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

[ACTIVE]

Analysis of Sound-Film Drives

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Publisher: SMPTE — White Plains, NY, USA
Doc Type: Journal Article
Content Type: Original Research
Abbreviated Title: J SMPE
Volume: 37, No. 11, pp. 452–479
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 Filtered sprockets in combination with fixed reproducer gates were not adaptable to modern requirements and were superseded by film-driven damped impedance drums(rotary stabilizers).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
ISSN: Print: 0097-5834
Link: https://doi.org/10.5594/J01245
Author(s): W. J. Albersheim
D. MacKenzie
Copyright: © 1941 Society of Motion Picture and Television Engineers, Inc.

Bibliographic Reference(s)

1 Shea T. E. MacNair W. A. Subrizi V. : “Flutter in Sound Records,” J. Soc. Mot. Pict. Eng. , XXV (Nov., 1935 ), p. 403 . EXTERNAL
2 Drew R. O. Kellogg E. W. : “Filtering Factors of the Magnetic Drive,” J. Soc. Mot. Pict. Eng. , XXXV (Aug., 1940 ), p. 138 . EXTERNAL
3 Rowland H. A. : U. S. Pat. No. 691,667 ( 1899 ). EXTERNAL
4 Cook E. D. : “The Technical Aspects of the High-Fidelity Reproducer,” J. Soc. Mot. Pict. Eng. , XXV (Oct., 1935 ), p. 289 . EXTERNAL

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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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<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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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

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<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>
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Referenced By

Basic Principles of Stereophonic Sound [Active]
Second Installment: History of Sound Motion Pictures [Active]
Multichannel Magnetic Film Recording and Reproducing Unit [Active]
An Audio Flutter Weighting Network [Active]
Perceptibility of Flutter in Speech and Music [Active]
Flutter Index Concept [Active]
A Wide-Range Wow and Flutter Indicator [Active]