Method and apparatus for setting a step size for an adaptive filter coefficient of an echo canceller
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United States of America Patent
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Mar 16, 2004
Grant Date -
Jul 11, 2002
app pub date -
Mar 11, 1999
filing date -
Mar 11, 1999
priority date (Note) -
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Abstract
The step sizes for tap positions of an adaptive filter (124) in an echo canceller (125) for canceling an echo signal are individually selected based upon a profile of the echo environment. A training signal (112) is injected into the echo canceller and to the echo path during a training interval, or period. The adaptive filter profiles the echo path during the training interval. Respective step sizes .alpha.[k] for the tap positions are generated as a function of the echo profile so generated.
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