designfilter.m

DTMF编解码在MATLAB中的仿真（gui设计）

%DesignFilter.m
function B=DesignFilter(W0)
fs=8000;
N=33;
k=2*pi/fs;
Bandwidth=70;
wc1=(W0-Bandwidth/2)*k;
wc2=(W0+Bandwidth/2)*k;
B=fir2(N,[0,wc1,wc2,1],[0,1,1,0]);