Facsimile and static presentation processing – Facsimile – Specific signal processing circuitry
Patent
1975-08-14
1977-03-22
Richardson, Robert L.
Facsimile and static presentation processing
Facsimile
Specific signal processing circuitry
178DIG5, H04N 519
Patent
active
040138330
ABSTRACT:
X-ray film images are projected onto the target plate of a video pickup tube such as a vidicon, in a video camera of the type used in closed video systems. The camera includes special circuits to compensate for the wide variation in intensity of light which will be projected from x-ray films these circuits including means for automatic brightness control and means for automatic target voltage control. The circuits for automatic brightness control include an amplification correction circuit which utilizes a portion of the amplified composite video signal to produce a DC correction voltage which is applied to the gain biasing circuit of one video amplifier stage to either increase or reduce the gain in response to the projected light, and a blanking correction circuit provides a DC correction voltage to be applied to the clamping circuit to correct the blanking pulse or pedestal amplitude in response to the amount of light projected. The target voltage control increases or reduces the target voltage in response to the projected light.
REFERENCES:
patent: 2865989 (1958-12-01), Zimmerman
patent: 3098120 (1963-07-01), Diehl
patent: 3180934 (1965-04-01), Altman
patent: 3389220 (1968-06-01), Buzan
patent: 3389221 (1968-06-01), MacDonald
patent: 3535443 (1970-10-01), Rieke
patent: 3578908 (1971-05-01), Tompkins
patent: 3600511 (1971-08-01), Cooksey
patent: 3691302 (1972-09-01), Gaebele
Coles Edward L.
Murphy Peter J.
Richardson Robert L.
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