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Separating overlapping click trains originating from multiple individuals in echolocation recordings.

Starkhammar, Josefin LU ; Nilsson, Johan LU ; Amundin, Mats; Kuczaj, Stan A; Almqvist, Monica LU and Persson, Hans W LU (2011) In Journal of the Acoustical Society of America 129(1). p.458-466
Abstract
Recordings of the acoustic activity of free-swimming groups of echolocating dolphins increase the likelihood of collecting overlapping click trains, originating from multiple individuals, in the same set of data. In order to evaluate the click properties of each individual based on such recordings it is necessary to identify which clicks originate from which animal. This paper suggests a computationally efficient strategy to separate overlapping click trains originating from multiple free-swimming bottlenose dolphins, enabling echolocation analysis at an individual level on several animals. This technique is based on sequential matching of the frequency spectra of successive clicks. The clicks are grouped together as individual click... (More)
Recordings of the acoustic activity of free-swimming groups of echolocating dolphins increase the likelihood of collecting overlapping click trains, originating from multiple individuals, in the same set of data. In order to evaluate the click properties of each individual based on such recordings it is necessary to identify which clicks originate from which animal. This paper suggests a computationally efficient strategy to separate overlapping click trains originating from multiple free-swimming bottlenose dolphins, enabling echolocation analysis at an individual level on several animals. This technique is based on sequential matching of the frequency spectra of successive clicks. The clicks are grouped together as individual click trains if the correlation coefficients between clicks are higher than a pre-set threshold level. The robustness of the algorithm is tested by adding artificially generated white Gaussian noise and comparing the results with other comparable commonly used methods based on inter-click intervals, centroid frequencies, and amplitude levels. The described method is applicable to a variety of experimental and observational contexts, e.g., those regarding echolocation development of calves, the hypothesized acoustic "etiquette" among dolphins when investigating the same object, and the possible occurrence of eavesdropping in large dolphin pods. (Less)
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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
in
Journal of the Acoustical Society of America
volume
129
issue
1
pages
458 - 466
publisher
American Institute of Physics
external identifiers
  • wos:000286944600051
  • pmid:21303025
  • scopus:79551655976
ISSN
1520-8524
DOI
10.1121/1.3519404
language
English
LU publication?
yes
id
cc510c13-92dd-48d4-b1d3-cf85b8f411e2 (old id 1832149)
date added to LUP
2011-03-04 11:27:38
date last changed
2017-01-01 06:00:45
@article{cc510c13-92dd-48d4-b1d3-cf85b8f411e2,
  abstract     = {Recordings of the acoustic activity of free-swimming groups of echolocating dolphins increase the likelihood of collecting overlapping click trains, originating from multiple individuals, in the same set of data. In order to evaluate the click properties of each individual based on such recordings it is necessary to identify which clicks originate from which animal. This paper suggests a computationally efficient strategy to separate overlapping click trains originating from multiple free-swimming bottlenose dolphins, enabling echolocation analysis at an individual level on several animals. This technique is based on sequential matching of the frequency spectra of successive clicks. The clicks are grouped together as individual click trains if the correlation coefficients between clicks are higher than a pre-set threshold level. The robustness of the algorithm is tested by adding artificially generated white Gaussian noise and comparing the results with other comparable commonly used methods based on inter-click intervals, centroid frequencies, and amplitude levels. The described method is applicable to a variety of experimental and observational contexts, e.g., those regarding echolocation development of calves, the hypothesized acoustic "etiquette" among dolphins when investigating the same object, and the possible occurrence of eavesdropping in large dolphin pods.},
  author       = {Starkhammar, Josefin and Nilsson, Johan and Amundin, Mats and Kuczaj, Stan A and Almqvist, Monica and Persson, Hans W},
  issn         = {1520-8524},
  language     = {eng},
  number       = {1},
  pages        = {458--466},
  publisher    = {American Institute of Physics},
  series       = {Journal of the Acoustical Society of America},
  title        = {Separating overlapping click trains originating from multiple individuals in echolocation recordings.},
  url          = {http://dx.doi.org/10.1121/1.3519404},
  volume       = {129},
  year         = {2011},
}