Chroma burst derived clock regenerator for teletext decoder

Details Chroma burst derived clock regenerator for teletext decoder Chroma burst derived clock regenerator for teletext decoder

1984-06-26

1986-12-02

Groody, James J.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

358142, 358 19, 370120, H04N 7087, H04N 945

Patent

active

046269134

ABSTRACT:
A color reference signal produced by a color oscillator is coupled to a frequency converter that generates a signal having a frequency that is a multiple of that of the color reference signal. The phase of the frequency converter output signal is adjusted in accordance with the phase of the clock synchronization sequence pulses of a teletext data line signal to produce a regenerated clock. Edges of the regenerated clock define the times in which corresponding bits of the teletext data line contain valid digital information.

REFERENCES:
patent: 4288809 (1981-09-01), Yabe
patent: 4313134 (1982-01-01), Rustman et al.
patent: 4422176 (1983-12-01), Summers
An application note that appears in a publication entitled, "Integrated Circuit Databook", dated Oct., 1983, published by Plessey Solid State, Irvine, California 92714.
A data sheet for a teletext video processor SAA5030 produced by Mullard Co., dated Jun., 1981.
An article entitled, "Teletext Decoder" that appears in a publication entitled, LSI Circuits for Teletext and Viewdata, The Lucy Generation, pp. 15-20, dated Jun., 1981, published by Mullard Limited, London, England.
A data sheet for videotext data slicer and clock regenerator SL9100EXP published by Plessey Semiconductors, Ltd.

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