Efficient Multichannel NLMS Implementation for Acoustic Echo Cancellation

Document type: Journal Articles
Article type: Original article
Peer reviewed: Yes
Full text:
Author(s): Fredric Lindström, Christian Schüldt, Ingvar Claesson
Title: Efficient Multichannel NLMS Implementation for Acoustic Echo Cancellation
Journal: EURASIP Journal on Audio, Speech, and Music Processing
Year: 2007
Volume: 2007
Pagination: Article ID 78439, 6 pages
ISSN: 1687-4714
Publisher: Hindawi Publishing Corporation
Organization: Blekinge Institute of Technology
Department: School of Engineering - Dept. of Signal Processing (Sektionen för teknik – avd. för signalbehandling)
School of Engineering S- 372 25 Ronneby
+46 455 38 50 00
Authors e-mail: fli@bth.se, csc@bth.se
Language: English
Abstract: An acoustic echo cancellation structure with a single loudspeaker and multiple microphones is, from a system identification perspective, generally modelled as a single-input multiple-output system. Such a system thus implies specific echo-path models (adaptive filter) for every loudspeaker to microphone path. Due to the often large dimensionality of the filters, which is required to model rooms with standard reverberation time, the adaptation process can be computationally demanding. This paper presents a selective updating normalized least mean square (NLMS)-based method which reduces complexity to nearly half in practical situations, while showing superior convergence speed performance as compared to conventional complexity reduction schemes. Moreover, the method concentrates the filter adaptation to the filter which is most misadjusted, which is a typically desired feature.
Subject: Signal Processing\General
Note: Open Access Journal doi:10.1155/2007/78439