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# scipy.signal.sos2tf

`scipy.signal.``sos2tf`(sos)

  Return a single transfer function from 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: | b : ndarray Numerator polynomial coefficients. a : ndarray Denominator polynomial coefficients.

  Notes

  New in version 0.16.0.