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Updated: May 29, 2025

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A nonlinear sound field control method for a multi-channel parametric array loudspeaker array.

Yunxi Zhu1,2, Liwen Qin1,2, Wenyao Ma1,2

  • 1Key Laboratory of Noise and Vibration Research, Institute of Acoustics, Chinese Academy of Sciences Beijing, 100190, People's Republic of China.

The Journal of the Acoustical Society of America
|February 7, 2025
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Summary
This summary is machine-generated.

This study introduces nonlinear sound field control for parametric array loudspeakers (PALs) to overcome indoor acoustic challenges. The new method improves directivity and sound quality in complex environments.

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Area of Science:

  • Acoustics
  • Signal Processing
  • Nonlinear Acoustics

Background:

  • Parametric array loudspeakers (PALs) offer high directivity but suffer from reduced performance in indoor environments due to scattering and reflections.
  • Existing linear sound field control methods are ineffective for PALs because of nonlinear coupling between channels, as described by the Westervelt equation.
  • PALs often exhibit low radiation efficiency due to inefficient nonlinear sound conversion.

Purpose of the Study:

  • To propose a novel framework for nonlinear sound field control of PALs in complex acoustic environments.
  • To develop a sound control algorithm that enhances radiation efficiency and acoustic contrast for PALs.
  • To address the limitations of linear control methods in managing nonlinear sound fields generated by PALs.

Main Methods:

  • Development of a nonlinear sound field control framework based on the Westervelt equation.
  • Design of a two-stage non-convex optimization algorithm to maximize radiation efficiency and acoustic contrast.
  • Utilizing simulations and experimental validation to assess the proposed framework and algorithm.

Main Results:

  • The proposed nonlinear control framework effectively manipulates sound fields generated by PALs in complicated acoustic environments.
  • The developed algorithm successfully suppresses undesired audible sound in dark zones while preserving desired sound in bright zones.
  • Enhanced acoustic contrast and improved performance of PALs in real-world scenarios with scattering and reflections were demonstrated.

Conclusions:

  • The proposed nonlinear sound field control framework and algorithm significantly improve PAL performance in challenging indoor acoustics.
  • This approach overcomes the limitations of linear control methods by addressing nonlinearities inherent in PALs.
  • The study validates the effectiveness of nonlinear control for enhancing directivity and sound quality in practical applications.