WLS design of variable fractional-delay FIR filters using coefficient relationship
IEEE Transactions on Circuits and Systems II: Express Briefs
Robust structure transformation for causal Lagrange-type variable fractional-delay filters
IEEE Transactions on Circuits and Systems Part I: Regular Papers - Special section on 2008 custom integrated circuits conference (CICC 2008)
Generalized WLS method for designing all-pass variable fractional-delay digital filters
IEEE Transactions on Circuits and Systems Part I: Regular Papers
Minimax design of low-complexity allpass variable fractional-delay digital filters
IEEE Transactions on Circuits and Systems Part I: Regular Papers
IEEE Transactions on Circuits and Systems Part I: Regular Papers
Weighted-Least-Squares Design of Variable Fractional-Delay FIR Filters Using Coefficient Symmetry
IEEE Transactions on Signal Processing
IEEE Transactions on Signal Processing
SVD-based design and new structures for variable fractional-delay digital filters
IEEE Transactions on Signal Processing
Design of Allpass Variable Fractional Delay Filter
IEEE Transactions on Signal Processing
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Although the coefficient-relation of the even-order sub-filters in the Farrow structure has been revealed and adopted in the weighted-least-squares (WLS) design of even-order finite-impulse-response (FIR) variable fractional-delay (VFD) digital filters in the literature, it has never been exploited in implementing low-complexity VFD filters. This paper aims to(i)propose a low-complexity implementation structure through exploiting the coefficient-relation such that the coefficient-relation is not only utilized in the design process, but also utilized in the low-complexity implementation; (ii)formulate the minimax design of an even-order VFD filter through exploiting the coefficient-relation; (iii)propose a new two-stage scheme called increase-then-decrease scheme for optimizing the sub-filter orders so as to minimize the VFD digital filter complexity. With the above three advances, an even-order VFD filter can not only be designed and but also be implemented efficiently by exploiting the coefficient-relation. We will use a design example to illustrate the low complexity and high design accuracy.