Patent · US Expired

Method and apparatus for controlling echo on both sides of a connection

US6064873A · kind A · utility

10Cited by

9References

20Claims

0Family size

Assignee

Telefonaktiebolaget LM Ericsson (Publ) · SE

Inventors

Gunnar Eriksson · Sollefteå, SE
Tonu Trump · Stuvsta-Snättringe, SE
Tommy E. Svensson · Lund, SE

Key dates

Filing date	Mar 26, 1997
Grant date	May 16, 2000
Priority date	—
Expiry date	Mar 26, 2017

Classification

Technology area (CPC H)Electricity
CPC primaryH04M9/082
WIPO fieldTelecommunications
WIPO sectorElectrical engineering

Abstract

A single two-ended echo canceller is provided that uses an adaptive FIR filter to model the impulse response of the echo path and cancel the echo originating from the PSTN side of the connection, and a non-linear processor controlled by input signal levels to cancel the echo originating from the mobile phone side of the connection. Since the linear processing function is not used for cancelling echoes of the mobile phone side, the algorithms directed to estimating and cancelling echoes on the two sides of the connection can be executed in a single DSP, with all of the attendant advantages.

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