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Sound Source Localization Using Non-Conformal Surface Sound Field Transformation Based on Spherical Harmonic Wave

Lanyue Zhang1,2, Dandan Ding3, Desen Yang4,5

  • 1Science and Technology on Underwater Acoustic Laboratory, Harbin Engineering University, Harbin 150001, China. zhanglanyue@hrbeu.edu.cn.

Sensors (Basel, Switzerland)
|May 11, 2017
PubMed
Summary

This study introduces a non-conformal sound field transformation method for spherical microphone arrays. This technique improves sound source localization accuracy, especially for cylindrical surfaces, extending array applications.

Keywords:
non-conformal sound field surface transformationreconstruction of sound fieldsound source localizationspherical harmonic wave decomposition

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Area of Science:

  • Acoustics and Signal Processing
  • Array Signal Processing

Background:

  • Spherical microphone arrays enable 3D sound source localization.
  • Conventional methods struggle with cylindrical sound sources due to conformal surface limitations.

Purpose of the Study:

  • To propose a non-conformal sound field transformation method for spherical arrays.
  • To enable accurate sound source localization on cylindrical surfaces.

Main Methods:

  • Developed a transfer matrix using spherical harmonic wave decomposition.
  • Achieved spherical-to-cylindrical surface transformation using array data.
  • Validated through theoretical deduction, simulation, and experimental testing.

Main Results:

  • Successfully demonstrated non-conformal spherical-to-cylindrical surface sound field transformation.
  • Achieved a localization deviation of approximately 0.01 m.
  • Attained a sound source localization resolution of around 0.3 m.

Conclusions:

  • The proposed method enhances spherical microphone array applications.
  • Improved sound source localization accuracy and resolution are achieved.
  • Overcomes limitations of conventional conformal transforms for specific geometries.