hr_type4.m

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

function [Hr,w,d,L]=hr_type4(h);
% Computes Amplitude response Hr(w) of a Type-4 LP FIR filter
% ---------------------
% [Hr,w,d,L]=hr_type4(h)
% Hr=Amplitude Response
% w=500 frequecies between [0 pi] over which Hr is computed
% d=Type-4 LP filter coefficients
% L=Order of Hr
% h=Type-4 LP filter impulse response
% 
M=length(h);
L=M/2;
d=2*[h(L:-1:1)];
n=[1:L];n=n-0.5;
w=[0:500]'*pi/500;
Hr=sin(w*n)*d';