Acoustic Echo Cancellation Employing Delayless Subband Adaptive Filters

Document type: Conference Papers
Peer reviewed: Yes
Full text:
Author(s): Jörgen Nordberg, Mattias Dahl, Ingvar Claesson, Sven Nordholm, Sven Nordebo
Title: Acoustic Echo Cancellation Employing Delayless Subband Adaptive Filters
Conference name: Proceedings of the 1996 SNRV and NUTEK Conference on Radio Sciences and Telecommunications in Luleå and Kiruna June 3-6, 1996 / RVK 96
Year: 1996
ISBN: 91-630-4455-2
Publisher: Luleå Univ. of Technology (Tekniska högsk.)
City: Luleå
Organization: Blekinge Institute of Technology
Department: Dept. of Signal Processing (Institutionen för signalbehandling)
Dept. of Signal Processing S-372 25 Ronneby
+46 455 780 00
Authors e-mail:
Language: English
Abstract: The use of hands-free communication in cars, computer applications and video conferencing has created a demand for high-quality acoustic echo cancellation. In these applications these acoustic channel has typically a long impulse response in the order of 100ms. Typical lengths of adaptive FIR-filters can be 500-1500 taps. In order to reduce the complexity and also to improve the convergence rate, subband processing schemes have been suggested. This paper presents an implementation of a delayless subband adaptive filter. The study shows a possible suppression of about 30 dB and also a more rapid convergence compared to a fullband LMS-filter.
Subject: Signal Processing\Speech Enhancement