how to find H(e j(ω π) ) if you know H(e j(ω), you found out H(e j(ω) by using freqz
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how to find H(e j(ω +π) ) if you know H(e j(ω), you found out H(e j(ω) by using freqz
For instance, you have H(e(jw)) by having an array of h, and then you find out h(e^(jw)) by using [h,w]=freqz(h).But now I want to know how to find H(e^(jw+pi)). Thank you!
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Dimitris Kalogiros
2019년 10월 13일
You have to restate with more details.
What exactly do you want to find out ?
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Dimitris Kalogiros
2019년 10월 14일
Keep in mind that,
is a periodic function of ω , with period
.
![](https://www.mathworks.com/matlabcentral/answers/uploaded_files/242535/image.png)
![](https://www.mathworks.com/matlabcentral/answers/uploaded_files/242536/image.png)
Have a look at the following figure. Focus on the "blue" and the "green" graphs, where the magnitude of the signals is depicted. I think that you have to use freqz() with the parameter 'whole', in order to calculate the right green graph into the interval [0 , 2pi] .
![tranforms.jpg](https://www.mathworks.com/matlabcentral/answers/uploaded_files/242537/tranforms.jpeg)
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