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A convolution model for computing the far-field directivity of a parametric loudspeaker array.

Chuang Shi1, Yoshinobu Kajikawa1

  • 1Department of Electrical and Electronic Engineering, Kansai University, 3-3-35 Yamatecho, Suita, Osaka Prefecture, 564-8680, Japan.

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Summary
This summary is machine-generated.

This study introduces a new method for calculating the far-field directivity of parametric loudspeaker arrays (PLAs). The improved model enhances agreement with measured data at minimal computational expense.

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Area of Science:

  • Acoustics
  • Signal Processing
  • Array Technology

Background:

  • Parametric loudspeaker arrays (PLAs) utilize nonlinear acoustic effects for directional sound.
  • Accurate prediction of far-field directivity is crucial for steerable PLA applications.
  • Existing methods using only product directivity show discrepancies with measured data.

Purpose of the Study:

  • To develop an improved method for computing the far-field directivity of parametric loudspeaker arrays (PLAs).
  • To enhance the accuracy of directivity predictions for steerable PLAs.
  • To achieve better agreement between computed and measured directivity with low computational overhead.

Main Methods:

  • Applying phased array techniques to implement steerable parametric loudspeakers.
  • Proposing a convolution model that combines product directivity and Westervelt's directivity.
  • Comparing computed directivity from the new model with measured data.

Main Results:

  • The proposed convolution model significantly improves agreement with measured far-field directivity.
  • The enhanced accuracy is achieved with a negligible increase in computational cost.
  • The method validates the application of phased array techniques for steerable PLAs.

Conclusions:

  • The convolution of product and Westervelt's directivity offers a superior method for PLA far-field directivity computation.
  • This approach provides a practical and accurate solution for designing steerable parametric loudspeaker systems.
  • The findings contribute to advancements in acoustic array technology and directional sound systems.