Telephonic communications – Echo cancellation or suppression
Reexamination Certificate
2007-10-02
2007-10-02
Kuntz, Curtis (Department: 2614)
Telephonic communications
Echo cancellation or suppression
C379S406060
Reexamination Certificate
active
11243236
ABSTRACT:
An audio communications system has an acoustic echo cancellation (AEC) module. The AEC module receives a digital signal sent to a loudspeaker and a digital signal received from a microphone. The signal received from the microphone contains an echo of the signal played through the loudspeaker. The loudspeaker signal is processed by an audio generation module (AGM) that models substantially nonlinear distortions that can occur while producing the signal played through the loudspeaker. The AGM includes a modeling path comprised of one or more distortion modules. Each distortion module receives digital samples as input, modifies the samples to model a form of distortion, and outputs the modified samples. The output of the AGM is provided to an acoustic echo estimation (AEE) module that uses adaptive algorithms to compensate for substantially linear changes in the echo characteristics of the environment in which the loudspeaker and microphone are located.
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Jamal Alexander
Kuntz Curtis
Tandberg Telecom AS
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