A design method for cosine-modulated filter banks using weighted constrained-least-squares filters

Authors:
Stuart W. A. Bergen
Affiliations:
Department of Electrical and Computer Engineering, University of Victoria, P.O. Box 3055 STN CSC, Victoria, BC V8W 3P6, Canada
Venue:
Digital Signal Processing
Year:
2008

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Abstract

A method for designing M-channel cosine-modulated filter banks with prescribed passband ripple, stopband attenuation, and channel overlap is proposed. The method employs the weighted constrained-least-squares technique for the prototype filter design and is based on the minimization of a one-dimensional objective function. The use of two objective functions is investigated and recommendations are made. When compared with other methods, the proposed method reduces reconstruction errors associated with the filter bank.