?? prog8b4.m
字號:
%
% m-file for Example 8B.4 (Program 8B.4, p569)
% Program name: prog8b4.m
%
Fs=8000; % Sampling frequency
Ap=3;
As=20;
wp=500/4000;
ws=2000/4000;
[N, wc]=buttord(wp, ws, Ap, As); % Determine filter order
[zz, pz, kz]=butter(N,500/4000); % Digitise filter
[b, a]=butter(N, 500/4000);
subplot(2,1,1) % Plot magnitude freq. response
[H, f]=freqz(b, a, 512, Fs);
plot(f, abs(H))
xlabel('Frequency (Hz)')
ylabel('Magnitude Response ')
subplot(2,1,2) % Plot pole-zero diagram
zplane(b, a)
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