A Spatial Audio System Using Multiple Microphones on a Rigid Sphere

The main purpose of a spatial audio system is to give a listener the same impression as if he/she were present in a recorded environment. A dummy head microphone is generally used for such purposes. Because of its human‐like shape, we can obtain good spatial sound images. However, its shape is a res...

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Bibliographic Details
Published in:ETRI journal 2005-04, Vol.27 (2), p.153-165
Main Authors: Lee, Taejin, Jang, Daeyoung, Kang, Kyeongok, Kim, Jinwoong, Jeong, Dae‐Gwon, Hamada, Hareo
Format: Article
Language:English
Subjects:
3D audio
dummy head microphone
HRTF
sphere microphone
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Summary:The main purpose of a spatial audio system is to give a listener the same impression as if he/she were present in a recorded environment. A dummy head microphone is generally used for such purposes. Because of its human‐like shape, we can obtain good spatial sound images. However, its shape is a restriction on its public use and it is difficult to convert a 2‐channel recording into multi‐channel signals for an efficient rendering over a multi‐speaker arrangement. In order to solve the problems mentioned above, a spatial audio system is proposed that uses multiple microphones on a rigid sphere. The system has five microphones placed on special points of the rigid sphere, and it generates audio signals for headphone, stereo, stereo dipole, 4‐channel, and 5‐channel reproduction environments. Subjective localization experiments show that front/back confusion, which is a common limitation of spatial audio systems using the dummy head microphone, can be reduced dramatically in 4‐channel and 5‐channel reproduction environments and can be reduced slightly in a headphone reproduction
ISSN:1225-6463
2233-7326
DOI:10.4218/etrij.05.0104.0071