The intent of this study is to examine the variations between current implementations of standard room acoustic measures for impulse response measurements. An international round robin has been conducted using a single real measured impulse response, rather than a synthesized response. This offers a more rigorous test of analysis procedures. While there is good agreement at higher frequencies, large variations are found at lower frequencies in which the noise level within the measurement is greater. Some errors are attributed to the existence or robustness of noise-floor detection.
REFERENCES
1.
ISO 3382:1997 Acoustics—Measurement of the reverberation time of rooms with reference to other acoustical parameters.
2.
I. Bork, “Simulation and measurement of auditorium acoustics—The round robins on room acoustical simulation,” Proceedings of the Institute of Acoustics v.24, Part 4, 2002.
3.
NPL workshop on “Acoustic Measurements in Auditoria and Listening Rooms,” July 2002, http://www.npl.co.uk/acoustics/publications/acnews/11/, results not published to date.
4.
A.
Lundeby
, T. E.
Vigran
, H.
Bietz
, and M.
Vörlander
, “Uncertainties of measurements in room acoustics
,” Acustica
81
, 344
–355
(1995
).5.
J. S. Bradley, “An international comparison of room acoustic measurement systems.” Institute for Research in Construction, IRC Internal Report IRC-IR-714, Jan. 1996.
6.
M. Ikegame and K. Uchida, “Comparison of various types of acoustic indexes calculated from the same impulse response,” (in Japanese), Proceedings of the Symposium on Impulse Response Measurements and Evaluation of Acoustic Indexes, Architectural Institute of Japan, April 2001, pp. 7–13.
7.
H. P.
Seraphim
, “Untersuchungen über die Unterschiedsschwelle exponentiellen Abklingens von Rauschbandimpulsen” (Investigations on the difference limen of exponentially decaying bandlimited noise pulses) (in German)
Acustica
8
, 280
–284
(1958
).8.
T. J.
Cox
, W. J.
Davies
, and Y. W.
Lam
, “The sensitivity of listeners to early sound field changes in auditoria
,” Acustica
79
, 27
–41
(1993
).9.
M. Vörlander, “International round robin on room acoustical computer simulations,” Proceedings 15th ICA Trondheim, June 1995, pp. 689–692.
10.
L. Cremer, and H. A. Müller, Principles and Applications of Room Acoustics, translated by T. Schultz (Applied Science Publishers, London/New York, 1982), Vol. 1.
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© 2004 Acoustical Society of America.
2004
Acoustical Society of America