example7_4.m

西交大刘树棠写的《数字信号处理》那本书的所有源代码

h=[-4,1,-1,-2,5,0,-5,2,1,-1,4];
M=length(h);n=0:M-1;
[Hr,w,c,L]=Hr_Type3(h);
c,L
cmax=max(c)+1;
cmin=min(c)-1;
subplot(2,2,1);stem(n,h);axis([-1 2*L+1 cmin cmax])
xlabel('n');ylabel('h(n)');title('impuse response')
subplot(2,2,3);stem(0:L,c);axis([-1 2*L+1 cmin cmax])
xlabel('n');ylabel('c(n)');title('c(n) coefficient')
subplot(2,2,2);plot(w/pi,Hr);grid
xlabel('frequency in pi units');ylabel('Hr')
title('Type-1 Amplitude Response')
subplot(2,2,4);zplane(h,1)