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Achieving 3D Beamforming by Non-Synchronous Microphone Array Measurements.

Liang Yu1, Qixin Guo2, Ning Chu3

  • 1Institute of Vibration, Shock and Noise, State Key Laboratory of Mechanical System and Vibration, Shanghai Jiao Tong University, Shanghai 200240, China.

Sensors (Basel, Switzerland)
|December 23, 2020
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Summary
This summary is machine-generated.

Non-synchronous measurements enhance 3D beamforming for improved sound source localization and acoustic imaging. This method reduces microphone requirements while expanding frequency range and resolution.

Keywords:
3D beamformingnon-synchronous measurementssound sources localization

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Area of Science:

  • Acoustics
  • Signal Processing
  • Array Signal Processing

Background:

  • Beamforming is crucial for acoustic imaging, sound source localization, and noise reduction.
  • Traditional beamforming uses synchronous measurements from microphone arrays.
  • Moving microphone arrays with non-synchronous measurements improve 2D sound source localization accuracy.

Purpose of the Study:

  • To extend non-synchronous measurement techniques to 3D beamforming.
  • To enhance the resolution and coverage of 3D acoustic imaging.
  • To reduce the number of microphones needed for accurate sound source localization.

Main Methods:

  • Application of non-synchronous measurements in 3D beamforming with arrays enveloping the sound source space.
  • Comparison of conventional planar array beamforming with non-synchronous measurements using orthogonal and non-orthogonal moving arrays.
  • Validation through simulations and experimental data.

Main Results:

  • Non-synchronous measurements improve 3D acoustic imaging resolution and expand the effective frequency range.
  • Virtualized large or high-density microphone arrays enhance coverage of the radiated object.
  • Reduced microphone count compared to synchronous measurement methods.
  • Non-orthogonal moving arrays demonstrate good 3D source localization resolution.

Conclusions:

  • Non-synchronous measurements are effective for 3D beamforming, offering improved resolution and reduced hardware requirements.
  • The proposed method provides a viable alternative to conventional synchronous beamforming for 3D acoustic imaging and sound source localization.
  • Non-orthogonal array movements show promise for high-resolution 3D source identification.