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    Critical ratios of beluga whales (Delphinapterus leucas) and masked signal duration

    Access Status
    Fulltext not available
    Authors
    Erbe, Christine
    Date
    2008
    Type
    Journal Article
    
    Metadata
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    Citation
    Erbe, C. 2008. Critical ratios of beluga whales (Delphinapterus leucas) and masked signal duration. Journal of the Acoustical Society of America. 124 (4): pp. 2216-2223.
    Source Title
    Journal of the Acoustical Society of America
    DOI
    10.1121/1.2970094
    Additional URLs
    http://www.ncbi.nlm.nih.gov/pubmed/19062860
    ISSN
    0001-4966
    URI
    http://hdl.handle.net/20.500.11937/22234
    Collection
    • Curtin Research Publications
    Abstract

    This article examines the masking of a complex beluga vocalization by natural and anthropogenic noise. The call consisted of six 150ms pulses exhibiting spectral peaks between 800Hz and 8kHz. Comparing the spectra and spectrograms of the call and noises at detection threshold showed that the animal did not hear the entire call at threshold. It only heard parts of the call in frequency and time. From the masked hearing thresholds in broadband continuous noises, critical ratios were computed. Fletcher critical bands were narrower than either 15 or 111 of an octave at the low frequencies of the call (<2kHz), depending on which frequency the animal cued on. From the masked hearing thresholds in intermittent noises, the audible signal duration at detection threshold was computed. The intermittent noises differed in gap length, gap number, and masking, but the total audible signal duration at threshold was the same: 660ms. This observation supports a multiple-looks model. The two amplitude modulated noises exhibited weaker masking than the unmodulated noises hinting at a comodulation masking release.

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