Abstract
For sufficiently small translation parameters, we prove that any bandlimited function ψ, for which the dilations of its Fourier transform form a partition of unity, generates a wavelet frame with a dual frame also having the wavelet structure. This dual frame is generated by a finite linear combination of dilations of ψ with explicitly given coefficients. The result allows a simple construction procedure for pairs of dual wavelet frames whose generators have compact support in the Fourier domain and desired time localization. The construction is based on characterizing equations for dual wavelet frames and relies on a technical condition. We exhibit a general class of function satisfying this condition; in particular, we construct piecewise polynomial functions satisfying the condition.
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Communicated by Qiyu Sun.
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Lemvig, J. Constructing pairs of dual bandlimited framelets with desired time localization. Adv Comput Math 30, 231–247 (2009). https://doi.org/10.1007/s10444-008-9066-7
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DOI: https://doi.org/10.1007/s10444-008-9066-7