Telecommunications – Transmitter and receiver at separate stations – Single message via plural carrier wave transmission
Patent
1994-03-10
1997-11-18
Pham, Chi H.
Telecommunications
Transmitter and receiver at separate stations
Single message via plural carrier wave transmission
455 561, 375356, H04B 700
Patent
active
056898088
ABSTRACT:
Apparatus for effecting simulcast data broadcasting includes a source of information, a network control unit, and a plurality of transmitters. The network control unit includes a high-stability timebase which is coupled to the source of information to produce a signal clocked from the high-stability timebase and containing data and digital identifying information. Each of the plurality of transmitters is coupled to the network control unit to receive the signal, and each has a modulation-generating timebase. Each modulation-generating timebase is phase locked to the high-stability timebase by way of synchronization information included in the signal, and each is adjusted by a corresponding correction value provided by the network control unit, thereby providing a highly accurate coincident modulation of the plurality of transmitters during a radio broadcast containing the signal.
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C-Net Platinum Advanced Paging Network, Sep. 1991.
McFarland Scott A.
Nagel John F.
Sandahl Joel E.
Macnak Philip P.
Motorola Inc.
Pham Chi H.
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