De Mey F, Reijniers J, Peremans H, Otani M, Firzlaff U
Department Milieu, Technologie en Technologiemanagement, Universiteit Antwerpen, Prinsstraat 13, 2000 Antwerpen, Belgium.
J Acoust Soc Am. 2008 Oct;124(4):2123-32. doi: 10.1121/1.2968703.
This paper presents a calculation of the head related transfer function (HRTF) for the frontal hemisphere of the phyllostomid bat Phyllostomus discolor using an acoustic field simulation tool based on the boundary element method. From the calculated HRTF results, binaural interaural intensity differences (IIDs) are derived.
Region of highest sensitivity, HRTF patterns, and IID patterns are shown to be in good agreement with earlier experimental measurements on other specimens of the same bat species, i.e., the differences are within the interspecies variability range. Next, it is argued that the proposed simulation method offers distinct advantages over acoustic measurements on real bat specimens. To illustrate this, it is shown how computer manipulation of the virtual morphology model allows a more detailed comprehension of bat spatial hearing by investigating the effects of different head parts on the HRTF. From this analysis it is concluded that for this species the pinna has a significantly larger effect on the HRTF and IID patterns than the head itself. This conclusion argues in favor of a series of recent simulation studies based on pinna morphology only [R. Muller, J. Acoust. Soc. Am. 116, 3701-3712 (2004); Muller et al., ibid 119, 4083-4092 (2006)].
本文使用基于边界元法的声场模拟工具，计算了叶口蝠（Phyllostomus discolor）额叶半球的头部相关传递函数（HRTF）。根据计算得到的HRTF结果，推导出双耳间强度差（IID）。
最高灵敏度区域、HRTF模式和IID模式与对同一蝙蝠物种其他标本的早期实验测量结果高度吻合，即差异在种间变异性范围内。接下来，有人认为所提出的模拟方法相对于对真实蝙蝠标本进行声学测量具有明显优势。为了说明这一点，展示了通过研究不同头部部位对HRTF的影响，如何通过计算机对虚拟形态模型的操作更详细地理解蝙蝠的空间听觉。从该分析得出，对于该物种，耳廓对HRTF和IID模式的影响比对头部本身的影响要大得多。这一结论支持了最近一系列仅基于耳廓形态的模拟研究[R. 米勒，《美国声学学会杂志》116, 3701 - 3712 (2004); 米勒等人，同上119, 4083 - 4092 (2006)]。
