Journal of the Society of Motion Picture Engineers ( Volume: 47, Issue: 5, November 1946)

[ACTIVE]

A New Method of Counteracting Noise in Sound Film Reproduction

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Publisher: SMPTE — White Plains, NY, USA
Doc Type: Journal Article
Content Type: Original Research
Abbreviated Title: J SMPE
Volume: 47, No. 5, pp. 426–440
Abstract: Reproduction of the sound recorded on sound film is usually accomplished by means of a narrow beam of light thrown upon the film in a direction perpendicular to that in which the sound track is moving. The fluctuations in the light flux passed through are converted into sound. With this method a noise results which is caused by the fact that part of the light passed through is intercepted by specks of dust, scratches, etc., on the sound track, especially when the film has already been used several times. This article describes a method of counteracting this noise in cases where the sound is recorded as so-called amplitude writing. The beam of light is replaced by a series of equidistant light spots moving with great velocity perpendicular to the sound track. In addition to the theoretical fundamentals of the method, a practical form of application is also discussed.
Publication Date: 1946-11-01
DOI: 10.5594/J12769
ISSN: Print: 0097-5834
Link: https://doi.org/10.5594/J12769
Author(s): W. K. Westmijze
Copyright: © 1946 Society of Motion Picture and Television Engineers, Inc.

Bibliographic Reference(s)

1 For a description of the Philips Miller system, see Philips Tech. Rev. , 1 ( 1936 ), pp. 107 , 135 , 211 . EXTERNAL
2 Schouten J. F. : “Synthetic Sound,” Philips Tech. Rev. , 4 , ( 1939 ), p. 167 . EXTERNAL
3 Cf. also Philips Tech. Rev. , 5 ( 1940 ), p. 61 . EXTERNAL

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W. K. Westmijze; A New Method of Counteracting Noise in Sound Film Reproduction, Journal of the Society of Motion Picture Engineers ( Volume: 47, Issue: 5, November 1946); SMPTE, 1946. Available at https://doi.org/10.5594/J12769

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W. K. Westmijze; A New Method of Counteracting Noise in Sound Film Reproduction, Journal of the Society of Motion Picture Engineers ( Volume: 47, Issue: 5, November 1946); SMPTE, 1946. Available at https://doi.org/10.5594/J12769

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<span class="citation">W. K. Westmijze; <cite>A New Method of Counteracting Noise in Sound Film Reproduction</cite>, Journal of the Society of Motion Picture Engineers ( Volume: 47, Issue: 5, November 1946); SMPTE, 1946. Available at <a href="https://doi.org/10.5594/J12769" target="_blank" rel="noopener">https://doi.org/10.5594/J12769</a></span>

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<li>
W. K. Westmijze; <cite id="bib-10-5594-j12769">A New Method of Counteracting Noise in Sound Film Reproduction</cite>, Journal of the Society of Motion Picture Engineers ( Volume: 47, Issue: 5, November 1946); SMPTE, 1946
<span class="doi">10.5594/J12769</span>
</li>