Methods and apparatus for providing echo suppression using frequency domain nonlinear processing
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United States of America Patent
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Dec 2, 2003
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app pub date -
Oct 23, 1998
filing date -
Oct 23, 1998
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Abstract
Frequency domain nonlinear processing techniques are applied in the context of echo suppression. According to exemplary embodiments, the filtering characteristic of a nonlinear processor is dynamically adjusted by comparing the power spectrum of a residual echo component of a communication signal with that of the overall communication signal itself. For example, the filtering characteristic can be adjusted so that the nonlinear processor blocks only those signal frequencies in which the residual echo is, in some sense, dominant. The disclosed techniques make full duplex communication possible during the entirety of a conversation, even while residual echo is being actively suppressed.
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