Facsimile and static presentation processing – Facsimile – Specific signal processing circuitry
Patent
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
045959528
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 into a memory. The microcomputer reads the data provided by the prefix processor, converts it to pixel words representing picture elements and restores the converted data into the memory. The decoder includes a display processor which reads more than one pixel word at a time when accessing the memory, and translates each pixel word to 3 groups of color codes and to a one-bit transparency code.
REFERENCES:
"Wireless World Teletext Decoder" by J. F. Daniels, Wireless World, Dec. 1975.
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.
Article by B. Astle entitled, "Teletext Standards in North America", published in RCA Engineer, 28-5 Sep./Oct. 1983, pp. 15-25.
Chin Tommy P.
Henig Sammy S.
Laks Joseph J.
Parker Michael D.
RCA Corporation
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