% Chapter 7: Example 7.5 Type-2 Linear phase FIR filter
%
subplot(1,1,1)
h = [-4,1,-1,-2,5,6,6,5,-2,-1,1,-4];
M = length(h); n = 0:M-1;
[Hr,w,b,L] = Hr_Type2(h);
bmax = max(b)+1; bmin = min(b)-1;
subplot(2,2,1); stem(n,h); axis([-1 2*L+1 bmin bmax])
xlabel('n'); ylabel('h(n)'); title('Impulse Response')
subplot(2,2,3); stem(1:L,b); axis([-1 2*L+1 bmin bmax])
xlabel('n'); ylabel('b(n)'); title('b(n) coefficients')
subplot(2,2,2);plot(w/pi,Hr);grid
xlabel('frequency in pi units'); ylabel('Hr')
title('Type-2 Amplitude Response')
subplot(2,2,4);zplane(h,1)