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- W2129124581 abstract "Knowledge of biological sonar systems has revolutionized many aspects of sonar engineering and further advances will benefit from more detailed understanding of their underlying acoustical processes. The anatomically diverse, complex and dynamic heads and ears of bats are known to be important for echolocation although their range-dependent properties are not well understood, particularly across the wide frequency range of some bats' vocalizations. The aim of this and a companion paper Kim et al (2012 Bioinspir. Biomim.) is to investigate bat-head acoustics as a function of bat-target distance, based on measurements up to 100 kHz and more robust examination of hardware characteristics in measurements than previously reported, using a cast of a bat head. In this first paper, we consider the spectral features at either ear (i.e. monaural head-related transfer functions). The results show, for example, that there is both higher magnitude and a stronger effect of distance at close range at relatively low frequencies. This might explain, at least in part, why bats adopt a strategy of changing the frequency range of their vocalizations while approaching a target. There is also potential advantage in the design of bio-inspired receivers of using range-dependent HRTFs and utilizing their distinguished frequency characteristics over the distance." @default.
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- W2129124581 date "2012-10-23" @default.
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- W2129124581 title "Range dependent characteristics in the head-related transfer functions of a bat-head cast: part 1. Monaural characteristics" @default.
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- W2129124581 doi "https://doi.org/10.1088/1748-3182/7/4/046014" @default.
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