Television – Image signal processing circuitry specific to television – Dc insertion
Patent
1994-05-05
1996-04-23
Groody, James J.
Television
Image signal processing circuitry specific to television
Dc insertion
348682, 348697, 327362, H04N 516
Patent
active
055108547
ABSTRACT:
A device for adjusting a video signal so that its black level is in coincidence with a predetermined reference level includes a capacitor having a first terminal that receives the video signal and a second terminal that provides the adjusted video signal, and means for discharging the capacitor at a constant current when the adjusted video signal exceeds the reference level, and for charging the capacitor at a constant current when the adjusted video signal is below the reference level, the ratio between the charging and discharging currents ranging from 4.3 to 12.6. The device further includes means for significantly reducing the current ratio at least during a portion of a frame synchronization pulse train.
REFERENCES:
patent: 4470066 (1984-09-01), Wolber et al.
patent: 4599572 (1986-07-01), Nakayama
patent: 4811101 (1989-03-01), Yagi
patent: 4884141 (1989-11-01), Hyakutake
patent: 5027017 (1991-06-01), Fling
Patent Abstracts of Japan, vol. 12, No. 7 (E-571), Jan. 9, 1988 & JP-A-62165482 (Yokogawa Electric).
Groody James J.
Murrell Jeffrey S.
SGS-Thomson Microelectronics S.A.
LandOfFree
Device for adjusting the black level of a video signal does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Device for adjusting the black level of a video signal, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Device for adjusting the black level of a video signal will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-2312764