Cosine Modulated Structures for Rational Multirate Filter Banks.
Frank Kurth · 1999
We propose a new structure for rational multirate filter banks (FBs) using cosine modulation. More precisely, the proposed structure is intended to realize a critically sampled subband analysis where the L subbands are allowed to have bandwidths given by integer ratios p i /q i , provided that i=1 p i /q i = 1. We show that within our construction there exist FIR solutions allowing perfect reconstruction (PR). As opposed to previous structures the proposed method is applicable to arbitrary combinations of rational bandwidth ratios and suitable for a wide range of applications.