ideal_bs.m

matlab应用实例。如：FIR、IIR数字滤波器设计等。

function hd=ideal_bs(Wcl,Wch,N)
% compute the ideal bandstop 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(Wcl*m)+sin(pi*m)-sin(Wch*m)]./(pi*m);