lb.m

我的数字信号处理课程设计

wp=0.2;ws=0.4;rp=0.5;rs=40;
[N,Wc]=buttord(wp,ws,rp,rs);
[num,den]=butter(N,Wc);
[h,f]=freqz(num,den,256,1000);
plot(f,abs(h));