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Extract FMSquelch into separate files.

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This commit is contained in:
Jared Boone 2015-08-27 09:59:03 -07:00
parent b904971ef2
commit de0777f476
4 changed files with 92 additions and 31 deletions
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32
firmware/baseband/main.cpp
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@ -46,6 +46,7 @@
#include "dsp_fir_taps.hpp"
#include "dsp_iir.hpp"
#include "dsp_iir_config.hpp"
#include "dsp_squelch.hpp"
#include "baseband_stats_collector.hpp"
#include "rssi_stats_collector.hpp"
@ -79,37 +80,6 @@
constexpr auto baseband_thread_priority = NORMALPRIO + 20;
constexpr auto rssi_thread_priority = NORMALPRIO + 10;
class FMSquelch {
public:
bool execute(buffer_s16_t audio) {
// TODO: No hard-coded array size.
std::array<int16_t, N> squelch_energy_buffer;
const buffer_s16_t squelch_energy {
squelch_energy_buffer.data(),
squelch_energy_buffer.size()
};
non_audio_hpf.execute(audio, squelch_energy);
uint64_t max_squared = 0;
for(const auto sample : squelch_energy_buffer) {
const uint64_t sample_squared = sample * sample;
if( sample_squared > max_squared ) {
max_squared = sample_squared;
}
}
return (max_squared < (threshold * threshold));
}
private:
static constexpr size_t N = 32;
static constexpr int16_t threshold = 3072;
// nyquist = 48000 / 2.0
// scipy.signal.iirdesign(wp=8000 / nyquist, ws= 4000 / nyquist, gpass=1, gstop=18, ftype='ellip')
IIRBiquadFilter non_audio_hpf { non_audio_hpf_config };
};
static volatile bool channel_spectrum_request_update { false };
static std::array<complex16_t, 256> channel_spectrum;
static uint32_t channel_spectrum_sampling_rate { 0 };