Color control circuit for teletext-type decoder
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United States of America Patent
Stats
-
Jun 14, 1983
Grant Date -
N/A
app pub date -
May 18, 1981
filing date -
May 18, 1981
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A color control circuit for selectively modifying the red, green and blue color signals developed at the output of a teletext-type decoder comprises a common input stage responsive to the teletext decoder for developing a bi-level control voltage identifying the portions of the color signals representing background and foreground display information. Each color signal is coupled to a respective output stage which causes the associated color signal to assume a first intensity level in response to the control voltage being at its first level and a second intensity level greater than the first intensity level in response to the control voltage being at its second level. As a result, background colors are displayed at a reduced contrast level relative to foreground colors. In addition, selected single color foreground information may be displayed at a further increased intensity level to improve the readability of the display.
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