An Alternative Approach for Generating-Linear-Phase FIR Filters from IIR-Like Filter-Blocks in Cascade
P. Arian, T. Saramäki, Adly T. Fam · 2005
The structure composed of a stable IIR filter G(z) in cascade with its anticausal counterpart G(z/sup -1/) is equivalent to a zero-phase IIR filter. Truncating the impulse responses of G(z) and G(z/sup -1/), followed by a subsequent delay transforms the structure into a linear-phase FIR. A design technique to implement the above scheme has already been proposed by the authors. This paper takes a new approach to the implementation problem by introducing a new truncation scheme, and illustrates its superiority for certain design specifications.