An algorithm for the optimization of adjustable fractional-delay all-pass filters
J. Yli-Kaakinen and T. Saramäki, "An algorithm for the optimization of adjustable fractional-delay all-pass filters," in Proc. IEEE Int. Symp. Circuits Syst., Vancouver, Canada, May 23–26 2004, pp. 153–156.
Digital Object Identifier: 10.1109/ISCAS.2004.1328706Full text available as: PDF (414 kB) – Requires Adobe Acrobat Reader or other PDF viewer.
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Abstract
This paper considers optimizing adjustable fractional-delay (FD) all-pass filters in the minimax sense. A filter structure proposed by Makundi, Laakso, and Välimäki and referred to as an all-pass gathering structure is employed. The optimization is performed in two basic steps. First, an initial filter is generated using a simple design scheme. Second, this filter is used as a start-up solution for further optimization being carried out by an efficient constrained nonlinear optimization algorithm. An example is included for illustrating the efficiency of the proposed design scheme. In addition, the performance and the complexity of the adjustable FD all-pass filters are compared with those of the adjustable FD finite impulse-response filters implemented using the modified Farrow structure proposed by Vesma and Saramäki. This comparison shows that both the number of multipliers and the number of adders for the resulting all-pass filters are less than 50 percent compared with their optimized FIR counterparts.BibTeX
@Article{ylikaakiISCAS04b
author = {J. Yli-Kaakinen and T. Saram{\"a}ki}
title = {An
algorithm for the optimization of adjustable
fractional-delay all-pass filters},
booktitle = {Proc. IEEE Int. Symp. Circuits Syst.},
year = 2004,
pages = {153--156},
address = {Vancouver, Canada},
month = {May} # "~23--26"
}
Citing Documents
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