pyFDN.graphic_eq

pyFDN.graphic_eq(center_omega, shelving_omega, R, gain_db)

Build a graphic EQ as a bank of independent biquad sections.

Band layout (total len(center_omega) + len(shelving_omega) + 1 sections):

• Band 0: flat gain section.

• Band 1: low shelving filter.

• Bands 2 … N-2: peaking bandpass filters.

• Band N-1: high shelving filter.

Parameters:

• center_omega (ndarray) – Center frequencies of bandpass bands in radians, shape (num_center,).

• shelving_omega (ndarray) – Cut-off frequencies of shelving bands in radians, shape (2,) — [low_crossover, high_crossover].

• R (float) – Bandwidth parameter; quality factor is sqrt(R) / (R - 1).

• gain_db (ndarray) – Command gains in dB for each section, shape (num_center + 3,) (flat + low shelf + bandpass + high shelf).

Return type:

ndarray

Returns:

SOS matrix of shape (num_bands, 6) with columns [b0, b1, b2, a0, a1, a2].