Interaural time difference (ITD) is related with spatial position (distance and direction) of the sound source and head size. Assuming the sound source and the coordinate system are fixed, the position relationship between the sound source and head center will be influenced by the head offset relative to the coordinate origin, which may lead to the spatial distribution distortion of ITD in measuring head-related transfer functions (HRTFs). In this paper the variation of ITD caused by head offset is analyzed using the conventional Woodworth ITD model consisting of a spherical head and a point sound source. Results show that the forward (or backward) offsets of head result in small variation of ITDs, however, the spatial distribution distortion of ITDs introduced by the rightward (or leftward) offset of head is unacceptable.
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