Video level control

Details Video level control Video level control

1988-11-22

1989-08-22

Groody, James J.

Organic compounds -- part of the class 532-570 series

Organic compounds

Phosphorus esters

358141, H04N 514

Patent

active

048601039

ABSTRACT:
An analog-to-digital converter 2 for video signals has a sensitivity (reference) input 4 controlled by a controller 10 in response to the converter's digital output so as to maintain the grey level with a predetermined range. Preferably the controller employs an irregular subsampling of the digital values, and responds differently to extreme and mid-range samples. A scale factor may be forwarded to a digital-to-analog converter for reconversion.

REFERENCES:
patent: 4625240 (1986-11-01), Yablonski et al.
patent: 4628362 (1986-12-01), Waehner
patent: 4642694 (1987-02-01), Yamagishi et al.

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