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

조회 수: 7 (최근 30일)

Anh Dao 2019년 10월 13일

0
링크

이 질문에 대한 바로 가기 링크

https://kr.mathworks.com/matlabcentral/answers/485010-how-to-find-h-e-j-if-you-know-h-e-j-you-found-out-h-e-j-by-using-freqz

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!

댓글 수: 2
없음 표시없음 숨기기

Dimitris Kalogiros 2019년 10월 13일

You have to restate with more details.

What exactly do you want to find out ?

Anh Dao 2019년 10월 13일

I restated it with more details! Thank you!

댓글을 달려면 로그인하십시오.

이 질문에 답변하려면 로그인하십시오.

답변 (1개)

Dimitris Kalogiros 2019년 10월 14일

0
링크

이 답변에 대한 바로 가기 링크

https://kr.mathworks.com/matlabcentral/answers/485010-how-to-find-h-e-j-if-you-know-h-e-j-you-found-out-h-e-j-by-using-freqz#answer_396233

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] .