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Variable Fractional Delay Filter Design Using a Symmetric Window

Abstrakt

In this paper a numerically efficient method for designing a nearly optimal variable fractional delay (VFD) filter based on a simple and well-known window method is presented. In the proposed method a single window extracted from the optimal filter with fixed fractional delay (FD) is divided into even and odd part. Subsequently, the odd part is discarded and symmetric even part of the extracted window is used to design a family of nearly optimal filters with varying FD. In addition to window extraction, the proposed approach requires filter gain correction which is dependent on the desired FD. Optimum values of the gain correction factor as well as the extracted window can be computed beforehand, which allows us to design a nearly optimal FD filter with arbitrary FD at low numerical costs during runtime. On the basis of the proposed filter design method, the universal structure of VFD filter allowing for change of filter type and length has been proposed. In the paper, three FD filter optimality criteria are considered, which are maximal flatness, Chebyshev (minimax), and least squares.

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Informacje szczegółowe

Kategoria:
Publikacja w czasopiśmie
Typ:
artykuł w czasopiśmie wyróżnionym w JCR
Opublikowano w:
CIRCUITS SYSTEMS AND SIGNAL PROCESSING nr 33, wydanie 10, strony 3223 - 3250,
ISSN: 0278-081X
Język:
angielski
Rok wydania:
2014
Opis bibliograficzny:
Blok M., Sac M.: Variable Fractional Delay Filter Design Using a Symmetric Window// CIRCUITS SYSTEMS AND SIGNAL PROCESSING. -Vol. 33, iss. 10 (2014), s.3223-3250
DOI:
Cyfrowy identyfikator dokumentu elektronicznego (otwiera się w nowej karcie) 10.1007/s00034-014-9803-8
Weryfikacja:
Politechnika Gdańska

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