shiyan4_1_1.m

来自「一些关于iir滤波器设计的matlab实验代码」· M 代码 · 共 10 行

%脉冲响应不变法设计ButterWorth低通数字滤波器
wp=0.2*2*pi;
ws=0.3*2*pi;
Ap=1;
As=25;
Fs=1;
[n,Wc]=buttord(wp,ws,Ap,As,'s')
[b,a]=butter(n,Wn,'s')
[bz,az]=impinvar(b,a,1)
freqz(bz,az)