Animal classification. by by J. E. Webb and J. H. Elgood.


By by J. E. Webb and J. H. Elgood.

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All cetacean clicks fall into this category. 1 shows a sequence of cetacean clicks in the time domain. 1 Time domain of a series of Cuvier’s beaked whale clicks. 2 Time domain of a single Cuvier’s beaked whale click. 43 44 2 Cetacean sounds function of time (horizontal or time axis, measured in seconds) of a Cuvier’s beaked whale recorded by the author in the Mediterranean Sea. One can easily see that the recording is composed of a continuous noise with a slight amplitude offset from zero, and of recurring instances of positive and negative deflections from the noise, indicating the presence of a series of short transients, which in this case have been attributed to Cuvier’s beaked whale echolocation clicks followed by surface reflections.

6 Harbour porpoise A further class of cetacean clicks is represented by the harbour porpoise. 11 shows a typical harbour porpoise click; note that its duration is somewhat shorter than that of a Cuvier’s beaked whale click but with much more oscillation, indicating a higher frequency of the sound wave. Whereas bottlenose dolphins and sperm whales emit short pulses with few cycles, harbour porpoises emit relatively long pulses, not necessarily long in time but in terms of oscillations, albeit with significant amplitude modulation.

It uses then Leroy’s formula to estimate the sound speed at a selected location. /climatology/'; % Leroy = @(T,S,Z,L) . . ^3 . . *S . . ^3 . . ^3 . . dat(gd,4)); end %estimate sound speed sv=[D,Leroy(T,S,D,lat0)]; The Leroy formula of the sound speed is here given as what is called an anonymous function. If the function is used in different functions or scripts then it becomes convenient to program the functionality as a regular Matlab function. The script tries to use climatological data stored in a Matlab data file; if this file does not exist, the script will generate the file.

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