Coefficient domain history storage of voice processing systems
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United States of America Patent
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Aug 1, 2006
Grant Date -
May 8, 2003
app pub date -
Nov 5, 2001
filing date -
Nov 5, 2001
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Abstract
A method and apparatus for canceling a near-end echo of a far-end signal for each channel of a voice over packet multi-channel communications gateway. The invention applies 'off-the-shelf' coding mechanisms as well as novel coding schemes to provide fixed compression rate and with options to maintain perfect speech integrity on certain processing components, such as network echo canceller, acoustic echo canceller, Voice Activity Detector, Comfort Noise Generation, etc. The off-the-shelf compression algorithm includes LPC-10, G.723.1, G.729A. The alternatives are Wavelet transform, DPCM, and ADPCM, etc.
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