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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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24
firmware/baseband/dsp_squelch.cpp
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@ -24,22 +24,30 @@
#include <cstdint>
#include <array>
bool FMSquelch::execute(buffer_s16_t audio) {
bool FMSquelch::execute(const buffer_f32_t& audio) {
if( threshold_squared == 0.0f ) {
return true;
}
// TODO: No hard-coded array size.
std::array<int16_t, N> squelch_energy_buffer;
const buffer_s16_t squelch_energy {
std::array<float, N> squelch_energy_buffer;
const buffer_f32_t squelch_energy {
squelch_energy_buffer.data(),
squelch_energy_buffer.size()
};
non_audio_hpf.execute(audio, squelch_energy);
uint64_t max_squared = 0;
float non_audio_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;
const float sample_squared = sample * sample;
if( sample_squared > non_audio_max_squared ) {
non_audio_max_squared = sample_squared;
}
}
return (max_squared < (threshold * threshold));
return (non_audio_max_squared < threshold_squared);
}
void FMSquelch::set_threshold(const float new_value) {
threshold_squared = new_value * new_value;
}