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Acoustic imaging with spherical microphone array and Kriging.

Thomas Padois1, Julien St-Jacques1, Kévin Rouard1

  • 1Department of Mechanical Engineering, École de Technologie Supérieure, 1100 Rue Notre Dame O, Montréal, Québec, H3C 1K3,Canada.

JASA Express Letters
|April 25, 2023
PubMed
Summary

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This summary is machine-generated.

Kriging enhances acoustic imaging by virtually increasing microphone array size, improving image resolution. This method effectively reduces mainlobe width for clearer sound source localization.

Area of Science:

  • Acoustics
  • Signal Processing
  • Geostatistics

Background:

  • Acoustic imaging relies on spherical microphone arrays (SMA) and beamforming techniques like conventional beamforming (CBF) and spherical harmonic beamforming (SHB).
  • Low-frequency acoustic imaging resolution is constrained by the SMA's physical radius (for CBF) or the number of microphones/spherical harmonic order (for SHB).

Purpose of the Study:

  • To introduce and evaluate Kriging as a method to virtually enhance the effective aperture of an SMA.
  • To demonstrate Kriging's ability to reduce mainlobe width and improve acoustic image quality.

Main Methods:

  • Application of Kriging interpolation to simulate an increased SMA radius and/or microphone count.
  • Performance evaluation using numerical simulations and experimental acoustic measurements.

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  • Comparison of acoustic images generated with and without Kriging-enhanced beamforming.

    • Main Results:

    • Kriging effectively simulates a larger SMA radius and/or more microphones.
    • The Kriging method significantly reduces the mainlobe width in both CBF and SHB.
    • Improved acoustic image resolution and source localization accuracy were observed.

    Conclusions:

    • Kriging is a powerful tool for enhancing acoustic imaging resolution with SMAs.
    • This geostatistical approach offers a cost-effective way to achieve better performance without physically altering the microphone array.
    • Kriging provides a viable solution for improving acoustic image quality in low-frequency applications.