Compact Unidirectional Audio Speaker

  • Context: High School 
  • Thread starter Thread starter 1MK5
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SUMMARY

The discussion focuses on the need for a compact unidirectional audio speaker suitable for a small PCB board (approximately 5x5 cm) for a science project aimed at detecting movement. User 1MK5 emphasizes that the directivity of a speaker is influenced by the ratio of wavelength to diameter, suggesting that a speaker or speaker array must be sufficiently large to achieve reasonable directionality. The recommendation includes using four small ultrasound transducers positioned at the corners of the PCB, operating at high frequencies to enhance directionality. Additional theoretical insights can be found on the provided Wikipedia link regarding directional sound.

PREREQUISITES
  • Understanding of audio speaker directivity and its dependence on wavelength and diameter
  • Familiarity with PCB design and component mounting
  • Knowledge of ultrasound transducers and their applications
  • Basic principles of sound wave propagation and attenuation
NEXT STEPS
  • Research compact unidirectional speakers and their specifications for PCB integration
  • Explore the design and implementation of ultrasound transducer arrays
  • Study the principles of sound wave directionality and its mathematical modeling
  • Investigate high-frequency audio applications and their effects on sound propagation
USEFUL FOR

Electronics engineers, audio engineers, students working on sound detection projects, and anyone involved in the design of compact audio systems.

1MK5
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Hi everyone,

I am posting this thread just to find some information.

I have a science project which try to make a compact directional sound for detecting movement.

Now, the electronics which my group is developing is on a small PCB board (approximately 5x5 cm)

I am wondering if there are anyone here could suggest if there is a commercial compact (small) unidirectional speaker which I can mount on the PCB?

I have tried a Google search: Directional Speaker, or Unidirectional Audio speaker; and it gives me a list of large-size directional audio speaker for home or office applications.

Finally, I'd like to thanks in advance to everyone in the forum.

Cheers,

1MK5
 
Physics news on Phys.org
Directivity in a speaker is dependent on the ratio of wavelenth to diameter.
Your speaker (or speaker array) will have to be at least as big as the wavelength to get reasonable directionality. Your best bet might be using four small ultrasound transducers in the corners of the PCB and making the frequency as high as practicable. (Attenuation)
You´ll find links to theory here: http://en.wikipedia.org/wiki/Directional_Sound
 

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