Design of Variable Fractional Delay Filter Using DFT Interpolation

Abstract

In this paper, design of variable fractional delay filter is investigated. DFT Interpolation method is utilized, with suitable index mapping to design a VFD FIR filter. Design examples are demonstrated to evaluate the effectiveness of the designed filter with the help of magnitude, group delay & relative error. Results of designed VFD FIR Filter are within acceptable limits over a wide range of frequency. Finally, the realization of VFD FIR filter is proposed.