FIR Digital Filter Banks for Speech Analysis

In using filter banks for processing speech signals, it is often important that the sum of the individual frequency responses of the bandpass filters (composite response) be flat with linear phase. This paper presents a technique for achieving flat composite response using linear-phase fir digital filters. The design method is based on some special properties of fir filters designed by the windowing method. Excellent response characteristics can be achieved with complete flexibility in choosing the center frequencies and bandwidths of the individual filters.