An optimized design of nonuniform filter bank using variable-combinational window function

Abstract

This paper proposes an optimized tree structure technique for the design of near perfect reconstruction (NPR) non-uniform filterbank. Popular variable window functions like Kaiser, Dolph-Chebyshev (DC) and Parzen-cos6 (nπ/N) (PC6) are used in the design of prototype filter. The NPR condition, results the distortion at the output. Therefore a linear iterative optimization technique is used to minimize the distortion. The proposed algorithm provides lowest value of distortion parameter than earlier reported publications with minimum computation overhead.