tailieunhanh - Báo cáo hóa học: "Research Article A Novel Approach to the Design of Oversampling Low-Delay Complex-Modulated Filter Bank Pairs"

Tuyển tập báo cáo các nghiên cứu khoa học quốc tế ngành hóa học dành cho các bạn yêu hóa học tham khảo đề tài: Research Article A Novel Approach to the Design of Oversampling Low-Delay Complex-Modulated Filter Bank Pairs | Hindawi Publishing Corporation EURASIP Journal on Advances in Signal Processing Volume 2009 Article ID 692861 13 pages doi 2009 692861 Research Article A Novel Approach to the Design of Oversampling Low-Delay Complex-Modulated Filter Bank Pairs Thomas Kurbiel EURASIP Member Heinz G. Gockler EURASIP Member and Daniel Alfsmann EURASIP Member Digital Signal Processing Group Ruhr-Universitat Bochum 44780 Bochum Germany Correspondence should be addressed to Thomas Kurbiel kurbiel@ Received 15 December 2008 Revised 5 June 2009 Accepted 9 September 2009 Recommended by Sven Nordholm In this contribution we present a method to design prototype filters of oversampling uniform complex-modulated FIR filter bank pairs. Especially we present a noniterative two-step procedure i design of analysis prototype filter with minimum group delay and approximately linear-phase frequency response in the passband and the transition band and ii Design of synthesis prototype filter such that the filter bank pairs distortion function approximates a linear-phase allpass function. Both aliasing and imaging are controlled by introducing sophisticated stopband constraints in both steps. Moreover we investigate the delay properties of oversampling uniform complex-modulated FIR filter bank pairs in order to achieve the lowest possible filter bank delay. An illustrative design example demonstrates the potential of the design approach. Copyright 2009 Thomas Kurbiel et al. This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use distribution and reproduction in any medium provided the original work is properly cited. 1. Introduction A digital filter bank pair FBP is represented by a cascade connection of an analysis filter bank AFB for signal decomposition and a synthesis filter bank SFB for signal reconstruction. In this contribution we are exclusively interested in FBP that are most efficient in terms of i .

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