VIDEO DISC
The Pioneer and Philips video disc resembles very much in its physical shape of a gramophone records, Fig. 24.3. It consists of a transparent plastic material with standardised diameters of 30 cm and 20 cm and a thickness of 1.1 mm. The most striking differences with an audio record are its mirror like appearance due to a reflective coating and the fact that it can be played on one side only. The basic difference however, lies in the structure of information. Whereas the audio disc has grooves, the walls of which are modulated with an audio signal, the video disc, in view of the requirements of a much higher information density, has tracks with a much finer information and with a spacing that is about 60 times smaller than that of ...
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