Journal of the Society of Motion Picture Engineers ( Volume: 52, Issue: 3, March 1949)

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Silent Playback and Public-Address System

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Publisher: SMPTE
Doc Type: Journal Article
Article Type: research-article
Abstract: The silent playback and public-address system provides a unique time-saving aid in photographing and recording dialog sequences having musical backgrounds. By means of a music- or speech-modulated 100-kilocycle transmitter, a supersonic-frequency magnetic field is generated throughout the scene area. The magnetic field includes secondary currents in concealed loops worn by the actors. These signals are demodulated in miniature batteryless units and energize small hearing-aid earphones. The earphones may be worn without concealment on distant and medium scenes. On close-ups the earphones are concealed and the sound is coupled to the ear through small plastic tubing camouflaged by make-up. Several types of loops, demodulators, and earphone units meet the varying needs of the scenes to be photographed and recorded. The stage microphone and sound-on-film recording channel is free from 100-kilocycle interference.
Publication Date: 1949-03-01
DOI: 10.5594/J12531
Link: https://doi.org/10.5594/J12531
Author(s): Bruce H. Denney, Robert J. Carr

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Bruce H. Denney and Robert J. Carr; Silent Playback and Public-Address System, Journal of the Society of Motion Picture Engineers ( Volume: 52, Issue: 3, March 1949); SMPTE, 1949. Available at https://doi.org/10.5594/J12531

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Bruce H. Denney and Robert J. Carr; Silent Playback and Public-Address System, Journal of the Society of Motion Picture Engineers ( Volume: 52, Issue: 3, March 1949); SMPTE, 1949. Available at https://doi.org/10.5594/J12531

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<span class="citation">Bruce H. Denney and Robert J. Carr; <cite>Silent Playback and Public-Address System</cite>, Journal of the Society of Motion Picture Engineers ( Volume: 52, Issue: 3, March 1949); SMPTE, 1949. Available at <a href="https://doi.org/10.5594/J12531" target="_blank" rel="noopener">https://doi.org/10.5594/J12531</a></span>

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<li>
Bruce H. Denney and Robert J. Carr; <cite id="bib-10-5594-j12531">Silent Playback and Public-Address System</cite>, Journal of the Society of Motion Picture Engineers ( Volume: 52, Issue: 3, March 1949); SMPTE, 1949
<span class="doi">10.5594/J12531</span>
</li>