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Echo cancellation
KTH, School of Electrical Engineering (EES), Signal Processing. KTH, School of Electrical Engineering (EES), Centres, ACCESS Linnaeus Centre.ORCID iD: 0000-0002-2718-0262
2002 (English)Patent (Other (popular science, discussion, etc.))
Abstract [en]

The present invention relates to a cancellation of echoes in telecommunications systems, more specifically it relates to adaptive alignment of a linear filter (500) used for echo cancellation. According to the invention, it is continuously determined, by means of control logic (520), if a reflection replica delay included in an echo replica signal (110), which delay is provided by a signal buffer (510), should be attempted to be increased or not. Similarly, it is continuously determined if the reflection replica delay should be attempted to be decreased or not. In this way it is possible to provide a delay of the reflection replica which corresponds to the pure delay of a corresponding reflection included in an echo signal (120) received over an echo path. The invention is advantageous since the filter (500) will continuously and quickly adapt to changes in the echo path delay by continuously increasing or decreasing, in an incremental and smooth manner, a present replica delay.

Place, publisher, year, edition, pages
US: EP 0260678A1 (Mar, 1988) ; EP 0597201A1 (May, 1994) ; US 2002/0131583 A1 (Sep, 2002) Lu 379/406.08; US 4582963 A (Apr, 1986) Danstrom; US 5859907 A (Jan, 1999) Kawahara et al.; US 5920548 A (Jul, 1999) El Malki; US 6493448 B1 (Dec, 2002) Mann et al. 379/406.01; US 7039182 B1 (May, 2006) Leonidov et al. 379/406.05; WO 99/31866 A1 (Jun, 1999) ; WO 01/45291 A1 (Jun, 2001) ; WO 99/31866 A1 (Jun, 1999) , 2002. Vol. 10512569, no US 7366118
National Category
Engineering and Technology Telecommunications
URN: urn:nbn:se:kth:diva-83552OAI: diva2:498827
SE 525053 (2004-11-16)

US 7366118-B2 (2008-04-29); EP 1500210-B1 (2008-12-24); CN 100593287-C (2010-03-03)

Available from: 2012-02-12 Created: 2012-02-12 Last updated: 2013-08-07Bibliographically approved

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Händel, Peter
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Signal ProcessingACCESS Linnaeus Centre
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