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ournal of the Society of Motion Picture Engineers ( Volume: 15, Issue: 4, October 1930)
[ACTIVE]

Galvanometers for Variable Area Recording

Metadata

Publisher
SMPTE — White Plains, NY, USA
Doc Type
Journal Article
Content Type
Original Research
Abbreviated Title
J SMPE
Volume
15, No. 4, pp. 428–438
Abstract
In the process of recording sound on film by the variable area method, it is necessary to modulate a narrow beam of light in such manner that its length at any instant is directly proportional to the sound pressure on a microphone diaphragm. This result has been successfully accomplished in four steps as follows: (1) A microphone converts the sound energy into electrical energy. (2) An amplifier makes it possible for the microphone to control a relatively large amount of electrical energy. (3) A galvanometer converts this electrical energy into mechanical energy in the form of rotational vibrations of a small mirror. (4) An optical system enables the mirror to control the length of a small beam of light which is focused upon the film. This paper is concerned with a description of several types of galvanometers used in this process and a discussion of factors in their design.
Publication Date
1930-10-01
DOI
10.5594/J14768
ISSN
Print: 0097-5834
Link
https://doi.org/10.5594/J14768
Author(s)
G. L. Dimmick
Copyright
© 1930 Society of Motion Picture and Television Engineers, Inc.
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G. L. Dimmick; Galvanometers for Variable Area Recording, ournal of the Society of Motion Picture Engineers ( Volume: 15, Issue: 4, October 1930); SMPTE, 1930. Available at https://doi.org/10.5594/J14768
Snippet:
G. L. Dimmick; Galvanometers for Variable Area Recording, ournal of the Society of Motion Picture Engineers ( Volume: 15, Issue: 4, October 1930); SMPTE, 1930. Available at https://doi.org/10.5594/J14768

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G. L. Dimmick; Galvanometers for Variable Area Recording, ournal of the Society of Motion Picture Engineers ( Volume: 15, Issue: 4, October 1930); SMPTE, 1930. Available at https://doi.org/10.5594/J14768
Snippet:
<span class="citation">G. L. Dimmick; <cite>Galvanometers for Variable Area Recording</cite>, ournal of the Society of Motion Picture Engineers ( Volume: 15, Issue: 4, October 1930); SMPTE, 1930. Available at <a href="https://doi.org/10.5594/J14768" target="_blank" rel="noopener">https://doi.org/10.5594/J14768</a></span>

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Preview:
G. L. Dimmick; Galvanometers for Variable Area Recording, ournal of the Society of Motion Picture Engineers ( Volume: 15, Issue: 4, October 1930); SMPTE, 1930
doi: 10.5594/J14768
url: https://doi.org/10.5594/J14768
Snippet:
<li>
G. L. Dimmick; <cite id="bib-10-5594-j14768">Galvanometers for Variable Area Recording</cite>, ournal of the Society of Motion Picture Engineers ( Volume: 15, Issue: 4, October 1930); SMPTE, 1930
<span class="doi">10.5594/J14768</span>
</li>

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