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Animal Sonar pp 295-299 | Cite as

The Perception of Complex Echoes by an Echolocating Dolphin

  • Whitlow W. L. Au
  • Patrick W. B. Moore
Part of the NATO ASI Science book series (NSSA, volume 156)

Abstract

Dolphins echolocate with short transient broadband acoustic signals having time-resolution constants between 12 and 15 μs (Au, 1980). Received echoes are often complex and considerably longer in duration than the transmitted signal, having many resolvable highlights or echo components. Echo highlights come from signal reflection at external and internal boundaries of a target and from the presence of different propagational modes within a target. The purpose of this study was to investigate how dolphins perceive and characterize the strength of complex echoes.

Keywords

Energy Detector Target Present Trial Target Absent Trial Critical Interval Absent Trial 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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References

  1. Au, W.W.L., and Penner, R.H., 1981, Target Detection in Noise by Echolocating Atlantic Bottlenose Dolphins, J. Acoust. Soc. Am., 70: 687–693.CrossRefGoogle Scholar
  2. Johnson, C.S., 1968, Relation between Absolute threshold and Duration-ofTone Pulses in the Bottlenosed Porpoise, J. Acoust. Soc. Am., 43: 757–763.PubMedCrossRefGoogle Scholar
  3. Moore, P.W.B., Hall, R.W., Friedl, W.A. and Nachtigall, P.E., 1984, The Critical Interval in Dolphin Echolocation: What is it? J. Acoust. Soc. Am., 76: 314–317.PubMedCrossRefGoogle Scholar
  4. Vel’mín, V.A., and Dubrovskiy, N.A., 1976, The Critical Interval of Active Hearing in Dolphins, Sov. Phys. Acoust., 2: 351–352.Google Scholar

Copyright information

© Plenum Press, New York 1988

Authors and Affiliations

  • Whitlow W. L. Au
    • 1
  • Patrick W. B. Moore
    • 1
  1. 1.Naval Ocean Systems CenterKailuaUSA

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