System for digitally transmitting and displaying data on television receiver screen
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United States of America Patent
Stats
-
Nov 30, 1982
Issued Date -
N/A
app pub date -
May 17, 1979
filing date -
Sep 6, 1976
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A teletext system for broadcast of pages of magazines to be displayed on television receiver screen. A subscriber entitled to receive a magazine can select a desired page thereof by actuating a keyboard to transmit 8-bit words belonging to two groups: first properly said character words and second function words. Among the function words, there are page flag words which indicate that a page number word follows it and make the selection possible. A row flag word is followed by a row number word to indicate the vertical address of a sequence of characters in a page. Adaptation means are provided for adapting the voltage/light characteristics, as in a current gamma correction, which permits correctly displayed logic signals.
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