Teletext decoder using a common memory

Details Teletext decoder using a common memory Teletext decoder using a common memory

1983-11-29

1986-06-17

Chin, Tommy P.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

358142, 358146, H04N 7087, H04N 708

Patent

active

045959510

ABSTRACT:
A teletext decoder extracts digital information from a video signal for displaying graphics and textual information embedded in the video signal. The decoder includes a prefix processor responding to user supplied commands for selecting and storing the pertinent embedded information. The decoder includes a common memory for storing the digital words provided by the prefix processor and a microcomputer capable of reading from and writing to the common memory. The microcomputer reads the data provided by the prefix processor, converts it to digital words representing the picture elements and stores the converted digital words in the common memory. The decoder includes a display processor which reads the converted digital words from the common memory to drive an image display device.

REFERENCES:
patent: 4161728 (1979-07-01), Insam
patent: 4388639 (1983-06-01), Cox et al.
patent: 4393404 (1983-07-01), Cox et al.
A B.B.C. Research Department Report, No. BBC RD 1983/7, entitled Enhanced UK Teletext: Experimental Equipment for High-Quality Picture Coding and Other Enhancements, in the name of J. L. Riley, dated Jul. 1983.
Article by P. Frandon and G. Chauvel entitled, "Antiope LSI," published in IEEE Transactions on Consumer Electronics, vol. C-25, No. 3, Jul. 1979, pp. 334-338.

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