Telephonic communications – Echo cancellation or suppression – Combined diverse function
Reexamination Certificate
2000-06-27
2009-06-30
Jamal, Alexander (Department: 2614)
Telephonic communications
Echo cancellation or suppression
Combined diverse function
Reexamination Certificate
active
07555116
ABSTRACT:
The invention relates to a real time processing and management method for canceling out the echo between a loudspeaker (HP) and a microphone (M) of a computer terminal. Said method consists of establishing the loudspeaker signal or the microphone signal as a reference signal and synchronizing (A) the other signal with said reference signal, and (B) synchronizing the acquisition and audio reestablishment tasks. The delay that exists (rej) between the other signal and the reference signal is measured (C) and the existing delay value (rej) is validated (D) in order to control the delay applied to the reference signal starting from the current delay (rej). The invention can be used for computer terminals which are equipped with multi-tasks operating systems.
REFERENCES:
patent: 6154497 (2000-11-01), Gatherer et al.
patent: 6778671 (2004-08-01), Graumann
patent: 0 709 999 (1996-05-01), None
patent: 0 741 471 (1996-11-01), None
patent: 0 895 397 (1999-02-01), None
International Search Report Publication No. PCT/FR 00 01792; Report dated Aug. 28, 2000.
Deleam David
Le Tourneur Grégolre
Drinker Biddle & Reath LLP
France Telecom
Jamal Alexander
LandOfFree
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