Archives of Acoustics, 43, 4, pp. 657–667, 2018

Formation of Scattering Characteristics for Acoustical Ray Tracing Simulation

University of Belgrade

University of Belgrade

Miomir MIJIĆ
University of Belgrade

Ray tracing simulation of sound field in rooms is a common tool in room acoustic design for predicting impulse response. There are numerous commercial engineering tools utilising ray tracing simulation. A specific problem in the simulation is the modelling of diffuse reflections when contribution of individual surface is prevailing. The paper introduces modelling of scattering which is interesting when the whole impulse response of a room is not a goal but contribution of certain surface. The main goal of the project is to shape directivity characteristics of scattered reflection. Also, an innovative approach is suggested for converting the energy histogram information obtained by ray tracing into an “equivalent impulse response”. The proposed algorithm is tested by comparing the results with measurements in a real sound field, realised in a scaled model where a diffusing surface is hardware-implemented.
Keywords: diffuse reflection; ray tracing; room acoustics; secondary source; scattering pattern
Full Text: PDF
Copyright © Polish Academy of Sciences & Institute of Fundamental Technological Research (IPPT PAN).


Christensen C.L., Rindel J.H. (2005), A new scattering method that combines roughness and diffraction effects, Forum Acousticum, Budapest.

Christensen C.L., Koutsouris G. (2013), Odeon Room Acoustics Software, User Manual, Ver. 12, 2nd Ed., Ch. 6.3.

Collins A.R. (2017), FIR Filter Design, Miscellaneous Technical Articles, from

ISO 3382-1 (2009), Measurement of room acoustic parameters, reference number ISO 3382-1:2009(E).

Krokstad A., Strom S., Sorsdal S. (1968), Calculating the acoustical room response by the use of a ray tracing technique, Journal of Sound and Vibration, 8, 1, 118–125.

Kuttruff H. (2014), Room acoustics, 5th Ed., Spon Press, Milton Park.

Kuttruff H. (1993), Auralization of impulse responses modeled on the basis of ray-tracing results, Journal of the Audio Engineering Society, 41, 11, 876–880.

Rindel J.H. (1995), Computer simulation techniques for acoustical design of rooms, Acoustics Australia, 23, 81–86.

Rindel J.H. (2004), Odeon and the scattering coefficient, Pdf-formatted Power Point Presentation from Odeon Workshop at Baltic-Nordic Acoustical meeting, Mariehamn.

Savioja L., Svensson U.P. (2015), Overview of geometrical room acoustic modeling techniques, Journal of the Acoustical Society of America, 138, 2, 708–730.

Šumarac-Pavlović D., Mijić M. (2010), Partial scale models as a tool in acoustic design, 1st EAA–EuroRegio, Ljubljana.

Šumarac-Pavlović D., Mijić M., Mašović D. (2015), The influence of proscenium boxes on acoustic response in historical opera halls, Journal of Acoustical Society of America,138, 2, 420–425.

Vorländer M. (2013), Computer simulations in room acoustics. Concepts and uncertainties, Journal of the Acoustical Society of America, 133, 3, 1203–1213.

Vorlander M., Mommertz E. (2000), Definition and measurement of random-incidence scattering coefficients, Applied Acoustics, 60, 2, 187–199.

DOI: 10.24425/aoa.2018.125159