Facsimile and static presentation processing – Facsimile – Recording apparatus
Patent
1980-03-10
1982-03-02
Murray, Richard
Facsimile and static presentation processing
Facsimile
Recording apparatus
H04N 526
Patent
active
043181325
ABSTRACT:
An automatic exposure control apparatus for television cameras comprises a gain controlled amplifier receptive of a video signal derived from the target of the camera tube, and a modulating waveform generator which supplies a modulating signal to the control input of the gain controlled amplifier to provide amplitude modulation of the video signal. The modulated video signal is coupled to a smoothing circuit which delivers a d.c. signal corresponding in magnitude to an average value of the input signal applied thereto to an electromechanical transducer which drives an iris diaphragm to adjust the exposure setting. The modulating signal is generated in response to each pulse of either horizontal or vertical synchronization so that the video signal derived from a predetermined area of the target experiences a lower degree of amplification than that derived from the other area.
REFERENCES:
patent: 3445590 (1969-05-01), Dischert et al.
patent: 3555181 (1971-01-01), Thommen
Murray Richard
Victor Company of Japan , Limited
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