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- sosfiltfor 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. ]))