Method and apparatus for an improved echo canceller
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United States of America Patent
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Jun 15, 2004
Grant Date -
May 1, 2003
app pub date -
Oct 31, 2001
filing date -
Oct 31, 2001
priority date (Note) -
Expired
status (Latency Note)
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Abstract
Method and apparatus for an improved echo canceller provide for faster convergence in echo canceling, which also contribute to better voice quality and provide for an increase in the capacity (number of channels) of a multi-channel voice processing products. Whitening filters are used to flatten the spectrum of the signals that pass through the echo canceller. Higher convergence rate is achieved when flattened signals pass through the echo canceller. A reconstruction filter is used to introduce the spectral envelop back into the outbound signal.
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