Structure Transformation for Odd-Order Lagrange-Type Variable Fractional-Delay Filters
Tian–Bo Deng · ITC-CSCC :International Technical Conference on Circuits Systems, Computers and Communications · 2007
Lagrange-type variable fractional-delay (VFD) digital filters can be directly implemented as the well-known Farrow structure, but the subfilter coefficients do not have symmetric or anti-symmetric coefficients. This paper presents a method for transforming a causal odd-order Lagrange-type VFD filter into a new one whose more than half subfilters have symmetric or anti-symmetric coefficients, which leads to an ef-ficient implementation that reduces the computational complexity and saves hardware cost for storing independent sub-filter coefficients.