?? prog81.m
字號:
%
% Program 8.1, p511. m-file for the analog filter design
% (Example 8.19)
% program name: prog81.m
%
FN=1000/2;
fc=300; % cut offf frequency
N=5; % filter order
[z, p, k]=buttap(N); % create an analog filter
w=linspace(0, FN/fc, 1000); % plot the response of filter
h=freqs(k*poly(z), poly(p), w);
f=fc*w;
plot(f, 20*log10(abs(h))), grid
ylabel('Magnitude (dB)')
xlabel('Frequency (Hz)')
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