Multiplex communications – Wide area network – Packet switching
Patent
1991-12-16
1994-12-27
Olms, Douglas W.
Multiplex communications
Wide area network
Packet switching
3701104, 370112, 370 20, 375 39, 371 371, H04J 312
Patent
active
053771940
ABSTRACT:
In a time-division multiplexing communications system, which transmits information from various sources in different time-slots, additional information is transmitted by varying the pattern of time slot assignments in accordance with a set of rules. As a result, the assignment pattern by which time slots are assigned to each of the various sources of information, conveys additional information. Specifically, a High Definition Television (HDTV) transmission system is constructed in which picture information is transmitted by time-division-multiplexing between two different, and disjoint, signal point constellations. Additional information is conveyed by the rule for switching between the different signal point constellations.
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AT&T Corp.
Nguyen Chau T.
Olms Douglas W.
Opalach Joseph J.
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