How to plot frequency response at discrete time?

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I want to plot a frequency response ( z-transform)
How can I plot this graph?
Before asking to you, I tried to solve it by myself with the following code, but failed.
for example) H(z) = 1 + 0.5 exp(j*pi/4) * z^-1 ( H(e^jw) = 1+0.5exp(j*(pi/4-w)) )
>> t = linspace(-pi,pi);
>> x = 1+0.5*exp(j*(pi/4-t));
>> figure(1); plot(t,real(x)); grid on;

Answers (1)

Mahesh Taparia
Mahesh Taparia on 4 Jun 2021
Hi
You can use freqz function to plot frequency response at discrete time. You can refer this example to plot the response of your filter.
Hope it will help!

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