Echo canceller canceling an echo according to timings of producing and detecting an identified frequency component signal
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United States of America Patent
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Apr 30, 2013
Grant Date -
Sep 9, 2010
app pub date -
Jan 28, 2010
filing date -
Mar 3, 2009
priority date (Note) -
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Abstract
An echo canceller includes an initial delay estimator producing a reference signal containing an identified frequency component masked by means of frequency masking effect to output the reference signal on an echo path, and detecting, from a sending voice signal, an echo component of the identified frequency component derived from the reference signal. The estimator finds an initial delay amount on the echo path on the basis of a forming timing of the reference signal containing the identified frequency component and a detection timing of the echo component in the identified frequency component in the sending voice signal. The echo canceller includes a delay circuit for delaying a received voice signal by the initial delay amount on the echo path obtained from the estimator to supply a resulting signal to a pseudo echo generator.
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