Journal of the Society of Motion Picture Engineers ( Volume: 14, Issue: 2, February 1930)

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Photographic Characteristics of Sound Recording Film

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Publisher: SMPTE — White Plains, NY, USA
Doc Type: Journal Article
Content Type: Original Research
Volume: 14, No. 2, pp. 180–203
Abstract: The various methods and general principles involved in the recording of sound by photographic methods are too well known to require detailed description and discussion. The methods at present in use commercially may be divided broadly into two classes: (1) The variable density type, and (2) the variable width type. The former may be subdivided, with respect to the method used for obtaining the variable exposure, into (a) those using the “light valve,” and (b) those employing a “flashing lamp.” In variable width recording the film is moved at a uniform linear velocity past a slit, or an optical image thereof. By suitable means the transverse length of this slit image is so modulated that the exposed area varies in lateral dimensions giving a sound record of the so-called “saw tooth” type. 9t any point within the exposed area the exposure incident on the photographic material is constant, both factors of exposure, namely, intensity (I) and time (t), being constant. This statement requires some modification since with the film moving continuously in one direction past a slit of finite width and the boundary of the illuminated area moving in a direction perpendicular to that of the film there must be a narrow envelop in which the t factor of exposure varies to some extent.
Publication Date: 1930-02-01
DOI: 10.5594/J14808
ISSN: Print: 0097-5834
Link: https://doi.org/10.5594/J14808
Author(s): Otto Sandvik
Loyd A. Jones
Copyright: © 1930 Society of Motion Picture and Television Engineers, Inc.

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Otto Sandvik and Loyd A. Jones; Photographic Characteristics of Sound Recording Film, Journal of the Society of Motion Picture Engineers ( Volume: 14, Issue: 2, February 1930); SMPTE, 1930. Available at https://doi.org/10.5594/J14808

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Otto Sandvik and Loyd A. Jones; Photographic Characteristics of Sound Recording Film, Journal of the Society of Motion Picture Engineers ( Volume: 14, Issue: 2, February 1930); SMPTE, 1930. Available at https://doi.org/10.5594/J14808

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<span class="citation">Otto Sandvik and Loyd A. Jones; <cite>Photographic Characteristics of Sound Recording Film</cite>, Journal of the Society of Motion Picture Engineers ( Volume: 14, Issue: 2, February 1930); SMPTE, 1930. Available at <a href="https://doi.org/10.5594/J14808" target="_blank" rel="noopener">https://doi.org/10.5594/J14808</a></span>

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Otto Sandvik and Loyd A. Jones; <cite id="bib-10-5594-j14808">Photographic Characteristics of Sound Recording Film</cite>, Journal of the Society of Motion Picture Engineers ( Volume: 14, Issue: 2, February 1930); SMPTE, 1930
<span class="doi">10.5594/J14808</span>
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Referenced By

Second Installment: History of Sound Motion Pictures [Active]
The Measurement of Density in Variable Density Sound Film [Active]
Some Photographic Aspects of Sound Recording [Active]
History of Sound Motion Pictures [Active]
Zero-Shift Test for Determining Optimum Density in Variable-Width Sound Recording [Active]
Progress in the Motion Picture Industry [Active]
Modulated high-frequency recording as a means of determining conditions for optimal processing [Active]