Paper Abstract and Keywords |
Presentation |
2009-06-26 17:00
The design of a directional sound source for numerical simulation based on wave acoustics Toshimasa Suziki (Sophia Univ.), Hirofumi Nakajima, Kazuhiro Nakadai (Honda Research Institute Japan Co., Ltd.), Takayuki Arai (Sophia Univ.), Yuji Hasegawa (Honda Research Institute Japan Co., Ltd.) EA2009-36 |
Abstract |
(in Japanese) |
(See Japanese page) |
(in English) |
Thanks to improvements in computer performance, numerical simulation
based on wave acoustics works in practical time with off-the-shelf
computers. Such a numerical simulation method accurately estimates a
sound field when it is a simple and simulated environment like a free
sound field. However, this method has difficulties in simulating a
real-world acoustic environment. One of issues for real-world
simulation is to deal with a sound directivity. Thus, most numerical
simulators assume a point sound source to avoid this issue. Indeed,
several studies to cope with a sound directivity have been reported,
but, the accuracy and practical are insufficient for real-world
simulation, because an accurate sound propagation model is necessary
to deal with a sound directivity. We use a compact finite difference
method based on sound field digitization which has an accurate sound
propagation model. However, this method also has a problem, that is,
two points are simulated differently even when they are located with
the same distance from the sound source due to the difference in the
effect of their numerical variances. In this paper we, first, confirm
the performance of our method by using an omni-directional point
source in a free sound field. After that, we show that our method is
able to simulate a directional sound source accurately using a
combination of a simple loudspeaker and a point source models. |
Keyword |
(in Japanese) |
(See Japanese page) |
(in English) |
numerical simulation / wave acoustics / compact finite difference / directivity / / / / |
Reference Info. |
IEICE Tech. Rep., vol. 109, no. 100, EA2009-36, pp. 109-114, June 2009. |
Paper # |
EA2009-36 |
Date of Issue |
2009-06-18 (EA) |
ISSN |
Print edition: ISSN 0913-5685 Online edition: ISSN 2432-6380 |
Copyright and reproduction |
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EA2009-36 |
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