A Simple Ladder Realization of Maximally Flat Allpass Fractional Delay Filters
Shunsuke Koshita, Masahide Abe, Masayuki Kawamata · IEEE Transactions on Circuits & Systems II Express Briefs · 2014
This brief proposes a new ladder structure for the Thiran fractional delay filter (i.e., maximally flat allpass fractional delay filter given by the Thiran approximation). The proposed ladder structure is based on a continued fraction representation. Although there exists a similar approach that was proposed by Tassart and Depalle, their structure is not realizable because of delay-free loops. On the other hand, we show that the proposed method avoids generating delay-free loops and thus successfully yields a realizable ladder structure for the Thiran fractional delay filter in a very simple form.