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Rebased code from new eried repo commits. Changed to to reflect strijar implementation. Fixed previous issue with old ssb-am-tx ui_mictx code.

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DESKTOP-R56EVJP\Alex 2021-03-21 20:11:40 -05:00
parent 603b7fb1ab
commit f65852ff05
20 changed files with 1545 additions and 16 deletions
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26
firmware/common/dsp_iir.cpp
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@ -55,3 +55,29 @@ void IIRBiquadFilter::execute(const buffer_f32_t& buffer_in, const buffer_f32_t&
void IIRBiquadFilter::execute_in_place(const buffer_f32_t& buffer) {
execute(buffer, buffer);
}
void IIRBiquadDF2Filter::configure(const iir_biquad_df2_config_t& config) {
b0 = config[0] / config[3];
b1 = config[1] / config[3];
b2 = config[2] / config[3];
a1 = config[4] / config[3];
a2 = config[5] / config[3];
}
// scipy.signal.sosfilt
//
// x_n = x[i, n] # make a temporary copy
// # Use direct II transposed structure:
// x[i, n] = b[s, 0] * x_n + zi[i, s, 0]
// zi[i, s, 0] = (b[s, 1] * x_n - a[s, 0] * x[i, n] + zi[i, s, 1])
// zi[i, s, 1] = (b[s, 2] * x_n - a[s, 1] * x[i, n])
float IIRBiquadDF2Filter::execute(float x) {
float y;
y = b0 * x + z0;
z0 = b1 * x - a1 * y + z1;
z1 = b2 * x - a2 * y;
return y;
}