untitled2dsgdsgdsgsdgsg.m

matla窗口制作

n=51;
f=[0 0.4 0.8 1];
amp=[1 0 1];
up=[1.02 0.02 1.01];
lo=[0.85 -0.02 0.09];
b=fircls(n,f,amp,up,lo);
[h,w]=freqz(b);
plot(w/pi,abs(h));
grid on