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Related Experiment Videos

Experimental validation of spatial Fourier transform-based multiple sound zone generation with a linear loudspeaker

Takuma Okamoto1, Atsushi Sakaguchi2

  • 1National Institute of Information and Communications Technology, 3-5, Hikaridai, Seika-cho, Soraku-gun, Kyoto, 619-0289, Japan.

The Journal of the Acoustical Society of America
|April 5, 2017
PubMed
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This study validates a new analytical method for controlling sound zones using loudspeakers. The proposed approach with a Hann window demonstrated superior accuracy in creating bright and dark acoustic zones compared to traditional methods.

Area of Science:

  • Acoustics
  • Signal Processing
  • Array Signal Processing

Background:

  • Acoustic zone generation is crucial for applications like personal sound systems and multilingual guides.
  • Conventional methods often rely on complex numerical solutions.
  • Analytical approaches offer a potentially more efficient alternative.

Purpose of the Study:

  • To experimentally validate an analytical approach for generating acoustic bright and dark zones.
  • To compare the proposed method's effectiveness against conventional techniques in real-world conditions.

Main Methods:

  • An analytical method utilizing spatial Fourier transform with a linear loudspeaker array was employed.
  • Experimental validation was performed using a 64-loudspeaker array in an anechoic chamber.

Related Experiment Videos

  • The proposed approach, with rectangular and Hann windows, was compared to delay-and-sum beamforming, contrast maximization, and least squares-based pressure matching.

    • Main Results:

    • Both computer simulations and experimental results showed the proposed approach's effectiveness.
    • The analytical method with a Hann window provided more accurate control over acoustic zones.
    • The proposed method outperformed conventional techniques in controlling bright and dark zones.

    Conclusions:

    • The proposed analytical approach offers a more accurate method for controlling acoustic bright and dark zones.
    • Experimental validation confirms the effectiveness of the spatial Fourier transform-based method.
    • The Hann window is particularly effective when combined with the proposed analytical technique for precise acoustic control.