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# scipy.signal.sos2zpk

`scipy.signal.``sos2zpk`(sos)

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

  Parameters: | sos : array_like Array of second-order filter coefficients, must have shape `(n_sections, 6)`. See `sosfilt` for the SOS filter format specification.
  Returns: | z : ndarray Zeros of the transfer function. p : ndarray Poles of the transfer function. k : float System gain.

  Notes

  New in version 0.16.0.