Hierarchical frequency grid management for arbitrary response FWL IIR filter design using a genetic algorithm

A new approach of frequency grid management during the design of digital filters is presented. The technique uses a genetic algorithm, for a single-stage design of digital IIR filters with finite wordlength, which performs a two-stage fitness evaluation. The first performed on a coarse frequency grid. Whereas the second being performed on a relatively denser scale. The results obtained indicate a significant reduction in computational overhead.