Method of capturing constant echo path information in a full...

Details Method of capturing constant echo path information in a full... Method of capturing constant echo path information in a full...

2007-05-22

2007-05-22

Tran, Sinh (Department: 2615)

Telephonic communications

Echo cancellation or suppression

Residual echo cancellation

C379S406100

Reexamination Certificate

active

10321499

ABSTRACT:
A method of improving convergence of an echo canceller in a full duplex speakerphone, wherein the echo canceller includes LEC (Line Echo Canceller) and AEC (Acoustic Echo Canceller) portions, comprising the steps of capturing coefficients during operation, storing the coefficients, and utilizing the stored coefficients as default values during start-up of a subsequent call. According to the method of the present invention, the amount of echo cancellation necessary to provoke a save of the coefficients decreases with time when it is not achieved by the system despite the presence of a reference signal (i.e. speakerphone signal).

REFERENCES:
patent: 5838787 (1998-11-01), Ding et al.
patent: 6049607 (2000-04-01), Marash et al.
patent: 6212273 (2001-04-01), Hemkumar et al.
patent: 6226380 (2001-05-01), Ding
patent: 6510225 (2003-01-01), Robertson et al.
patent: 6516063 (2003-02-01), Farrell et al.
patent: 2 291 428 (2000-02-01), None

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