Design of fractional delay IIR filters using signal modeling approach

In this paper, the Prony´s signal modeling approach is used to design fractional delay (FD) infinite impulse response (IIR) filters. This approach utilizes the least mean square error technique in indirect way to model the FD finite impulse response (FIR) filters into the lower order FD IIR filters. This modeling approach is the combination of direct least square method and the Pade´s signal modeling method. Further, the design examples are also considered to observe the effectiveness of proposed FD IIR filters. In last, the stability of designed FD IIR filters is confirmed by showing the locations of poles in pole-zero plots.