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Marine mammal tonal vocalizations are studied to help marine biologists get a better knowledge of their behavioral context. The vocalizations are often analyzed by characterization of the frequency contours. An automated frequency contour extraction method extended by image-based technique is proposed. The spectrogram is first de-noised and then two binary images are derived with a low threshold and...
The biosonar system of marine mammals like dolphins and whales have experienced millions of years of evolution and achieved excellent underwater performance. Apart from the remarkable abilities of the biosonar system, marine mammal sounds can be directly used as the masking of active sonar detection. In this paper, we explore the feasibility of the whale-inspired signal for covert active sonar detection...
Conventional energy detection (CED) is the optimal signal detection in uncorrelated noise field. Subband peak energy detection (SPED) further improves the display resolution of CED by exploiting the spatial coherence of the energy peaks. However, under low signal to noise ratio (SNR) condition or where there are few snapshots, the performance of weak target detection submerged in strong interferences...
Ocean ambient noise is usually considered as an interfering background for underwater devices. As a key component of ocean ambient noise, marine biological noise also has a serious effect on sonar detection performance. It is found that marine mammal noise has a wide frequency band, with the energy mainly concentrating on low frequency band 10 ∼ 500 Hz and medium frequency band 500 Hz ∼ 25 kHz, which...
Previous studies using auditory sequences with rapid repetition of tones revealed that spatiotemporal cues and spectral cues are important cues used to fuse or segregate sound streams. However, the perceptual grouping was partially driven by the cognitive processing of the periodicity cues of the long sequence. Here, we investigate whether perceptual groupings (spatiotemporal grouping vs. frequency...
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