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Demonstration of a length limited parametric array.

Elizabeth Skinner1, Matthew Groves1, Mark K Hinders1

  • 1William & Mary Applied Science Department, Williamsburg, VA 23187-8795, United States.

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|May 7, 2019
PubMed
Summary
This summary is machine-generated.

This study demonstrates the length-limited effect using commercial parametric array speakers. Increased overlap of audio beams enhances this measurable phenomenon, confirming its practicality in air.

Keywords:
Directional sound beamLength-limited sound beamNonlinear sound propagationParametric acoustic arrayParametric loudspeaker

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Area of Science:

  • Acoustics
  • Signal Processing
  • Physics

Background:

  • Parametric arrays generate audible sound from ultrasonic waves.
  • The length-limited effect describes sound beam behavior influenced by array length.

Purpose of the Study:

  • To assess the practicality of a length-limited parametric array in air.
  • To demonstrate the measurability of the length-limited effect using commercial off-the-shelf components.

Main Methods:

  • Utilized two commercial parametric array speakers emitting co-propagating directional audio beams.
  • Generated 2 kHz audio signals and manipulated their relative phase for interference.
  • Varied the overlap of the audible sound beams to observe the length-limited effect.

Main Results:

  • The length-limited effect is a measurable phenomenon achievable with standard parametric array speakers.
  • Greater overlap between the audible sound beams amplified the length-limited effect.
  • Adjusting the sound magnitude of individual speakers did not significantly alter the effect.

Conclusions:

  • Confirms the practicality of length-limited parametric arrays in open air.
  • The degree of beam overlap is a critical factor in achieving the length-limited phenomenon.
  • Commercial parametric arrays are suitable for demonstrating and potentially utilizing this effect.