Circuit for stabilizing the black level in an output signal of a camera tube in a color television camera
 A circuit for stabilizing the black level in an output signal of a camera tube is employed in a color television camera. The camera tube has an optical filter with an optically black part extending in parallel with a beam scanning direction of the camera tube. The stabilizing circuit comprises a clamping circuit for clamping an output signal of the camera tube during a horizontal beam blanking period and for restoring a DC component of the output signal. A circuit responds to supplied sampling pulses during every vertical scanning period, for sampling and holding an output signal of the clamping circuit. A circuit feeds back a substantially negative holding voltage of the sampling and holding circuit, to the clamping circuit. 
Victor Company of Japan, Ltd.
H
H04N
inventional
Koichiro Tadayoshi Shintaro Itsuo Kenichi Sumio
Motoyama Miyoshi Nakagaki Takanashi Miyazaki Yokokawa