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Evaluation of seven time-frequency representation algorithms applied to broadband echolocation signals

Starkhammar, Josefin LU and Sandsten, Maria LU (2015) In Advances in Acoustics and Vibration 2015.
Abstract
Time-frequency representation algorithms such as spectrograms have proven to be useful tools in marine biosonar signal analysis. Although there are several different time-frequency representation algorithms designed for different types of signals with various characteristics, it is unclear which algorithms that are best suited for transient signals, like the echolocation signals of echolocating whales. This paper describes a comparison of seven different time-frequency representation algorithms with respect to their usefulness when it comes to marine biosonar signals. It also provides the answer to how close in time and frequency two transients can be while remaining distinguishable as two separate signals in time-frequency... (More)
Time-frequency representation algorithms such as spectrograms have proven to be useful tools in marine biosonar signal analysis. Although there are several different time-frequency representation algorithms designed for different types of signals with various characteristics, it is unclear which algorithms that are best suited for transient signals, like the echolocation signals of echolocating whales. This paper describes a comparison of seven different time-frequency representation algorithms with respect to their usefulness when it comes to marine biosonar signals. It also provides the answer to how close in time and frequency two transients can be while remaining distinguishable as two separate signals in time-frequency representations. This is, for instance, relevant in studies where echolocation signal component azimuths are compared in the search for the exact location of their acoustic sources. The smallest time difference was found to be 20 µs and the smallest frequency difference 49 kHz of signals with a −3 dB bandwidth of 40 kHz. Among the tested methods, the Reassigned Smoothed Pseudo Wigner-Ville distribution technique was found to be the most capable of localizing closely spaced signal components. (Less)
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author
organization
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Contribution to journal
publication status
published
subject
in
Advances in Acoustics and Vibration
volume
2015
publisher
Hindawi Publishing Corporation
external identifiers
  • scopus:84938149050
ISSN
1687-6261
DOI
10.1155/2015/342503
language
English
LU publication?
yes
id
68ecdaae-03c3-474b-9709-e79e405d1de7 (old id 8310624)
date added to LUP
2015-12-11 13:15:59
date last changed
2017-03-13 13:12:13
@article{68ecdaae-03c3-474b-9709-e79e405d1de7,
  abstract     = {Time-frequency representation algorithms such as spectrograms have proven to be useful tools in marine biosonar signal analysis. Although there are several different time-frequency representation algorithms designed for different types of signals with various characteristics, it is unclear which algorithms that are best suited for transient signals, like the echolocation signals of echolocating whales. This paper describes a comparison of seven different time-frequency representation algorithms with respect to their usefulness when it comes to marine biosonar signals. It also provides the answer to how close in time and frequency two transients can be while remaining distinguishable as two separate signals in time-frequency representations. This is, for instance, relevant in studies where echolocation signal component azimuths are compared in the search for the exact location of their acoustic sources. The smallest time difference was found to be 20 µs and the smallest frequency difference 49 kHz of signals with a −3 dB bandwidth of 40 kHz. Among the tested methods, the Reassigned Smoothed Pseudo Wigner-Ville distribution technique was found to be the most capable of localizing closely spaced signal components.},
  author       = {Starkhammar, Josefin and Sandsten, Maria},
  issn         = {1687-6261},
  language     = {eng},
  publisher    = {Hindawi Publishing Corporation},
  series       = {Advances in Acoustics and Vibration},
  title        = {Evaluation of seven time-frequency representation algorithms applied to broadband echolocation signals},
  url          = {http://dx.doi.org/10.1155/2015/342503},
  volume       = {2015},
  year         = {2015},
}