Characteristics of Near-Field Head-Related Transfer Function for KEMAR
A spherical dodecahedron sound source was designed to approximate a point source. The resulted sound source is approximately non-directivity below 10kHz; the multiple scattering caused by sound source are neglectable, and low-frequency characteristics of sound source is improved. By using the sound source, the near-field head-related transfer function (HRTF) database of a Knowles Electronic Manikin for Acoustic Research (KEMAR) has been established. Based on the database, characteristics of the near-field HRTFs were analyzed and compared with those of the far-field HRTFs in frequency domain and time domain respectively. Finally, the variations of binaural localization cues including interaural level difference (ILD) and interaural time difference (ITD) with source distance were analyzed, so as to evaluate the distance localization cues contained in the near-field HRTFs.
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