An Analytical Design Procedure For Bireciprocal Lattice Wave Digital Filters With Approximate Linear Phase

AbstractA simple analytic design procedure for bireciprocal lattice wave digital filters (bireciprocal LWDFs) is presented with approximate linear phase. The design is started by replacing the odd order all-pass filter branch in the bireciprocal LWDF with a pure delay, leaving the other branch as an all-pass even function of z -2. Analytic design procedure is then formulated. Several design examples using such procedure are given for verifications.Keywords: Bireciprocal LWDFs, All-pass sections, Half-band filters, Approximate linear phase.