VERTICAL RESOLUTION
An electron beam scanning across a photosensitive surface of a pick-up device can be made to produce in an external circuit a time-varying electrical signal whose amplitude is at all times proportional to the illumination on the surface directly under the scanning beam. The upper frequency limit of the amplifier for such signals depends upon the velocity of the scanning beam.
Most scenes have brightness gradations in a vertical direction. The ability of a scanning beam to allow reproduction of electrical signals corresponding to these gradations may be seen to be dependent upon the number of scanning lines and not upon the velocity of the individual scanning lines. However, the two are integrally related if the picture-repetition ...
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