Color control circuit for teletext-type decoder

Details Color control circuit for teletext-type decoder Color control circuit for teletext-type decoder

1981-05-18

1983-06-14

Martin, John C.

Facsimile and static presentation processing

Static presentation processing

Attribute control

358147, 340701, H04N 9535

Patent

active

043886396

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.

REFERENCES:
Radio Shack, Dictionary of Electronics, 1974-1975 Edition, pp. 120, 509.

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