Echo cancellation is one of the most important factors affecting the quality of speech communications using voice-over Internet protocol (VoIP), especially when users have discrete microphones and loudspeakers rather than a standard headset. Because the remote voice appears near the loudspeaker, both the near and far voices appear at the microphone. A new approach to aid the echo-cancelling algorithm embeds a hidden watermark signal into the arriving signal. Detecting this signature allows the algorithm to stop or restart the process of the adaptive echo cancellation.
Szwoch, Grzegorz; Czyzewski, Andrzej; Ciarkowski, Andrzej
Affiliation: Multimedia Systems Department, Gdansk University of Technology, Gdansk, Poland
JAES Volume 57 Issue 11 pp. 916-926; November 2009
Publication Date: November 23, 2009
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