m4.m

FIR、IIR数字滤波器的Matlab仿真程序

fs=100;
fc1=10;
fc2=20;
[n,Wn,beta,ftype]=kaiserord([7 13 17 23],[0 1 0],[0.01 0.01 0.01],100);
w1=2*fc1/fs;
w2=2*fc2/fs;
window=kaiser(n+1,beta);
b=fir1(n,[w1 w2],window);
freqz(b,1,512);
t = (0:100)/fs;
s = sin(2*pi*t*5)+sin(2*pi*t*15)+sin(2*pi*t*30);
sf = filter(b,1,s);