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POCSAG Squelch and Filtering (#1424)

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* Disable audio processing when not using squelch
* Add 2k4 lowpass fitler for 24Khz audio for POCSAG
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Kyle Reed 2023-08-30 10:24:35 -07:00 • committed by GitHub
parent f46e20c977
commit 07be74701f
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3 changed files with 18 additions and 7 deletions
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6
firmware/common/dsp_iir_config.hpp
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@ -77,6 +77,12 @@ constexpr iir_biquad_config_t audio_24k_deemph_300_6_config{
{0.03780475f, 0.03780475f, 0.00000000f},
{1.00000000f, -0.92439049f, 0.00000000f}};
// scipy.signal.butter(1, 2400 / 12000.0, 'lowpass', analog=False)
// NOTE: Technically, order-1 filter, b[2] = a[2] = 0.
constexpr iir_biquad_config_t audio_24k_lpf_2400hz_config{
{0.03780475f, 0.03780475f, 0.00000000f},
{1.00000000f, -0.92439049f, 0.00000000f}};
// scipy.signal.butter(1, 300 / 8000.0, 'lowpass', analog=False)
// NOTE: Technically, order-1 filter, b[2] = a[2] = 0.
constexpr iir_biquad_config_t audio_16k_deemph_300_6_config{