%Chirp Z的應用
h=fir1(30,125/500,boxcar(31));
Fs=1000;
f1=100;
f2=200;
m=1024;
w=exp(-j*2*pi*(f2-1)/(m*Fs));
a=exp(j*2*pi*f1/Fs);
y=fft(h,m);
z=czt(h,m,w,a);
fy=(0:length(y)-1)'*Fs/length(y);
fz=(0:length(z)-1)'*(f2-f1)/length(z)+f1;
subplot(2,1,1),plot(fy(1:500),abs(y(1:500)));
subplot(2,1,2),plot(fz,abs(z));