Group delay equalization of discrete-time filters

It is known that approximate linear phase frequency response may satisfy system requirements in many applications. In such cases, IIR filters could replace with advantages what would otherwise be expensive linear phase FIR filters. For this purpose we developed a methodology for initially allocating poles and zeros of a group delay equalizer and then applying it to a computer aided optimization routine. Results showing its efficacy in providing fast convergence even in highly non-linear phase response equalizations are shown.