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Sound radiation patterns in the frequency domain of cries from a vespertilionid bat

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Summary

Ultrasonic cries from an immobilized vespertilionid batMyotis daubentoni, were recorded simultaneously in front of the bat (on-axis), and at various off-axis angles. The differences between the on-axis and off-axis spectra were computed and related to the theory of directional emission from a baffled rigid-piston radiator. This theory implies zero radiation at a specific frequency for a given piston diameter and off-axis angle (Fig. 1). The bat's difference spectra showed notches of ca. 25 dB with properties as the zeros of the piston theory (Fig. 7). The structure of off-axis cries was found to be qualitatively predictable from the on-axis cries, using the piston theory (Fig. 4). The difference spectra had a complex, oscillatory fine-structure that could not be accounted for by the basic piston theory.

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References

  • Kuhl, W., Schodder, G.R., Schröder, F.K.: Condenser transmitters and microphones with solid dielectric for airborne ultrasonics. Acustica4, 519 (1954)

    Google Scholar 

  • Machmerth, D., Theiss, D., Schnitzler, H.-U.: Konstruktion eines Luftschallgebers mit konstantem Frequenzgang im Bereich von 15 kHz bis 130 kHz. Acustica34, 81–85 (1957)

    Google Scholar 

  • Morse, P.M.: Vibration and sound. London: McGraw-Hill 1948

    Google Scholar 

  • Shimozawa, T., Suga, N., Hendler, P., Schuetze, S.: Directional sensitivity of echolocation system in bats producing frequency-modulated signals. J. Exp. Biol.60, 53–70 (1974)

    Google Scholar 

  • Simmons, J.A.: Acoustic radiation patterns for the echolocating batsChilonycteris rubiginosa andEptesicus fuscus. J. Acoust. Soc. Am.46; 1054–1056 (1969)

    Google Scholar 

  • Strother, G.K., Mogus, M.: Acoustical beam patterns for bats: Some theoretical considerations. J. Acoust. Soc. Am.48, 1430–1432 (1970)

    Google Scholar 

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Authors and Affiliations

  1. Department of Zoophysiology, University of Aarhus, DK-8000, Aarhus C, Denmark

    Finn Mogensen & Bertel Møhl

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  1. Finn Mogensen
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  2. Bertel Møhl
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Supported by grants from the Danish Science Research Council for Natural Sciences

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Mogensen, F., Møhl, B. Sound radiation patterns in the frequency domain of cries from a vespertilionid bat. J. Comp. Physiol. 134, 165–171 (1979). https://doi.org/10.1007/BF00610475

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  • DOI: https://doi.org/10.1007/BF00610475

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