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The Film Projector-Magnetic Reproducer Double Sound System at CBS Television Broadcast Center, New York

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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JAES Volume 16 Issue 2 pp. 157-162; April 1968
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