Teletext decoder arrangements

Details Teletext decoder arrangements Teletext decoder arrangements

1989-02-14

1990-03-13

Shepperd, John W.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

358142, H04N 708

Patent

active

049087061

ABSTRACT:
A teletext decoder arrangement has a page memory comprising a large number of chapters or portions in which individual pages can be stored. The arrangement has a plurality of data acquisition circuits which can acquire separate pages simultaneously. A register file is provided having a word location for each data acquisition circuit. A processor can load a memory chapter pointer byte into a word location when a page is to be acquired by the related data acquisition circuit so as to allot the memory chapter identified by the pointer byte for the storage of that page. In a practical embodiment four 4-bit word locations can have any one of 16 different 4-bit pointer bytes loaded into them to identify any one of 16 different memory chapters.

REFERENCES:
patent: 4679083 (1987-07-01), Schmitz et al.
BBC et al, "Broadcast Teletext Specification", Sep. 1976, pp. 1-20.
Specification for Mullard's SAA 5231, Nov. 1986, "Teletext Video Processor".
Specification for Mullard's SAA 5243, Apr. 1987, "Enhanced Computer Controlled Teletext Circuit".
Specification for Mullard's MAB 8031H and MAB 8051AH, Nov. 1986, "Single-Chip 8-Bit Microcomputer".
Specification for Signetics 74LS670, Dec. 1985, "Register File".
User's Manual, entitled "Computer Controlled Teletext", by J. R. Kinghorn; published by Mullard Application Laboratory; 1983.

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