Camera pickup tube circuit for automatically suppressing excessi

Details Camera pickup tube circuit for automatically suppressing excessi Camera pickup tube circuit for automatically suppressing excessi

1977-06-02

1983-05-24

Psitos, Aristotelis M.

Facsimile and static presentation processing

Facsimile

Recording apparatus

H04N 530

Patent

active

043853234

ABSTRACT:
A circuit for suppressing the effects of excessive highlights is automatically enabled in response to highlights in the viewed scene which exceed a given threshold. The circuit is used in combination with a special pickup tube or tubes which include excessive highlight protection elements and a corresponding mode of operation. The circuit allows the continuous operation of the pickup tubes with improved resolution at a heretofore prohibitive, but preferred, high voltage level (e.g., 950 volts), rather than the generally accepted and recommended operating level (e.g., 750 volts) therefor, while prolonging the lifetime of such tubes. Detector means generates the circuit enable signal in response to the presence of highlights in excess of the given threshold. Control circuit means are conditioned thereby to drive the tube into the corresponding mode of operation during the line flyback period corresponding to the horizontal blanking interval.

REFERENCES:
patent: 3764738 (1973-10-01), Zettl et al.
patent: 3955116 (1976-05-01), van den Berg

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