MATLAB Answers

How does modwpt details provide zero phase filtering ?

HIMANSHU SANDHIBIGRAHA 님이 질문을 제출함. 17 May 2018
최근 활동 Wayne King 님이 답변함. 28 May 2018
I have used MODWPT for getting the wavelet coefficients for a given signal. But the resulting coefficients are shifted by some phase difference. Rather than that by using MODWPT details I am getting zero phase filtering. How does this result in zero phase difference? What are the changes in filter coefficients inorder to get this result?

  댓글 수: 0

로그인 to comment.

답변 수: 1

Wayne King 님의 답변 28 May 2018

MODWPTDETAILS actually projects the signal onto the various wavelet packet subspaces, that is what provides the zero-phase filtering because you are using not only the analysis filters but also the synthesis filters. MODWPT does have a time-aligned option that will provide an approximation to this using just the analysis filters (coefficients), but it is not exact like MODWPTDETAILS. The MODWPT with time-aligned does have the advantage of still conserving the signal energy though. The similarity between MODWPT and MODWPTDETAILS is analogous to MODWT and MODWTMRA.

  댓글 수: 0

로그인 to comment.



Translated by