Teletext framing code detector

Details Teletext framing code detector Teletext framing code detector

1983-10-18

1986-03-18

Chin, Tommy P.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

358142, H04N 7087, H04N 708

Patent

active

045772274

ABSTRACT:
In a teletext decoder, a data slicer takes an analog teletext-encoded composite video signal and produces a plurality of serial bits therefrom. A serial-to-parallel converter forms bytes of incoming data from the plurality of bits. To detect the framing code byte in the teletext packet, signals representative of the prime implicants associated with the bytes of incoming data are derived. The derived prime implicant signals are logically analyzed to detect the presence of the prime implicants associated with the framing code.

REFERENCES:
"Broadcast Teletext Specification", published jointly by British Broadcasting Corporation, Independent Broadcasting Authority and British Radio Equipment Manufacturers' Association, Sep. 1976.
"Wireless World Teletext Decoder", part 1-8, published in Wireless World, Nov. 1975-Jun. 1976.
Article by P. Frandon & 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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