## Document Type

Article

## Publication Date

2015

## Abstract

Using the system theory notion of state-space realization of matrix-valued rational functions, we describe the Ruelle operator associated with wavelet filters. The resulting realization of infinite products of rational functions have the following four features: 1) It is defined in an infinite-dimensional complex domain. 2) Starting with a realization of a single rational matrix-function M, we show that a resulting infinite product realization obtained from M takes the form of an (infinitedimensional) Toeplitz operator with the symbol that is a reflection of the initial realization for M. 3) Starting with a subclass of rational matrix functions, including scalar-valued ones corresponding to low-pass wavelet filters, we obtain the corresponding infinite products that realize the Fourier transforms of generators of L2(R) wavelets. 4) We use both the realizations for M and the corresponding infinite product to obtain a matrix representation of the Ruelle-transfer operators used in wavelet theory. By “matrix representation” we refer to the slanted (and sparse) matrix which realizes the Ruelle-transfer operator under consideration.

## Recommended Citation

D. Alpay, P. Jorgensen, and I. Lewkowicz. Realizations of Infinite Products, Ruelle Operators and Wavelet Filters. Journal of Fourier Analysis and Applications, vol. 21 (2015), 1034-1052.

## Peer Reviewed

1

## Copyright

Springer

#### Included in

Algebra Commons, Discrete Mathematics and Combinatorics Commons, Other Mathematics Commons

## Comments

This is a pre-copy-editing, author-produced PDF of an article accepted for publication in

Journal of Fourier Analysis and Applications, volume 21, in 2015 following peer review. The final publication is available at Springer via DOI: 10.1007/s00041-015-9396-z