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High-Speed and Low-Cost Structures 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., Chiba

Lagrange-type variable fractional-delay (VFD) filters are simple and fundamental tools for high-resolution image interpolation. In this paper, we first reveal and theoretically prove the coefficient-symmetry of odd-order Lagrange-type VFD filters, and then exploit the coefficient-symmetry in implementing the VFD filters. We show that the odd-order Lagrange-type VFD filters can be efficiently implemented as the Farrow structure and even-odd structure whose more than half subfilters have symmetric or antisymmetric coefficients, thus the storage cost for the subfilter coefficients can be reduced by 50%, and the number of multiplications required for VFD filtering can also be reduced by 50%, which leads to high-speed signal processing

Published in:

Communications and Information Technologies, 2006. ISCIT '06. International Symposium on

Date of Conference:

Oct. 18 2006-Sept. 20 2006

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