Frames, modular functions for shift-invariant subspaces and FMRA wavelet frames

Gu, Qing; Han, Deguang

doi:10.1090/S0002-9939-04-07601-4

Frames, modular functions for shift-invariant subspaces and FMRA wavelet frames
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by Qing Gu and Deguang Han PDF

Proc. Amer. Math. Soc. 133 (2005), 815-825 Request permission

Abstract:

We introduce the concept of the modular function for a shift-invariant subspace that can be represented by normalized tight frame generators for the shift-invariant subspace and prove that it is independent of the selections of the frame generators for the subspace. We shall apply it to study the connections between the dimension functions of wavelet frames for any expansive integer matrix $A$ and the multiplicity functions for general multiresolution analysis (GMRA). Given a frame mutiresolution analysis (FMRA), we show that the standard construction formula for orthonormal multiresolution analysis wavelets does not yield wavelet frames unless the underlying FMRA is an MRA. A modified explicit construction formula for FMRA wavelet frames is given in terms of the frame scaling functions and the low-pass filters.

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