Two-way multiple access communication system, and a central stat

Details Two-way multiple access communication system, and a central stat Two-way multiple access communication system, and a central stat

1996-12-16

1999-06-29

Ton, Dang

Multiplex communications

Duplex

Time division

370524, H04J 300

Patent

active

059178108

ABSTRACT:
A CATV system (1) operating as a two-way multiple access communication system in which a plurality of user stations (US1 to US5) communicate with a central station (CS) which can provide video programs. The system (1) can be an interactive TV system in which the user stations (US1 to US5) can order a specific program, or can respond to multiple choice questions in a program, or the like. For exchanging session accompanying information between the central station (CS) and the user stations (US1 to US5) a common control channel is provided. For true interactivity in high capacity and high user density systems, session accompanying control information is exchanged between the central station (CS) and the user stations (US1 to US5) via dedicated control channels (DSCS, USCS). Such a system (1) satisfies the needs of all kinds of multi-media systems, interactivity being an important feature in such systems.

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"Videokompressionsverfahren Verlust Ohne Frust", Funkschau Nov. 1994, pp. 55-59.

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