scipy.signal.

sos2tf#

scipy.signal.sos2tf(sos)[source]#

Return a single transfer function from 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:

bndarray: Numerator polynomial coefficients.
andarray: Denominator polynomial coefficients.

Notes

Added in version 0.16.0.

Examples

Find the polynomial representation of an elliptic filter using its ‘sos’ (second-order sections) format.

>>> from scipy.signal import sos2tf
>>> from scipy import signal
>>> sos = signal.ellip(1, 0.001, 50, 0.1, output='sos')
>>> sos2tf(sos)
(   array([0.91256522, 0.91256522, 0.        ]),
    array([1.        , 0.82513043, 0.        ]))