Journal of the Society of Motion Picture Engineers ( Volume: 31, Issue: 6, December 1938)

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A Method for Determining the Scanning Loss in Sound Optical Systems

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Publisher: SMPTE — White Plains, NY, USA
Doc Type: Journal Article
Content Type: Original Research
Abbreviated Title: J SMPE
Volume: 31, No. 6, pp. 586–603
Abstract: The usual methods of evaluating the frequency characteristic of sound records have been satisfactory for the determination of the required correction for overall losses. However, the losses due to aperture and optical effects are not known with sufficient precision to permit an inferior limit to be assigned to film loss only. The method described was chosen in connection with a high-fidelity development and consists of comparing direct measurements made on images formed by contact printing a geometrically shaped test-object on the film with measurements of frequency records made using the recorder optical system. While the results obtained cannot be applied general1y as yet, due to the difficulty of correcting for variations in slit illumination. and for different gammas, the method is capable of segregating film loss from other losses for the specific conditions under which the test is conducted.
Publication Date: 1938-12-01
DOI: 10.5594/J17345
ISSN: Print: 0097-5834
Link: https://doi.org/10.5594/J17345
Author(s): E. D. Cook
V. C. Hall
Copyright: © 1938 Society of Motion Picture and Television Engineers, Inc.

Bibliographic Reference(s)

1 Baker J. O. Robinson D. H. : “Modulated High-Frequency Recording as a Means of Determining Conditions for Optimal Processing.” J. SOG. Mot. Pict. Eng. , XXX (Jan., 1938 ), No. 1 . p. 3 . EXTERNAL
2 Jones L. A. Russell M. E. Beacham H. R. : “A Developing Machine for Sensitometric Work,” J. Soc. Mot. Pict. Eng. , XXVIII (Jan., 1937 ), No. 1 , p. 73 . EXTERNAL
3 Sandvik O. Hall V. C. : “Wave-Form Analysis of Variable-Density Sound-Records,” J. Soc. Mot. Pict. Eng. , XIX (Oct., 1932 ), No. 4 , p. 346 . EXTERNAL
4 Sandvik O. Hall V. C. Streiffert J. : “Wave-Form Analysis of Variable-Width Sound-Records,” J. Soc Mot. Pict. Eng. , XXI (Oct., 1933 ), No. 4 , p. 323 . EXTERNAL
5 Sandvik O. Hall V. C. Grimwood W. K. : “Further Investigation of Ground-Noise in Photographic Sound-Records,” J. SOCM. ot. Pict. Eng. , XXII (I‘eb., 1934 ), No. 2 , p. 83 . EXTERNAL

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E. D. Cook and V. C. Hall; A Method for Determining the Scanning Loss in Sound Optical Systems, Journal of the Society of Motion Picture Engineers ( Volume: 31, Issue: 6, December 1938); SMPTE, 1938. Available at https://doi.org/10.5594/J17345

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E. D. Cook and V. C. Hall; A Method for Determining the Scanning Loss in Sound Optical Systems, Journal of the Society of Motion Picture Engineers ( Volume: 31, Issue: 6, December 1938); SMPTE, 1938. Available at https://doi.org/10.5594/J17345

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<span class="citation">E. D. Cook and V. C. Hall; <cite>A Method for Determining the Scanning Loss in Sound Optical Systems</cite>, Journal of the Society of Motion Picture Engineers ( Volume: 31, Issue: 6, December 1938); SMPTE, 1938. Available at <a href="https://doi.org/10.5594/J17345" target="_blank" rel="noopener">https://doi.org/10.5594/J17345</a></span>

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E. D. Cook and V. C. Hall; <cite id="bib-10-5594-j17345">A Method for Determining the Scanning Loss in Sound Optical Systems</cite>, Journal of the Society of Motion Picture Engineers ( Volume: 31, Issue: 6, December 1938); SMPTE, 1938
<span class="doi">10.5594/J17345</span>
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