A Portable 16 mm. Sound Picture System

This paper describes a portable sound-on-disk reproducing system developed for the Western Electric Company by Bell Telephone Laboratories. This system has been developed to permit the introduction of the sound picture into fields not readily reached by theater reproducing systems, e. g., the classroom and the lecture hall. Pictures are projected from 16 millimeter film at the rate of 24 frames per second in synchronism with the reproduction of sound from a 33 1/3 rpm. disk record. — Two main units make up the system, a portable projector-turntable unit and a portable amplifier-loud speaker unit. The projector head, turntable, electrical reproducer, and driving mechanism are comprised in the portable projector-turntable unit. The electrical energy delivered by the reproducer is delivered to the portable amplifier- loud speaker unit, which serves to amplify and convert it into sufficient acoustical energy for instructing or entertaining audiences of several hundred persons. The system derives its power from the usual house-lighting circuits.

Print ISSN

0097-5834

Published

1932-09

Content type

Original Research

DOI

10.5594/J14757