Coefficient domain history storage of voice processing systems

Details Coefficient domain history storage of voice processing systems Coefficient domain history storage of voice processing systems

2006-08-01

2006-08-01

Pham, Chi (Department: 2666)

Multiplex communications

Duplex

Transmit/receive interaction control

C379S406080

Reexamination Certificate

active

07085245

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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