Videotex system

Details Videotex system Videotex system

1984-05-08

1986-03-25

George, Keith E.

Excavating

371 69, H04M 1100

Patent

active

045785350

ABSTRACT:
A videotex system employs a subscriber unit (22) at a remote location such as a user's home. The subscriber unit (22) employs the user's telephone tone dial (26) for transmission to a communications module at a central location and uses the user's television set (24) for display of information received as frequency-shift-keying signals by the user's telephone (20). At the central location, the system employs a transmission memory (16) containing the currently desired display, and a microprocessor circuit (28) reads the contents of the transmission memory (16) to send it by FSK signals to the remote location. The information contained in the transmission memory (16) comes from a host computer, and an antiquity memory (50) having locations corresponding to those of the transmission memory (16) has its associated location reset whenever a transmission-memory location is written. That antiquity-memory location is then incremented whenever the information is sent, and the microprocessor (28) at the central location repeatedly sends the contents of the transmission-memory location that has been sent least frequency as indicated by the contents in the antiquity memory (50).

REFERENCES:
patent: 3535456 (1970-10-01), Wilson
patent: 3889054 (1975-06-01), Nagel et al.
patent: 3984638 (1976-10-01), Carrouge
patent: 4093825 (1978-06-01), Gladstone et al.
patent: 4500751 (1985-02-01), Darland et al.
F. Coakley et al., "A Design for a Small View Data Centre Based on Distributed Control", International Conference on Private Electronic Switching Systems, London, England, 10-12, Apr. 1978, pp. 85-89.
J. Gecsei, "The Architecture of Videotex Systems", 1983, Prentice-Hall, Inc., Englewood Cliffs, N.J., pp. 149-159.

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