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Plotting amplitude response and phase

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Dennis Weimer
Dennis Weimer on 5 Mar 2020
Commented: Dennis Weimer on 5 Mar 2020
Hi,
I want to plot the amplitude and the phase response of the following system:
I have the following code, but need help with the plots.
% Parameters
fs = 2000;
dt = 1/fs;
r = 0.99;
w0 = 700;
% Transfer function
numerator = [1,-2*cos(700),1];
denominator = [1,-2*cos(700)*r,r^2];
sys = tf(numerator,denominator,dt,'Variable','z^-1')

Answers (1)

Arvind Sathyanarayanan
Arvind Sathyanarayanan on 5 Mar 2020
You can use the bode command to get the magnitude and phase response. Try:
bode(sys);
  1 Comment
Dennis Weimer
Dennis Weimer on 5 Mar 2020
This is working, but the plot doesn't fit to the following sketch.
Is there a possibbility, to change the scale, that it fits?

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