code from digital signal processing using matlab, 3rd edition

M = 25;
alpha = (M-1)/2;
n = 0:M-1;
hd = (2/pi)*((sin((pi/2)*(n-alpha)).^2)./(n-alpha));
hd(alpha+1)=0;
w_han = '(hann(M))';
h = hd .* w_han.';
[Hr,w,c,L] = Hr_Type3(h);
subplot(2,2,1); stem(n,hd); title('Ideal Impulse Response')
axis([-1 M -1.2 1.2]); xlabel('n'); ylabel('hd(n)')

subplot(2,2,2);
stem(n,w_han);                
title('Hann Window');
axis([-1 M 0 1.2]); xlabel ' n '); ylabel('w(n)')
subplot(2,2,3); stem(n,h);title('Actual Impulse Response')
axis([-1 M -1.2 1.2]); xlabel('n'); ylabel('h(n)')
w = w'; Hr = Hr';
w = [-fliplr(w), w(2:501)]; Hr = [-fliplr(Hr), Hr(2:501)];
subplot(2,2,4);plot(w/pi,Hr); title('Amplitude Response');grid;
xlabel('frequency in pi units'); ylabel('Hr'); axis([-1 1 -1.1 1.1]);

[Image Analyst]

What about it? Do you have a question about it? Doesn't run for me because you forgot to include Hr_Type3(). Please supply the function Hr_Type3() if you want us to try the code.

[muhammad nur adri nawi]

function [Hr,w,c,L] = Hr_Type3(h)

M=length(h);

L=(M-1)/2;

c=[2*h(L+1:-1:1)];

n=[0:1:L];

w=[0:1:500]'*pi/500;

Hr=sin(w*n)*c';

end

Answer 1

[KALYAN ACHARJYA]

Note: Here This

w_han = '(hann(M))';

To this > May be Hanning Window here

w_han =hann(M)';

Complete Code:

M = 25;
alpha = (M-1)/2;
n = 0:M-1;
hd = (2/pi)*((sin((pi/2)*(n-alpha)).^2)./(n-alpha));
hd(alpha+1)=0;
w_han =hann(M)';
h = hd .* w_han.';
[Hr,w,c,L] = Hr_Type3(h);
subplot(2,2,1); stem(n,hd); title('Ideal Impulse Response')
axis([-1 M -1.2 1.2]); xlabel('n'); ylabel('hd(n)')
subplot(2,2,2);
stem(n,w_han);                
title('Hann Window');
axis([-1 M 0 1.2]); xlabel ' n '); ylabel('w(n)')
subplot(2,2,3); stem(n,h);title('Actual Impulse Response')
axis([-1 M -1.2 1.2]); xlabel('n'); ylabel('h(n)')
w = w'; Hr = Hr';
w = [-fliplr(w), w(2:501)]; Hr = [-fliplr(Hr), Hr(2:501)];
subplot(2,2,4);plot(w/pi,Hr); title('Amplitude Response');grid;
xlabel('frequency in pi units'); ylabel('Hr'); axis([-1 1 -1.1 1.1]);

[muhammad nur adri nawi]

Error in example (line 6)

w_han =hann(M)';

why I got this error?

[KALYAN ACHARJYA]

Error message ?

As I have tried with this also

w_han =hann(M);

No coding error in my case

[muhammad nur adri nawi]

ok ..got it, it seems that my matlab got problem..thank you