Generally, dummy-head microphone is used for the 3D audio acquisition. Because of its human-like shape, we can get good spatial images. However its shape and size are also the restriction of its public use. In this paper, we propose 3D audio acquisition and reproduction method using multiple microphones on a rigid sphere. We place the 5 microphones on a rigid sphere's special points and generate various audio signals for the reproduction of headphone, stereo, stereo dipole, 4ch and 5ch reproduction environments. Subjective reproduction experiments of 4ch and 5ch loudspeaker configurations show that the front/back confusion, which is common limitation of 3D audio reproduction system using dummy-head microphone, can be reduced dramatically.
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