Slow-scan composite signal-producing apparatus with means for producing sync pulses by offsetting black level
阅读：921发布：2023-03-11
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1. SLOW-SCAN PICTURE SIGNAL-PRODUCING APPARATUS, COMPRISING A ROTATABLE SCANNING DRUM HAVING SPACED PERIPHERAL SCANNING WINDOW OR APERTURES IN A COMMON PLANE TRANSVERSE TO THE AXIS OF ROTATION OF SAID DRUM, MEANS FOR ROTATING SAID DRUM, MEANS FOR REPEATEDLY SLOWLY MOVING AN IMAGE TO BE SCANNED IN FRONT OF SAID APERTURES SO AS TO EFFECT SCANNING OF THE IMAGE BY SAID WINDOWS IN SUCCESSIVE LINES AND FIELDS, MEANS FOR TRANSLATING THE LIGHT PASSING THROUGH SAID WINDOWS FROM SAID IMAGE INTO AN ELECTRICAL SIGNAL, MEANS FOR PROVIDING OVER THE IMAGE AREA A CONSTANT LOW LELVEL OF ILLUMINATION, THEREBY TO ESTABLISH A "BLACK" LEVEL IN SAID SIGNAL, AND MEANS FOR INTERRUPTING THE LIGHT PASSAGE TO SAID TRANSLATING MEANS BETWEEN SUCCESSIVE LINE SCANS OF THE IMAGE, THEREBY TO PROVIDE IN SAID SIGNAL LINE SYNCHRONIZING PULSES ON THE "BLACKER" THAN BLACK" SIDE OF SAID LEVEL.
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