Convert digital filter second-order section parameters to zero-pole-gain form
[z,p,k] = sos2zp(sos)
[z,p,k] = sos2zp(sos,g)
sos2zp converts a second-order section representation of a given digital filter to an equivalent zero-pole-gain representation.
sos is an L-by-6 matrix that contains the coefficients of each second-order section in its rows.
Column vectors z and p contain the zeros and poles of the transfer function H(z).
where the orders n and m are determined by the matrix sos.
Compute the zeros, poles, and gain of a simple system in second-order section form.
sos = [1 1 1 1 0 -1; -2 3 1 1 10 1]; [z,p,k] = sos2zp(sos)
z = -0.5000 + 0.8660i -0.5000 - 0.8660i 1.7808 + 0.0000i -0.2808 + 0.0000i p = -1.0000 1.0000 -9.8990 -0.1010 k = -2