The Matched Reassignment Applied to Echolocation Data

Previous studies have shown that measurements of beluga whale (Delphinapterus leucas) and bottlenose dolphin (Tur-siops truncatus) echolocation signals at off-axis angles may be well modeled using a Gaussian bell function or a chirped Gaussian function as envelope. In this paper, we apply a novel te...

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Bibliographic Details
Main Authors: Brynolfsson, Johan, Reinhold, Isabella, Starkhammar, Josefin, Sandsten, Maria
Format: Conference Proceeding
Language:English
Subjects:
Analytical models
Dolphins
echolocation signals
Entropy
envelope model
Microsoft Windows
reassignment
Spectrogram
time-frequency localization
transient
Transient analysis
Whales
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Summary:Previous studies have shown that measurements of beluga whale (Delphinapterus leucas) and bottlenose dolphin (Tur-siops truncatus) echolocation signals at off-axis angles may be well modeled using a Gaussian bell function or a chirped Gaussian function as envelope. In this paper, we apply a novel technique, the matched window reassignment, for investigation of a range of models of dolphin echolocation transients. Using a set of parameterized skewed envelopes and a dictionary-based estimation algorithm, it is shown that the Rényi entropy can be used as an evaluation measure of the model fit. Acoustic recordings from an array of hydrophones of a beluga's echolocation signal are investigated, where the Gaussian envelope frequency modulation function resulted in the lowest Rényi entropy mean and the two-parametric Gum-bel model showed the best observed fit.
ISSN:2379-190X
DOI:10.1109/ICASSP.2019.8683441