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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Anh Dao 2019년 10월 13일
답변: Dimitris Kalogiros 2019년 10월 14일
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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Anh Dao 2019년 10월 13일
I restated it with more details! Thank you!

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Dimitris Kalogiros 2019년 10월 14일
Keep in mind that, is a periodic function of ω , with period .
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] .

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