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b8ad44c431
* AM: add opt-in channel-power squelch for AM audio RX Add an SDR++-style power squelch on the complex channel signal for the Analog Audio RX app in AM modes (DSB/SSB/CW). The squelch measures the mean channel power, converts it to dBFS, and mutes the demodulated audio when the signal is below a user-set threshold. Being carrier-based it keys on the AM carrier (e.g. airband/ATC) rather than on audio-band noise, which the existing FM squelch could not do for AM. A new 'SQ' field (0-99, 0 = off) is added to the AM options view and is persisted per app via app_settings. Default is 0, so existing AM behaviour is unchanged unless the user enables it. Threshold maps 1..99 to -80..-20 dBFS. Touches: message (AMConfigureMessage.squelch_level), baseband_api (AMConfig::apply), receiver_model (am_squelch_level get/set), app_settings (persistence), proc_am_audio (DSP), analog_audio_app (UI). * Refactor audio power calculation to use magnitude squared Co-authored-by: Copilot Autofix powered by AI <175728472+Copilot@users.noreply.github.com> --------- Co-authored-by: Copilot Autofix powered by AI <175728472+Copilot@users.noreply.github.com>
104 lines
3.8 KiB
C++
104 lines
3.8 KiB
C++
/*
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* Copyright (C) 2014 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 __PROC_AM_AUDIO_H__
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#define __PROC_AM_AUDIO_H__
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#include "baseband_processor.hpp"
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#include "baseband_thread.hpp"
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#include "rssi_thread.hpp"
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#include "dsp_decimate.hpp"
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#include "dsp_demodulate.hpp"
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#include "dsp_frequency_xlator.hpp"
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#include "audio_compressor.hpp"
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#include "audio_output.hpp"
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#include "filtered_spectrum_collector.hpp"
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#include <cstdint>
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class NarrowbandAMAudio : public BasebandProcessor {
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public:
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NarrowbandAMAudio(); // Phase 2: Explicit constructor for manual thread start
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void execute(const buffer_c8_t& buffer) override;
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void on_message(const Message* const message) override;
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private:
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static constexpr size_t baseband_fs = 3072000;
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static constexpr auto spectrum_rate_hz = 30.0f;
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static constexpr size_t decim_2_decimation_factor = 4;
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static constexpr size_t channel_filter_decimation_factor = 1;
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std::array<complex16_t, 512> dst{};
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const buffer_c16_t dst_buffer{
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dst.data(),
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dst.size()};
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std::array<float, 32> audio{};
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const buffer_f32_t audio_buffer{
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audio.data(),
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audio.size()};
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dsp::decimate::FIRC8xR16x24FS4Decim4 decim_0{};
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dsp::decimate::FIRC16xR16x16Decim2 audio_decim_0{};
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dsp::FrequencyTranslatingDecimator32By8 translating_decim_1{};
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dsp::decimate::FIRAndDecimateComplex decim_2{};
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dsp::decimate::FIRAndDecimateComplex channel_filter{};
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int32_t channel_filter_low_f = 0;
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int32_t channel_filter_high_f = 0;
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int32_t channel_filter_transition = 0;
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bool configured{false};
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uint8_t squelch_level{0}; // AM channel-power squelch threshold (0 = off), SDR++-style
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size_t spectrum_interval_samples{0};
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size_t spectrum_samples{0};
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bool spectrum_capture_active{false};
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size_t spectrum_decimation_factor{2};
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// bool modulation_ssb = false; // Origianlly we only had 2 AM demod types {DSB = 0, SSB = 1} , and we could handle it with bool var , 1 bit.
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int8_t modulation_ssb = 0; // Now we have 3 AM demod types we will send now index integer {DSB = 0, SSB = 1, SSB_FM = 2}
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dsp::demodulate::AM demod_am{};
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dsp::demodulate::SSB demod_ssb{};
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dsp::demodulate::SSB_FM demod_ssb_fm{}; // added for Wfax mode.
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FeedForwardCompressor audio_compressor{};
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AudioOutput audio_output{};
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AMFilteredSpectrumCollector channel_spectrum{};
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/* NB: Threads should be the last members in the class definition. */
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#ifdef PRALINE
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BasebandThread baseband_thread{baseband_fs, this, baseband::Direction::Receive,
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/*auto_start*/ false}; // Phase 2: Manual start
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RSSIThread rssi_thread{/*auto_start*/ false}; // Phase 2: Manual start
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#else
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BasebandThread baseband_thread{baseband_fs, this, baseband::Direction::Receive};
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RSSIThread rssi_thread{};
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#endif
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void configure(const AMConfigureMessage& message);
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void ddc_config(const AudioDDCConfigMessage& message);
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void capture_config(const CaptureConfigMessage& message);
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buffer_f32_t demodulate(const buffer_c16_t& channel);
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};
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#endif /*__PROC_AM_AUDIO_H__*/
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