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

[ACTIVE]

The Stereophonic Sound-Film System—Pre- and Post-Equalization of Compandor Systems

Metadata

Publisher: SMPTE — White Plains, NY, USA
Doc Type: Journal Article
Content Type: Original Research
Abbreviated Title: J SMPE
Volume: 37, No. 10, pp. 366–379
Abstract: In order best to fit the volume range of the program material into the volume range available in sound-film, it is generally advantageous to pre-equalize the program material before recording, and to compensate for the equalization by means of a complementary post-equalizer on reproduction. The type and amount of pre-equalization depends upon the properties of hearing and on the characteristics of the program material and the film noise. This paper discusses the relations between these quantities for systems using compandors, where the film noise varies up and down in level as the compandor gains vary. Ideally, different types of preequalization are needed for different types of program material, and a compromise must be made if a single type is to be used. The considerations leading to the choice of the pre-equalization used in the stereophonic recording and reproducing system are discussed.
Publication Date: 1941-10-01
DOI: 10.5594/J09958
ISSN: Print: 0097-5834
Link: https://doi.org/10.5594/J09958
Author(s): John C. SteinbergBell Telephone Laboratories, New York, N. Y.
Copyright: © 1941 Society of Motion Picture and Television Engineers, Inc.

Bibliographic Reference(s)

1 Sivian L. J. Dunn H. K. White S. D. : “Absolute Amplitudes and Spectra of Certain Musical Instruments and Orchestras,” J. Acoust. Soc. Amer. , II (Jan., 1931 ), p. 330 . EXTERNAL
2 Fletcher H. : “Auditory Patterns,” Rev. Modern Phys. (Jan., 1940 ), Fig. 16. EXTERNAL
3 Steinberg J. C. Montgomery H. C. Gardner M. B. : “Results of World's Fair Hearing Tests,” Bell Syst. Tech. J. , 19 (Oct., 1940 ), p. 533 (Fig. 8). EXTERNAL

Source Data (JSON)

Full registry record with provenance metadata. Open directly: /api/doc/10.5594-J09958.json

Reference Tree

Explore all references and references to this document, as a navigable tree.

Open Reference Tree

Reference this Doc

Plain text (ISO 690 compliant)

Preview:

John C. Steinberg; The Stereophonic Sound-Film System—Pre- and Post-Equalization of Compandor Systems, Journal of the Society of Motion Picture Engineers ( Volume: 37, Issue: 10, October 1941); SMPTE, 1941. Available at https://doi.org/10.5594/J09958

Snippet:

John C. Steinberg; The Stereophonic Sound-Film System—Pre- and Post-Equalization of Compandor Systems, Journal of the Society of Motion Picture Engineers ( Volume: 37, Issue: 10, October 1941); SMPTE, 1941. Available at https://doi.org/10.5594/J09958

HTML (ISO 690 compliant)

Preview:

Snippet:

<span class="citation">John C. Steinberg; <cite>The Stereophonic Sound-Film System—Pre- and Post-Equalization of Compandor Systems</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/J09958" target="_blank" rel="noopener">https://doi.org/10.5594/J09958</a></span>

SMPTE's HTML Pub

Preview:

Snippet:

<li>
John C. Steinberg; <cite id="bib-10-5594-j09958">The Stereophonic Sound-Film System—Pre- and Post-Equalization of Compandor Systems</cite>, Journal of the Society of Motion Picture Engineers ( Volume: 37, Issue: 10, October 1941); SMPTE, 1941
<span class="doi">10.5594/J09958</span>
</li>

Referenced By

History of Sound Motion Pictures [Active]
A Short History of Motion-Picture Sound Recording in the United States [Active]