ideal_bp1.m

新版Matlab 7辅助信号处理技术与应用

function hd=ideal_bp1(Wcl,Wch,N)
% compute the ideal bandpass fiter unit pulse respondence hd(n)
% wcl: low cutoff frequency
% wch: high cutoff frequency
% N: window length
% hd: unit pulse respondence 

alpha = (N-1)/2;
n=0:1:N-1;
m=n-alpha+eps;
hd=[sin(Wch*m)-sin(Wcl*m)]./(pi*m);