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Extract FMSquelch into separate files.
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@ -132,6 +132,7 @@ CPPSRC = main.cpp \
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channel_decimator.cpp \
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dsp_decimate.cpp \
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dsp_demodulate.cpp \
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dsp_squelch.cpp \
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clock_recovery.cpp \
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access_code_correlator.cpp \
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packet_builder.cpp \
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45
firmware/baseband/dsp_squelch.cpp
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45
firmware/baseband/dsp_squelch.cpp
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@ -0,0 +1,45 @@
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/*
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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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#include "dsp_squelch.hpp"
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#include <cstdint>
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#include <array>
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bool FMSquelch::execute(buffer_s16_t audio) {
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// TODO: No hard-coded array size.
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std::array<int16_t, N> squelch_energy_buffer;
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const buffer_s16_t squelch_energy {
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squelch_energy_buffer.data(),
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squelch_energy_buffer.size()
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};
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non_audio_hpf.execute(audio, squelch_energy);
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uint64_t max_squared = 0;
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for(const auto sample : squelch_energy_buffer) {
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const uint64_t sample_squared = sample * sample;
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if( sample_squared > max_squared ) {
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max_squared = sample_squared;
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}
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}
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return (max_squared < (threshold * threshold));
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}
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45
firmware/baseband/dsp_squelch.hpp
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45
firmware/baseband/dsp_squelch.hpp
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@ -0,0 +1,45 @@
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/*
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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_SQUELCH_H__
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#define __DSP_SQUELCH_H__
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#include "buffer.hpp"
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#include "dsp_iir.hpp"
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#include "dsp_iir_config.hpp"
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#include <cstdint>
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#include <cstddef>
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class FMSquelch {
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public:
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bool execute(buffer_s16_t audio);
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private:
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static constexpr size_t N = 32;
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static constexpr int16_t threshold = 3072;
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// nyquist = 48000 / 2.0
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// scipy.signal.iirdesign(wp=8000 / nyquist, ws= 4000 / nyquist, gpass=1, gstop=18, ftype='ellip')
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IIRBiquadFilter non_audio_hpf { non_audio_hpf_config };
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};
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#endif/*__DSP_SQUELCH_H__*/
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@ -46,6 +46,7 @@
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#include "dsp_fir_taps.hpp"
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#include "dsp_iir.hpp"
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#include "dsp_iir_config.hpp"
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#include "dsp_squelch.hpp"
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#include "baseband_stats_collector.hpp"
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#include "rssi_stats_collector.hpp"
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@ -79,37 +80,6 @@
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constexpr auto baseband_thread_priority = NORMALPRIO + 20;
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constexpr auto rssi_thread_priority = NORMALPRIO + 10;
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class FMSquelch {
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public:
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bool execute(buffer_s16_t audio) {
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// TODO: No hard-coded array size.
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std::array<int16_t, N> squelch_energy_buffer;
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const buffer_s16_t squelch_energy {
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squelch_energy_buffer.data(),
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squelch_energy_buffer.size()
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};
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non_audio_hpf.execute(audio, squelch_energy);
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uint64_t max_squared = 0;
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for(const auto sample : squelch_energy_buffer) {
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const uint64_t sample_squared = sample * sample;
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if( sample_squared > max_squared ) {
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max_squared = sample_squared;
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}
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}
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return (max_squared < (threshold * threshold));
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}
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private:
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static constexpr size_t N = 32;
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static constexpr int16_t threshold = 3072;
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// nyquist = 48000 / 2.0
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// scipy.signal.iirdesign(wp=8000 / nyquist, ws= 4000 / nyquist, gpass=1, gstop=18, ftype='ellip')
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IIRBiquadFilter non_audio_hpf { non_audio_hpf_config };
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};
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static volatile bool channel_spectrum_request_update { false };
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static std::array<complex16_t, 256> channel_spectrum;
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static uint32_t channel_spectrum_sampling_rate { 0 };
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