Patent · US Active

Echo canceller with interference-level controlled step size

US7813497B2 · kind B2 · utility

4Cited by

3References

26Claims

0Family size

Assignee

ST-ERICSSON SA · CH

Inventor

Wolfgang Brox · Heidelberg, DE

Key dates

Filing date	Jan 20, 2005
Grant date	Oct 12, 2010
Priority date	—
Expiry date	Feb 2, 2028

Classification

Technology area (CPC H)Electricity
CPC primaryH04M9/085
WIPO fieldTelecommunications
WIPO sectorElectrical engineering

Abstract

Echo canceling method comprising the steps: a) receiving a first signal and a second signal, said second signal comprising an echo of the first signal, b) generating an echo replica signal by filtering the first signal with a finite impulse response filter, said finite impulse filter using a filter coefficient vector for generating the echo replica signal, generating an echo cancelled signal by subtracting the echo replica signal from the second signal, d) determining a measure of interference within the second signal, e) determining a step vector depending on said measure of interference, wherein increasing the measure of interference continuously reduces a size of the step vector, and f) updating the filter coefficient vector by the step vector.

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