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

Recent Progress in Acoustics

Metadata

Publisher
SMPTE
Doc Type
Journal Article
Article Type
research-article
Abstract
Some recent developments in acoustics, especially in Germany, Russia, and in the author's laboratory, are reviewed. Experiments by E. Meyer, of Berlin, help to clarify the differences between geometrical and diffuse reflections of sound in rooms, and reveal the nature of some of the errors inherent in reverberation measurements. Meyer also describes special absorbent materials, as thin wood panelling or stretched oilcloth, which are selectively absorbent for low frequencies. S. Rschevkin, of Moscow, describes a method for prolonging, diminishing, or otherwise modifying the reverberation in a room by means of Helmholtz resonators. A new electroäcoustical device for the artificial production of vowels, by K. W. Wagner, of Berlin, is capable of generating typical German vowels that can not be distinguished from the originals. The oscillogram and sound spectrum of the artificial vowel resemble more closely the oscillogram and sound spectrum of the original vowel than do two sets of oscillograms and sound spectra of the same vowel “picked up” at two different microphone positions in the same room. The experiments reveal the nature of sound distortion caused by reflections from the boundaries of a room, and show that the ear tolerates considerable distortion. The paper concludes with a review of some recent work undertaken by the writer, including resonance in rooms, the acoustical design of broadcasting studios, and vistas in musical acoustics.
Publication Date
1937-09-01
DOI
10.5594/J17370
Link
https://doi.org/10.5594/J17370
Author(s)
V. O. Knudsen
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V. O. Knudsen; Recent Progress in Acoustics, Journal of the Society of Motion Picture Engineers ( Volume: 29, Issue: 3, September 1937); SMPTE, 1937. Available at https://doi.org/10.5594/J17370
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V. O. Knudsen; Recent Progress in Acoustics, Journal of the Society of Motion Picture Engineers ( Volume: 29, Issue: 3, September 1937); SMPTE, 1937. Available at https://doi.org/10.5594/J17370

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V. O. Knudsen; Recent Progress in Acoustics, Journal of the Society of Motion Picture Engineers ( Volume: 29, Issue: 3, September 1937); SMPTE, 1937. Available at https://doi.org/10.5594/J17370
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<span class="citation">V. O. Knudsen; <cite>Recent Progress in Acoustics</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/J17370" target="_blank" rel="noopener">https://doi.org/10.5594/J17370</a></span>

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Preview:
V. O. Knudsen; Recent Progress in Acoustics, Journal of the Society of Motion Picture Engineers ( Volume: 29, Issue: 3, September 1937); SMPTE, 1937
doi: 10.5594/J17370
url: https://doi.org/10.5594/J17370
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<li>
V. O. Knudsen; <cite id="bib-10-5594-j17370">Recent Progress in Acoustics</cite>, Journal of the Society of Motion Picture Engineers ( Volume: 29, Issue: 3, September 1937); SMPTE, 1937
<span class="doi">10.5594/J17370</span>
</li>