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Symmetry Development for Implementing Odd-Order Lagrange-Type Variable Fractional-Delay Filters

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1 Author(s)
Tian-Bo Deng ; Dept. of Inf. Sci., Toho Univ., Funabashi

The authors' previous work has derived an explicit formula for computing the coefficients of arbitrary-order Lagrange-type variable fractional-delay (VFD) digital filter in a closed-form. This paper develops new coefficient symmetry for efficiently implementing odd-order Lagrange-type VFD filters such that an odd-order Lagrange-type VFD filter can be implemented as the Farrow structure and more efficient even-odd structure whose all subfilters have either symmetric or anti-symmetric coefficients. This symmetry exploitation not only saves the storage for VFD filter coefficients and but also reduces the number of multiplications required in VFD filtering by 50%, which speeds up the VFD filtering process

Published in:

Circuits and Systems, 2006. APCCAS 2006. IEEE Asia Pacific Conference on

Date of Conference:

4-7 Dec. 2006