Advanced SearchSearch Tips
Acoustic Properties of Three-room Coupled System by Connected Two Apertures
facebook(new window)  Pirnt(new window) E-mail(new window) Excel Download
 Title & Authors
Acoustic Properties of Three-room Coupled System by Connected Two Apertures
Na, Hae Joong; Lim, Byoung-Duk;
  PDF(new window)
A coupled room system consists of adjacent rooms and apertures where the sound energy is exchanged between the two rooms. Acoustically, a coupled room system shows a non-exponential decay profile. Most of the related researches have been to analyze the acoustic properties of two-room coupled system so far whereas three-room coupled system were seldom studied. In this regard, this paper aims to analyse the distribution of sound pressure level, sound decay curve of three-room coupled system and sound energy flow between them by using the acoustic diffusion model and to further verify them through experiments. Firstly, the sound pressure level distribution and mean sound pressure level in the steady-state condition are analyzed at various frequencies and source locations. Good agreements are observed in both experiments and analysis results. Secondly, two double slope effect quantifiers of sound attenuation, LDT/EDT and LDT/T10 are compared at various frequencies and for different source locations. The result indicates that LDT/T10, less affected by the early reflection patterns than LDT/EDT, is more suitable to the analysis and experiments of a multi-slope sound decay curve. Lastly, the sound energy flow in each room is analyzed based on the acoustic diffusion model. After the early decay stage, the sound energy is observed to flow from the room with a long reverberation time to the room with a short one.
Coupled Room;Aperture;Statistical Acoustics Model;Acoustic Diffusion Model;
 Cited by
Kuttruff, K., 2000, Room Acoustics, 4th Ed., Elsevier Science Ltd., London and New York.

Davis, A. H., 1925, Reverberation Equations for Two Adjacent Rooms Connected by an Incompletely Sound-proof Partition, Philos. Mag., Vol. 50, No. 297, pp. 75~80. crossref(new window)

Summers, J. E., 2005, Technical Note: Remark on The Formal Identity of Two Statistical-acoustics Models of Coupled Rooms, Build. Acoust., Vol. 12, No. 1, pp. 41~50. crossref(new window)

Cremer, L. and Müller, H. A., 1982, Principles and Applications of Room Acoustics, Trans. T. J. Schultz Applied Science, New York.

Valeau, V., Picaut, J. and Hodgson, M., 2006, On the Use of a Diffusion Equation for Room-acoustic Prediction, J. Acoust. Soc. Am., Vol. 119, No. 3, pp. 1504~1513. crossref(new window)

Luizard, P., Xiang, N., Polack, J. D. and Katz, B. F. G., 2012, Coupled Volumes and Statistical Acoustics : Preliminary Results of an Improved Analytical Model, J. Acoust. Soc. Am., Vol. 131, No. 4, pp. 129~134. crossref(new window)

Xiang, N., Goggans, P., Jasa, T. and Robinson, P., 2010, Bayesian Characterization of Multiple-slope Sound Energy Decays in Coupled-volume Systems, J. Acoust. Soc. Am., Vol. 129, No. 2, pp. 741~752.

Summers, J. E., Torres, R. R. and Shimizu, Y., 2004, Statistical-acoustics Models of Energy Decay in System of Coupled Rooms and Their Relation to Geometrical Acoustics, J. Acoust. Soc. Am., Vol. 116, No. 2, pp. 958~969. crossref(new window)

Summers, J. E., 2012, Accounting for Delay of Energy Transfer between Coupled Rooms in Statistical-acoustics Models of Reverberant Decay, J. Acoust. Soc. Am., Vol. 132, No. 2, pp. 129~132.

Billon, A., Foy, C., Valeau, V., Picaut, J. and Sakout, A., 2008, Modeling the Sound Transmission Between Rooms Coupled through Partition Walls by Using a Diffusion Model, J. Acoust. Soc. Am., Vol. 123, No. 6, pp. 4261~4271. crossref(new window)

Billon, A., Picaut, J. and Sakout, A., 2008, Prediction of the Reverberation Time in High Absorbent Room Using a Modified-diffusion Model, Appl. Acoust., Vol. 69, No. 1, pp. 68~74. crossref(new window)

Jing, Y. and Xiang, N., 2008, On Boundary Conditions for the Diffusion Equation in Room-acoustic Prediction : Theory, Simulations, and Experiments, J. Acoust. Soc. Am., Vol. 123, No. 1, pp. 145~153. crossref(new window)

Fortin, N., Picaut, J., Billon, A., Valeau, V. and Sakout, A., 2009, Sound Field Modeling in Architectural Acoustics Using a Diffusion Equation Based Model, Proceedings of the COMSOL Conference,

KS F 2864: 2012, Measurement of the Reverberation Time of Rooms with Reference to the Other Acoustical Parameters.

Bradley, D. T. and Wang, L. M., 2009, Quantifying the Double Slope Effect in Coupled Volume Room Systems, J. Building. Acoust., Vol. 16, No. 2, pp. 105~123. crossref(new window)

Bradley, D. T. and Wang, L. M., 2010, Optimum Absorption and Aperture Parameters for Realistic Coupled Volume Spaces Determined from Computational Analysis and Subjective Testing Results, J. Acoust. Soc. Am., Vol. 27, No. 1, pp. 223~232.

Jing, Y. and Xiang, N., 2008, Visualizations of Sound Energy Across Coupled Rooms Using a Diffusion Equation Model, J. Acoust. Soc. Am., Vol. 124, No. 6, pp. 360~365. crossref(new window)

Xiang, N., Jing, Y. and Bockman, A. C., 2009, Investigation of Acoustically Coupled Enclosure Using a Diffusion-equation Model, J. Acoust. Soc. Am., Vol. 126, No. 3, pp. 1187~1198. crossref(new window)