说明: 实验7 clear all; wp1=0.2*pi; ws1=0.3*pi; Rp=1; Rs=10; Fs=1; wp2=2*Fs*tan(wp1/2); ws2=2*Fs*tan(ws1/2); [N,Wn]=buttord(wp2,ws2,Rp,Rs,'s'); [Z,P,K]=buttap(N); [Bap,Aap]=zp2tf(Z,P,K); [b,a]=lp2lp(Bap,Aap,Wn); [bz,az]=bilinear(b,a,Fs); [H,W]=freqz(bz,az,64
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