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Implementation of linear-phase FIR nearly perfect reconstruction cosine-modulated filterbanks utilizing the coefficient symmetry

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Implementation of linear-phase FIR nearly perfect reconstruction cosine-modulated filterbanks utilizing the coefficient symmetry

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Title: Implementation of linear-phase FIR nearly perfect reconstruction cosine-modulated filterbanks utilizing the coefficient symmetry
Author: Bregovic, Robert; Yu, Ya Jun; Viholainen, Ari; Lim, Yong Ching
Copyright year: 2010
Abstract: The analysis and synthesis parts of a cosine-modulated -channel filterbank (FB) contain two sections, a modulation block and a prototype filter implemented in a polyphase structure. Although, in many cases, a linear-phase prototype filter is used, the coefficient symmetry of this filter is not utilized when using the existing polyphase structure. In this paper, a method is proposed for implementing a linear-phase prototype filter building a nearly perfect reconstruction cosine-modulated FB in such a way that it enables one to partially utilize the coefficient symmetry, thereby reducing the number of required multiplications in the implementation. The proposed method can be applied for implementing FBs with an arbitrary filter order and number of channels. Moreover, it is shown that, in all cases under consideration, the cosine-modulation part of the FB can be implemented by using a fast discrete cosine transform. The efficiency of the proposed implementation is evaluated by means of examples.
Subject: DRNTU::Engineering::Electrical and electronic engineering.
Type: Journal Article
Series/ Journal Title: IEEE transactions on circuits and systems—I
School: School of Electrical and Electronic Engineering
Rights: © 2010 IEEE. Personal use of this material is permitted. However, permission to reprint/republish this material for advertising or promotional purposes or for creating new collective works for resale or redistribution to servers or lists, or to reuse any copyrighted component of this work in other works must be obtained from the IEEE. This material is presented to ensure timely dissemination of scholarly and technical work. Copyright and all rights therein are retained by authors or by other copyright holders. All persons copying this information are expected to adhere to the terms and constraints invoked by each author's copyright. In most cases, these works may not be reposted without the explicit permission of the copyright holder.
Version: Published version

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