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> exa070903_remez_2.m, for example 7.9.3 and 7.4.2;
> to test remez.m and to design multi-band FIR filter;
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clear all;
> 用切比雪夫最佳一致逼近设计线性相位多带FIR滤波器；
f=[0 .14 .18 .22 .26 .34 .38 .42 .46 .54 .58 .62 .66 1];
A=[1 1 0 0 1 1 0 0 1 1 0 0 1 1];
weigh=[8 1 8 1 8 1 8];
b=remez(64,f,A,weigh);
>
[h,w]=freqz(b,1,256,1);
hr=abs(h);
h=abs(h);
h=20*log10(h);
figure(1)
stem(b,'.');grid;
figure(2)
plot(w,h);grid;