Two-way data broadcast networks

Details Two-way data broadcast networks Two-way data broadcast networks

1988-04-11

1990-05-22

Groody, James J.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

358147, H04N 708

Patent

active

049281771

ABSTRACT:
Forward link communication is achieved utilizing a conventional television broadcast station, either utilizing an entire presently unused TV channel or in a shared TV mode, with the return link communication being achieved using narrow band communication techniques for relatively low data rate communication through conventional television receiver aerials to a central receiver near the television station transmitter. The carrier reference of a local AM radio station is used as a synchronizing reference for the data streams and to allow the very close sepraration of each band in the return communication link to allow a large number of remote receivers to simultaneously communicate in the reverse link. Alternatively, the TV Chroma subcarrier serves this purpose.

REFERENCES:
patent: 4454538 (1984-06-01), Toriumi
patent: 4591906 (1986-05-01), Morales Gorza
Graf, Rudolf F., "Dictionary of Electronics", Fourth Edition, second printing, 1974, Howard W. Sams & Co., p. 591.

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