An Improved and Simplified Approach for Designing Cosine Modulated Filter Bank Using Window Technique

Authors:
A. Kumar;G. K. Singh;B. Kuldeep
Affiliations:
Indian Institute of Information Technology Design and Manufacturing Jabalpur, Jabalpur, India 482005;Department of Electrical Engineering, Indian Institute of Technology Roorkee, Uttrakhand, India 247667;Indian Institute of Information Technology Design and Manufacturing Jabalpur, Jabalpur, India 482005
Venue:
Journal of Mathematical Modelling and Algorithms
Year:
2011

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Abstract

An improved and simplified approach is presented for design of nearly perfect reconstructed cosine-modulated (CM) filter banks with prescribed stopband attenuation and channel overlapping. The method employs Kaiser window technique to design the prototype filter for filter banks with the novelty of exploiting spline functions in the transition band of the ideal filter instead of using the conventional brick-wall filter based on linear optimization of filter coefficients such that their value at frequency (驴驴=驴驴/2M) is 0.707. The simulation results illustrate the proposed method and its improvement over other existing methods in terms of amplitude distortion (e am ), number of iterations (NOI), aliasing distortion (e a ) and computation time (CPU time).