Journal article
A note on the proper frequency resolution for the room transfer function in the phased beam tracing method
Center for Noise and Vibration Control, Department of Mechanical Engineering, KAIST, Daejeon 305-701, Republic of Korea
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 (0.01–1Hz), 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.
Language: | English |
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Year: | 2009 |
Pages: | 120-128 |
ISSN: | 1872910x and 0003682x |
Types: | Journal article |
DOI: | 10.1016/j.apacoust.2007.12.009 |