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Add sliding-frequency audio receiver tuning

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This commit is contained in:
Belousov Oleg
2026-07-27 21:07:48 +03:00
parent c4f32ac436
commit ccf093b5d5
20 changed files with 790 additions and 69 deletions
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firmware/baseband/proc_am_audio.hpp
+10 -2
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@@ -28,6 +28,7 @@
#include "dsp_decimate.hpp"
#include "dsp_demodulate.hpp"
#include "dsp_frequency_xlator.hpp"
#include "audio_compressor.hpp"
#include "audio_output.hpp"
@@ -44,6 +45,7 @@ class NarrowbandAMAudio : public BasebandProcessor {
private:
static constexpr size_t baseband_fs = 3072000;
static constexpr auto spectrum_rate_hz = 30.0f;
static constexpr size_t decim_2_decimation_factor = 4;
static constexpr size_t channel_filter_decimation_factor = 1;
@@ -56,14 +58,19 @@ class NarrowbandAMAudio : public BasebandProcessor {
audio.data(),
audio.size()};
dsp::decimate::FIRC8xR16x24FS4Decim8 decim_0{};
dsp::decimate::FIRC16xR16x32Decim8 decim_1{};
dsp::decimate::FIRC8xR16x24FS4Decim4 decim_0{};
dsp::decimate::FIRC16xR16x16Decim2 audio_decim_0{};
dsp::FrequencyTranslatingDecimator32By8 translating_decim_1{};
dsp::decimate::FIRAndDecimateComplex decim_2{};
dsp::decimate::FIRAndDecimateComplex channel_filter{};
int32_t channel_filter_low_f = 0;
int32_t channel_filter_high_f = 0;
int32_t channel_filter_transition = 0;
bool configured{false};
size_t spectrum_interval_samples{0};
size_t spectrum_samples{0};
bool spectrum_capture_active{false};
bool spectrum_zoom_x2{false};
// 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.
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}
@@ -86,6 +93,7 @@ class NarrowbandAMAudio : public BasebandProcessor {
#endif
void configure(const AMConfigureMessage& message);
void ddc_config(const AudioDDCConfigMessage& message);
void capture_config(const CaptureConfigMessage& message);
buffer_f32_t demodulate(const buffer_c16_t& channel);