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On the Challenges of Acoustic Energy Mapping Using a WASN: Synchronization and Audio Capture.

Emiliano Ehecatl García-Unzueta1, Paul Erick Mendez-Monroy2, Caleb Rascon3

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Wireless Acoustic Sensor Networks (WASN) enable acoustic energy mapping but suffer from synchronization issues. Precision Time Protocol (PTP) with local audio recording offers the most reliable data capture for accurate sound source analysis.

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Area of Science:

  • Acoustics and Signal Processing
  • Wireless Sensor Networks
  • Real-time Data Acquisition

Background:

  • Acoustic energy mapping requires precise timing for accurate source localization using beamforming techniques.
  • Wireless Acoustic Sensor Networks (WASN) offer practical deployment but face challenges with inter-node synchronization.
  • Existing synchronization protocols may not meet the stringent timing requirements for reliable acoustic data capture.

Purpose of the Study:

  • To evaluate the impact of different synchronization protocols on data reliability in WASNs for acoustic energy mapping.
  • To compare Network Time Protocol (NTP) and Precision Time Protocol (PTP) for WASN synchronization.
  • To assess various audio data capture methodologies within a WASN framework.

Main Methods:

  • Implementation of a WASN using Raspberry Pi 4B+ nodes equipped with MEMS microphones.
  • Evaluation of Network Time Protocol (NTP) and Precision Time Protocol (PTP) for synchronizing WASN nodes.
  • Comparison of three audio capture strategies: local recording (two methods) and network transmission (one method).

Main Results:

  • Experimental results indicate that Precision Time Protocol (PTP) provides superior synchronization accuracy compared to NTP.
  • Local audio data recording methodologies demonstrated higher reliability than transmitting data over the wireless network.
  • The combination of PTP synchronization and local recording yielded the most dependable data for acoustic energy mapping.

Conclusions:

  • Precision Time Protocol (PTP) is the recommended synchronization method for WASNs intended for acoustic energy mapping.
  • Local audio recording is crucial for maintaining data integrity in WASN deployments.
  • Optimized synchronization and data capture are essential for accurate acoustic source characterization using WASNs.