scipy.signal.

sos2zpk

scipy.signal.sos2zpk(sos)

Return zeros, poles, and gain of a series of second-order sections

Parameters:

sosarray_like

Array of second-order filter coefficients, must have shape (n_sections, 6). See sosfilt for the SOS filter format specification.

Returns:

zndarray

Zeros of the transfer function.

pndarray

Poles of the transfer function.

kfloat

System gain.

Notes

The number of zeros and poles returned will be n_sections * 2 even if some of these are (effectively) zero.

Added in version 0.16.0.