Automatic kinescope biasing system with increased interference i

Details Automatic kinescope biasing system with increased interference i Automatic kinescope biasing system with increased interference i

1980-03-27

1981-07-07

Murray, Richard

Facsimile and static presentation processing

Static presentation processing

Attribute control

358 34, 358165, H04N 9535

Patent

active

042777984

ABSTRACT:
Apparatus is disclosed in a video signal processing system for automatically monitoring and controlling the blanking (black) current level of an image reproducing kinescope having cathode and grid intensity control electrodes. When cathode blanking current is monitored, a reference voltage is applied to the cathode over the entire monitoring interval, and an auxiliary voltage is applied to the grid electrode during a portion of the monitoring interval. A version of the grid voltage appears as an induced cathode output voltage proportional to the level of cathode blanking current conduction. A voltage responsive sensing network coupled to the cathode provides an output voltage proportional to the difference in cathode current conducted over the monitoring interval. This voltage is processed by a sampling network to produce a control voltage for modifying the cathode bias in a direction to produce the desired cathode blanking current level at or in the vicinity of kinescope cut-off. The sampling network includes two similar time sequential sample and hold circuits. The first circuit samples the induced cathode output voltage, and the second circuit subsequently samples the cathode reference voltage. The sampled voltages are differentially processed to remove unwanted common mode interference signals from the control voltage.

REFERENCES:
patent: 3558817 (1971-01-01), Van den Avoort et al.
patent: 4012775 (1977-03-01), Smith

Affiliated with

Also associated with

Rating

Automatic kinescope biasing system with increased interference i does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Automatic kinescope biasing system with increased interference i, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Automatic kinescope biasing system with increased interference i will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-196682