An Improved Deviation Measure for Two-Path Echo Cancellation

Document type: Conference Papers
Peer reviewed: Yes
Author(s): Christian Schüldt, Fredric Lindström, Ingvar Claesson
Title: An Improved Deviation Measure for Two-Path Echo Cancellation
Conference name: 35th International Conference on Acoustics, Speech, and Signal Processing (ICASSP)
Year: 2010
Pagination: 305-308
ISBN: 978-1-4244-4296-6
Publisher: IEEE
City: Dallas
ISI number: 000287096000074
Organization: Blekinge Institute of Technology
Department: School of Engineering - Dept. of Electrical Engineering (Sektionen för ingenjörsvetenskap - Avd. för elektroteknik)
School of Engineering S-371 79 Karlskrona
+46 455 38 50 00
http://www.bth.se/ing/
Authors e-mail: csc@bth.se, fredric.lindstrom@limesaudio.com, icl@bth.se
Language: English
Abstract: Parallel adaptive filters have been proposed for echo cancellation to solve the dead-lock problem, occurring when the echo is detected as near-end speech after a severe echo-path change; causing the updating of the adaptive filter to halt. To control the parallel filters and monitor their performance, estimates of the filter deviation (i.e. the squared norm of the filter mismatch vector) are typically used.
This paper presents a modification of a filter mismatch estimator. The proposed modification requires slightly more computational resources than the original measure, but provides a significantn improvement in terms of robustness during double-talk. This is shown both analytically and through simulations.
Subject: Signal Processing\General
Telecommunications\General
Keywords: Echo cancellation, adaptive filters, two-path, transfer logic
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