Module filter_design 

Filter design routines for calculating biquad IIR coefficients (Low-pass, High-pass, Band-pass, Notch, Peaking, All-pass, Butterworth).

Functions

biquad_allpass_coeffs

Computes Direct Form I Biquad coefficients [b0, b1, b2, a1, a2] for an All-Pass Filter.

biquad_bandpass_coeffs

Computes Direct Form I Biquad coefficients [b0, b1, b2, a1, a2] for a Band-Pass Filter (constant skirt gain).

biquad_highpass_coeffs

Computes Direct Form I Biquad coefficients [b0, b1, b2, a1, a2] for a High-Pass Filter.

biquad_lowpass_coeffs

Computes Direct Form I Biquad coefficients [b0, b1, b2, a1, a2] for a Low-Pass Filter.

biquad_notch_coeffs

Computes Direct Form I Biquad coefficients [b0, b1, b2, a1, a2] for a Notch (Band-Stop) Filter.

biquad_peaking_coeffs

Computes Direct Form I Biquad coefficients [b0, b1, b2, a1, a2] for a Peaking EQ Filter.

butterworth_lowpass_biquads

Calculates multi-stage Butterworth Low-Pass filter biquad coefficients. out_coeffs must be a slice of size 5 * (order / 2).