Video preamplifier for camera operated in act mode

Details Video preamplifier for camera operated in act mode Video preamplifier for camera operated in act mode

1977-10-06

1978-07-18

Martin, John C.

Facsimile and static presentation processing

Facsimile

Recording apparatus

358184, H04N 514

Patent

active

041019326

ABSTRACT:
A video preamplifier for use in television cameras which have imaging tubes operated in an ACT mode. Circuitry is provided for sensing and amplifying the video signal without substantial interference from the large white pulses which are inherently part of the video signal of ACT operated imaging tubes. Two or more amplification stages are included with a clipping circuit interposed between them. The clipping circuit works only on relatively large signals and thus discriminately blocks the major portion of the white pulse while passing the remainder of the video signal without disturbance. Overloading problems in later amplification stages are thus substantially avoided.

REFERENCES:
patent: 3182122 (1965-05-01), Kao
patent: 3238295 (1966-03-01), Menl et al.
patent: 3341655 (1967-09-01), Vilkomerson
patent: 3700794 (1972-10-01), Loose
patent: 3764738 (1973-10-01), Zettl et al.
patent: 3927255 (1975-12-01), Yorkanis

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