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Journal of the Society of Motion Picture Engineers ( Volume: 17, Issue: 6, December 1931)
[ACTIVE]

Noise Measurement

Metadata

Publisher
SMPTE
Doc Type
Journal Article
Article Type
research-article
Abstract
The instrumental measurement of noise presents difficulties that have in the past generally defeated its successful accomplishment. While noise exists in a physical state and certain of its quantities are susceptible to direct measurement, the magnitude of a noise is evaluated through the interpretation of the human ear. The ear is non-linear in its evaluation of the various factors of noise. The degree and nature of the ear's non-linearity to the principal factors is discussed, with respect to the chief interpretative impression, that of loudness. Audiometric measurements approached a more proper evaluation of noise, but in addition to dependency upon human judgment, were only approximate, and represented comparisons of physiological effects of noise rather than true noise values. An instrument is described that measures intensity expressed in terms of loudness, evaluated for frequency and duration, and which combines portions of a complex waveshape in a suitable manner. The characteristics of the meter and the ear are compared. The readings are in decibels above a zero reference point near the threshold of audibility. The selection and meaning of this scale is explained. Where it is desired to analyze the pitch or frequency of a noise, an analyzer attachment permits either band or single-frequency analysis. Some limitations in its use in making noise measurements are discussed.
Publication Date
1931-12-01
DOI
10.5594/J07489
Link
https://doi.org/10.5594/J07489
Author(s)
S. K. Wolf, G. T. Stanton
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S. K. Wolf and G. T. Stanton; Noise Measurement, Journal of the Society of Motion Picture Engineers ( Volume: 17, Issue: 6, December 1931); SMPTE, 1931. Available at https://doi.org/10.5594/J07489
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S. K. Wolf and G. T. Stanton; Noise Measurement, Journal of the Society of Motion Picture Engineers ( Volume: 17, Issue: 6, December 1931); SMPTE, 1931. Available at https://doi.org/10.5594/J07489

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S. K. Wolf and G. T. Stanton; Noise Measurement, Journal of the Society of Motion Picture Engineers ( Volume: 17, Issue: 6, December 1931); SMPTE, 1931. Available at https://doi.org/10.5594/J07489
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<span class="citation">S. K. Wolf and G. T. Stanton; <cite>Noise Measurement</cite>, Journal of the Society of Motion Picture Engineers ( Volume: 17, Issue: 6, December 1931); SMPTE, 1931. Available at <a href="https://doi.org/10.5594/J07489" target="_blank" rel="noopener">https://doi.org/10.5594/J07489</a></span>

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S. K. Wolf and G. T. Stanton; Noise Measurement, Journal of the Society of Motion Picture Engineers ( Volume: 17, Issue: 6, December 1931); SMPTE, 1931
doi: 10.5594/J07489
url: https://doi.org/10.5594/J07489
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<li>
S. K. Wolf and G. T. Stanton; <cite id="bib-10-5594-j07489">Noise Measurement</cite>, Journal of the Society of Motion Picture Engineers ( Volume: 17, Issue: 6, December 1931); SMPTE, 1931
<span class="doi">10.5594/J07489</span>
</li>