ON DESIGNING A WIDEBAND FRACTIONAL DELAY FILTER USING THE FARROW APPROACH (WedPmPO1)

Author(s) : Ewa Hermanowicz (Gdansk University of Technology, Poland)

Abstract : In this paper the problem of designing a wideband FIR fractional delay filter using the Farrow approach is considered. A two-stage design with a half-band linear-phase prefilter optimal in the Chebyshev sense and a short maximally flat Lagrangian fractional delay filter in the Farrow structure is proposed. It offers an economic implementation with the number of multiplications smaller than for one-stage approach used hitherto, provided that the prefilter is a Nyquist filter. A novel, accurate method of computing the coefficients of Farrow subfilters is introduced based on symbolic designing of k-th degree differentiators. The proposed filter is intended for applications with variable fractional delay value.

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