Sphere scattering model with a hemispherically divided surface covering used to approximate the contribution of hair to the auditory percept. The black dot illustrates the pinna location.
Spatial reference planes and relative source rotation angles (starting from 0°). For the symmetric hair and pinna alignment used, the frontal plane is identical to the azimuth plane with the appropriate angular remapping.
Changes in the right ear head-related transfer function (HRTF) due to the addition of a hemispherical hair covering with a specific acoustic impedance of , . The left panels display the azimuthal HRTF and the right panels the median HRTF. The upper panels correspond to a rigid sphere, the central panels include a hemispherical hair covering, and the lower panels show the decomposed HRTF change due to the hair covering.
Azimuthal circumferential surface pressure magnitudes at for eight angles of source incidence for a spherical head with a hemispherical hair covering (where , ). The black dot on the polar plots corresponds to the pressure at the right ear and the dashed lines illustrate the polar axes and the unit circle for reference.
Changes in the interaural level difference (ILD) due to the addition of a hemispherical hair covering (where , ), (a) ILD for a rigid sphere, (b) ILD including the hemispherical hair covering, and (c) decomposed ILD change due to the hair covering.
Low and high frequency interaural time differences (ITD) derived from a spherical head model either completely rigid or with a hemispherical hair covering .
Decomposed changes in the right ear HRTF due to the addition of a hemispherical covering of hair. The utilized impedance values correspond to human hair samples measured with varying sample thickness and bulk density, (a) , , (b) , , and (c) , .
Decomposed changes in the high frequency ITD due to the addition of a hemispherical hair covering to a spherical head model. The utilized impedance values correspond to human hair samples measured with varying sample thickness and bulk density, (a) , , (b) , , and (c) , .
Experimental setup showing the wooden sphere with the synthetic hair covering. The hairline is elevated 45° and the microphone (ear) is set within the azimuth plane, offset from the frontal median axis by 90°.
Comparison of experimental (left panels) and analytical (right panels) results for the decomposed contribution of the synthetic hair material to the right ear HRTF and ILD.
Comparison of experimental and analytical values of the high frequency interaural time difference (ITD) for (a) a rigid sphere and (b) a rigid sphere with a hemispherical covering of synthetic hair.
The decomposed contribution of the synthetic hair material to the right ear HRTF and ILD relative to a rigid spherical head model with offset pinnae.
Experimental changes to the right ear HRTF and ILD due to the addition of a hemispherical hair covering and a cylindrical neck to a rigid spherical head.
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