test2.m

很多matlab的源代码

N1=2000;
d=[1 zeros(1,N1-1) 0.7 zeros(1,N1-1) 0.5];
n=[1];
H1=freqz(n,d,1024);
H2=freqz(d,n,1024);
subplot(3,1,1);
plot(abs(H1));
subplot(3,1,2);
plot(abs(H2));
subplot(3,1,3);
plot(abs(H1).*abs(H2));