Video black level reference system

Details Video black level reference system Video black level reference system

1979-02-26

1980-12-02

Safourek, Benedict V.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

358172, H04N 519

Patent

active

042374898

ABSTRACT:
A circuit and method for effecting automatic brightness control for a television receiver CRT. The video signal is AC coupled to a signal input of a comparator. The comparator also has a reference input to which is applied a viewer-adjusted reference signal. A DC output voltage is developed in response to the difference in voltages present at the signal and reference inputs. The comparator is rendered sensitive, via a Video Blanking pulse to only the luminance component and a portion of the horizontal sync component of the video signal. The Video Blanking pulse can be synthesized by phase shifting and clipping the horizontal retrace pulses.

REFERENCES:
patent: 4135209 (1979-01-01), Logan
patent: 4143398 (1979-03-01), Harwood et al.

Affiliated with

Also associated with

Rating

Video black level reference system does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Video black level reference system, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Video black level reference system will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-2287156