Design of Hilbert transformers by multiple use of same subfilter

A method is proposed for the design of linear-phase FIR Hilbert transformers as a tapped cascaded interconnection of identical FIR subfilters. With the proposed method, the design of FIR Hilbert transformers can be determined by the prototype filter and subfilter through transformation; thus it has potential for VLSI realisation. It is shown that the number of distinct multipliers required by the proposed method is much less than that designed by direct-form minimax methods.