Calculation and Analysis of Near-Field Head-Related Transfer Functions from a Simplified Head-Neck-Torso Model

To evaluate the overall effect of the neck and torso on the head-related transfer function(HRTF),a simplified head-neck-torso(HNT)model,which consists of a spherical head,spherical torso and cylindrical neck,is proposed and the corresponding HRTFs are calculated using the boundary element method(BEM).The results indicate that the HRTF magnitudes for the HNT model are different from those of the existing spherical head-and-torso model(HAT)above 0.5 kHz,especially in the near-field and contralateral region.The discrepancy in the HRTF magnitudes leads to a discrepancy in the interaural level differences(ILDs)for the HNT and HAT models,which reaches a level of-l0dB at source distance of 0.2m.As the source distance increases,the discrepancy in the results of the HNT and HAT models reduces.Measurement on practical HNT and HAT models validates the analysis.Therefore,the neck influences near-field HRTFs and should be included in the near-field HRTF calculation.

基于三维头型及穴位分布的辅助设计平台的研究

为设计适合中国人头型的头戴产品,提高产品佩戴时的适配性和舒适性,开展了辅助头戴产品设计的图形化平台的研究。首先基于国家标准重构了5种标准头型的三维头部数字化模型,并根据不同头型的第5,50和95百分位的头型缩放因子,构造了共15个三维数字化头型;然后根据中医理论中的穴位分布及定位方法,在所构造的头型上建立了7条经络和78个穴位的三维分布模型。采用三维网络图形开发包Three.js开发了头戴产品辅助设计平台,实现了多百分位头型的连续变形、头部穴位动态定位及基准平面剖切功能,可对头戴产品的穴位点匹配、贴合区域间隙和干涉等进行适配性分析。以某头戴按摩仪为例开展试戴及适配性分析,可有效发现该产品结构上存在的问题。该研究可为相关头戴产品的适配性分析提供参考。