Clamp circuit with feed back

Details Clamp circuit with feed back Clamp circuit with feed back

1987-06-25

1988-05-03

Chin, Tommy P.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

358171, H04N 518

Patent

active

047423927

ABSTRACT:
A clamp circuit comprising: a clamp circuit for clamping an input video signal to a predetermined clamp level in the interval corresponding to a first gate signal; a clamp level forming device for extracting a signal after it is clamped in the interval corresponding to a second gate signal, thereby forming the clamp level; and a signal generating circuit for outputting the first and second gate signals in the black level interval in the signal so that the trailing edge of the first gate signal is time-delayed relative to the trailing edge of the second gate signal. With this clamp circuit, the stable black level can be obtained, so that an image pickup camera in which the clamping characteristic was improved is realized.

REFERENCES:
patent: 3308235 (1967-03-01), Greiner
patent: 3521177 (1970-07-01), Niet
patent: 4369466 (1983-01-01), Matsuzaki
patent: 4415929 (1983-11-01), Yoshisato

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