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Journal of the Society of Motion Picture Engineers ( Volume: 29, Issue: 3, September 1937)
[ACTIVE]

A Device for Direct Reproduction from Variable-Density Sound Negatives

Metadata

Publisher
SMPTE
Doc Type
Journal Article
Article Type
research-article
Abstract
The possibility of reproducing sound directly from the negative record offers an improvement in sound quality because it avoids the deterioration of definition, waveshape, and volume range caused by the printing process. In order to eliminate the distortion inherent in variable-density sound negatives, the playback amplifier must produce the same type of compensating distortion that occurs in good straight-line prints. The theoretical circuit requirements for an amplifier of this type are derived, and the RA-222 negative playback amplifier developed by the ERPI engineering department, in accordance with these requirements, is described. In addition to the basic distortion circuit, the RA-222 amplifier satisfies practical requirements, such as self-contained power supply and adjustments for negative gamma, amplitude, and frequency characteristic. Experiences in various fields of use are reported, such as sensitometric measurements, print control, re-recording, and high-quality reproduction.
Publication Date
1937-09-01
DOI
10.5594/J17373
Link
https://doi.org/10.5594/J17373
Author(s)
W. J. Albersheim
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W. J. Albersheim; A Device for Direct Reproduction from Variable-Density Sound Negatives, Journal of the Society of Motion Picture Engineers ( Volume: 29, Issue: 3, September 1937); SMPTE, 1937. Available at https://doi.org/10.5594/J17373
Snippet:
W. J. Albersheim; A Device for Direct Reproduction from Variable-Density Sound Negatives, Journal of the Society of Motion Picture Engineers ( Volume: 29, Issue: 3, September 1937); SMPTE, 1937. Available at https://doi.org/10.5594/J17373

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W. J. Albersheim; A Device for Direct Reproduction from Variable-Density Sound Negatives, Journal of the Society of Motion Picture Engineers ( Volume: 29, Issue: 3, September 1937); SMPTE, 1937. Available at https://doi.org/10.5594/J17373
Snippet:
<span class="citation">W. J. Albersheim; <cite>A Device for Direct Reproduction from Variable-Density Sound Negatives</cite>, Journal of the Society of Motion Picture Engineers ( Volume: 29, Issue: 3, September 1937); SMPTE, 1937. Available at <a href="https://doi.org/10.5594/J17373" target="_blank" rel="noopener">https://doi.org/10.5594/J17373</a></span>

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Preview:
W. J. Albersheim; A Device for Direct Reproduction from Variable-Density Sound Negatives, Journal of the Society of Motion Picture Engineers ( Volume: 29, Issue: 3, September 1937); SMPTE, 1937
doi: 10.5594/J17373
url: https://doi.org/10.5594/J17373
Snippet:
<li>
W. J. Albersheim; <cite id="bib-10-5594-j17373">A Device for Direct Reproduction from Variable-Density Sound Negatives</cite>, Journal of the Society of Motion Picture Engineers ( Volume: 29, Issue: 3, September 1937); SMPTE, 1937
<span class="doi">10.5594/J17373</span>
</li>