A monoscope was a special form of video camera tube which displayed a single still video image. The image was built into the tube, hence the name. The tube resembled a small cathode ray tube (CRT). Monoscopes were used beginning in the 1950s to generate TV test patterns and station logos. This type of test card generation system was technologicall...
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an electron-beam tube capable of providing a picture signal derived from a fixed given image on an electrode inside the tube
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