Special services teletext communications system

Details Special services teletext communications system Special services teletext communications system

1981-02-26

1983-07-12

Richardson, Robert L.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

H04N 700, H04N 708

Patent

active

043934048

ABSTRACT:
A teletext communications system includes a transmitter cyclically transmitting a plurality of conventional teletext encoded data rows together with one or more teletext encoded special services data rows. A plurality of teletext decoder equipped receivers are operable for acquiring the conventional teletext rows but not the special services rows. Subscribers to the special services data are provided with data decoders responsive to the cyclical transmissions for acquiring only the special services data rows, the data decoders including apparatus for storing the data encoded in an acquired special services data row and for providing a display of the information represented thereby.

REFERENCES:
patent: 4205343 (1980-05-01), Barrett
SERT Journal, vol. 11, pp. 209-213, Oct. 1977.
Electronics, vol. 51, No. 20, p. 74, Sep. 28, 1978.
NTG-Fachbev. (Germany), vol. 74, pp. 65-74, 1980.

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