?? prog8b7.m
字號:
%
% m-file for Example 8B.7 (Program 8B.7, p574)
% Program name: prog8b7.m
% Band stop filter
%
Fs=1000; % Sampling frequency
Ap=3;
As=20;
Wp=[50/500, 450/500]; % Band edge frequencies
Ws=[200/500, 300/500];
[N, Wc]=buttord(Wp, Ws, Ap, As); % Determine filter order
[zz, pz, kz]=butter(N,Ws, 'stop'); % Digitise filter
[b, a]=butter(N, Ws, 'stop');
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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