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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
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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