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Journal of the Society of Motion Picture Engineers ( Volume: 37, Issue: 11, November 1941)
[ACTIVE]

Analysis of Sound-Film Drives

Metadata

Publisher
SMPTE
Doc Type
Journal Article
Article Type
research-article
Abstract
In order to avoid audible flutter, the velocity of sound-films past the scanning light-beam must not vary more than about 0.1 per cent. Such precision can not be obtained solely by constant speed motors and high-quality gears. Mechanical filters must suppress the “drive side” disturbances originating in motor, gear-train, and sprocket-teeth, and the “load side” disturbances due to variations in the film and in the friction load. Early designs filtered only the drive-shaft rotation and steadied the film by recording on a large sprocket drum. Filtered sprockets in combination with fixed reproducer gates were not adaptable to modern requirements and were superseded by film-driven damped impedance drums(rotary stabilizers). The recommended design avoids the troublesome inner flywheel bearings by a liquid stabilizer and overcomes the uncertain filtering properties of film compliance by means of elastic driving sprockets.
Publication Date
1941-11-01
DOI
10.5594/J01245
Link
https://doi.org/10.5594/J01245
Author(s)
W. J. Albersheim, D. MacKenzie
Source Data (JSON)

Full registry record with provenance metadata. Open directly: /api/doc/10.5594-J01245.json

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W. J. Albersheim and D. MacKenzie; Analysis of Sound-Film Drives, Journal of the Society of Motion Picture Engineers ( Volume: 37, Issue: 11, November 1941); SMPTE, 1941. Available at https://doi.org/10.5594/J01245
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W. J. Albersheim and D. MacKenzie; Analysis of Sound-Film Drives, Journal of the Society of Motion Picture Engineers ( Volume: 37, Issue: 11, November 1941); SMPTE, 1941. Available at https://doi.org/10.5594/J01245

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W. J. Albersheim and D. MacKenzie; Analysis of Sound-Film Drives, Journal of the Society of Motion Picture Engineers ( Volume: 37, Issue: 11, November 1941); SMPTE, 1941. Available at https://doi.org/10.5594/J01245
Snippet:
<span class="citation">W. J. Albersheim and D. MacKenzie; <cite>Analysis of Sound-Film Drives</cite>, Journal of the Society of Motion Picture Engineers ( Volume: 37, Issue: 11, November 1941); SMPTE, 1941. Available at <a href="https://doi.org/10.5594/J01245" target="_blank" rel="noopener">https://doi.org/10.5594/J01245</a></span>

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Preview:
W. J. Albersheim and D. MacKenzie; Analysis of Sound-Film Drives, Journal of the Society of Motion Picture Engineers ( Volume: 37, Issue: 11, November 1941); SMPTE, 1941
doi: 10.5594/J01245
url: https://doi.org/10.5594/J01245
Snippet:
<li>
W. J. Albersheim and D. MacKenzie; <cite id="bib-10-5594-j01245">Analysis of Sound-Film Drives</cite>, Journal of the Society of Motion Picture Engineers ( Volume: 37, Issue: 11, November 1941); SMPTE, 1941
<span class="doi">10.5594/J01245</span>
</li>