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Bottlenose dolphin echolocation clicks characteristics acquisition and analysis

Bottlenose dolphins use broadband, ultrasonic echolocation signals to search for, localize, classify, recognize and approach preys. Bottlenose dolphins demonstrate an adaptive control ability by adjusting echolocation click signal, but little is known of the manner or degree with which control. So it is very important to do some research on the characteristic analysis of the dolphin clicks and provide the support for new type underwater acoustic equipment development. In this paper, Echolocation clicks performing discrimination object tasks in order to investigate differential click signals were collected from bottlenose dolphin with established acquisition system for high frequency and broadband signals. Based on the number of the waves composing the click, the click signals fall into 5 classes that is one wave, two waves, three waves, four waves, five and above. Time-frequency characteristic and fuzzy function characteristic of the 5 classes clicks were acquired by the signal processing and analyzing.