Open Access Publications from the University of California

## A wavelet "time-shift-detail" decomposition

• Author(s): Levan, N
• Kubrusly, Carlos S
• et al.

## Published Web Location

https://doi.org/10.1016/S0378-4754(03)00037-5
Abstract

\begin{abstract}We show that, with respect to an orthonormal wavelet $\psi(.)\in \L^{2}(\RR),$ any $f(.)\in\L^{2}(\RR)$ is, on the one hand, the sum of its layers of details'' over all time-shifts, and on the other hand, the sum of its layers of details over all scales. The latter is well known and is a consequence of a wandering subspace decomposition of $\L^{2}(\RR)$ which, in turn, resulted from a wavelet Multiresolution Analysis (MRA). The former has not been discussed before. We show that it is a consequence of a decomposition of $\L^{2}(\RR)$ in terms of reducing subspaces of the dilation-by-2 shift operator. \end{abstract}

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