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Add 30Hz high-pass IIR filter for wideband FM.

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This commit is contained in:
Jared Boone 2016-01-01 20:55:00 -08:00
parent 9a0fb2cab7
commit 2e90edbf39
2 changed files with 7 additions and 1 deletions
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6
firmware/baseband/dsp_iir_config.hpp
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@ -24,6 +24,12 @@
#include "dsp_iir.hpp" #include "dsp_iir.hpp"
// scipy.signal.butter(2, 30 / 24000.0, 'highpass', analog=False)
constexpr iir_biquad_config_t audio_hpf_30hz_config {
{ 0.99722705f, -1.99445410f, 0.99722705f, },
{ 1.00000000f, -1.99444641f, 0.99446179f, }
};
// scipy.signal.butter(2, 300 / 24000.0, 'highpass', analog=False) // scipy.signal.butter(2, 300 / 24000.0, 'highpass', analog=False)
constexpr iir_biquad_config_t audio_hpf_300hz_config { constexpr iir_biquad_config_t audio_hpf_300hz_config {
{ 0.97261390f, -1.94522780f, 0.97261390f, }, { 0.97261390f, -1.94522780f, 0.97261390f, },

2
firmware/baseband/proc_wfm_audio.hpp
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@ -49,7 +49,7 @@ private:
const fir_taps_real<64>& audio_filter_taps = taps_64_lp_156_198; const fir_taps_real<64>& audio_filter_taps = taps_64_lp_156_198;
dsp::decimate::FIR64AndDecimateBy2Real audio_filter { audio_filter_taps.taps }; dsp::decimate::FIR64AndDecimateBy2Real audio_filter { audio_filter_taps.taps };
IIRBiquadFilter audio_hpf { audio_hpf_config }; IIRBiquadFilter audio_hpf { audio_hpf_30hz_config };
}; };
#endif/*__PROC_WFM_AUDIO_H__*/ #endif/*__PROC_WFM_AUDIO_H__*/