An Efficient Auralization of Edge Diffraction

This paper contributes to the modeling and auralization of diffractionwhich is one of the most important acoustic phenomenon caused bythe wave nature of sound. However, most room acoustic modelingalgorithms rely on geometrical acoustic techniques which completelyneglect the diffraction. The reason for this is that such methods asray-tracing [1], beam-tracing [2] and image-source method [3, 4] as-sume that sound propagates as light, i.e., the wavelength of the soundis much shorter than the dimensions of the reflecting objects. In thispaper we show how diffracted sound components can be added to theimage-source method and how an efficient auralization of diffractedcomponents can be realized.

[1]  Mendel Kleiner,et al.  EDGE DIFFRACTION IN ROOM ACOUSTICS COMPUTATIONS , 2001 .

[2]  J. Borish.  Extension of the image model to arbitrary polyhedra , 1984 .

[3]  M. Kleiner,et al.  Computation of edge diffraction for more accurate room acoustics auralization. , 2001, The Journal of the Acoustical Society of America.

[4]  Tapio Lokki,et al.  Creating Interactive Virtual Acoustic Environments , 1999 .

[5]  Djamel Ouis.  Diffraction by a hard half‐plane: Useful and simple frequency forms to an exact time‐domain solution , 1998 .

[7]  Y. Sakurai,et al.  Sound reflections of a rigid plane panel and of the “live end” composed by those panels , 1981 .

[8]  Unto K. Laine,et al.  Frequency-warped signal processing for audio applications , 2000 .

[9]  U. Svensson,et al.  An analytic secondary source model of edge diffraction impulse responses , 1999 .

[10]  M. Kleiner,et al.  Audibility of edge diffraction in auralization of a stage house , 1998 .

[11]  M. Biot,et al.  Formulation of Wave Propagation in Infinite Media by Normal Coordinates with an Application to Diffraction , 1957 .

[12]  Jont B. Allen,et al.  Image method for efficiently simulating small‐room acoustics , 1976 .

[13]  Julius O. Smith,et al.  Bark and ERB bilinear transforms , 1999, IEEE Trans. Speech Audio Process..

[14]  A. Krokstad,et al.  Calculating the acoustical room response by the use of a ray tracing technique , 1968 .

[15]  William L. Martens,et al.  A filtering model for efficient rendering of the spatial image of an occluded virtual sound source , 1999 .

[16]  Nicolas Tsingos,et al.  Soundtracks for Computer Animation: Sound Rendering in Dynamic Environment with Occlusions , 1997, Graphics Interface.

[17]  Unto K. Laine,et al.  Realizable warped IIR filters and their properties , 1997, 1997 IEEE International Conference on Acoustics, Speech, and Signal Processing.

[18]  Tapio Lokki,et al.  Implementation and Visualization of Edge Diffraction with Image-source Method , 2002 .

[19]  Nicolas Tsingos,et al.  Fast Rendering of Sound Occlusion and Diffraction Effects for Virtual Acoustic Environments , 1998 .

[20]  Thomas A. Funkhouser,et al.  Modeling acoustics in virtual environments using the uniform theory of diffraction , 2001, SIGGRAPH.

[21]  A. Harma,et al.  Warped filters and their audio applications , 1997, Proceedings of 1997 Workshop on Applications of Signal Processing to Audio and Acoustics.