Projector Noise Levels

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Publisher: SMPTE — White Plains, NY, USA
Doc Type: Journal Article
Content Type: Original Research
Abbreviated Title: J SMPTE
Volume: 68, No. 6, pp. 402–406
Abstract: Analytical and empirical tests have been made to determine optimum noise levels of photographic projectors. It is shown that to achieve 96% “intelligibility” (per cent of sentences understood) the projector should have an articulation index (a quantity related complexly to noise and frequency) greater than 0.4. The index is simple to determine when the projector noise spectrum parallels the spectrum for ordinary speech, i.e., when it peaks near 500 cycles/sec. Measurement of the index is more difficult when the spectra are nonparallel.
Publication Date: 1959-06-01
DOI: 10.5594/J13833
ISSN: Print: 0361-4573
Link: https://doi.org/10.5594/J13833
Author(s): G. E. WhitneyAmerican Machine & Foundry Co., Alexandria, Va.
M. T. BuckelewAmerican Machine & Foundry Co., Alexandria, Va.
J. F. McGraneAmerican Machine & Foundry Co., Alexandria, Va.
M. L. BaronU.S. Army Signal Equipment Support Agency, Fort Monmouth, N.J.
Copyright: © 1959 Society of Motion Picture and Television Engineers, Inc.

Bibliographic Reference(s)

1. French N. R. Steinberg J. C. , “Factors Governing the Intelligibility of Speech Sounds,” J. Acoust. Soc. Am. , 19 : 90 – 119 , Jan. 1947 . EXTERNAL
2. Reference Data for Radio Engineers , 4th ed. , International Telephone & Telegraph Corp. , New York , 1956 . EXTERNAL
3. Radiotron Designer's Handbook , ed. by Langford-Smith F. , 4th ed. , Radio Corp. of America , Harrison, N.J. , 1953 . EXTERNAL
4. Colby M. Y. , Sound Waves and Acoustics , Henry Holt & Co. , New York , 1938 . EXTERNAL
5. Handbook of Noise Measurement and Measurement of Vibration , 3rd ed. , General Radio Corp. , West Concord, Mass. , 1956 . EXTERNAL
6. Stevens S. S. Eagan J. P. Miller G. A. , “Methods of Measuring Speech Spectra,” J. Acoust. Soc. Am. , 19 : 771 – 780 , Sept. 1947 . EXTERNAL
7. Weatherburn C. E. , Mathematical Statistics , University Press , Cambridge, Mass. , 1947 . EXTERNAL

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G. E. Whitney, M. T. Buckelew, J. F. McGrane, and M. L. Baron; Projector Noise Levels, Journal of the SMPTE ( Volume: 68, Issue: 6, June 1959); SMPTE, 1959. Available at https://doi.org/10.5594/J13833

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G. E. Whitney, M. T. Buckelew, J. F. McGrane, and M. L. Baron; Projector Noise Levels, Journal of the SMPTE ( Volume: 68, Issue: 6, June 1959); SMPTE, 1959. Available at https://doi.org/10.5594/J13833

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<span class="citation">G. E. Whitney, M. T. Buckelew, J. F. McGrane, and M. L. Baron; <cite>Projector Noise Levels</cite>, Journal of the SMPTE ( Volume: 68, Issue: 6, June 1959); SMPTE, 1959. Available at <a href="https://doi.org/10.5594/J13833" target="_blank" rel="noopener">https://doi.org/10.5594/J13833</a></span>

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G. E. Whitney, M. T. Buckelew, J. F. McGrane, and M. L. Baron; Projector Noise Levels, Journal of the SMPTE ( Volume: 68, Issue: 6, June 1959); SMPTE, 1959
doi: 10.5594/J13833
url: https://doi.org/10.5594/J13833

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G. E. Whitney, M. T. Buckelew, J. F. McGrane, and M. L. Baron; <cite id="bib-10-5594-j13833">Projector Noise Levels</cite>, Journal of the SMPTE ( Volume: 68, Issue: 6, June 1959); SMPTE, 1959
<span class="doi">10.5594/J13833</span>
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Referenced By

A Comparison of Learning Resulting from Motion-Picture Projector and from Closed-Circuit TV Presentations [Active]