97 lines
5.0 KiB
C++
97 lines
5.0 KiB
C++
/***************************************************************************
|
|
* Copyright (C) 2021 - 2025 by Federico Amedeo Izzo IU2NUO, *
|
|
* Niccolò Izzo IU2KIN *
|
|
* Wojciech Kaczmarski SP5WWP *
|
|
* Frederik Saraci IU2NRO *
|
|
* Silvano Seva IU2KWO *
|
|
* *
|
|
* *
|
|
* 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 3 of the License, 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; if not, see <http://www.gnu.org/licenses/> *
|
|
***************************************************************************/
|
|
|
|
#ifndef M17_DSP_H
|
|
#define M17_DSP_H
|
|
|
|
#ifndef __cplusplus
|
|
#error This header is C++ only!
|
|
#endif
|
|
|
|
#include <fir.hpp>
|
|
#include <array>
|
|
|
|
namespace M17
|
|
{
|
|
|
|
/*
|
|
* Coefficients for M17 RRC filters
|
|
*/
|
|
static constexpr std::array<float, 81> rrc_taps_48k =
|
|
{
|
|
-0.003195702904062073, -0.002930279157647190, -0.001940667871554463,
|
|
-0.000356087678023658, 0.001547011339077758, 0.003389554791179751,
|
|
0.004761898604225673, 0.005310860846138910, 0.004824746306020221,
|
|
0.003297923526848786, 0.000958710871218619, -0.001749908029791816,
|
|
-0.004238694106631223, -0.005881783042101693, -0.006150256456781309,
|
|
-0.004745376707651645, -0.001704189656473565, 0.002547854551539951,
|
|
0.007215575568844704, 0.011231038205363532, 0.013421952197060707,
|
|
0.012730475385624438, 0.008449554307303753, 0.000436744366018287,
|
|
-0.010735380379191660, -0.023726883538258272, -0.036498030780605324,
|
|
-0.046500883189991064, -0.050979050575999614, -0.047340680079891187,
|
|
-0.033554880492651755, -0.008513823955725943, 0.027696543159614194,
|
|
0.073664520037517042, 0.126689053778116234, 0.182990955139333916,
|
|
0.238080025892859704, 0.287235637987091563, 0.326040247765297220,
|
|
0.350895727088112619, 0.359452932027607974, 0.350895727088112619,
|
|
0.326040247765297220, 0.287235637987091563, 0.238080025892859704,
|
|
0.182990955139333916, 0.126689053778116234, 0.073664520037517042,
|
|
0.027696543159614194, -0.008513823955725943, -0.033554880492651755,
|
|
-0.047340680079891187, -0.050979050575999614, -0.046500883189991064,
|
|
-0.036498030780605324, -0.023726883538258272, -0.010735380379191660,
|
|
0.000436744366018287, 0.008449554307303753, 0.012730475385624438,
|
|
0.013421952197060707, 0.011231038205363532, 0.007215575568844704,
|
|
0.002547854551539951, -0.001704189656473565, -0.004745376707651645,
|
|
-0.006150256456781309, -0.005881783042101693, -0.004238694106631223,
|
|
-0.001749908029791816, 0.000958710871218619, 0.003297923526848786,
|
|
0.004824746306020221, 0.005310860846138910, 0.004761898604225673,
|
|
0.003389554791179751, 0.001547011339077758, -0.000356087678023658,
|
|
-0.001940667871554463, -0.002930279157647190, -0.003195702904062073,
|
|
};
|
|
|
|
static constexpr std::array<float, 41> rrc_taps_24k =
|
|
{
|
|
-0.002021130037130002, -0.001227380092907312, 0.000978411066065117,
|
|
0.003011674298801149, 0.003051422479929027, 0.000606339011138998,
|
|
-0.002680772347838965, -0.003889744583281823, -0.001077818873364855,
|
|
0.004563508234396922, 0.008488746155946006, 0.005343941074480147,
|
|
-0.006789617306671533, -0.023083267913613266, -0.032241823935683658,
|
|
-0.021221865389865011, 0.017516745763008643, 0.080124798723015214,
|
|
0.150574288667793071, 0.206204943905808818, 0.227336876945597260,
|
|
0.206204943905808818, 0.150574288667793071, 0.080124798723015214,
|
|
0.017516745763008643, -0.021221865389865011, -0.032241823935683658,
|
|
-0.023083267913613266, -0.006789617306671533, 0.005343941074480147,
|
|
0.008488746155946006, 0.004563508234396922, -0.001077818873364855,
|
|
-0.003889744583281823, -0.002680772347838965, 0.000606339011138998,
|
|
0.003051422479929027, 0.003011674298801149, 0.000978411066065117,
|
|
-0.001227380092907312, -0.002021130037130002,
|
|
};
|
|
|
|
/*
|
|
* FIR implementations of the RRC filter for baseband audio generation.
|
|
*/
|
|
extern Fir< std::tuple_size< decltype(rrc_taps_48k) >::value > rrc_48k;
|
|
extern Fir< std::tuple_size< decltype(rrc_taps_24k) >::value > rrc_24k;
|
|
|
|
} /* M17 */
|
|
|
|
#endif /* M17_DSP_H */
|