gusucode.com > matlab编程一个频分复用系统的模拟源码程序 > matlab编程一个频分复用系统的模拟源码程序/code/DSP_test/text_butt.m

    %巴特沃斯滤波器测试

fp=3000;fs=3500;
rp=3;rs=30;
wp=2*fp/Fs;ws=2*fs/Fs;

[N Wn]=buttord(wp,ws,rp,rs);
[b1 a1]=butter(N,Wn);
[h1 fw]=freqz(b1,a1,256);

fw=fw./pi;   
plot(fw,abs(h1));