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Journal of the Society of Motion Picture Engineers ( Volume: 36, Issue: 4, April 1941)
[ACTIVE]

A 200-MIL Variable-Area Modulator

Metadata

Publisher
SMPTE
Doc Type
Journal Article
Article Type
research-article
Abstract
A modulator using a new vibrating-mirror unit has been developed for recording double-width variable-area sound-track. The noise-reduction shutter is at the slit, making it possible to record, with noise-reduction, class A push-pull track comprising two standard bilateral tracks, one of which is located in accordance with the dimensional standards for single track. While this has been its principal use to date, it is readily adaptable for other types of track. A visual monitor shows operation of the noise-reduction shutter and the amplitude of signal modulation in both directions from the base-line with a positive indication of peak over-load. An exposure meter is included to serve as a check on lamp current and track balance. The light-source is a tungsten filament lamp which will properly expose fine-grain emulsions to “white” light or standard emulsions through an ultraviolet filter.
Publication Date
1941-04-01
DOI
10.5594/J12910
Link
https://doi.org/10.5594/J12910
Author(s)
R. W. Benfer, G. T. Lorance
Source Data (JSON)

Full registry record with provenance metadata. Open directly: /api/doc/10.5594-J12910.json

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R. W. Benfer and G. T. Lorance; A 200-MIL Variable-Area Modulator, Journal of the Society of Motion Picture Engineers ( Volume: 36, Issue: 4, April 1941); SMPTE, 1941. Available at https://doi.org/10.5594/J12910
Snippet:
R. W. Benfer and G. T. Lorance; A 200-MIL Variable-Area Modulator, Journal of the Society of Motion Picture Engineers ( Volume: 36, Issue: 4, April 1941); SMPTE, 1941. Available at https://doi.org/10.5594/J12910

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Preview:
R. W. Benfer and G. T. Lorance; A 200-MIL Variable-Area Modulator, Journal of the Society of Motion Picture Engineers ( Volume: 36, Issue: 4, April 1941); SMPTE, 1941. Available at https://doi.org/10.5594/J12910
Snippet:
<span class="citation">R. W. Benfer and G. T. Lorance; <cite>A 200-MIL Variable-Area Modulator</cite>, Journal of the Society of Motion Picture Engineers ( Volume: 36, Issue: 4, April 1941); SMPTE, 1941. Available at <a href="https://doi.org/10.5594/J12910" target="_blank" rel="noopener">https://doi.org/10.5594/J12910</a></span>

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Preview:
R. W. Benfer and G. T. Lorance; A 200-MIL Variable-Area Modulator, Journal of the Society of Motion Picture Engineers ( Volume: 36, Issue: 4, April 1941); SMPTE, 1941
doi: 10.5594/J12910
url: https://doi.org/10.5594/J12910
Snippet:
<li>
R. W. Benfer and G. T. Lorance; <cite id="bib-10-5594-j12910">A 200-MIL Variable-Area Modulator</cite>, Journal of the Society of Motion Picture Engineers ( Volume: 36, Issue: 4, April 1941); SMPTE, 1941
<span class="doi">10.5594/J12910</span>
</li>