Design of fractional delay filters using least square error and Fourier series

摘要

This paper presents two new methods for designing finite impulse response (FIR) fractional delay filters (FD). These methods, firstly, sample from basic delay system Z/sup -D/ - when D is not integer - in the frequency domain, and then find a polynomial in integer power of Z using least square fittings approximation and Fourier series expansion. Examples are given to illustrate the accuracy of the techniques.