Synchronization of echo cancellers in a voice processing system
AssigneeTellabs Operations, Inc.
InventorsDaniel J. Marchok, Richard C. Younce, Charles W. K. Gritton, Ravi Chandran
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Abstract
Methods and apparatus for processing a received voice signal from a variable-delay network by a communications system that has at least one echo canceller. An echo canceller determines delay characteristics that are associated with the received voice signal and correspondingly modifies echo cancellation processing. In a variation of the embodiment of the invention, a first echo canceller sends silence descriptor information to a second echo canceller. The second echo canceller reconstructs a voice signal based upon the silence descriptor information and excitation vector information.
Claims9
In a communication system comprising a plurality of echo cancellers coupled to a variable-delay network, a method comprising:
- determining, by a first echo canceller of the at least one echo canceller, delay characteristics related to at least one voice signal received via the variable delay network;
- determining, by the first echo canceller, that delay characteristics corresponding to the at least one voice signal have changed;
- receiving information regarding changes to corresponding delay characteristics corresponding to a second echo canceller of the plurality of echo cancellers;
- and
- modifying, by the first echo canceller, echo cancellation processing on the at least one voice signal in response to the changed delay characteristics.
In a communication system comprising at least one echo canceller coupled to a variable-delay network, a method comprising:
- determining, by a first echo canceller of the at least one echo canceller, delay characteristics related to at least one voice signal received via the variable delay network;
- determining, by the first echo canceller, that delay characteristics corresponding to the at least one voice signal have changed;
- prior to the determining that the delay characteristics have changed, determining that echo cancellation performance has degraded, wherein the echo cancellation performance is indicative of a magnitude of echo;
- and
- modifying, by the first echo canceller, echo cancellation processing on the at least one voice signal in response to the changed delay characteristics.
A Communication system coupled to a variable-delay network, the communications system comprising:
- means for determining, by a first echo canceller of at least one echo canceller, delay characteristics related to at least one voice signal received via the variable delay network;
- means for determining, by the first echo canceller, that delay characteristics corresponding to the at least one voice signal have changed;
- means for receiving information regarding changes to corresponding delay characteristics corresponding to a second echo canceller of the at least one echo cancellers;
- and
- means for modifying, by the first echo canceller, echo cancellation processing on the at least one voice signal in response to the changed delay characteristics.
Dependencies are inferred from the claim text.