Adaptive Energy-Based Acoustic Sperm Whale Echolocation Click Detection


Sperm whales (Physeter macrocephalus) generate a series of broadband impulsive echolocation signals referred to as clicks when diving looking for prey. These acoustic signals will be divided into usual clicks and creak clicks. They have a frequency spectrum that lies primarily between 2 and 18 kHz. During this paper, an adaptive energy-based mostly click detector known as the adaptive Teager energy operator (ATEO) is developed. A windowing technique is used to account for the time-varying characteristics of these signals, and therefore the window length is customized by estimating the interclick interval (ICI). The usual clicks and creak clicks are classified via ICI variations. The proposed methodology is compared with many well-known techniques using real information provided by the Atlantic Undersea Test and Evaluation Center (AUTEC). Performance results are presented that show that the proposed technique could be a strong and efficient detector that may improve the press detection true positive rate (TPR) in addition to scale back the false positive rate (FPR).

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