Multiplex communications – Special services – Special feature of multiplex telephone terminal
Reexamination Certificate
2005-03-29
2005-03-29
Pezzlo, John (Department: 2662)
Multiplex communications
Special services
Special feature of multiplex telephone terminal
C370S395520
Reexamination Certificate
active
06873604
ABSTRACT:
A method is disclosed, where the RX unit of an IP telephone waits for a first silence indication packet to be received. When the first silence indication packet is received, the RX begins attenuating incoming packets. The rate of attenuation may occur at a rate responsive to an indication provided by the TX unit. The RX unit also mixes comfort noise with the attenuated incoming packets. The RX unit the waits for a second silence indication packet to be received. When the second silence indication is received the RX unit mixes in comfort noise at a level responsive to an indication provided by the TX unit. The RX units then waits for voice packets to be received from the TX unit. When normal voice activity resumes, the RX unit stops the generation of comfort noise and begins playing voice packets again.
REFERENCES:
patent: 4864561 (1989-09-01), Ashenfelter et al.
patent: 5537509 (1996-07-01), Swaminathan et al.
patent: 5657422 (1997-08-01), Janiszewski et al.
patent: 5787388 (1998-07-01), Hayata
patent: 5794199 (1998-08-01), Rao et al.
patent: 5978760 (1999-11-01), Rao et al.
patent: 6282182 (2001-08-01), Pecen et al.
patent: 6577862 (2003-06-01), Davidson et al.
patent: 665530 (1995-08-01), None
patent: 694903 (1996-01-01), None
Mouly, Michel et al. “The GSM System for Mobile Communications”. Cell & Sys Publishers. 1992. pp. 161-165.*
Vahatalo, A. et al. “Voice Activity Detection for GSM Adaptive Multi-rate Codec”, IEEE Workshop on Speech Coding Proceedings, 1999. Porvoo, Finland. Jun 20-23, 1999. pp. 55-57.*
W. Witowsky, “White Paper: IP Telephone Design and Implementation Issues”, [Internet] http://www.telogy.com/our_products/golden_gateway/IPphone.html, pp. 1-13 printed Jul. 8, 2000.
Huart Pascal
Knappe Michael
Surazski Luke
Cisco Technology Inc.
Mills Donald L
Pezzlo John
Sierra Patent Group Ltd.
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