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This commit is contained in:
furrtek
2016-01-31 09:34:24 +01:00
parent 29ec87a9ad
commit 44638e504b
166 changed files with 8700 additions and 3967 deletions
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firmware/baseband/proc_wfm_audio.cpp
+67 -21
View File
@@ -21,45 +21,46 @@
#include "proc_wfm_audio.hpp"
#include "dsp_iir_config.hpp"
#include "audio_output.hpp"
#include <cstdint>
void WidebandFMAudio::execute(buffer_c8_t buffer) {
auto decimator_out = decimator.execute(buffer);
void WidebandFMAudio::execute(const buffer_c8_t& buffer) {
if( !configured ) {
return;
}
const buffer_s16_t work_audio_buffer {
(int16_t*)decimator_out.p,
sizeof(*decimator_out.p) * decimator_out.count
};
auto channel = decimator_out;
const auto decim_0_out = decim_0.execute(buffer, dst_buffer);
const auto channel = decim_1.execute(decim_0_out, dst_buffer);
// TODO: Feed channel_stats post-decimation data?
feed_channel_stats(channel);
//feed_channel_spectrum(channel);
/* 768kHz complex<int16_t>[512]
spectrum_samples += channel.count;
if( spectrum_samples >= spectrum_interval_samples ) {
spectrum_samples -= spectrum_interval_samples;
channel_spectrum.feed(channel, channel_filter_pass_f, channel_filter_stop_f);
}
/* 384kHz complex<int16_t>[256]
* -> FM demodulation
* -> 768kHz int16_t[512] */
* -> 384kHz int16_t[256] */
/* TODO: To improve adjacent channel rejection, implement complex channel filter:
* pass < +/- 100kHz, stop > +/- 200kHz
*/
auto audio_oversampled = demod.execute(decimator_out, work_audio_buffer);
/* 768kHz int16_t[512]
* -> 4th order CIC decimation by 2, gain of 1
* -> 384kHz int16_t[256] */
auto audio_8fs = audio_dec_1.execute(audio_oversampled, work_audio_buffer);
auto audio_oversampled = demod.execute(channel, work_audio_buffer);
/* 384kHz int16_t[256]
* -> 4th order CIC decimation by 2, gain of 1
* -> 192kHz int16_t[128] */
auto audio_4fs = audio_dec_2.execute(audio_8fs, work_audio_buffer);
auto audio_4fs = audio_dec_1.execute(audio_oversampled, work_audio_buffer);
/* 192kHz int16_t[128]
* -> 4th order CIC decimation by 2, gain of 1
* -> 96kHz int16_t[64] */
auto audio_2fs = audio_dec_3.execute(audio_4fs, work_audio_buffer);
auto audio_2fs = audio_dec_2.execute(audio_4fs, work_audio_buffer);
/* 96kHz int16_t[64]
* -> FIR filter, <15kHz (0.156fs) pass, >19kHz (0.198fs) stop, gain of 1
@@ -67,6 +68,51 @@ void WidebandFMAudio::execute(buffer_c8_t buffer) {
auto audio = audio_filter.execute(audio_2fs, work_audio_buffer);
/* -> 48kHz int16_t[32] */
audio_hpf.execute_in_place(audio);
fill_audio_buffer(audio);
audio_output.write(audio);
}
void WidebandFMAudio::on_message(const Message* const message) {
switch(message->id) {
case Message::ID::UpdateSpectrum:
case Message::ID::SpectrumStreamingConfig:
channel_spectrum.on_message(message);
break;
case Message::ID::WFMConfigure:
configure(*reinterpret_cast<const WFMConfigureMessage*>(message));
break;
default:
break;
}
}
void WidebandFMAudio::configure(const WFMConfigureMessage& message) {
constexpr size_t baseband_fs = 3072000;
constexpr size_t decim_0_input_fs = baseband_fs;
constexpr size_t decim_0_decimation_factor = 4;
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_decimation_factor = 2;
constexpr size_t decim_1_output_fs = decim_1_input_fs / decim_1_decimation_factor;
constexpr size_t demod_input_fs = decim_1_output_fs;
constexpr auto spectrum_rate_hz = 50.0f;
spectrum_interval_samples = decim_1_output_fs / spectrum_rate_hz;
spectrum_samples = 0;
decim_0.configure(message.decim_0_filter.taps, 33554432);
decim_1.configure(message.decim_1_filter.taps, 131072);
channel_filter_pass_f = message.decim_1_filter.pass_frequency_normalized * decim_1_input_fs;
channel_filter_stop_f = message.decim_1_filter.stop_frequency_normalized * decim_1_input_fs;
demod.configure(demod_input_fs, message.deviation);
audio_filter.configure(message.audio_filter.taps);
audio_output.configure(audio_hpf_30hz_config, audio_deemph_2122_6_config);
channel_spectrum.set_decimation_factor(1);
configured = true;
}