Swiftlet Vocalization in Echolocation

  • Authors

    • Nazriah Mahmud
    • Nor Hisham Khamis
    • Azli Yahya
    • Moktar Harun
    • Ameruddin Baharom
    • Kamal Khalil
    • Arif Abdul Rahim
    https://doi.org/10.14419/ijet.v7i3.36.29070

    Received date: April 30, 2019

    Accepted date: April 30, 2019

    Published date: May 6, 2018

  • 5G, Coaxial probe, grid array antenna, mobile communications.

  • Abstract

    The most interesting feature of swiftlet vocalizations is many of its species utilize a sonar-like system to navigate in the darkness of their nesting caves. This way of navigation called echolocation, where the birds produce click-like sound of which the returned echo provides information about the bird's speed and position relative to an object. In this paper, echo clicks were investigated from the sound recorded in a birdhouse. Fast Fourier Transform and Spectrogram were computed using MATLAB to each click pair for five consecutive pairs. Spectrogram analysis of the echolocation click pairs revealed maximum frequency where higher energy peaks occur is between 5.513 kHz to 6.801 kHz for the first click and between 6.202 to 8.613 kHz for the second click. As the conclusion, with the analysis conducted on the signals provides the potential to study the echolocation behavior of swiftlet in more details.

  • References

    1. Brinkløv, S., Fenton, M.B., Ratcliffe, J.M., "Echolocation in Oilbirds and swiftlets", Front. Physio, 4, (2013), pp.1-12
    2. Price, J.J., Johnson, K.P., Clayton, D.H., "The evolution of echolocation in swiftlets", 2, (2004), pp.135-143
    3. Thomassen, H.A., Wiersema, A.T., Bakker, M.A.G. De, Knijff, P. De, et al., "A new phylogeny of swiftlets ( Aves : Apodidae ) based on cytochrome- b DNA", Mol. Phylogenet. Evol., 29,(2003),pp. 86–93.
    4. Thomassen, H.A., Djasim, U.M., Povel, G.D., "Echoclick design in swiftlets : single as well as double click", Ibis,146, (2004), pp. 173–174.
    5. Suthers, R.A., Hector, D.H., "Mechanism for the Production of Echolocating Clicks by the Grey Swiftlet , Collocalia spodiopygia ", Journal of Comparative Physiology.A, 148, (1982),pp.457–470.
    6. Suthers, R.A., (2004) How birds sing and why it matters. In Nature's Music: the science of birdsong. Marler,P. and Slabbekoorn, H.eds. Elsevier. New York. Chapter 9, pp. 272-295
    7. Nematollahi, M.A., Al-Haddad, S.A.R., Ramli, A.R., Kassim, A., Hashim, S.J., "Frequency domain processing for artificial synthesis of swiftlet's sound Waves", Journal of Telecommunication and Computer Engineering, 9, (2017), pp.89-93.

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  • How to Cite

    Mahmud, N., Hisham Khamis, N., Yahya, A., Harun, M., Baharom, A., Khalil, K., & Abdul Rahim, A. (2018). Swiftlet Vocalization in Echolocation. International Journal of Engineering and Technology, 7(3.36), 10-12. https://doi.org/10.14419/ijet.v7i3.36.29070