zpbutt

Butterworth analog filter

Calling Sequence

[pols,gain]=zpbutt(n,omegac)

Arguments

:n integer (filter order) : :omegac real (cut-off frequency in Hertz) : :pols resulting poles of filter : :gain resulting gain of filter :

Description

computes the poles of a Butterworth analog filter of order n and cutoff frequency omegac transfer function H(s) is calculated by H(s)=gain/real(poly(pols,’s’))