Patent · US Active

Echo canceller and a method thereof

US8983058B2 · kind B2 · utility

0Cited by

1References

17Claims

0Family size

Assignee

Telefonaktiebolaget LM Ericsson (Publ) · SE

Inventors

Anders Eriksson · Sollentuna, SE
Per Ahgren · Knivsta, SE

Key dates

Filing date	Apr 22, 2010
Grant date	Mar 17, 2015
Priority date	—
Expiry date	May 7, 2030

Classification

Technology area (CPC H)Electricity
CPC primaryH03H2021/0083
WIPO fieldTelecommunications
WIPO sectorElectrical engineering

Abstract

The present invention relates to an echo canceller (300) for estimating a model of an echo signal and a method thereof. The echo canceller comprises at least an adaptive main filter (301) for modeling the echo signal and an adaptive shadow filter (302) for modeling the echo signal. The adaptive main filter is an adaptive filter for which the adaptation speed is proportional to a system noise estimate and the adaptation speed of the shadow filter (302) is faster than the adaptation speed of the adaptive main filter (301). The echo canceller (300) comprises a processor (303) for determining whether the adaptive shadow filter models the echo signal better than the adaptive main filter and an updater (304) for updating the system noise estimate of the adaptive main filter (301) if the adaptive shadow filter models (302) the echo signal better than the adaptive main filter (301).

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.