Current state and future directions of multirate filter banks and their applications

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Abstract

This paper provides an overview of the basic concepts, current state and future directions of uniform and nonuniform multirate filter banks and their applications. Research in the areas of multidimensional filter banks, and wavelet transforms, as a direct extension to the topic is still proceeding at a rapid rate. Different design techniques and algorithms that are currently of interest are investigated from hardware complexity and reconstructed signals' quality points of view. Important similarities and differences between different filters categories are noted, which lead to a discussion of important issues that need to be resolved. Distortions and quantization effects present in the filter banks are reviewed and some solutions for controlling different types of distortions are introduced. The problem of designing QMF banks that can provide good frequency resolution while allowing for exact or near perfect reconstruction of the signal is quite challenging, because so many dissimilar types of distortion must be minimized and/or eliminated in the same design context. Recently, the perfect reconstruction cosine-modulated filter bank and filter banks with block sampling have emerged as an attractive choice of filter bank with respect to implementation complexities and design cost. New trends and future directions including selective multirate filter banks, filter banks with nonuniform decimation ratio, filter banks with discrete coefficients, multidimensional filter banks, nonlinear filter banks and data dependent decompositions are presented. Finally, some selected applications of multirate filter banks are described; namely transmultiplexers, speech and image coding, analog voice privacy systems and wavelets based signal and image compression.

Section snippets

Prof. Mohammed Abo-Zahhad received his B.S.E.E. degree and his M.S.E.E. degree in electrical engineering from Assiut University, Egypt, in 1979 and 1983, respectively. He received his Ph.D. degree from the University of Kent at Canterbury, UK and Assiut University, in 1988 under the channel system. He has worked at the Faculty of Engineering, Assiut University as a Demonstrator (1979), an Assistant Lecturer (1984), an Assistant Professor (1988) and as an Associate Professor (1994). From 1990 to

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    Prof. Mohammed Abo-Zahhad received his B.S.E.E. degree and his M.S.E.E. degree in electrical engineering from Assiut University, Egypt, in 1979 and 1983, respectively. He received his Ph.D. degree from the University of Kent at Canterbury, UK and Assiut University, in 1988 under the channel system. He has worked at the Faculty of Engineering, Assiut University as a Demonstrator (1979), an Assistant Lecturer (1984), an Assistant Professor (1988) and as an Associate Professor (1994). From 1990 to 1992, Dr. Abo-Zahhad joined the Technical University of Budapest, Hungary, as a research fellow, where his research activities were initially concerned with the design of optimal digital filters and later expanded to include wave-digital filters. Since 1996, he has been working at the Electronics Engineering Department, Hijjawi Faculty for Engineering Technology, Yarmouk University, Jordan, as a Professor of Electronics and Communication Engineering. His research interests include design and implementation of switched capacitor and digital filters, multirate and medical signal processing, data compression, wavelet-transforms, and electronic systems. He authored over 70 published articles in the above fields and he received the award of Distinguished Researcher from Assiut University for his scientific achievements in Electronics and Communication Engineering (1996). He served as a Director of Assiut University Computer Center (1988–1989). Since 1990 Dr. Abo-Zahhad has been an IEEE member and a member in the European Society of Circuit Theory and Applications (ESCTA). Now, he is a Senior IEEE Member.

    1

    The author is on leave from the Electrical and Electronics Engineering Department, Faculty of Engineering, Assiut University, Assiut, Egypt. E-mail: [email protected].

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