Journal of the Society of Motion Picture Engineers ( Volume: 15, Issue: 4, October 1930)

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Conditions under Which Residual Sound in Reverberant Rooms May have More than one Rate of Decay

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Publisher: SMPTE — White Plains, NY, USA
Doc Type: Journal Article
Content Type: Original Research
Abbreviated Title: J SMPE
Volume: 15, No. 4, pp. 528–549
Abstract: Architectural acoustics was placed on a scientific basis by the late Professor Wallace C. Sabine of Harvard University. Almost his first step was to establish experimentally the facts that “the duration of audibility of the residual sound is nearly the same in all parts of an auditorium;” that it is “nearly independent of the position of the source;” and that “the efficiency of an absorbent in reducing the duration of the residual sound is, under ordinary circumstances, nearly independent of its position.”<sup>1</sup> As his statements imply, Sabine certainly did not expect these principles to hold under all conditions. But since he calculated the reverberation time from the time required for the sound to decay from its initial intensity to the threshold intensity his method could not bring to light the presence of more than one rate of decay, and thus he may not have been aware of this added exception to the idealizations he proposed.
Publication Date: 1930-10-01
DOI: 10.5594/J14778
ISSN: Print: 0097-5834
Link: https://doi.org/10.5594/J14778
Author(s): Carl F. Eyring
Copyright: © 1930 Society of Motion Picture and Television Engineers, Inc.

Bibliographic Reference(s)

1 Sabine Wallace C. : “Collected Papers,” pp. 18 , 104 . EXTERNAL
2 Eyring Carl F. : J. Acoustical Soc. Amer. , I (January, 1930 ), No. 2 , p. 236 . EXTERNAL
3 Wente Bedell : “Chronographic Method of Measuring Reverberation Time,” J. Acoustical Soc. Amer. , I (April, 1930 ), No. 1 , p. EXTERNAL
4 Watson F. R. : J. Acoustical Soc Amer. , I , No. 1 , p. 48 . EXTERNAL
5 Crandall : “Theory of Vibrating Systems and Sound,” pp. 138 , 174 . EXTERNAL
6 Watson F. R. : “Acoustics of Buildings.” . EXTERNAL

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Carl F. Eyring; Conditions under Which Residual Sound in Reverberant Rooms May have More than one Rate of Decay, Journal of the Society of Motion Picture Engineers ( Volume: 15, Issue: 4, October 1930); SMPTE, 1930. Available at https://doi.org/10.5594/J14778

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Carl F. Eyring; Conditions under Which Residual Sound in Reverberant Rooms May have More than one Rate of Decay, Journal of the Society of Motion Picture Engineers ( Volume: 15, Issue: 4, October 1930); SMPTE, 1930. Available at https://doi.org/10.5594/J14778

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<span class="citation">Carl F. Eyring; <cite>Conditions under Which Residual Sound in Reverberant Rooms May have More than one Rate of Decay</cite>, Journal of the Society of Motion Picture Engineers ( Volume: 15, Issue: 4, October 1930); SMPTE, 1930. Available at <a href="https://doi.org/10.5594/J14778" target="_blank" rel="noopener">https://doi.org/10.5594/J14778</a></span>

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Carl F. Eyring; <cite id="bib-10-5594-j14778">Conditions under Which Residual Sound in Reverberant Rooms May have More than one Rate of Decay</cite>, Journal of the Society of Motion Picture Engineers ( Volume: 15, Issue: 4, October 1930); SMPTE, 1930
<span class="doi">10.5594/J14778</span>
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Progress in the Motion Picture Industry [Active]