def tf2sos(b, a, pairing='nearest'):
 return zpk2sos(pairing=pairing, *tf2zpk(b, a))

def tf2sos ( b , a , pairing = 'nearest' ) : return zpk2sos ( pairing = pairing , * tf2zpk ( b , a ) )
return second-order sections from transfer function representation parameters b : array_like numerator polynomial coefficients .