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Kenji Ishikawa1, Yoshifumi Shiraki1, Takehiro Moriya1

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This study introduces a new method to measure parametric acoustic arrays (PAA) without microphone-induced noise. Optical interferometry eliminates spurious sound, ensuring accurate audio measurements.

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Area of Science:

  • Acoustics
  • Optical Physics
  • Signal Processing

Background:

  • Parametric acoustic arrays (PAA) are often measured using microphones.
  • Microphone nonlinearity generates spurious sound, interfering with accurate PAA measurements.

Purpose of the Study:

  • To propose a spurious-sound-free measurement method for PAA.
  • To validate the proposed method against numerical simulations.

Main Methods:

  • Utilizing optical interferometry for PAA measurement.
  • Employing Gaussian beam expansion to enhance optical measurement.
  • Comparing results with finite element method (FEM) numerical simulations.

Main Results:

  • The proposed optical interferometry method successfully measured the demodulated audio sound.
  • No spurious sound effects were observed in the measurements.
  • Comparison with FEM simulations confirmed the accuracy of the proposed method.

Conclusions:

  • Optical interferometry provides a robust solution for spurious-sound-free PAA measurement.
  • This method overcomes the limitations of traditional microphone-based measurements.
  • Accurate PAA characterization is achievable without acoustic noise interference.