Information transmission system

Multiplex communications – Wide area network – Packet switching

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370 94, 358 13, H04Q 1104, H04N 1104

Patent

active

048520845

ABSTRACT:
Information signals (Y1, C1; Y2, C2: Y3, C3) relating to the same video image but each defining the image with a different accuracy are transmitted asynchronously and on a time division basis as packet sets (Y1, C1; Y21, C21; Y32, C32). In a receiving station (SS2) the information signals are derived from the received packet sets and by means of selection circuit (SEC1/3) two or more of these signals are supplied to a combination device (VTE) and are combined therein to form an image.

REFERENCES:
patent: 4706109 (1987-11-01), Murray
patent: 4716453 (1987-12-01), Pawelski
patent: 4734907 (1988-03-01), Turner
J-Y Cochennec et al.; "Asynchronous Time Division Networks: Terminal Synchronization For Video And Sound Signals"; Globecom '85, IEEE Global Telecommunications Conference, New Orleans, Louisiana; Dec. 2-5, 1985; pp. 791-794.
W. D. Hofmann and D. E. Toxel; "Making Progressive Transmission Adaptive"; IEEE Transactions on Communications, vol. COM. 34, No. 8; Aug. 1986; pp. 806-813.
P. Gonet, J. P. Coudreuse; "Techniques Temporelles Asynchrones Et Reseaux Integres De Videocommunications"; Second International Conference On New Systems and Services in Telecommunication, Nov. 16-18, 1983, Liege, Belgium; pp. G6.1-G6.7.

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