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Computational study on acoustic-image perception of object-shape from single-emission echo in bats

蝙蝠单次发射回声物体形状声像感知的计算研究

基本信息

批准号：
17500190
负责人：
YANO Masafumi
金额：
$ 2.24万
依托单位：
Tohoku University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
2005
资助国家：
日本
起止时间：
2005 至 2006
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-17500190/
关键词：
Instrumentation Engineering Biological Engineering Brain, Neuron Information Technology Echolocation

项目摘要

The purpose of this study, entitled "Computational study on acoustic-image perception of object-shape from single-emission echo in bats", is to propose a new computational algorithm for representing an acoustic image of object-shape from an echo evoked by frequency-modulated ultrasonic sound and to examine it in the real world.The acoustic image is an impulse response, known as a reflected-intensity distribution, which is composed of amplitude and phase spectra over a range of frequencies. However, bats detect only the amplitude spectrum due to the low-time resolution of their peripheral auditory system, and the frequency range of emission is restricted. Therefore, for representing the acoustic image, several constraints are needed to restore the reflected-intensity distribution from limited information.The amplitude spectrum varies with the changes in the configuration of the reflected-intensity distribution, while the phase spectrum varies with the changes in its configuration and lo … More cation. As the constraints, the minimum phase condition and the continuity condition for the amplitude spectrum are introduced into the algorithm to restore the acoustic image from the single-emission echo. Simulated results indicated that the configuration can be extrapolated from the amplitude spectrum of the restricted frequency range, and the location can be estimated from the temporal changes of the amplitude spectra, and consequently the algorithm would restore the reflected-intensity distribution of an object regardless of its location or shape.For applying the proposed algorithm to object-recognition in the real world, we designed an artificial external ear of the bat, i.e., a transfer-function modulator that is optimal for obtaining the orientation information, and constructed a system for echolocation and shape-recognition of objects in 3D space. Experimental results indicated that by using the artificial ear having the shape of truncated-horn, the system can determine location and surface-orientation of an object from the echo. Less

本研究的目的是提出一种新的计算算法，用于从调频超声引起的回波中表示物体形状的声学图像，并在真实的世界中对其进行检查。声学图像是脉冲响应，称为反射强度分布，其由频率范围上的幅度谱和相位谱组成。然而，由于蝙蝠外周听觉系统的低时间分辨率，蝙蝠只能检测到幅度谱，并且发射的频率范围受到限制。因此，为了从有限的信息中恢复声强分布，需要对声强分布的振幅谱和相位谱进行约束：振幅谱随声强分布的形状变化而变化，相位谱随声强分布的形状变化而变化。 ...更多信息阳离子该算法引入最小相位条件和幅度谱连续条件作为约束条件，从单次发射回波中恢复声图像。仿真结果表明，该算法可以从有限频率范围内的幅度谱外推物体的形状，并根据幅度谱的时间变化估计物体的位置，从而恢复物体的反射光强分布，而不受物体位置和形状的影响。我们设计了一个蝙蝠的人工外耳，一个传递函数调制器，这是最佳的用于获得的方向信息，并构建了一个系统的回声定位和形状识别的物体在3D空间。实验结果表明，利用截角形人工耳，该系统可以从回波中确定目标的位置和表面方向。少