TITLE:
Cosine Modulated Non-Uniform Filter Banks
AUTHORS:
Jyotsna Ogale, Samrat Ashok
KEYWORDS:
Cosine Modulation, Merging, Non-Uniform Filter Bank, Near Perfect Reconstruction
JOURNAL NAME:
Journal of Signal and Information Processing,
Vol.2 No.3,
August
12,
2011
ABSTRACT: Traditional designs for non-uniform filter bank (NUFB) are usually complex; involve complicated nonlinear optimization with a large number of parameters and lack of linear phase ([LP) property. In this paper, we describe a simple design method for multirate near perfect reconstruction (NPR) cosine modulated filter banks with non-uniform frequency spacing and linear phase property that involves optimization of only single parameter. It is derived from the uniform cosine modulated filter bank (CMFB) by merging some relevant band pass filters. The design procedure and the structure of the uniform CMFB are mostly preserved in the non-uniform implementation. Compared to other design methods our method provides very good design and converges very rapidly but the method is applicable, only if the upper band edge frequency of each non-uniform filter is an integral multiple of the bandwidth of the corresponding band. The design examples are presented to show the superiority of the proposed method over existing one.