04213124 is referenced by 116 patents and cites 10 patents.

In the disclosed teletext system, the transmitter station broadcasts data cks data from several channels, the data packs being time multiplexed. Each data pack comprises a prefix signal for causing a teletext receiver either to accept the data packs of a selected channel or to reject data packs from other channels. In addition to the prefix, and possibly page flags followed by page numbers and row flags followed by row numbers, the sequence of eight-bit words, transmitted in a pack, may comprise escape eight-bit words which are followed by type identity eight-bit words, themselves followed by a sequence of characters to be displayed in the same type the identity of which is determined by the preceding type identity eight-bit words. Each teletext receiver comprises, a first conventional random access memory storing the coded characters, a second random access memory storing the type identity eight-bit words at the same addresses as those of the characters belonging to the sequence in the first random access memory. A read operation from the first random access memory, for display purpose, is performed at the same time as the read operation from the second random access memory. The output signals of the second memory select a character generator which includes a permanent memory which reads out the shape of those characters which read out from the first random access memory.

Title
System for digitally transmitting and displaying texts on television screen
Application Number
5/833157
Publication Number
4213124
Application Date
September 14, 1977
Publication Date
July 15, 1980
Inventor
Alain Poignet
Rennes
FR
Bernard Marti
Noyal sur Vilaine
FR
Roger Brusq
Betton
FR
Jean F Barda
Gentilly
FR
Agent
Laff Whitesel & Rockman
Assignee
L Etat Francais
FR
Etablissement Public de Diffusion dit Telediffusion de France
FR
IPC
G06F 3/14
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