zpbutt - Butterworth analog filter

Calling Sequence

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

Parameters

• 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'))

Author

F. Delebecque INRIA