Ear Centering for Accurate Synthesis of Near-Field Head-Related Transfer Functions
Ear Centering for Accurate Synthesis of Near-Field Head-Related Transfer Functions
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DOI：
10.3390/app12168290
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发表时间：
2022-08
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影响因子：
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通讯作者：
Ayrton Urviola;S. Sakamoto;César D. Salvador
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作者：
Ayrton Urviola;S. Sakamoto;César D. Salvador
头部相关传递函数(HRTF)是空间声学技术中的主要工具。点声源的HRTF定义为耳部位置处的声压与参考位置处的自由场声压之比。引用通常被放置在听者头部的中心。当使用球面傅里叶变换(SFT)和距离变滤波(DVF)来合成离头部非常近的点源的HRTF时，模型围绕头部中心的球面对称性不允许区分耳朵位置和头部中心。耳朵居中是一种通过平移参考位置来克服这种不精确度来源的技术。到目前为止，平面波(PW)平移算子在合成远场HRTF时已经产生了有效的人耳中心。我们提出了用于精确合成近场HRTF所需的球面波平移算子。我们对比了PW和SWEAR居中的性能。当采用SWEAR居中时，合成误差持续减小，并且在球面网格所确定的最大频率处观察到增强。
The head-related transfer function (HRTF) is a major tool in spatial sound technology. The HRTF for a point source is defined as the ratio between the sound pressure at the ear position and the free-field sound pressure at a reference position. The reference is typically placed at the center of the listener’s head. When using the spherical Fourier transform (SFT) and distance-varying filters (DVF) to synthesize HRTFs for point sources very close to the head, the spherical symmetry of the model around the head center does not allow for distinguishing between the ear position and the head center. Ear centering is a technique that overcomes this source of inaccuracy by translating the reference position. Hitherto, plane-wave (PW) translation operators have yield effective ear centering when synthesizing far-field HRTFs. We propose spherical-wave (SW) translation operators for ear centering required in the accurate synthesis of near-field HRTFs. We contrasted the performance of PW and SW ear centering. The synthesis errors decreased consistently when applying SW ear centering and the enhancement was observed up to the maximum frequency determined by the spherical grid.