imp_invr.m

the file contain many matlab signal source code and many example .

function [b,a]=imp_invr(c,d,T)
% Impulse Invariance Transformation from Analog to Digital Filter
% --------------------------------
% [b,a]=imp_invr(c,d,T)
% b=Numerator polynomial in z^(-1) of the digital filter
% a=Denominator polynomial in z^(-1) of the digital filter
% c=Numerator polynomial in s of the analog filter 
% d=Denominator polynomial in s of the analog filter 
% T=Sampling(transformation) parameter
%
[R,p,k]=residue(c,d);
p=exp(p*T);
[b,a]=residuez(R,p,k);
b=real(b');a=real(a');