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Time-frequency analysis and modeling of the backscatter of categorized dolphin echolocation clicks for target discrimination
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10.1121/1.2932060
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    Affiliations:
    1 Department of Mechanical Engineering, University of Hawai’i at Manoa, 2540 Dole Street, Honolulu, Hawai’i 96822-2303 and Marine Mammal Research Program, Hawai’i Institute of Marine Biology, P.O. Box 1106, Kailua, Hawai’i 96734-1106
    2 Department of Mechanical Engineering, University of Hawai’i at Manoa, 2540 Dole Street, Honolulu, Hawai’i 96822-2303
    3 Marine Mammal Research Program, Hawai’i Institute of Marine Biology, P.O. Box 1106, Kailua, Hawai’i 96734-1106
    J. Acoust. Soc. Am. 124, 657 (2008); http://dx.doi.org/10.1121/1.2932060
/content/asa/journal/jasa/124/1/10.1121/1.2932060
http://aip.metastore.ingenta.com/content/asa/journal/jasa/124/1/10.1121/1.2932060

Figures

Image of FIG. 1.
FIG. 1.

Geometric setup for an echolocation click incident upon a solid, homogeneous elastic sphere.

Image of FIG. 2.
FIG. 2.

Scatter plot of root-mean-square bandwidth vs center frequency of the collected clicks.

Image of FIG. 3.
FIG. 3.

(Color online) Bayesian information criterion vs number of clusters of four clustering models. The data suggest that four clusters are optimal.

Image of FIG. 4.
FIG. 4.

(Color online) Scatter plot of the data presented in Fig. 2 clustered into four classes.

Image of FIG. 5.
FIG. 5.

(Color online) Examples of the different click types emitted by the dolphin: (a) class I, (b) class II, (c) class III, and (d) class IV. The signal wave form is shown above the respective normalized frequency spectrum. Above the wave forms are the center frequency and rms bandwidth measurements.

Image of FIG. 6.
FIG. 6.

(Color online) Examples of the different echo signals calculated from clicks from each of the four classes by using the scattering algorithm; (a) class I, (b) class II, (c) class III, and (d) class IV. The signal wave form is shown above the respective normalized frequency spectrum.

Image of FIG. 7.
FIG. 7.

(Color online) Comparisons between echo spectra calculated from the scattering model and echo spectra calculated by using the experimentally obtained transfer function for each class: (a) class I, (b) class II, (c) class III, and (d) class IV.

Image of FIG. 8.
FIG. 8.

(Color online) RIDs of the echo signature returned by a steel sphere for each of the four classes of clicks; (a) class I, (b) class II, (c) class III, and (d) class IV.

Image of FIG. 9.
FIG. 9.

(Color online) RIDs of the echo signature returned by a brass sphere for each of the four classes of clicks; (a) class I, (b) class II, (c) class III, and (d) class IV.

Image of FIG. 10.
FIG. 10.

(Color online) RIDs of the echo signature returned by an iron sphere for each of the four classes of clicks; (a) class I, (b) class II, (c) class III, and (d) class IV.

Image of FIG. 11.
FIG. 11.

(Color online) RIDs of the echo signature returned by a lead sphere for each of the four classes of clicks; (a) class I, (b) class II, (c) class III, and (d) class IV.

Tables

Generic image for table
TABLE I.

Elastic parameters of the spheres.

Generic image for table
TABLE II.

Summary of average click signal characteristics: -to-peak source level in dB , frequency, and -mean-square bandwidth.

Generic image for table
TABLE III.

RID correlation values of the standard target (steel sphere) vs the comparison targets.

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/content/asa/journal/jasa/124/1/10.1121/1.2932060
2008-07-01
2014-04-19
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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Time-frequency analysis and modeling of the backscatter of categorized dolphin echolocation clicks for target discrimination
http://aip.metastore.ingenta.com/content/asa/journal/jasa/124/1/10.1121/1.2932060
10.1121/1.2932060
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