Title:
METHOD AND APPARATUS FOR ACTIVE REDUCTION OF SPEAKERPHONE ECHO
Document Type and Number:
WIPO Patent Application WO2002054719
Kind Code:
A3
Abstract:
In a speakerphone device identification of signals i.e., voice input or speaker output in a process for reducing acoustic feedback, in a communication device, is accomplished by adding a signature nois i.e., an identification mark to output signals radiated by the speaker to enable these signals to be separated from speech input to the microphone. The signature noise entering the microphone is identified and analysed. The information obtained from the analysis is then used to control the echo cancellation of the device.
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Inventors:
ERVING RICHARD HENRY
MILLER II ROBERT RAYMOND
MILLER II ROBERT RAYMOND
Application Number:
PCT/US2001/050571
Publication Date:
June 05, 2003
Filing Date:
December 21, 2001
Export Citation:
Assignee:
AT & T CORP (US)
International Classes:
H04M9/08; H04R3/02; (IPC1-7): H04M9/08; H04R3/02
Foreign References:
| US5619580A | 1997-04-08 | |||
| EP0969692A1 | 2000-01-05 | |||
| US5991418A | 1999-11-23 | |||
| EP0903726A2 | 1999-03-24 |
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