Method and apparatus for performing echo cancellation
AssigneeNortel Networks Limited
InventorsH. S. Peter Yue, Sylvain Angrignon
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Abstract
An echo cancellation device for reducing a magnitude of an echo occurring in a voice signal propagating in a channel of a communication system. The echo cancellation device is capable to selectively acquire an active operative mode and an inactive operative mode in response to a condition indicative of a level of echo present in the voice signal. In the active operative mode the echo cancellation device performs echo cancellation on the voice signal. In the inactive operative mode the echo cancellation device allows the voice signal to propagate without performing any echo cancellation.
Claims12
An echo cancellation device for reducing a magnitude of an echo occurring in a voice signal propagating in a channel of a communication system, said echo cancellation device being capable to selectively acquire an active operative mode and an inactive operative mode, in the active operative mode said echo cancellation device performing echo cancellation on the voice signal, in the inactive operative mode said echo cancellation device allowing propagation of the voice signal without performing echo cancellation, said echo cancellation device being responsive to a condition indicative of a level of echo occurring in the voice signal to selectively acquire said active or said inactive operative mode.
A method for performing echo cancellation comprising:
- receiving a voice signal potentially containing echo;
- detecting a condition indicative of a level of echo present in the voice signal;
- a) if the condition is indicative of a level of echo that is below a certain threshold, allowing the voice signal to propagate without performing any echo cancellation;
- b) the condition is indicative of a level of echo that is above the certain threshold, performing echo cancellation on the voice signal.
Dependencies are inferred from the claim text.