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EMD-Based Energy Spectrum Entropy Distribution Signal Detection Methods for Marine Mammal Vocalizations.

Chai-Sheng Wen1, Chin-Feng Lin1, Shun-Hsyung Chang2

  • 1Department of Electrical Engineering, National Taiwan Ocean University, Keelung 20224, Taiwan.

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|July 8, 2023
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Summary
This summary is machine-generated.

This study introduces a new passive acoustic monitoring system using empirical mode decomposition and information theory to detect marine mammal vocalizations. The concentrated energy spectrum entropy distribution (CESED) detector significantly improves accuracy in identifying these sounds.

Keywords:
detectionempirical mode decompositionenergy spectrum entropyreceiver operating characteristics

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Area of Science:

  • Marine Biology
  • Acoustics
  • Signal Processing

Background:

  • Passive acoustic monitoring is crucial for marine mammal research.
  • Complex marine environments pose challenges for accurate vocalization detection.
  • Existing methods require enhancement for nonstationary signal analysis.

Purpose of the Study:

  • To develop an advanced passive acoustic monitoring system for marine mammal diversity detection.
  • To adapt signal processing techniques for complex marine acoustic environments.
  • To improve the accuracy and efficiency of marine mammal sound detection.

Main Methods:

  • Utilized empirical mode decomposition for nonstationary signal analysis.
  • Introduced energy characteristics analysis and information theory entropy.
  • Developed a detection algorithm with five steps: sampling, energy analysis, marginal frequency distribution, feature extraction, and detection.
  • Evaluated four signal feature extraction algorithms: ERD, ESD, ESED, and CESED.

Main Results:

  • The concentrated energy spectrum entropy distribution (CESED) detector demonstrated superior performance.
  • CESED achieved an Area Under the Curve (AUC) of 0.8979 and an Accuracy of 80.84% for blue whale vocalizations.
  • Compared to ERD, ESD, and ESED, CESED showed significantly higher Precision, Recall, and F1 scores.

Conclusions:

  • The CESED detector is highly effective for efficient sound detection of marine mammals.
  • The developed passive acoustic monitoring system offers a robust solution for marine biodiversity assessment.
  • This approach advances the capability to study marine mammals in challenging environments.