Journal of the Society of Motion Picture Engineers ( Volume: 33, Issue: 12, December 1939)

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Synthetic Reverberation An Electroöptical System for Controlling the Reverberation of Sound Signals

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Publisher: SMPTE
Doc Type: Journal Article
Article Type: research-article
Abstract: An electroöptical method of producing reverberation synthetically is described. The method employed consists in recording the original program on the rim of a phosphor-coated disk by means of a modulated light-source and then picking up the continuously decaying sound images after a predetermined time interval by means of photocells. The exponential decay curve of the phosphorescent substance produces an infinite number of secondary sound impulses to which any desired decay characteristic can be applied. This reverberation signal is then mixed with the original program in the proportion required. This new reverberation device has been employed in radio broadcasting and can be used in phonograph as well as in motion picture sound recording, where the scenic effect or script requires a type of sound which, due to the deadness of the sound stage, might not readily be available. This device would replace the use of so-called echo chambers, at the same time introducing an appreciable amount of flexibility without degrading the quality of the original sound.
Publication Date: 1939-12-01
DOI: 10.5594/J01259
Link: https://doi.org/10.5594/J01259
Author(s): Peter C. Goldmark, Paul S. Hendricks

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Peter C. Goldmark and Paul S. Hendricks; Synthetic Reverberation An Electroöptical System for Controlling the Reverberation of Sound Signals, Journal of the Society of Motion Picture Engineers ( Volume: 33, Issue: 12, December 1939); SMPTE, 1939. Available at https://doi.org/10.5594/J01259

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Peter C. Goldmark and Paul S. Hendricks; Synthetic Reverberation An Electroöptical System for Controlling the Reverberation of Sound Signals, Journal of the Society of Motion Picture Engineers ( Volume: 33, Issue: 12, December 1939); SMPTE, 1939. Available at https://doi.org/10.5594/J01259

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<span class="citation">Peter C. Goldmark and Paul S. Hendricks; <cite>Synthetic Reverberation An Electroöptical System for Controlling the Reverberation of Sound Signals</cite>, Journal of the Society of Motion Picture Engineers ( Volume: 33, Issue: 12, December 1939); SMPTE, 1939. Available at <a href="https://doi.org/10.5594/J01259" target="_blank" rel="noopener">https://doi.org/10.5594/J01259</a></span>

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<li>
Peter C. Goldmark and Paul S. Hendricks; <cite id="bib-10-5594-j01259">Synthetic Reverberation An Electroöptical System for Controlling the Reverberation of Sound Signals</cite>, Journal of the Society of Motion Picture Engineers ( Volume: 33, Issue: 12, December 1939); SMPTE, 1939
<span class="doi">10.5594/J01259</span>
</li>