Patent · US Active

System and method for echo cancellation

US8600038B2 · kind B2 · utility

5Cited by

7References

38Claims

0Family size

Assignee

QUALCOMM Incorporated · US

Inventors

Asif Iqbal Mohammad · San Diego, US
Steven L. Grant · Raleigh, US
Heejong Yoo · San Diego, US
Deepak Kumar Challa · San Diego, US

Key dates

Filing date	Sep 4, 2008
Grant date	Dec 3, 2013
Priority date	—
Expiry date	Mar 4, 2032

Classification

Technology area (CPC H)Electricity
CPC primaryH04B3/234
WIPO fieldTelecommunications
WIPO sectorElectrical engineering

Abstract

An echo canceller for improved recognition and removal of an echo from a communication device. The echo canceller can dynamically reduce echo using an improved energy estimator and an improved adaptive filter. The improved energy estimator can determine if conversation is in a single talk period or a double talk period based on the combined energy of both the near end background noise and speech. The improved adaptive filter can reduce echo by dynamically changing adaptation speed or step size. In double talk, the adaptive filter(s) can dynamically slow-down or stop adaptation. In single talk, the filter can dynamically increase the speed of adaptation to improve accuracy, or decrease adaptation speed for stability.

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