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

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

1983-12-21

1985-11-12

Rubinson, Gene Z.

Facsimile and static presentation processing

Facsimile

Recording apparatus

358209, 358212, H04N 530

Patent

active

045531692

ABSTRACT:
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.

REFERENCES:
patent: 3898379 (1975-08-01), Howe et al.
patent: 3949162 (1976-04-01), Malueg
patent: 4001502 (1977-01-01), van Roessel
patent: 4232331 (1980-11-01), Motoyama et al.
patent: 4293877 (1981-10-01), Tsunekawa et al.

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