Journal of the Society of Motion Picture Engineers ( Volume: 26, Issue: 2, February 1936)

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Mechanical Reversed-Bias Light-Valve Recording

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Publisher: SMPTE
Doc Type: Journal Article
Article Type: research-article
Abstract: Many methods have been applied recently for increasing the volume range of recordings. Some, such as the push-pull system, require mechanical and electrical modification of existing apparatus in order to utilize their advantages. In an effort to produce prints capable of standard reproduction, with increased signal-to-noise ratio, the mechanical reversed-bias method has been used at the Twentieth Century-Fox Film Studios. Briefly, it is a method of reverse-biasing a valve so that the valve aperture is increased by the biasing current to a degree sufficient to prevent clash. Further modification provides for a combination of standard biasing up to a certain percentage of modulation and mechanical reverse-biasing from that point on, resulting in an increase of 8 to 12 decibels over the usual methods in signal-to-noise ratio.
Publication Date: 1936-02-01
DOI: 10.5594/J08712
Link: https://doi.org/10.5594/J08712
Author(s): E. H. Hansen, C. W. Faulkner

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E. H. Hansen and C. W. Faulkner; Mechanical Reversed-Bias Light-Valve Recording, Journal of the Society of Motion Picture Engineers ( Volume: 26, Issue: 2, February 1936); SMPTE, 1936. Available at https://doi.org/10.5594/J08712

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E. H. Hansen and C. W. Faulkner; Mechanical Reversed-Bias Light-Valve Recording, Journal of the Society of Motion Picture Engineers ( Volume: 26, Issue: 2, February 1936); SMPTE, 1936. Available at https://doi.org/10.5594/J08712

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<span class="citation">E. H. Hansen and C. W. Faulkner; <cite>Mechanical Reversed-Bias Light-Valve Recording</cite>, Journal of the Society of Motion Picture Engineers ( Volume: 26, Issue: 2, February 1936); SMPTE, 1936. Available at <a href="https://doi.org/10.5594/J08712" target="_blank" rel="noopener">https://doi.org/10.5594/J08712</a></span>

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<li>
E. H. Hansen and C. W. Faulkner; <cite id="bib-10-5594-j08712">Mechanical Reversed-Bias Light-Valve Recording</cite>, Journal of the Society of Motion Picture Engineers ( Volume: 26, Issue: 2, February 1936); SMPTE, 1936
<span class="doi">10.5594/J08712</span>
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