Adjustable gamma controller
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United States of America Patent
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-
Mar 17, 1987
Grant Date -
N/A
app pub date -
Dec 24, 1984
filing date -
Dec 24, 1984
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A gamma corrector for a video signal includes a first amplifier, a nonlinear signal translating stage and a second amplifier coupled in cascade in the order named. A feedback network coupled between the output of the second amplifier and a gain-control input of the first amplifier derives a gain-control signal indicative of the white level of the video signal produced at the output of the second amplifier. A gamma control signal is applied to a gain control input of the second amplifier in one embodiment and to a black level clamp associated with the first amplifier stage in another embodiment.
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