How can i plot zero and its frequency responsE
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How can i plot zero and its frequency response
b = conv([1 -1.08 0.3132],[1 -1.315 0.6182])
c =b;
a = [0 0 0 0.0686]
[z,p,K] = tf2zp(c,a);
figure(1)
zplane(a,c)
xlabel('Re(z)');
ylabel('Im(z)');
title('POLE DIAGRAM OF THE TRANSFER FUNCTION H(z)')
w = -pi:(pi/500):pi;
H = freqz(a,c,w);
figure(2)
subplot(2,1,1);
plot(w, abs(H),'r','LineWidth',2);
grid on;
xlabel('frequency in pi units');
ylabel('Magntiude');
title('MAGNITUDE FREQUENCY RESPONSE OF THE TRANSFER FUNCTION H(z)')
subplot(2,1,2);
plot(w, angle(H),'r', 'LineWidth',2);
grid on;
xlabel('frequency in pi units');
ylabel('phase');
1 Comment
Accepted Answer
Azzi Abdelmalek
on 21 Mar 2014
Edited: Azzi Abdelmalek
on 21 Mar 2014
The numerator should be
a = 0.0686
To find poles and zeros
[z,p,K] = tf2zp(a,c); % not tf2zp(c,a)
Add
b = conv([1 -1.08 0.3132],[1 -1.315 0.6182])
c =b;
a = 0.0686
[z,p,K] = tf2zp(a,c);
figure(1)
zplane(a,c)
xlabel('Re(z)');
ylabel('Im(z)');
title('POLE DIAGRAM OF THE TRANSFER FUNCTION H(z)')
w = -pi:(pi/500):pi;
H = freqz(a,c,w);
figure(2)
subplot(2,1,1);
plot(w, abs(H),'r','LineWidth',2);
grid on;
xlabel('frequency in pi units');
ylabel('Magntiude');
title('MAGNITUDE FREQUENCY RESPONSE OF THE TRANSFER FUNCTION H(z)')
subplot(2,1,2);
plot(w, angle(H),'r', 'LineWidth',2);
grid on;
xlabel('frequency in pi units');
ylabel('phase');
3 Comments
Azzi Abdelmalek
on 21 Mar 2014
Paul commented
Hi Azzi Abdelmalek Can you please help me with this one.I'm new to MAT LAB.
Azzi Abdelmalek
on 21 Mar 2014
The frequency interval is not well chosen. It should be
w = -2*pi:(pi/500):2*pi
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