Double-talk insensitive NLMS algorithm
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United States of America Patent
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Aug 19, 2003
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N/A
app pub date -
Oct 21, 1998
filing date -
Oct 24, 1997
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Abstract
A method of canceling echo signals in a telephone network operating in a double talk mode has been developed. A system for implementing the method is also presented. In the invention the conventional normalized least mean square (NLMS) algorithm for echo cancellers is modified such that echo path changes continue to be tracked even after a double talk condition has been detected. The modified algorithm, known herein as a double-talk normalized least mean square (DNLMS) algorithm adaptively adjusts the convergence rate based on the power difference between the echo signal or the residual signal and the far end signal.
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