Predictable automatic brightness control circuit in a video sign

Details Predictable automatic brightness control circuit in a video sign Predictable automatic brightness control circuit in a video sign

1979-01-31

1980-05-13

Richardson, Robert L.

Facsimile and static presentation processing

Static presentation processing

Attribute control

358168, H04N 516

Patent

active

042031311

ABSTRACT:
Brightness control apparatus for a video signal image reproducing system including a video signal processing channel, a kinescope driver for supplying video signals to an image reproducing kinescope, and a source of substantially fixed potential to which signals processed by the kinescope driver are referenced. A comparator senses the substantially fixed reference potential and a blanking level which occurs during periodic blanking intervals of the video signal, and provides an output control signal indicative of the voltage difference between the reference potential and the blanking level. The control voltage is applied to the video channel for translating the blanking level in a direction to minimize the voltage difference, to thereby establish the conduction of the kinescope driver during image intervals of the video signal at a level corresponding to a desired image black level condition when such condition is manifested by the video signal.

REFERENCES:
patent: 2930843 (1960-03-01), Cooper
patent: 3588341 (1971-06-01), Hansen
patent: 3597540 (1971-08-01), MacIntyre, Jr.

Affiliated with

Also associated with

Rating

Predictable automatic brightness control circuit in a video sign does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Predictable automatic brightness control circuit in a video sign, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Predictable automatic brightness control circuit in a video sign will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-932618