DESIGN OF BIORTHOGONAL FIR LINEAR-PHASE FILTER BANKS WITH STRUCTURALLY PERFECT RECONSTRUCTION

In the design of two channel perfect reconstruction filter banks, most of the conventional methods optimize the frequency response of each f ilter to meet the perfect reconstruction condition. However, quantizat ion of the filter coefficients results in some errors in the frequency response, so it is not guaranteed that the perfect reconstruction con dition is still satisfied. In this paper, we present a new method for designing biorthogonal FIR linear phase filter banks with structurally perfect reconstruction. From the perfect reconstruction condition, we first describe a class of structurally perfect reconstruction impleme ntations. Since the proposed filter banks structurally satisfy the per fect reconstruction condition, the design problem becomes the magnitud e approximation of the analysis or synthesis filters. Design of these filters can be reduced to the design of half-band filters. We then giv e a new method to design FIR linear phase half-band filters with arbit rary flatness. Therefore, the proposed filter banks can be designed ea sily by using the proposed method. Additionally, the magnitude respons es of the low- and high-pass filters can be arbitrarily controlled by using two different half-band filters. (C) 1998 Scripta Technica.