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Add IIR configs for fs=24kHz NBFM and fs=12kHz AM.

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This commit is contained in:
Jared Boone 2016-01-29 18:31:03 -08:00
parent 28e5b7e4af
commit 65d224be14
1 changed files with 26 additions and 0 deletions
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26
firmware/common/dsp_iir_config.hpp
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@ -36,12 +36,24 @@ constexpr iir_biquad_config_t audio_48k_hpf_300hz_config {
{ 1.00000000f, -1.94447766f, 0.94597794f } { 1.00000000f, -1.94447766f, 0.94597794f }
}; };
// scipy.signal.butter(2, 300 / 12000.0, 'highpass', analog=False)
constexpr iir_biquad_config_t audio_24k_hpf_300hz_config {
{ 0.94597686f, -1.89195371f, 0.94597686f },
{ 1.00000000f, -1.88903308f, 0.89487434f }
};
// scipy.signal.butter(2, 300 / 8000.0, 'highpass', analog=False) // scipy.signal.butter(2, 300 / 8000.0, 'highpass', analog=False)
constexpr iir_biquad_config_t audio_16k_hpf_300hz_config { constexpr iir_biquad_config_t audio_16k_hpf_300hz_config {
{ 0.92006616f, -1.84013232f, 0.92006616f }, { 0.92006616f, -1.84013232f, 0.92006616f },
{ 1.00000000f, -1.83373266f, 0.84653197f } { 1.00000000f, -1.83373266f, 0.84653197f }
}; };
// scipy.signal.butter(2, 300 / 6000.0, 'highpass', analog=False)
constexpr iir_biquad_config_t audio_12k_hpf_300hz_config {
{ 0.89485861f, -1.78971721f, 0.89485861f },
{ 1.00000000f, -1.77863178f, 0.80080265f }
};
// scipy.signal.butter(2, 300 / 4000.0, 'highpass', analog=False) // scipy.signal.butter(2, 300 / 4000.0, 'highpass', analog=False)
constexpr iir_biquad_config_t audio_8k_hpf_300hz_config { constexpr iir_biquad_config_t audio_8k_hpf_300hz_config {
{ 0.84645925f, -1.69291851f, 0.84645925f }, { 0.84645925f, -1.69291851f, 0.84645925f },
@ -61,6 +73,13 @@ constexpr iir_biquad_config_t audio_48k_deemph_300_6_config {
{ 1.00000000f, -0.96148145f, 0.00000000f } { 1.00000000f, -0.96148145f, 0.00000000f }
}; };
// scipy.signal.butter(1, 300 / 12000.0, 'lowpass', analog=False)
// NOTE: Technically, order-1 filter, b[2] = a[2] = 0.
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, 300 / 8000.0, 'lowpass', analog=False) // scipy.signal.butter(1, 300 / 8000.0, 'lowpass', analog=False)
// NOTE: Technically, order-1 filter, b[2] = a[2] = 0. // NOTE: Technically, order-1 filter, b[2] = a[2] = 0.
constexpr iir_biquad_config_t audio_16k_deemph_300_6_config { constexpr iir_biquad_config_t audio_16k_deemph_300_6_config {
@ -68,6 +87,13 @@ constexpr iir_biquad_config_t audio_16k_deemph_300_6_config {
{ 1.00000000f, -0.88862213f, 0.00000000f } { 1.00000000f, -0.88862213f, 0.00000000f }
}; };
// scipy.signal.butter(1, 300 / 6000.0, 'lowpass', analog=False)
// NOTE: Technically, order-1 filter, b[2] = a[2] = 0.
constexpr iir_biquad_config_t audio_12k_deemph_300_6_config {
{ 0.07295966f, 0.07295966f, 0.00000000f },
{ 1.00000000f, -0.85408069f, 0.00000000f }
};
// scipy.signal.butter(1, 300 / 4000.0, 'lowpass', analog=False) // scipy.signal.butter(1, 300 / 4000.0, 'lowpass', analog=False)
// NOTE: Technically, order-1 filter, b[2] = a[2] = 0. // NOTE: Technically, order-1 filter, b[2] = a[2] = 0.
constexpr iir_biquad_config_t audio_8k_deemph_300_6_config { constexpr iir_biquad_config_t audio_8k_deemph_300_6_config {