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实验7clearall;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