A Method for Reduced Finite Precision Effects in Parallel Filtering Echo Cancellation

Document type: Journal Articles
Article type: Original article
Peer reviewed: Yes
Author(s): Fredric Lindström, Christian Schüldt, Mikael Långström, Ingvar Claesson
Title: A Method for Reduced Finite Precision Effects in Parallel Filtering Echo Cancellation
Journal: IEEE transactions on circuits and systems I-Regular Papers
Year: 2007
Volume: 54
Issue: 9
Pagination: 2011-2018
ISSN: 1057-7122
Publisher: IEEE
URI/DOI: 10.1109/TCSI.2007.904664
ISI number: 000249730800014
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
http://www.tek.bth.se/
Authors e-mail: fli@bth.se, csc@bth.se, icl@bth.se
Language: English
Abstract: The two-path algorithm is an adaptive filter algorithm based on a parallel filter structure, which has been found to be useful for line echo cancellation as well as for acoustic echo cancellation. It is well known that in finite precision arithmetic, the adaptation process of adaptive algorithms can be reduced or even halted due to finite precision effects. This paper proposes a variant of the two-path scheme where the effects of quantization are reduced, without any significant increase in complexity. The improvement is shown by simulations using bandlimited flat spectrum noise as well as real speech signals.
Subject: Signal Processing\General
Keywords: adaptive filtering, LMS, NLMS, two-path, parallell filters, shadow filter, fixed point, precision, stalling
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