Clamp circuit for use in video camera having image pick-up...

Details Clamp circuit for use in video camera having image pick-up... Clamp circuit for use in video camera having image pick-up...

H - Electricity

04

N

350/47

H04N 5/228 (2006.01) H04N 5/18 (2006.01)

Patent

CA 1210138

ABSTRACT OF THE DISCLOSURE A clamp circuit is disclosed, which clamps the black level of output signal of an image pick-up section with an optical black-detecting portion in the horizontal direction provided in an ineffective picture area corresponding to the horizontal blanking interval of the output signal of the section for each horizontal scanning interval. The pulse width at least one clamp pulse immediately after the vertical blanking interval is made greater than that of the other clamp pulses, within the horizontal blanking interval.

443840

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