Method and apparatus for performing echo canceller specific automatic gain control
AssigneeMotorola, Inc.
InventorsMansour Tahernezhaadi, Michael J. Kirk
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Abstract
A method and apparatus that performs specific automatic gain control in an echo canceller (16). The disclosed method and apparatus utilize a low complexity algorithm that performs automatic gain control to achieve greater speed of convergence of the echo canceller (16) and an increased ability to distinguish between near-end speed and echo through the use of specific automatic gain control. A double talk threshold of the echo canceller is adjusted by using, in part, computed gains of inbound and outbound signals internally within the echo canceller in order to adjust the echo canceller double talk threshold.
Claims14
A method for controlling echo cancellation within a communication system comprising the steps of:
- computing a computed gain of at least one of an inbound signal to a portion of the communication system and an outbound signal from the portion of the communication system when one or more predetermined conditions exist within at least the portion of the communication system;
- and
- selectively applying the computed gain to control echo cancellation at least within an echo canceller that effects echo cancellation within the communication system according to a plurality of predetermined gain control operation modes.
An apparatus for controlling echo cancellation within a communication system comprising:
- an echo canceller having an echo cancelling logic that is configured to compute a gain of at least one of an inbound signal to the echo canceller and an outbound signal from the echo canceller when one or more predetermined conditions exist within at least a portion of the communication system;
- and
- wherein the an echo cancelling logic is further configured to selectively apply the computed gain to control echo cancellation at least within the echo canceller according to at least one of a plurality of predetermined gain control operation modes.
Dependencies are inferred from the claim text.