Improved teletext decoder which accommodates an increased number

Details Improved teletext decoder which accommodates an increased number Improved teletext decoder which accommodates an increased number

1988-07-15

1990-06-12

Groody, James J.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

358147, H04N 708

Patent

active

049337645

ABSTRACT:
A teletext decoder has a character memory comprising a common language set of characters and a plurality of sub-sets of national option characters, each of which latter sets makes up a complete national language set when combined with the common language set. The totality of characters are addressable using n bit digital codes together with an additional bit which determines one of two addressing modes. In one addressing mode, only one of the national option sub-sets can be selected by addressing means so that a page can be displayed using one complete language set. In the other addressing mode, all the national option sub-sets can be selected by processor means to enable a page to be displayed using more than one language set.

REFERENCES:
patent: 4161728 (1979-07-01), Insam
patent: 4712188 (1987-12-01), Nishiyama
BBC et al., Broadcast Teletext Specification (Sep. 1976).
IBM, "IBM Display Write/36 Tips and Techniques: Document No. G360-1002-01", pp. 25-29.
Veith, Richard H., "Televisions Teletext" 1983, Elsevier Science Publishing Co., pp. 157-161.

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