Journal of the Society of Motion Picture Engineers ( Volume: 37, Issue: 10, October 1941)

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A Light-Valve for the Stereophonic Sound-Film System

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Publisher: SMPTE
Doc Type: Journal Article
Article Type: research-article
Abstract: This paper describes a light-valve incorporating large electromagnetic damping and operating directly through the ribbon resonance region. Resonance-region response, 5 db above that at low frequencies, is equalized by a suitable equalizer to provide uniform ribbon displacement per unit driving voltage over the band 30–14,000 cycles with very nearly constant phase-shift per cycle. Problems of structure and size have furnished a mechanical design with several interesting features, among which are mechanical robustness, protection against dirt and moisture, built-in ribbon and optical adjustments, and an optical system integral with the valve structure. This unit has proved a rugged, stable, light-modulator especially free from intermodulation products.
Publication Date: 1941-10-01
DOI: 10.5594/J09960
Link: https://doi.org/10.5594/J09960
Author(s): E. C. Wente, R. Biddulph

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E. C. Wente and R. Biddulph; A Light-Valve for the Stereophonic Sound-Film System, Journal of the Society of Motion Picture Engineers ( Volume: 37, Issue: 10, October 1941); SMPTE, 1941. Available at https://doi.org/10.5594/J09960

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E. C. Wente and R. Biddulph; A Light-Valve for the Stereophonic Sound-Film System, Journal of the Society of Motion Picture Engineers ( Volume: 37, Issue: 10, October 1941); SMPTE, 1941. Available at https://doi.org/10.5594/J09960

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<span class="citation">E. C. Wente and R. Biddulph; <cite>A Light-Valve for the Stereophonic Sound-Film System</cite>, Journal of the Society of Motion Picture Engineers ( Volume: 37, Issue: 10, October 1941); SMPTE, 1941. Available at <a href="https://doi.org/10.5594/J09960" target="_blank" rel="noopener">https://doi.org/10.5594/J09960</a></span>

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<li>
E. C. Wente and R. Biddulph; <cite id="bib-10-5594-j09960">A Light-Valve for the Stereophonic Sound-Film System</cite>, Journal of the Society of Motion Picture Engineers ( Volume: 37, Issue: 10, October 1941); SMPTE, 1941
<span class="doi">10.5594/J09960</span>
</li>