System and method for improved use of voice activity detection

Details System and method for improved use of voice activity detection System and method for improved use of voice activity detection

2007-06-12

2007-06-12

Pham, Chi (Department: 2616)

Multiplex communications

Communication techniques for information carried in plural...

Adaptive

C704S210000, C704S226000

Reexamination Certificate

active

10331013

ABSTRACT:
The present invention is a system and method for packetizing actual noise signals, typically background noise, received by an access gateway from a speaking party and transmitting these packetized noise signals via a network to an egress gateway. The egress gateway converts the packetized noise signal into noise signals suitable for output and transmits the output noise signals to a listening party. When the access gateway detects that no voice signal is being received and only a noise signal is being received for a predetermined period of time, the access gateway instructs the egress network to continually transmit output noise signals to the listening party and ceases to transmit packetized noise signals to the egress gateway.

REFERENCES:
patent: 5897613 (1999-04-01), Chan
patent: 6360265 (2002-03-01), Falck et al.
patent: 6643617 (2003-11-01), Wood et al.
patent: 2002/0006137 (2002-01-01), Rabenko et al.
“Carrier Grade Voice Over IP,” by Daniel Collins, McGraw-Hill, New York, San Francisco, Washington, D.C.
“A Silence Compression Scheme For G.729 Optimized For Terminals Conforming To Recommendation V.70,” Series G: Transmission Systems And Media, Digital Transmission Systems—Terminal Equipments—Coding of Analogue Signals By Methods Other Than PCM, Coding Of Speech At 8 kbit/s Using Congugate Structure Algebraic-Code-Excited Linear-Prediction (CS-ACELP), ITU-T Recommendation G.729—Annex B.

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