 0.017516745763008643, 0.080124798723015214,
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0.150574288667793071, 0.206204943905808818, 0.227336876945597260,
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0.206204943905808818, 0.150574288667793071, 0.080124798723015214,
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0.017516745763008643, -0.021221865389865011, -0.032241823935683658,
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-0.023083267913613266, -0.006789617306671533, 0.005343941074480147,
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0.008488746155946006, 0.004563508234396922, -0.001077818873364855,
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-0.003889744583281823, -0.002680772347838965, 0.000606339011138998,
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0.003051422479929027, 0.003011674298801149, 0.000978411066065117,
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-0.001227380092907312, -0.002021130037130002,
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};
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/*
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* FIR implementations of the RRC filter for baseband audio generation.
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*/
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extern Fir< std::tuple_size< decltype(rrc_taps_48k) >::value > rrc_48k;
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extern Fir< std::tuple_size< decltype(rrc_taps_24k) >::value > rrc_24k;
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} /* M17 */
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#endif /* M17_DSP_H */
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