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> exa070500_1.m, for fig. 7.5.4,
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clear all;
> 梳状滤波器的频率响应和极零图；
M=4096;
r=0.9;
b=[1 0 0 0 0 0 0 0 -1];
a=[1 0 0 0 0 0 0 0 -r];
[h,f]=freqz(b,a,4*M,'whole',1);
subplot(221);
zplane(b,a);
subplot(222)
plot(f,(1+r)*abs(h)/2);grid;