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578
RICHARDSON'S BLUEBOOK OF PROJECTION
not convey all the details. The area surrounding the sprocket holes is made black — opaque — except for one clear, transparent section which is shown at maximum width toward the top of the sound film in Fig. 216, and at minimum width toward the bottom of that film. Where this region of the film is entirely opaque the control track photocell receives exciting light only while a sprocket hole is passing. It thus produces a 96-cycle output of maximum intensity. Where (as toward the top of the film in Fig. 216) the region between sprocket holes is partly transparent, the contrast in illumination of the photocell which accompanies the passage of a sprocket hole is less extreme. Hence the 96-cycle output of the cell is weaker. When this output is weakest it does not influence the amplification of the sound system at all. When the 96-cycle control output is at maximum strength, it produces maximum increase in the sound system's amplification.
(9) In cooperation with the sound system shown in
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Fig. 216. — Schematic diagrams of "Vitasound" system and tracks
the "block schematic" that constitutes the left-hand portion of Fig. 216, the control track effects some illusion of stereophonic sound. It will be noted, in that schematic,