2002 (Swedish)Patent (Other (popular science, discussion, etc.))
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
Engineering and Technology
IdentifiersURN: urn:nbn:se:kth:diva-78445OAI: oai:DiVA.org:kth-78445DiVA: diva2:492498
SE 525053-C2 (2004-11-16)
US 7366118-B2 (2008-04-29); EP 1500210-B1 (2008-12-24); CN 100593287-C (2010-03-03)2012-02-082012-02-082013-08-07Bibliographically approved