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Related Experiment Videos

Optimal design of panel speaker array with omnidirectional characteristics.

Mingsian R Bai1, Kuochan Chung

  • 1msbai@cc.nctu.edu.tw

The Journal of the Acoustical Society of America
|November 15, 2002
PubMed
Summary

This study developed an array panel speaker system to solve high-frequency beaming issues. The optimized electronic compensation effectively achieved omnidirectional sound radiation without losing efficiency.

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Area of Science:

  • Acoustics
  • Signal Processing
  • Audio Engineering

Background:

  • Panel speaker systems, often used with projection screens, suffer from high-frequency beaming.
  • Large-dimension sound sources typically exhibit directional sound radiation at higher frequencies.

Purpose of the Study:

  • To develop an array panel speaker system that overcomes the inherent beaming problem.
  • To achieve an omnidirectional sound response and optimize array efficiency through electronic compensation.

Main Methods:

  • Integration of panel speakers into an array configuration.
  • Application of a three-stage optimization scheme with nonlinear, nonconvex objectives.
  • Implementation using a multichannel digital signal processor and Hilbert transformer for array coefficient processing.

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Main Results:

  • Successful tailoring of array coefficients to meet directional response specifications.
  • Validation of the implemented system through small array and large matrix construction.
  • Experimental confirmation of the proposed optimization technique's effectiveness.

Conclusions:

  • The developed optimization technique and electronic compensation effectively achieve omnidirectional radiation.
  • The system enhances audio performance for projection screen applications without efficiency loss.