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Rebake of AM, NFM demodulators -- more flexible filtering/configuration.

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Also make SpectrumCollector dynamically configurable.
Add deemphasis filter to NFM.
This commit is contained in:
Jared Boone
2015-12-29 10:58:53 -08:00
parent df593c2f0f
commit bbfcca8ec0
8 changed files with 249 additions and 64 deletions
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25
firmware/baseband/proc_nfm_audio.hpp
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@@ -36,22 +36,33 @@
class NarrowbandFMAudio : public BasebandProcessor {
public:
NarrowbandFMAudio() {
decimator.set_decimation_factor(ChannelDecimator::DecimationFactor::By32);
channel_filter.configure(channel_filter_taps.taps, 2);
}
enum class Mode {
Deviation5K = 0,
Deviation2K5Wide = 1,
Deviation2K5Narrow = 2,
};
NarrowbandFMAudio();
void set_mode(const Mode mode);
void execute(const buffer_c8_t& buffer) override;
void on_update_spectrum() override { channel_spectrum.update(); }
private:
ChannelDecimator decimator;
const fir_taps_real<64>& channel_filter_taps = taps_64_lp_042_078_tfilter;
std::array<complex16_t, 512> dst;
dsp::decimate::FIRC8xR16x24FS4Decim8 decim_0;
dsp::decimate::FIRC16xR16x32Decim8 decim_1;
dsp::decimate::FIRAndDecimateComplex channel_filter;
dsp::demodulate::FM demod { 48000, 7500 };
uint32_t channel_filter_pass_f = 0;
uint32_t channel_filter_stop_f = 0;
dsp::demodulate::FM demod;
IIRBiquadFilter audio_hpf { audio_hpf_config };
IIRBiquadFilter audio_deemph { audio_deemph_300_6_config };
FMSquelch squelch;
SpectrumCollector channel_spectrum;