HHead-Related Transfer Function (HRTF) is defined by the ratio of sound pressure at the center of the head without listener and the one at his/her ear. Frequency characteristics of a sound source ought to be cancelled in its acquisition based on this definition, but they are not when the sound sources are spatially distributed such as conventional multiple-driver loudspeaker systems. In this e-brief such influence was investigated by using the HRTFs acquired with various types of loudspeaker systems. As a result, it was found that the HRTFs acquired with four types of loudspeakers roughly agreed when the distance from the sound source is 1.5 m and farther.
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