Framing code windows repositioning apparatus and method for tele

Details Framing code windows repositioning apparatus and method for tele Framing code windows repositioning apparatus and method for tele

1990-06-07

1991-09-03

Kostak, Victor R.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

358146, H04N 704

Patent

active

050459414

ABSTRACT:
A teletext decoder includes a data acquisition and control circuit (DAC) which may be operated in either of two modes under the control of a microcontroller (MC). In one mode a framing code window used for detecting a framing code in received data pulses (D) is generated internally and is used in conjunction with data lines of a received video signal where teletext data is expected to occur. In the other mode a framing code window is generated externally by means of an applied line sync signal (S) and is used in conjunction with lines of a received video signal where teletext data is not expected to occur e.g. during ITS lines and normal picture lines. In this way the problem of "junk" data is greatly alleviated.

REFERENCES:
patent: 4841365 (1989-06-01), Guenat et al.
Broadcast Teletext Specification, Sep. 1976, pp. 1--20, published jointly by British Broadcasting Corporation, Independent Broadcasting Authority, British Radio Equipment Manufacturers' Assocation.
PHILIPA Data Handbook, "Video and Associated Systems-Bipolar, MOS", Book IC02 a, 1988, pp. 649-679.
RTC Laboratories D'Applications, "CMOS Interface for Data Acquisition & Control", PREVIEW Third Review), pp. 2-40, undated.

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