我想问具体怎样写一个M文件,举个例子吧。
追答b1=conv(1,conv([1,-1],[1,-1]));
a1=conv([1,-0.4],[1,-0.88,0.61]);
w=[0:1:500]*pi/500;
figure(1)
freqz(b1,a1,w);
b2=conv(conv(0.0534,[1,1]),conv([1,-1.0166,1],[1,-1.0166,1]));
a2=conv([1,-0.683],[1,-1.4461,0.7957]);
figure(2)
freqz(b2,a2,w);
b3=conv(conv([1,-1],[1,-1]),conv([1,-1],[1,-1]));
a3=conv([1,-1.499,0.8482],[1,-1.5548,0.6493]);
figure(3)
freqz(b3,a3,w);