kopia lustrzana https://github.com/OpenRTX/OpenRTX
60 wiersze
2.4 KiB
C++
60 wiersze
2.4 KiB
C++
/***************************************************************************
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* Copyright (C) 2021 - 2023 by Federico Amedeo Izzo IU2NUO, *
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* Niccolò Izzo IU2KIN *
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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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#include <limits.h>
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#include <inttypes.h>
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#include <stdio.h>
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#include "M17/M17DSP.hpp"
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#define IMPULSE_SIZE 4096
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using namespace std;
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/**
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* Test the different demodulation steps
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*/
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int main()
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{
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// Open file
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FILE *baseband_out = fopen("M17_rrc_impulse_response.raw", "wb");
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if (!baseband_out)
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{
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perror("Error in opening output file");
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return -1;
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}
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// Allocate impulse signal
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int16_t impulse[IMPULSE_SIZE] = { 0 };
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impulse[0] = SHRT_MAX;
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// Apply RRC on impulse signal
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int16_t filtered_impulse[IMPULSE_SIZE] = { 0 };
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for(size_t i = 0; i < IMPULSE_SIZE; i++)
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{
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float elem = static_cast< float >(impulse[i]);
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filtered_impulse[i] = static_cast< int16_t >(M17::rrc_48k(0.10 * elem));
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}
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fwrite(filtered_impulse, IMPULSE_SIZE, 1, baseband_out);
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fclose(baseband_out);
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return 0;
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}
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