Abstract
We show that any two functions which are real-valued, bounded, compactly supported and whose integer translates each form a partition of unity lead to a pair of windows generating dual Gabor frames for \(L^{2}(\mathbb {R})\). In particular we show that any such functions have families of dual windows where each member may be written as a linear combination of integer translates of any B-spline. We introduce functions of Hilbert-Schmidt type along with a new method which allows us to associate to certain such functions finite families of recursively defined dual windows of arbitrary smoothness. As a special case we show that any exponential B-spline has finite families of dual windows, where each member may be conveniently written as a linear combination of another exponential B-spline. Unlike results known from the literature we avoid the usual need for the partition of unity constraint in this case.
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Communicated by: L. L. Schumaker
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Christiansen, L.H. Pairs of dual Gabor frames generated by functions of Hilbert-Schmidt type. Adv Comput Math 41, 1101–1118 (2015). https://doi.org/10.1007/s10444-015-9402-7
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DOI: https://doi.org/10.1007/s10444-015-9402-7