Teletext decoders

Details Teletext decoders Teletext decoders

1989-05-23

1990-03-20

Shepperd, John W.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

358142, H04N 7087

Patent

active

049105957

ABSTRACT:
A teletext decoder is provided with a page memory having rows (R0 to R73) for storing corresponding packets of teletext data, the page memory being provided with at least one extra memory bit (F1, F2) for each row thereof, the extra memory bits constituting flags (F1, F2) which may be selectively set by the processor software in order to initiate selective action in respect of those packets which correspond to the flagged rows. The selective action might be to permit or prevent packets being written into memory or to alert the processor that immediate processing of a flagged packet is required.

REFERENCES:
patent: 4719510 (1988-01-01), Kinghorn
Data Sheet for SAA9040; "Computer Controlled Teletext Extension" by Mullard; Mar. 1986; pp. 593-602.
Mullard Application Laboratory; Mitcham; "Computer Controlled Teletext: User's Manual", by Kinghorn; 11/1/83.

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