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Range dependent characteristics in the head-related transfer functions of a bat-head cast: part 1. Monaural characteristics

Range dependent characteristics in the head-related transfer functions of a bat-head cast: part 1. Monaural characteristics
Range dependent characteristics in the head-related transfer functions of a bat-head cast: part 1. Monaural characteristics
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
sound production by animals, mechanisms, characteristics, populations, biosonar
1748-3182
046014-[14pp]
Kim, S.
583524b9-1ca8-4de5-b235-82c689e2a08a
Allen, R.
956a918f-278c-48ef-8e19-65aa463f199a
Rowan, D.
5a86eebe-53da-4cd2-953e-e3ca1ae61578
Kim, S.
583524b9-1ca8-4de5-b235-82c689e2a08a
Allen, R.
956a918f-278c-48ef-8e19-65aa463f199a
Rowan, D.
5a86eebe-53da-4cd2-953e-e3ca1ae61578

Kim, S., Allen, R. and Rowan, D. (2012) Range dependent characteristics in the head-related transfer functions of a bat-head cast: part 1. Monaural characteristics. Bioinspiration & Biomimetics, 7 (4), 046014-[14pp]. (doi:10.1088/1748-3182/7/4/046014). (PMID:23093100)

Record type: Article

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

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e-pub ahead of print date: October 2012
Published date: December 2012
Keywords: sound production by animals, mechanisms, characteristics, populations, biosonar
Organisations: Human Sciences Group, Signal Processing & Control Grp

Identifiers

Local EPrints ID: 346246
URI: http://eprints.soton.ac.uk/id/eprint/346246
ISSN: 1748-3182
PURE UUID: 27f9de7f-079e-4523-9f42-37fc44690fab
ORCID for D. Rowan: ORCID iD orcid.org/0000-0002-7190-9997

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Date deposited: 14 Dec 2012 10:26
Last modified: 08 Jan 2022 02:57

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Contributors

Author: S. Kim
Author: R. Allen
Author: D. Rowan ORCID iD

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