Apparatus to display graphic messages transmitted by videotext s

Facsimile and static presentation processing – Facsimile – Specific signal processing circuitry

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340721, H04N 708, G06F 314

Patent

active

044867794

ABSTRACT:
A TV receiver is adapted to display either the regularly broadcast video signals or videotext information. The video signals contain their own internal synchronization signals. The videotext information requires locally generated synchronization signals which may be used to replace the normal video internal synchronization signals. The invention provides means for switching between the normally broadcast and the internally generated synchronization signals.

REFERENCES:
patent: 4303941 (1981-12-01), Marti
patent: 4393404 (1983-07-01), Cox
Designing for Consumer Electronics-Teletext and Viewdata, by Looks, Electic Engineering, Jan. 1980, pp. 61-77.
Simplify Video-Display Design by Using a Versatile IC Controller, by Hayden Publishing Co., Electronic Design, vol. 27, No. 13, 6/79, pp. 94-102.
Le System Antiope, Toute L'Electronique, No. 439, Jan. 1979, Paris, Fr., pp. IV-IX.
Variable Spaced Alphanumeric Display, by J. E. R. Young, IBM Technical Disclosure Bulletin, vol. 21, No. 1, Jun. 1978, pp. 379-380.
Digital TV Graphics, by Herbert C. Hendrickson, Institute of Electrical and Electronics Engineers, Nerem Record: Boston, Nov. 6-8, 1973, vol. 15, No. 4, pp. 39-46.
Enhanced UK Teletext Moves Towards Still Pictures, by John Chambers, IEEE Transactions on Consumer Electronics, vol. CE-26, 8/1980, pp. 527-554.
The Application of Picture Coding Techniques to Viewdata, by K. Clarke, IEEE Transaction on Consumer Electronics, vol. CE-26, Aug. 1980, pp. 568-577.
An Integrated Teletext and Viewdata Receiver, by Insam, et al., The Sert Journal, vol. 11, Oct. 1977, pp. 210-213.

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