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Wideband sound reproduction using a massive multi-channel focusing parametric array loudspeaker system.

Tao Zhuang1,2, Mengtong Li1,2, Shaozhe Li1,2

  • 1Key Laboratory of Modern Acoustics, Nanjing University, Nanjing 210093, China.

The Journal of the Acoustical Society of America
|October 22, 2025
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This study introduces a compact 576-channel focusing parametric array loudspeaker (PAL) for high-contrast, wideband audio control. The novel approach uses ultrasonic modulation for focused sound, offering a smaller alternative to traditional loudspeaker arrays.

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Area of Science:

  • Acoustics
  • Signal Processing
  • Loudspeaker Technology

Background:

  • Conventional electrodynamic loudspeaker (EDL) arrays face challenges in generating high-contrast, wideband audio in confined spaces due to size and processing complexity.
  • Achieving focused sound beams requires sophisticated multi-channel setups, limiting practical applications.

Purpose of the Study:

  • To develop a compact and efficient solution for high-contrast, wideband audio generation in targeted areas.
  • To demonstrate the feasibility of a massive multi-channel focusing parametric array loudspeaker (PAL) for advanced sound field control.

Main Methods:

  • Implementation of a 576-channel focusing parametric array loudspeaker (PAL) with compact 24x24cm dimensions.
  • Modulation of ultrasonic signals instead of wideband audio for focused beam control.
  • Utilizing field-programmable gate array (FPGA)-based ultrasonic delay control and single-digital-to-analog converter (DAC) modulation.

Main Results:

  • Successful demonstration of wideband sound reproduction using the massive multi-channel focusing PAL.
  • Experimental validation of effective focal sound reproduction.
  • Achieved compact size and reduced hardware/processing demands compared to conventional arrays.

Conclusions:

  • The developed compact focusing PAL offers a viable alternative to conventional EDL arrays for high-contrast, wideband sound field control.
  • This technology enables focused beam control with significantly reduced system complexity.
  • Presents a novel approach for advanced acoustic applications requiring precise sound localization.