An Improvement of the Two-Path Algorithm Transfer Logic for Acoustic Echo Cancellation

Document type: Journal Articles
Article type: Original article
Peer reviewed: Yes
Author(s): Fredric Lindström, Christian Schüldt, Ingvar Claesson
Title: An Improvement of the Two-Path Algorithm Transfer Logic for Acoustic Echo Cancellation
Journal: IEEE Transactions on Audio, Speech, and Language Processing
Year: 2007
Volume: 15
Issue: 4
Pagination: 1320-1326
ISSN: 1558-7916
Publisher: IEEE
URI/DOI: 10.1109/TASL.2007.894519
ISI number: 000245909800018
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: Adaptive filters for echo cancellation generally need update control schemes to avoid divergence in case of significant disturbances. The two-path algorithm avoids the problem of unnecessary halting of the adaptive filter when the control scheme gives an erroneous output. Versions of this algorithm have previously been presented for echo cancellation. This paper presents a transfer logic which improves the convergence speed of the two-path algorithm for acoustic echo cancellation, while retaining the robustness. Results from simulations show an improved performance, and a fixed-point DSP implementation verifies the performance in real-time
Subject: Signal Processing\General
Keywords: acoustic echo cancellation, adaptive filtering, two-path, parallell filters, shadow filter, transfer logic
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