Teletext decoder with improved processor which determines the be

Details Teletext decoder with improved processor which determines the be Teletext decoder with improved processor which determines the be

1989-12-11

1991-02-05

Groody, James J.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

358142, H04N 704

Patent

active

049910183

ABSTRACT:
As shown in FIG. 2, a teletext decoder has a multi-page memory (MEM) comprising a plurality of memory portions (CH0 to CH3) in which individual pages can be stored on a priority basis. The numbers of selected pages are entered into page request registers (PR0 to PR3) and when the number of a selected page is detected by the relevent one of page comparators (PC0 to PC3) a found bit (FB) is produced by the relevant one of flip-flops (FB0 to FB3) and recorded in the memory portion allotted to the selected page by processor means (PM). In order to ensure that the end of a selected page can also be detected, one of the memory portions is allotted to store every page received so that a found bit is always produced at the end of a selected page stored in another memory portion. The processor means (PM) uses this latter found bit to signify detection of the end of the selected page.

REFERENCES:
D'Amato, "A Software-Oriented Dual Standard Teletext Decoder", Rev. HF (Belgium), vol. 11, #11 pp. 373-380, 1981.
British Broadcasting Corporation et al., Broadcast Teletext Specification (Sept., 1986).
U.K. Department of Trade and Industry, World System Teletext Technical Specification (March, 1985).
Specifications for the Philips MAB84XX chip.
Specifications for the Mullard SAA5230 chip.
Specifications for the Mullard SAA5240 chip.

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