Facsimile and static presentation processing – Static presentation processing – Attribute control
Patent
1978-08-02
1980-05-06
Murray, Richard
Facsimile and static presentation processing
Static presentation processing
Attribute control
H04N 953
Patent
active
042020093
ABSTRACT:
In order to stabilize the black level in the red, green or blue channel, black pulses are inserted during a blanking period and are of a level slightly higher than the black level. The resulting color signal is clamped in a first clamping circuit to a predetermined voltage during that part of the blanking period which is free of the black pulse inserted therein, and, after being processed for white compression, black clipping or gamma correction, is provided to a second clamping circuit for fixing the clamping point at a definite and preselected voltage. The black pulse level of the output from the second clamping circuit is compared with a reference voltage and, upon the result obtained, the clamp voltage of the first clamping circuit is controlled to thereby completely suppress black level variations. With this processing amplifier device, the pedestal level is adjustable by varying either the reference voltage or the level of the black pulses.
REFERENCES:
patent: 3126447 (1964-03-01), Bendell
patent: 4110787 (1978-08-01), Parker
Ushiyama Yasuichi
Yamamoto Setsuo
Murray Richard
Nippon Electric Co. Ltd.
LandOfFree
Processing amplifier for three-tube color television camera does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Processing amplifier for three-tube color television camera, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Processing amplifier for three-tube color television camera will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1007946