A note on the proper frequency resolution for the room transfer function in the phased beam tracing method

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In the simulation of acoustic response of a room, one cannot satisfactorily estimate the transfer function or the impulse response with a sparse frequency resolution. We have studied about the frequency resolution for a satisfactory estimation of room transfer function or the reverberation time using the phased beam tracing method. In order to investigate what happens with the frequency resolution, a number of frequency resolution (0.01-1 Hz), which are usually employed in the numerical analysis, was tested for a room model. It was found that the total accumulated phase in a transfer function and the late part of an impulse response of a room are influenced by the frequency resolution. Main reason for the difference is the correct detection of non-minimum phase zeros, depending on the frequency resolution. A criterion for a proper frequency resolution was suggested by considering the modal density of three-dimensional space. When a sparse dataset was initially given, we showed that cubic spline interpolation can be used to enhance the precision of detection for non-minimum phase zeros. (C) 2007 Elsevier Ltd. All rights reserved.
Publisher
ELSEVIER SCI LTD
Issue Date
2009-01
Language
English
Article Type
Article
Citation

APPLIED ACOUSTICS, v.70, no.1, pp.120 - 128

ISSN
0003-682X
DOI
10.1016/j.apacoust.2007.12.009
URI
http://hdl.handle.net/10203/100394
Appears in Collection
ME-Journal Papers(저널논문)
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