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Frequency-dependent variation in the two-dimensional beam pattern of an echolocating dolphin.

Starkhammar, Josefin LU ; Moore, Patrick W; Talmadge, Lois and Houser, Dorian S (2011) In Biology Letters 7. p.836-839
Abstract
Recent recordings of dolphin echolocation using a dense array of hydrophones suggest that the echolocation beam is dynamic and can at times consist of a single dominant peak, while at other times it consists of forward projected primary and secondary peaks with similar energy, partially overlapping in space and frequency bandwidth. The spatial separation of the peaks provides an area in front of the dolphin, where the spectral magnitude slopes drop off quickly for certain frequency bands. This region is potentially used to optimize prey localization by directing the maximum pressure slope of the echolocation beam at the target, rather than the maximum pressure peak. The dolphin was able to steer the beam horizontally to a greater extent... (More)
Recent recordings of dolphin echolocation using a dense array of hydrophones suggest that the echolocation beam is dynamic and can at times consist of a single dominant peak, while at other times it consists of forward projected primary and secondary peaks with similar energy, partially overlapping in space and frequency bandwidth. The spatial separation of the peaks provides an area in front of the dolphin, where the spectral magnitude slopes drop off quickly for certain frequency bands. This region is potentially used to optimize prey localization by directing the maximum pressure slope of the echolocation beam at the target, rather than the maximum pressure peak. The dolphin was able to steer the beam horizontally to a greater extent than previously described. The complex and dynamic sound field generated by the echolocating dolphin may be due to the use of two sets of phonic lips as sound sources, or an unknown complexity in the sound propagation paths or acoustic properties of the forehead tissues of the dolphin. (Less)
Please use this url to cite or link to this publication:
author
organization
publishing date
type
Contribution to journal
publication status
published
subject
in
Biology Letters
volume
7
pages
836 - 839
publisher
Royal Society
external identifiers
  • wos:000296890900011
  • pmid:21561965
  • scopus:80052412896
ISSN
1744-9561
DOI
10.1098/rsbl.2011.0396
language
English
LU publication?
yes
id
fddba0ba-7463-479b-ba70-64fca570b167 (old id 1972900)
date added to LUP
2011-06-14 09:43:48
date last changed
2017-08-27 03:27:39
@article{fddba0ba-7463-479b-ba70-64fca570b167,
  abstract     = {Recent recordings of dolphin echolocation using a dense array of hydrophones suggest that the echolocation beam is dynamic and can at times consist of a single dominant peak, while at other times it consists of forward projected primary and secondary peaks with similar energy, partially overlapping in space and frequency bandwidth. The spatial separation of the peaks provides an area in front of the dolphin, where the spectral magnitude slopes drop off quickly for certain frequency bands. This region is potentially used to optimize prey localization by directing the maximum pressure slope of the echolocation beam at the target, rather than the maximum pressure peak. The dolphin was able to steer the beam horizontally to a greater extent than previously described. The complex and dynamic sound field generated by the echolocating dolphin may be due to the use of two sets of phonic lips as sound sources, or an unknown complexity in the sound propagation paths or acoustic properties of the forehead tissues of the dolphin.},
  author       = {Starkhammar, Josefin and Moore, Patrick W and Talmadge, Lois and Houser, Dorian S},
  issn         = {1744-9561},
  language     = {eng},
  pages        = {836--839},
  publisher    = {Royal Society},
  series       = {Biology Letters},
  title        = {Frequency-dependent variation in the two-dimensional beam pattern of an echolocating dolphin.},
  url          = {http://dx.doi.org/10.1098/rsbl.2011.0396},
  volume       = {7},
  year         = {2011},
}