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Broadband performance of an active headrest
B Rafaely1, S J Elliott, J Garcia-Bonito
1Institute of Sound and Vibration Research, University of Southampton, United Kingdom. br@isvr.soton.ac.uk
The Journal of the Acoustical Society of America
|August 27, 1999
Summary
This study demonstrates that feedback active headrests can effectively reduce broadband noise. Performance is optimized by minimizing sound pressure near the listener
Area of Science:
- Acoustics and Control Systems Engineering
Background:
- Active headrest systems have been explored for noise cancellation.
- Previous research focused on feedforward control for tonal disturbances.
- Broadband noise control in environments like aircraft and cars necessitates feedback systems.
Purpose of the Study:
- To design and evaluate robust feedback controllers for active headrest systems controlling broadband random acoustic disturbances.
- To investigate performance in the low-frequency range using laboratory data.
Main Methods:
- Development of robust feedback controllers tailored for broadband random disturbances.
- Utilizing measured data from a laboratory headrest system for controller design.
- Focusing on minimizing sound pressure at a "virtual microphone" near the listener's ears.
Main Results:
- Achieved practically useful performance in broadband noise attenuation.
- Demonstrated that controller design minimizing pressure at a virtual microphone is crucial.
- Showed maintained performance despite listener head movements.
Conclusions:
- Feedback active headrest systems can effectively attenuate broadband random noise.
- Optimized controller design and placement are critical for performance.
- The system shows promise for applications requiring wideband noise reduction.