Pulse or digital communications – Transceivers – Modems
Reexamination Certificate
2007-02-06
2007-02-06
Patel, Jay K. (Department: 2611)
Pulse or digital communications
Transceivers
Modems
C375S219000, C375S220000
Reexamination Certificate
active
10614434
ABSTRACT:
A technique for identifying the encoding law utilized by a central office codec may be implemented in a receive modem. The encoding law, which is typically dictated by the country in which the central office is located, is employed to generate a plurality of transmission levels during an initialization period associated with the modem system. The receive modem analyzes a number of these transmission levels to determine whether the levels have certain characteristics associated with the particular encoding law followed by the central office codec. When the receive modem detects the codec type, it may transmit a suitable identifier back to the transmit modem.
REFERENCES:
patent: 4021652 (1977-05-01), Munter
patent: 4403322 (1983-09-01), Kato et al.
patent: 4507792 (1985-03-01), Yamakido et al.
patent: 4661946 (1987-04-01), Takahasi et al.
patent: 4819253 (1989-04-01), Petruschka
patent: 5243342 (1993-09-01), Klattemalavadi et al.
patent: 5311578 (1994-05-01), Bremer et al.
patent: 5497373 (1996-03-01), Hulen et al.
patent: 5652782 (1997-07-01), Hughes-Hartogs
patent: 5784405 (1998-07-01), Betts et al.
patent: 5793809 (1998-08-01), Holmquist
patent: 5825816 (1998-10-01), Cole et al.
patent: 5825823 (1998-10-01), Goldstein et al.
patent: 5887027 (1999-03-01), Cohen et al.
patent: 6034991 (2000-03-01), Zhou et al.
patent: 6614839 (2003-09-01), Zhang et al.
patent: 0564143 (1993-03-01), None
patent: 0664638 (1994-12-01), None
patent: 07123172 (1993-10-01), None
patent: WO98/38752 (1998-02-01), None
Ayanoglu et al., “An Equalizer Design Technique For The PCM Modem: A New Modem For The Digital Public Switched Network”, IEEE Transactions On Communications, vol. 46, No. 6, Jun. 1998, pp. 763-774.
“Pulse Code Modulation (PCM) Of Voice Frequencies”, General Aspects Of Digital Transmission Systems, Terminal Equipments, ITU-I Telecommunication Standardization Sector Of ITU, International Telecommunication Union, G.711, 1993, 12 pgs.
Ayanoglu et al., “An Equalizer Design Technique For The PCM Modem: A New Modem For The Digital Public Switched Network”, IEEE Global Telecommunications Conference, Communication Theory Mini-Conference, Nov. 3-8, 1997, 10 pgs.
Zhang Xuming
Zhou Zhenyu
O'Keefe, Egan Peterman & Enders LLP
Patel Jay K.
Silicon Laboratories Inc.
Ziskind Anna
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