Abstract
In this paper we show how wavelets originating from multiresolution analysis of scaleN give rise to certain representations of the Cuntz algebrasO N , and conversely how the wavelets can be recovered from these representations. The representations are given on the Hilbert space\(L^2 (\mathbb{T})\) by (S i ξ) (z)=m i (z)ξ(z N). We characterize the Wold decomposition of such operators. If the operators come from wavelets they are shifts, and this can be used to realize the representation on a certain Hardy space over\(L^2 (\mathbb{T})\). This is used to compare the usual scale-2 theory of wavelets with the scale-N theory. Also some other representations ofO N of the above form called diagonal representations are characterized and classified up to unitary equivalence by a homological invariant.
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Work supproted in part by the U.S. National Science Foundation and the Norwegian Research Council.
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Bratteli, O., Jorgensen, P.E.T. Isometries, shifts, Cuntz algebras and multiresolution wavelet analysis of scaleN . Integr equ oper theory 28, 382–443 (1997). https://doi.org/10.1007/BF01309155
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DOI: https://doi.org/10.1007/BF01309155