Design of nonuniform cosine-modulated filter-banks with the perfect-reconstruction property and arbitrary filter lengths
Xie Xuemei · Progress in Natural Science Materials International · 2007
In this paper' a method is proposed to construct recombination nonuniform cosine-modulated filter banks (CMFBs) with a perfect-reconstruction property and with arbitrary filter lengths. In this filter bank (FB) structure, certain channels of an original M-channel uniform FB are merged by a set of transmultiplexers (TMUXs), yielding nonuniform outputs, and the length restrictions on the original CMPB and the recombination TMUKs are avoided, allong them to have arbifrary filter lengths. By imposing certain improved matching conditions on the protote filters, nonuniform FBs with arbitrary filter lengths and with good properties can be obtained. As a result, the flexibility of selecting modulation types and filter lengths is greatly increased in the design of recombination nonuniform CMFBs. Another benefit due to the flexibility is that the system delay can be reduced.