Echo cancellation apparatus, systems, and methods

Details Echo cancellation apparatus, systems, and methods Echo cancellation apparatus, systems, and methods

2005-08-09

2005-08-09

Isen, Forester W. (Department: 2644)

Telephonic communications

Echo cancellation or suppression

Using digital signal processing

C379S390020

Reexamination Certificate

active

06928161

ABSTRACT:
An echo cancellation unit includes a model store to store a current echo model from an adaptive filter when a real-time error occurs. The real-time error is detected by monitoring a convergence metric. In some embodiments, the convergence metric is echo return loss enhancement (ERLE). When a real-time error occurs, the current echo model is saved, and the adaptive filter is reset such that it will begin converging from the origin. As a new model emerges in the adaptive filter, it is compared to the saved model in the model store at several time lags. If a match is found, the emerging model is replaced with the saved model at the appropriate time lag. The result is faster convergence of the adaptive filter than if the adaptive filter were left to converge on its own.

REFERENCES:
patent: 5131011 (1992-07-01), Bergmans et al.
patent: 5343522 (1994-08-01), Yatrou et al.
patent: 6044150 (2000-03-01), Rigstad et al.
patent: WO-9715124 (1997-04-01), None
STMicroelectronics, ST75C530/ST75C540 Specification, Feb. 1999, pp. 1, 15, 17.

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