Wideband fractional delay filter design based on interlaced sampling method

In this paper, the design of wideband fractional delay filter is investigated. First, the reconstruction formula of interlaced sampling method is applied to design wideband fractional delay filter by using index substitution and window method. The filter coefficients are easily computed because closed-form design is obtained. Then, the weighted least squares method is used to design wideband fractional delay filters. Finally, numerical examples are demonstrated to show that the proposed method has smaller design error than the conventional fractional delay filter without using the interlaced sampling scheme.