There are various approaches to understanding the echolocation phenomenon of bats. A part of the echolocating process is assessed here by determining what acoustic signal a bat's ears receive during echolocation. It is simplified in an experimental rig to measure the reflections from objects in different horizontal angles which represents a sound localisation task in bats. It has been assumed in this study that the remarkable echolocating ability of bats, which is not shown in the most other mammalian species, is achieved by their different physical shape of head and ears, and specialised auditory processing of echolocating signals. In human studies in terms of sound localisation, physical characteristics are usually modelled as a head?related transfer function (or HRTF) and gammatone filter banks are widely used to simulate auditory processing in the cochlear. A modified filterbank is used here to represent the auditory processing in bats and combined with the experimental data of object reflections. Bat HRTFs will be used subsequently to determine the acoustic reflections at both ears.
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机译:有多种方法可以理解蝙蝠的回声定位现象。通过确定蝙蝠的耳朵在回声定位过程中接收到的声音信号,可以评估回声定位过程的一部分。它在实验装置中进行了简化,以测量来自不同水平角度的物体的反射,这代表了蝙蝠的声音定位任务。在这项研究中已经假定,蝙蝠具有显着的回声定位能力,这在大多数其他哺乳动物中都没有表现出来,这是由于它们的头部和耳朵的物理形状不同以及对回声定位信号进行专门的听觉处理而实现的。在人类的声音定位研究中,通常将物理特征建模为与头部相关的传递函数(或HRTF),并且伽马通滤镜组被广泛用于模拟耳蜗中的听觉处理。此处使用改良的滤波器组来表示蝙蝠的听觉处理,并与物体反射的实验数据结合在一起。 Bat HRTF将随后用于确定两只耳朵的声反射。
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