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In this paper, we propose a novel system to localize a sound source in any planar direction using only two microphones. In our system, the two microphones are asymmetrically placed on a sphere, thus, 1) the diffraction by the sphere and the asymmetrical arrangement of the microphones give the localization cue including the frontback judgment, and 2) unlike the dummy head system, no previous measurements are necessary due to the analytical representation of the sphere diffraction. To deal withdoi:10.4304/jmm.3.3.1-9 fatcat:dqyuogvicncodbqbzrzyxrnihi