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load x;
wp=0.3*pi;ws=0.4*pi; ap=1;as=20; wap=tan(wp/2);was=tan(ws/2); [n,wc]=buttord(wap,was,ap,as,'s'); [z,p,k]=buttap(n); [bp,ap]=zp2tf(z,p,k); [bs,as]=lp2lp(bp,ap,wc); [bz,az]=bilinear(bs,as,0.5); y=filter(bz,az,x); freqz(y); figure:plot(abs(freqz(y)));低通 load x; wp=0.8*pi;ws=0.7*pi; ap=1;as=15; wap=tan(wp/2);was=tan(ws/2); wap1=1;was1=wap/was; [n,wn]=buttord(wap1,was1,ap,as,'s'); [z,p,k]=buttap(n); [bp,ap]=zp2tf(z,p,k); [bs,as]=lp2hp(bp,ap,wap); [bz,az]=bilinear(bs,as,0.5); y=filter(bz,az,x); freqz(y); figure:plot(abs(freqz(y)));高通 load x; wp1=0.4*pi;wp2=0.6*pi; ap=1,as=40; ws1=0.3*pi;ws2=0.7*pi; wap1=tan(wp1/2);wap2=tan(wp2/2); was1=tan(ws1/2);was2=tan(ws2/2); wp0=1;ws0=(was2-was1)/(wap2-wap1); w0=(wap1*wap2).^(1/2); bw=wap2-wap1; [n,wn]=buttord(wp0,ws0,ap,as,'s'); [bp,ap]=butter(n,wn,'s'); [bs,as]=lp2bp(bp,ap,w0,bw); [bz,az]=bilinear(bs,as,0.5); y=filter(bz,az,x); freqz(y); figure:plot(abs(freqz(y)));带通 |
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1个回答
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上下图怎么对应的,例如低通,低通1图怎么对应
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