Route delay sensitive echo cancellation

Details Route delay sensitive echo cancellation Route delay sensitive echo cancellation

2005-06-28

2005-06-28

Tran, Sinh (Department: 2644)

Telephonic communications

Echo cancellation or suppression

C379S406020, C379S406050, C379S406060, C379S406080, C379S406090, C379S406100, C379S406110

Reexamination Certificate

active

06912281

ABSTRACT:
Long distance telephone connections must commonly employ echo cancellers to eliminate irritating echo. The normal practice is to additionally employ non-linear processors (NLPs) as an integral component of an echo canceller in order to eliminate small residual echo which remains after initial echo cancellation. While such devices do indeed remove remaining residual echo, they also may introduce additional problems, such as suppression of the background signal. However, in some cases there is no need to deploy a potentially problematic non-linear processor. If the overall route delay of the telephone connection is not excessive, the participants do not notice the residual echo. Therefore, a determination is made of the end to end delay of the overall telephone connection. If the determined delay is not excessive, non-linear processing is not applied or is applied less aggressively. This results in a clearer telephone call, free from non-linear processor problems.

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