Journal of the Society of Motion Picture Engineers ( Volume: 45, Issue: 3, September 1945)

[ACTIVE]

Some Practical Aspects of the Intermodulation Test

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Publisher: SMPTE — White Plains, NY, USA
Doc Type: Journal Article
Content Type: Original Research
Abbreviated Title: J SMPE
Volume: 45, No. 3, pp. 161–170
Abstract: The intermodulation test provides a measure of the distortion introduced by a sound system through its failure to reproduce two or more frequencies without interaction between them. The principles underlying the measurement of intermodulation are described, and procedures for testing both negative and positive films are outlined. Results representative of both standard and experimental stocks and processing are given. The interpretation of various families of intermodulation versus print density curves in terms of film characteristics is discussed. Test modifications required by the introduction of noise reduction bias and results obtained under such conditions are described. Application of the intermodulation test to 16-mm films is shown to require no fundamental change in the test procedure.
Publication Date: 1945-09-01
DOI: 10.5594/J12834
ISSN: Print: 0097-5834
Link: https://doi.org/10.5594/J12834
Author(s): E. MeschterResearch Division, Photo Products Department, E. I. du Pont de Nemours and Co., Parlin, N. J.
Copyright: © 1945 Society of Motion Picture and Television Engineers, Inc.

Bibliographic Reference(s)

1. Frayne J. G. Scoville R. R. : “Analysis and Measurement of Distortion in Variable-Density Recording,” J. Soc. Mot. Pict. Eng. , XXXII , 6 (June, 1939 ), p. 648 . EXTERNAL
2. Hilliard J. K. : “Distortion Tests by the Intermodulation Method,” Proc. I. R. E. , 29 , 12 (Dec., 1941 ), p. 614 . EXTERNAL

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E. Meschter; Some Practical Aspects of the Intermodulation Test, Journal of the Society of Motion Picture Engineers ( Volume: 45, Issue: 3, September 1945); SMPTE, 1945. Available at https://doi.org/10.5594/J12834

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E. Meschter; Some Practical Aspects of the Intermodulation Test, Journal of the Society of Motion Picture Engineers ( Volume: 45, Issue: 3, September 1945); SMPTE, 1945. Available at https://doi.org/10.5594/J12834

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<span class="citation">E. Meschter; <cite>Some Practical Aspects of the Intermodulation Test</cite>, Journal of the Society of Motion Picture Engineers ( Volume: 45, Issue: 3, September 1945); SMPTE, 1945. Available at <a href="https://doi.org/10.5594/J12834" target="_blank" rel="noopener">https://doi.org/10.5594/J12834</a></span>

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E. Meschter; Some Practical Aspects of the Intermodulation Test, Journal of the Society of Motion Picture Engineers ( Volume: 45, Issue: 3, September 1945); SMPTE, 1945
doi: 10.5594/J12834
url: https://doi.org/10.5594/J12834

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<li>
E. Meschter; <cite id="bib-10-5594-j12834">Some Practical Aspects of the Intermodulation Test</cite>, Journal of the Society of Motion Picture Engineers ( Volume: 45, Issue: 3, September 1945); SMPTE, 1945
<span class="doi">10.5594/J12834</span>
</li>