# scipy.signal.sos2zpk¶

scipy.signal.sos2zpk(sos)[source]

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.

New in version 0.16.0.

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