An Acoustic Echo Canceller Using Subband Adaptive Filters

Document type: Conference Papers
Peer reviewed: Yes
Full text:
Author(s): Sven Nordholm, Jörgen Nordberg, Joakim Skoog
Title: An Acoustic Echo Canceller Using Subband Adaptive Filters
Conference name: 4th UK/Australian Symposium on DSP for Communication Systems
Year: 1996
City: Perth
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
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 have the acoustic channel 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 improve the convergence rate have subband processing schemes 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 than a fullband LMS-filter.
Subject: Signal Processing\Filter Design
Signal Processing\Detection and Classification