Telephonic communications – Echo cancellation or suppression – Combined diverse function
Reexamination Certificate
2007-06-26
2007-06-26
Singh, Ramnandan (Department: 2614)
Telephonic communications
Echo cancellation or suppression
Combined diverse function
Reexamination Certificate
active
11293912
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.
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Chandran Ravi
Gritton Charles W. K.
Marchok Daniel J.
Younce Richard C.
Singh Ramnandan
Tellabs Operations Inc.
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