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Journal of the Society of Motion Picture and Television Engineers ( Volume: 54, Issue: 3, March 1950)
[ACTIVE]

Increased Noise Reduction by Delay Networks

Metadata

Publisher
SMPTE — White Plains, NY, USA
Doc Type
Journal Article
Content Type
Original Research
Abbreviated Title
J SMPTE
Volume
54, No. 3, pp. 295–302
Abstract
This paper describes a new method of obtaining increased signal-to-noise ratio in optical sound film recording. This is done by increasing the noise reduction and is made possible by the use of delay networks which delay the application of sound currents to the modulator until after the noise-reduction-bias current has been partially canceled. Noise-reduction settings as high as 30 db have been tried with good success and settings of 15 db have been used in regular production.
Publication Date
1950-03-01
DOI
10.5594/J06357
ISSN
Print: 0898-042X
Link
https://doi.org/10.5594/J06357
Author(s)
J. R. WhitneySound Services, Inc., Hollywood, Calif.
J. W. ThatcherSound Services, Inc., Hollywood, Calif.
Copyright
© 1950 Society of Motion Picture and Television Engineers, Inc.

Bibliographic Reference(s)

  • (1) Scoville R. R. Bell W. L. , “Design and use of noise reduction bias system,” Jour. SMPE , vol. 38 , pp. 125 – 147 ; February, 1942 . EXTERNAL
  • (2) Thomsen H. M. , “New voice frequency electrical delay network,” Bell Labs Rec. , pp. 15 – 18 ; September, 1940 . EXTERNAL
  • (3) Singer Kurt , “Versatile noise-reduction amplifier,” Jour. SMPE , vol. 50 , pp. 562 ; June, 1948 . EXTERNAL
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J. R. Whitney and J. W. Thatcher; Increased Noise Reduction by Delay Networks, Journal of the Society of Motion Picture and Television Engineers ( Volume: 54, Issue: 3, March 1950); SMPTE, 1950. Available at https://doi.org/10.5594/J06357
Snippet:
J. R. Whitney and J. W. Thatcher; Increased Noise Reduction by Delay Networks, Journal of the Society of Motion Picture and Television Engineers ( Volume: 54, Issue: 3, March 1950); SMPTE, 1950. Available at https://doi.org/10.5594/J06357

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Preview:
J. R. Whitney and J. W. Thatcher; Increased Noise Reduction by Delay Networks, Journal of the Society of Motion Picture and Television Engineers ( Volume: 54, Issue: 3, March 1950); SMPTE, 1950. Available at https://doi.org/10.5594/J06357
Snippet:
<span class="citation">J. R. Whitney and J. W. Thatcher; <cite>Increased Noise Reduction by Delay Networks</cite>, Journal of the Society of Motion Picture and Television Engineers ( Volume: 54, Issue: 3, March 1950); SMPTE, 1950. Available at <a href="https://doi.org/10.5594/J06357" target="_blank" rel="noopener">https://doi.org/10.5594/J06357</a></span>

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Preview:
J. R. Whitney and J. W. Thatcher; Increased Noise Reduction by Delay Networks, Journal of the Society of Motion Picture and Television Engineers ( Volume: 54, Issue: 3, March 1950); SMPTE, 1950
doi: 10.5594/J06357
url: https://doi.org/10.5594/J06357
Snippet:
<li>
J. R. Whitney and J. W. Thatcher; <cite id="bib-10-5594-j06357">Increased Noise Reduction by Delay Networks</cite>, Journal of the Society of Motion Picture and Television Engineers ( Volume: 54, Issue: 3, March 1950); SMPTE, 1950
<span class="doi">10.5594/J06357</span>
</li>

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