Journal of the Society of Motion Picture Engineers ( Volume: 25, Issue: 6, December 1935)

[ACTIVE]

Analysis of the Distortion Resulting from Sprocket-Hole Modulation

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Publisher: SMPTE — White Plains, NY, USA
Doc Type: Journal Article
Content Type: Original Research
Abbreviated Title: J SMPE
Volume: 25, No. 6, pp. 492–502
Abstract: That constancy of record speed should be sought in sound recording and reproduction has been recognized throughout the history of the art, but standards of performance have usually fallen far short. Especially have the speed variations due to sprocket-tooth action failed to receive from many engineers in the sound-picture industry the consideration which their harmful effects warrant. This is due to imperfect understanding of inherent limitations and to the fact that the impairment of sound quality is of a kind which may easily be ascribed to other causes. An analysis is made of the loss of true tones and production of spurious tones, as a result of speed modulation at sprocket-hole frequency. A recorder in which not only are disturbances of this kind eliminated, but all speed variations reduced to a minimum, has been available to the film recording industry for several years. Film phonographs, re-recording machines, and projector sound heads of which this is true are now also available, thus making possible an over-all performance which sets a new standard in the sound reproducing art.
Publication Date: 1935-12-01
DOI: 10.5594/J08729
ISSN: Print: 0097-5834
Link: https://doi.org/10.5594/J08729
Author(s): E. W. Kellogg
H. BelarRCA Manufacturing Co., Camden, N. J.
Copyright: © 1935 Society of Motion Picture and Television Engineers, Inc.

Bibliographic Reference(s)

1. Kellogg E. W. : “A New Recorder for Variable Area Recording,” J. Soc. Mot. Pict. Eng. , XV (Nov., 1930 ), p. 653 . EXTERNAL
10. Loomis F. J. Reynolds E. W. : “A New High-Fidelity Sound Head,” J. Soc. Mot. Pict. Eng. , XXV (Nov., 1935 ), No. 5 , p. 449 . EXTERNAL
11. Cook E. D. : “The Technical Aspects of the High-Fidelity Reproducer,” J. Soc. Mot. Pict. Eng. , XXV (Oct., 1935 ), No. 4 , p. 289 . EXTERNAL
2. Crabtree J. : “Sound-Film Printing—II,” J. Soc. Mot. Pict. Eng. , XXII (Feb., 1934 ), No. 2 , p. 98 . EXTERNAL
3. Lautenschlager F. : “Theoretische und Experementele Untersuchungen an Frequencz-und Phasemodulierten Schwingungen,” E. N. T. , Berlin, II (Oct., 1934 ), No. 10. EXTERNAL
4. “A Treatise on Bessel Function,” Gray & Matthews. . EXTERNAL
5. Carson J. R. : “Notes on the Theory of Modulation,” Proc. I. R. E. , 10 (Feb., 1922 ), No. 2 , p. 57 . EXTERNAL
6. Van der Pol : “Frequency Modulation,” Proc. I. R. E. , 18 (July, 1930 ), No. 7 , p. 1194 . EXTERNAL
7. Roder H. : “Amplitude, Phase, and Frequency Modulation,” Proc. I. R. E. , 19 (Dec., 1931 ), No. 12 , p. 2145 . EXTERNAL
8. Dimmick G. L. Belar H. : “Extension of the Frequency Range of Film Recording and Reproduction,” J. Soc. Mot. Pict. Eng. , XIX (Nov., 1932 ), No. 5 , p. 401 . EXTERNAL
9. Zimmerman A. G. : “Film Recorders,” J. Soc. Mot. Pict. Eng. , XX (March, 1933 ), No. 3 , p. 211 . EXTERNAL

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E. W. Kellogg and H. Belar; Analysis of the Distortion Resulting from Sprocket-Hole Modulation, Journal of the Society of Motion Picture Engineers ( Volume: 25, Issue: 6, December 1935); SMPTE, 1935. Available at https://doi.org/10.5594/J08729

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E. W. Kellogg and H. Belar; Analysis of the Distortion Resulting from Sprocket-Hole Modulation, Journal of the Society of Motion Picture Engineers ( Volume: 25, Issue: 6, December 1935); SMPTE, 1935. Available at https://doi.org/10.5594/J08729

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<span class="citation">E. W. Kellogg and H. Belar; <cite>Analysis of the Distortion Resulting from Sprocket-Hole Modulation</cite>, Journal of the Society of Motion Picture Engineers ( Volume: 25, Issue: 6, December 1935); SMPTE, 1935. Available at <a href="https://doi.org/10.5594/J08729" target="_blank" rel="noopener">https://doi.org/10.5594/J08729</a></span>

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E. W. Kellogg and H. Belar; <cite id="bib-10-5594-j08729">Analysis of the Distortion Resulting from Sprocket-Hole Modulation</cite>, Journal of the Society of Motion Picture Engineers ( Volume: 25, Issue: 6, December 1935); SMPTE, 1935
<span class="doi">10.5594/J08729</span>
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Referenced By

Second Installment: History of Sound Motion Pictures [Active]