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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.cpp
+38 -8
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@@ -45,10 +45,26 @@ void NarrowbandAMAudio::execute(const buffer_c8_t& buffer) {
}
const auto decim_0_out = decim_0.execute(buffer, dst_buffer);
const auto decim_1_out = decim_1.execute(decim_0_out, dst_buffer);
const auto audio_decim_0_out = audio_decim_0.execute(decim_0_out, dst_buffer);
channel_spectrum.feed(decim_1_out, channel_filter_low_f, channel_filter_high_f, channel_filter_transition);
spectrum_samples += decim_0_out.count;
if (!spectrum_capture_active &&
spectrum_samples >= spectrum_interval_samples) {
spectrum_samples -= spectrum_interval_samples;
channel_spectrum.start_filtered_capture(spectrum_zoom_x2 ? 4 : 2);
spectrum_capture_active = true;
}
if (spectrum_capture_active &&
channel_spectrum.feed_filtered(
audio_decim_0_out,
channel_filter_low_f,
channel_filter_high_f,
channel_filter_transition)) {
spectrum_capture_active = false;
}
const auto decim_1_out = translating_decim_1.execute(audio_decim_0_out, dst_buffer);
const auto decim_2_out = decim_2.execute(decim_1_out, dst_buffer);
const auto channel_out = channel_filter.execute(decim_2_out, dst_buffer);
@@ -97,6 +113,10 @@ void NarrowbandAMAudio::on_message(const Message* const message) {
capture_config(*reinterpret_cast<const CaptureConfigMessage*>(message));
break;
case Message::ID::AudioDDCConfig:
ddc_config(*reinterpret_cast<const AudioDDCConfigMessage*>(message));
break;
default:
break;
}
@@ -106,17 +126,19 @@ void NarrowbandAMAudio::configure(const AMConfigureMessage& message) {
constexpr size_t decim_0_input_fs = baseband_fs;
constexpr size_t decim_0_output_fs = decim_0_input_fs / decim_0.decimation_factor;
constexpr size_t decim_1_input_fs = decim_0_output_fs;
constexpr size_t decim_1_output_fs = decim_1_input_fs / decim_1.decimation_factor;
constexpr size_t audio_decim_0_output_fs = decim_0_output_fs / 2;
constexpr size_t decim_1_output_fs =
audio_decim_0_output_fs / translating_decim_1.decimation_factor;
constexpr size_t decim_2_input_fs = decim_1_output_fs;
constexpr size_t decim_2_output_fs = decim_2_input_fs / decim_2_decimation_factor;
constexpr size_t channel_filter_input_fs = decim_2_output_fs;
// const size_t channel_filter_output_fs = channel_filter_input_fs / channel_filter_decimation_factor;
decim_0.configure(message.decim_0_filter.taps);
decim_1.configure(message.decim_1_filter.taps);
decim_0.configure(message.decim_0_filter.taps, 33554432);
audio_decim_0.configure(taps_audio_wide_halfband_0.taps);
translating_decim_1.configure(
message.decim_1_filter.taps, audio_decim_0_output_fs);
decim_2.configure(message.decim_2_filter.taps, decim_2_decimation_factor);
channel_filter.configure(message.channel_filter.taps, channel_filter_decimation_factor);
channel_filter_low_f = message.channel_filter.low_frequency_normalized * channel_filter_input_fs;
@@ -124,12 +146,20 @@ void NarrowbandAMAudio::configure(const AMConfigureMessage& message) {
channel_filter_transition = message.channel_filter.transition_normalized * channel_filter_input_fs;
modulation_ssb = (int)message.modulation; // now sending by message , 3 types of AM demod : enum class Modulation : int32_t {DSB = 0, SSB = 1, SSB_FM = 2}
channel_spectrum.set_decimation_factor(message.channel_spectrum_decimation_factor);
spectrum_zoom_x2 = message.channel_spectrum_decimation_factor == 2;
channel_spectrum.set_decimation_factor(1);
spectrum_interval_samples =
decim_0_output_fs / spectrum_rate_hz;
audio_output.configure(message.audio_hpf_lpf_config); // hpf in all AM demod modes (AM-6K/9K, USB/LSB,DSB), except Wefax (lpf there).
configured = true;
}
void NarrowbandAMAudio::ddc_config(const AudioDDCConfigMessage& message) {
translating_decim_1.set_frequency(message.frequency);
channel_spectrum.set_channel_filter_offset(message.frequency);
}
void NarrowbandAMAudio::capture_config(const CaptureConfigMessage& message) {
if (message.config) {
audio_output.set_stream(std::make_unique<StreamInput>(message.config));