A double sound system enables magnetic sound to be reproduced on a playback device (dubber) which is synchronized to a film projector`s picture output. Both drive motors are powered from a common source and synchronized through belt-driven selsyns. Eight projectors and four dubbers comprise the system, with expansion capabilities for three additional projectors and two dubbers. A switching system interconnects any four of the 32 possible synchronization combinations and simultaneously routes each dubber`s sound output into the appropriate projector`s sound circuits. The system has been found especially useful for newscasts and documentary programs.
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