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Related Experiment Videos

Novel active noise-reducing headset using earshell vibration control.

Boaz Rafaely1, Joao Carrilho, Paolo Gardonio

  • 1Institute of Sound and Vibration Research, University of Southampton, United Kingdom. br@isvr.soton.ac.uk

The Journal of the Acoustical Society of America
|October 26, 2002
PubMed
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This study introduces a novel active noise-reducing (ANR) headset that controls earshell vibration to reduce noise. This method shows potential for effective noise reduction, particularly at lower frequencies.

Area of Science:

  • Acoustics
  • Mechanical Engineering
  • Signal Processing

Background:

  • Active noise-reducing (ANR) headsets commonly use passive attenuation and active noise control for broadband noise reduction.
  • Existing ANR systems face limitations in effectively reducing low-frequency noise.
  • Earshell vibration is a significant pathway for external noise transmission to the user's ear.

Purpose of the Study:

  • To present a novel ANR headset design that mitigates noise by controlling earshell vibration.
  • To investigate the theoretical feasibility and practical potential of earshell vibration control for noise reduction.
  • To explore the use of force actuators and feedback control for enhanced ANR performance.

Main Methods:

  • Theoretical analysis using model-based velocity feedback control.

Related Experiment Videos

  • Control simulations utilizing experimental data from a laboratory headset.
  • Real-time control experiments at a single frequency to verify noise reduction via earshell vibration control.

    • Main Results:

    • Model-based analysis indicates piezoelectric actuators are suitable but require lower stiffness for better low-frequency performance.
    • Control simulations suggest a robust feedback controller can achieve good practical performance.
    • Experimental verification confirms that controlling earshell vibration can indeed reduce noise.

    Conclusions:

    • The novel ANR headset design effectively reduces noise by controlling earshell vibration.
    • The proposed method shows promise for improving low-frequency noise reduction in ANR headsets.
    • Further development with optimized actuators and controllers could lead to enhanced ANR systems.