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Journal of the Society of Motion Picture Engineers ( Volume: 17, Issue: 2, August 1931)
[ACTIVE]

A Shutter for use in Reduction of Ground Noise

Metadata

Publisher
SMPTE
Doc Type
Journal Article
Article Type
research-article
Abstract
A system for reducing ground noise on variable area records was described by Townsend, McDowell, and Clark in February, 1931. The preferred method employs a shutter mounted on the recorder which intercepts part of the light and reduces the sound track to a width just sufficient at all times to accommodate, the modulation. A commercial design of shutter has been developed for this system. A motor for actuating the shutter has been designed in which an iron armature moves in a direction parallel to the pole faces so as to change the areas rather than the lengths of the air gaps. Such a motor combines the special advantages of the moving coil type, namely, long throw and stability, permitting the use of a highly flexible spring, and the advantages of the iron armature type, namely, light field structure and large winding space. Electromagnetic damping is provided. The resulting motor gives full deflection on about 20 milliamperes and has the desired speed of action. It can be attached to the optical system of the RCA Photophone type PR-4 Recorder with no operations on the latter except drilling and tapping two screw holes.
Publication Date
1931-08-01
DOI
10.5594/J08012
Link
https://doi.org/10.5594/J08012
Author(s)
E. W. Kellogg, C. N. Batsel
Source Data (JSON)

Full registry record with provenance metadata. Open directly: /api/doc/10.5594-J08012.json

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E. W. Kellogg and C. N. Batsel; A Shutter for use in Reduction of Ground Noise, Journal of the Society of Motion Picture Engineers ( Volume: 17, Issue: 2, August 1931); SMPTE, 1931. Available at https://doi.org/10.5594/J08012
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E. W. Kellogg and C. N. Batsel; A Shutter for use in Reduction of Ground Noise, Journal of the Society of Motion Picture Engineers ( Volume: 17, Issue: 2, August 1931); SMPTE, 1931. Available at https://doi.org/10.5594/J08012

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E. W. Kellogg and C. N. Batsel; A Shutter for use in Reduction of Ground Noise, Journal of the Society of Motion Picture Engineers ( Volume: 17, Issue: 2, August 1931); SMPTE, 1931. Available at https://doi.org/10.5594/J08012
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<span class="citation">E. W. Kellogg and C. N. Batsel; <cite>A Shutter for use in Reduction of Ground Noise</cite>, Journal of the Society of Motion Picture Engineers ( Volume: 17, Issue: 2, August 1931); SMPTE, 1931. Available at <a href="https://doi.org/10.5594/J08012" target="_blank" rel="noopener">https://doi.org/10.5594/J08012</a></span>

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E. W. Kellogg and C. N. Batsel; A Shutter for use in Reduction of Ground Noise, Journal of the Society of Motion Picture Engineers ( Volume: 17, Issue: 2, August 1931); SMPTE, 1931
doi: 10.5594/J08012
url: https://doi.org/10.5594/J08012
Snippet:
<li>
E. W. Kellogg and C. N. Batsel; <cite id="bib-10-5594-j08012">A Shutter for use in Reduction of Ground Noise</cite>, Journal of the Society of Motion Picture Engineers ( Volume: 17, Issue: 2, August 1931); SMPTE, 1931
<span class="doi">10.5594/J08012</span>
</li>