Journal of the Society of Motion Picture Engineers ( Volume: 37, Issue: 10, October 1941)

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The Stereophonic Sound-Film System—General Theory

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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. 10, pp. 331–352
Abstract: The general requirements are discussed for an ideal recording-reproducing system as determined by the characteristics of hearing of a typical group of persons listening in a typical concert hall or theater. Quantitative values are set down as ideal objectives. Although microphones, loud speakers, and amplifiers which had been developed for the stereophonic transmission system were available for meeting these objectives, no recording medium was known which would record the wide dynamic range of intensity levels which the objectives indicated was necessary. However, this wide intensity range objective was met by using a compandor in the electrical system. A general discussion is given of the reasons for choosing the particular compandor used, for using variable-area rather than variable-density on the recorded film, for using three instead of a greater or lesser number of channels. A general description of the stereophonic sound-film system is given, including the enhancement feature. This feature makes it possible to re-record from the original recording, at the same time making any desirable changes in the dynamic range or frequency response in each of the three channels.
Publication Date: 1941-10-01
DOI: 10.5594/J09956
ISSN: Print: 0097-5834
Link: https://doi.org/10.5594/J09956
Author(s): Harvey FletcherBell Telephone Laboratories, New York, N. Y.
Copyright: © 1941 Society of Motion Picture and Television Engineers, Inc.

Bibliographic Reference(s)

1 A symposium of six papers on “Auditory Perpsective,” Electrical Engineering , LIII (Jan., 1934 ), p. 9 ; Bell Syst. Tech. J., XIII (April, 1934), p. 239. EXTERNAL
2 Steinberg J. C. Montgomery H. C. Gardner M. B. : “Results of the World's Fair Hearing Tests,” J. Acoust. Soc. Amer. , XII (Oct., 1940 ), p. 291; Bell Syst. Tech. J., XIX (Oct., 1940), p. 533 . EXTERNAL
3 Seacord D. F. : “Room Noise at Subscribers’ Telephone Locations,” J. Acoust. Soc. Amer. , XII (July, 1940 ), p. 183 . EXTERNAL
4 Hoth Daniel F. : “Room Noise Spectra at Subscribers’ Telephone Locations,” J. Acoust. Soc. Amer. , XII (April, 1941 ), p. 499 . EXTERNAL
5 Fletcher Harvey Múnson W. A. : “Relation between Loudness and Masking,” J. Acoust. Soc. Amer. , IX (July, 1937 ), p. 9 . EXTERNAL
6 Mueller W. A. : “Audience Noise as a Limitation to the Permissible Volume Range of Dialog in Sound Motion Pictures,” J. Soc. Mot. Pict. Eng. , XXXV (July, 1940 ), p. 48 . EXTERNAL

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Harvey Fletcher; The Stereophonic Sound-Film System—General Theory, Journal of the Society of Motion Picture Engineers ( Volume: 37, Issue: 10, October 1941); SMPTE, 1941. Available at https://doi.org/10.5594/J09956

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Harvey Fletcher; The Stereophonic Sound-Film System—General Theory, Journal of the Society of Motion Picture Engineers ( Volume: 37, Issue: 10, October 1941); SMPTE, 1941. Available at https://doi.org/10.5594/J09956

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<span class="citation">Harvey Fletcher; <cite>The Stereophonic Sound-Film System—General Theory</cite>, Journal of the Society of Motion Picture Engineers ( Volume: 37, Issue: 10, October 1941); SMPTE, 1941. Available at <a href="https://doi.org/10.5594/J09956" target="_blank" rel="noopener">https://doi.org/10.5594/J09956</a></span>

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Harvey Fletcher; The Stereophonic Sound-Film System—General Theory, Journal of the Society of Motion Picture Engineers ( Volume: 37, Issue: 10, October 1941); SMPTE, 1941
doi: 10.5594/J09956
url: https://doi.org/10.5594/J09956

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<li>
Harvey Fletcher; <cite id="bib-10-5594-j09956">The Stereophonic Sound-Film System—General Theory</cite>, Journal of the Society of Motion Picture Engineers ( Volume: 37, Issue: 10, October 1941); SMPTE, 1941
<span class="doi">10.5594/J09956</span>
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