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Journal of the Society of Motion Picture Engineers ( Volume: 33, Issue: 8, August 1939)
[ACTIVE]

Further Improvements in Light-Weight Record Reproducers, and Theoretical Considerations Entering into Their Design

Metadata

Publisher
SMPTE
Doc Type
Journal Article
Article Type
research-article
Abstract
Direct recording is becoming commercially more and more important. Acetate blanks are used for high-quality recordings, hut these materials are essentially softer than pressed records, and therefore nuke necessary new considerations in the design of high-quality pick-up to be used with them. It is shown that a dynamic stylus pressure of approximately 25 grams is the maximum force that acetate can tolerate without permanent deformation of the modulated grooves, even when due consideration is given to the proper matching of stiffness and inertia of the vibratory system of the pick-up. A simple formula is given for the most suitable condition of the mulching of inertia and stiffness for a complex wave-form. Other factors that interfere 7vith the construction of a light pick-up, such as uneven record and turntable surfaces, are explained, and suggestions are made for the reduction of these effects. The advantages of “constant amplitude” as a method of recording and reproduction are shown, and constant amplitude system is demonstrated.
Publication Date
1939-08-01
DOI
10.5594/J11968
Link
https://doi.org/10.5594/J11968
Author(s)
A. L. Williams
Source Data (JSON)

Full registry record with provenance metadata. Open directly: /api/doc/10.5594-J11968.json

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A. L. Williams; Further Improvements in Light-Weight Record Reproducers, and Theoretical Considerations Entering into Their Design, Journal of the Society of Motion Picture Engineers ( Volume: 33, Issue: 8, August 1939); SMPTE, 1939. Available at https://doi.org/10.5594/J11968
Snippet:
A. L. Williams; Further Improvements in Light-Weight Record Reproducers, and Theoretical Considerations Entering into Their Design, Journal of the Society of Motion Picture Engineers ( Volume: 33, Issue: 8, August 1939); SMPTE, 1939. Available at https://doi.org/10.5594/J11968

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A. L. Williams; Further Improvements in Light-Weight Record Reproducers, and Theoretical Considerations Entering into Their Design, Journal of the Society of Motion Picture Engineers ( Volume: 33, Issue: 8, August 1939); SMPTE, 1939. Available at https://doi.org/10.5594/J11968
Snippet:
<span class="citation">A. L. Williams; <cite>Further Improvements in Light-Weight Record Reproducers, and Theoretical Considerations Entering into Their Design</cite>, Journal of the Society of Motion Picture Engineers ( Volume: 33, Issue: 8, August 1939); SMPTE, 1939. Available at <a href="https://doi.org/10.5594/J11968" target="_blank" rel="noopener">https://doi.org/10.5594/J11968</a></span>

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Preview:
A. L. Williams; Further Improvements in Light-Weight Record Reproducers, and Theoretical Considerations Entering into Their Design, Journal of the Society of Motion Picture Engineers ( Volume: 33, Issue: 8, August 1939); SMPTE, 1939
doi: 10.5594/J11968
url: https://doi.org/10.5594/J11968
Snippet:
<li>
A. L. Williams; <cite id="bib-10-5594-j11968">Further Improvements in Light-Weight Record Reproducers, and Theoretical Considerations Entering into Their Design</cite>, Journal of the Society of Motion Picture Engineers ( Volume: 33, Issue: 8, August 1939); SMPTE, 1939
<span class="doi">10.5594/J11968</span>
</li>