Design of Oversampled Uniform DFT Filter Banks with Reduced Inband Aliasing and Delay Constraints

Document type: Conference Papers
Peer reviewed: Yes
Full text:
Author(s): Nedelko Grbic, Jan Mark de Haan, Sven Nordholm, Ingvar Claesson
Title: Design of Oversampled Uniform DFT Filter Banks with Reduced Inband Aliasing and Delay Constraints
Translated title: Filterbank design
Conference name: in Proc. of IEEE Sixth International Symposium on Signal Processing and its Applications, ISSPA 2001
Year: 2001
Pagination: 104-7 vol.1
ISBN: 0-7803-6703-0
Publisher: IEEE
City: Kuala Lumpur, Malaysia
ISI number: 000175608600027
Organization: Blekinge Institute of Technology
Department: Department of Telecommunications and Signal Processing (Institutionen för telekommunikation och signalbehandling)
Department of Telecommunications and Signal Processing S-372 25 Ronneby
+46 455 38 50 00
Authors e-mail: ngr@bth.se, jmd@bth.se, sven@atri.curtin.edu.au, icl@bth.se
Language: English
Abstract: Subband adaptive filters have been proposed to avoid the drawbacks of slow convergence and high computational complexity associated with time domain adaptive filters. Subband processing introduces transmission delays caused by the filter bank and signal degradations due to aliasing effects. One efficient way to reduce the aliasing effects is to allow a higher sample rate than critically needed in the subbands and thus reduce subband signal degradation. We suggest a design method, for a uniform DFT filter bank with any over sampling factor, where the total filter bank group delay may be specified, and where the aliasing and magnitude/phase distortions are minimized.
Summary in Swedish: En ny metod för design av översamplade filterbankar presenteras. Metoden minimerar vikningstermer inuti de olika subbanden. Dessa termer orsakar avvikelser från optimala lösningar varför det är önskvärt att minimera effekten av dessa.
Subject: Signal Processing\Filter Design
Signal Processing\Speech Enhancement
Keywords: Subband, filterbank design, Uniform DFT, inband aliasing
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