Highly Directional Acoustic Waves Generated by a Horned Parametric Acoustic Array Loudspeaker

L. H. Tong, S. K. Lai, J. W. Yan, C. Li

Research output: Journal article publicationJournal articleAcademic researchpeer-review

8 Citations (Scopus)


Acoustic horns can enhance the overall efficiency of loudspeakers to emanate highly directional acoustic waves. In this work, a theoretical model is developed to predict difference frequency acoustic fields generated by a parametric array loudspeaker (PAL) with a flared horn. Based on this model, analytical solutions are obtained for exponentially horned PALs. A numerical analysis on the performance of horned PALs subject to various horn parameters (i.e., horn length and flare constant) is implemented. To compare with nonhorned parametric acoustic array (PAA) devices, it is able to generate highly directional acoustic wave beams for a wide range of difference frequencies, in which the generated sound pressure levels at low frequencies can be significantly enhanced. In addition, the equivalent radius of a nonhorned emitter that matches the directivity achieved by a horned one is also quantitatively investigated. The present research will provide useful guidelines for the design and optimization of horned parametric array equipment.

Original languageEnglish
Article number011012
JournalJournal of Vibration and Acoustics, Transactions of the ASME
Issue number1
Publication statusPublished - 1 Feb 2019


  • flare constant
  • highly directional acoustic waves
  • horn length
  • parametric acoustic array

ASJC Scopus subject areas

  • Acoustics and Ultrasonics
  • Mechanics of Materials
  • Mechanical Engineering


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