Title

Phases for dyadic orthonormal wavelets

Authors

Authors

Q. Gu;D. Q. Han

Abbreviated Journal Title

J. Math. Phys.

Keywords

Physics, Mathematical

Abstract

We consider real-valued functions alpha(s) and wavelets psiis an element ofL(2)(R) such that e(ialpha(s))\psi(s)\ is the Fourier transform of a wavelet. Such a function alpha(s) is called an attainable phase for the wavelet psi. It is known that for all multiresolution analysis (MRA) wavelets, the phase function alpha(s)=shape=1/2 s is attainable, and any real function alpha(s) is attainable by any minimally-supported-frequency (MSF) wavelet. Besides this, very little is known in the literature about attainable phases for wavelets. We study the problem of determining functions which are attainable phases for some (non-MSF) wavelets. We prove that there exists a non-MSF wavelet for which there is no attainable "set-wise" linear phase. This answers a basic question about wavelet phases. Although we do not know whether for any irrational number a, as is attainable by some non-MSF wavelets, we show that there exist certain rational numbers a such that as is not attainable by any non-MSF wavelet. We also prove that there exists a large class of rational numbers a such that as is attainable by some non-MSF wavelets. We examine the relationship between different classes of wavelets admitting linear phases. In particular we present an example of a non-MSF wavelet which is not an MRA wavelet but admits linear phase 1/2 s. (C) 2002 American Institute of Physics.

Journal Title

Journal of Mathematical Physics

Volume

43

Issue/Number

5

Publication Date

1-1-2002

Document Type

Article

Language

English

First Page

2690

Last Page

2706

WOS Identifier

WOS:000175145100036

ISSN

0022-2488

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