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MANAGERS AND PROJECTIONISTS 1101
Western Electric Reproduction
ANY sound-on-the-film and the disc record method -** may use the Western Electric equipment, which is supplied and serviced by the Electric Research Products Company. Except for difference in what we may term "picking up the sound," the equipment for sound-on-thefilm and disc reproduction is identical, hence one description will serve for both, insofar as has to do with amplifiers, horns, etcetera.
Referring to Fig. 383, each line therein shown, and the shadings between is very narrow, as you may see by examining the Movietone sound track itself. Yet if the sound reproduction is to be a true reproduction of the original sound combinations, each one of these thin lines must be illuminated individually and separately as it passes over the projector sound aperture. Not only that, but each sound modulation represented by the shadings between what we may call the "lines," must be given its exactly true value.
If parts of two adjacent lines be illuminated simultaneously, or if parts of two modulations be lighted at the same time, then the reproduction will not be good. There will be a sound blur in proportion to the amount of fault.
Think that over before proceeding further. It means that the line of light illuminating the sound band must be (a) a very narrow or "thin" line vertically; it must be (b) precisely at right angles with an imaginary line drawn lengthwise through the center of the sound track.