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Range dependent characteristics in the head-related transfer functions of a bat-head cast: part 2. Binaural characteristics

Range dependent characteristics in the head-related transfer functions of a bat-head cast: part 2. Binaural characteristics
Range dependent characteristics in the head-related transfer functions of a bat-head cast: part 2. Binaural characteristics
Further innovations in bio-inspired engineering based on biosonar systems, such as bats, may arise from more detailed understanding of the underlying acoustic processes. This includes the range-dependent properties of bat heads and ears, particularly at the higher frequencies of bat vocalizations. In a companion paper Kim et al (2012 Bioinspir. Biomim.), range-dependent head-related transfer functions of a bat head cast were investigated up to 100 kHz at either ear (i.e. monaural features). The current paper extends this to consider range-dependent spectral and temporal disparities between the two ears (i.e. binaural features), using experimental data and a spherical model of a bat head to provide insights into the physical basis for these features. It was found that binaural temporal and high-frequency binaural spectral features are approximately independent of distance, having the effect of decreasing their angular resolution at close range. In contrast, low-frequency binaural spectral features are strongly distance-dependent, such that angular sensitivity can be maintained by lowering the frequency of the echolocation emission at close range. Together with the companion paper Kim et al, we speculate that distance-dependent low-frequency monaural and binaural features at short range might help explain why some species of bats that drop the frequency of their calls on target approach while approaching a target. This also provides an impetus for the design of effective emissions in sonar engineering applied to similar tasks.


medical physics, biological physics
1748-3182
046015-[16pp]
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 2. Binaural characteristics. Bioinspiration & Biomimetics, 7 (4), 046015-[16pp]. (doi:10.1088/1748-3182/7/4/046015). (PMID:23093141)

Record type: Article

Abstract

Further innovations in bio-inspired engineering based on biosonar systems, such as bats, may arise from more detailed understanding of the underlying acoustic processes. This includes the range-dependent properties of bat heads and ears, particularly at the higher frequencies of bat vocalizations. In a companion paper Kim et al (2012 Bioinspir. Biomim.), range-dependent head-related transfer functions of a bat head cast were investigated up to 100 kHz at either ear (i.e. monaural features). The current paper extends this to consider range-dependent spectral and temporal disparities between the two ears (i.e. binaural features), using experimental data and a spherical model of a bat head to provide insights into the physical basis for these features. It was found that binaural temporal and high-frequency binaural spectral features are approximately independent of distance, having the effect of decreasing their angular resolution at close range. In contrast, low-frequency binaural spectral features are strongly distance-dependent, such that angular sensitivity can be maintained by lowering the frequency of the echolocation emission at close range. Together with the companion paper Kim et al, we speculate that distance-dependent low-frequency monaural and binaural features at short range might help explain why some species of bats that drop the frequency of their calls on target approach while approaching a target. This also provides an impetus for the design of effective emissions in sonar engineering applied to similar tasks.


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More information

Published date: 23 October 2012
Keywords: medical physics, biological physics
Organisations: Human Sciences Group

Identifiers

Local EPrints ID: 344767
URI: http://eprints.soton.ac.uk/id/eprint/344767
ISSN: 1748-3182
PURE UUID: 33e9b953-313e-4e41-b196-bb4925592e50
ORCID for D. Rowan: ORCID iD orcid.org/0000-0002-7190-9997

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Date deposited: 30 Oct 2012 16:57
Last modified: 09 Jan 2022 03:11

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Contributors

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

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