Real time processing and management method for cancelling...

Details Real time processing and management method for cancelling... Real time processing and management method for cancelling...

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.

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