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A moving zone of quiet for narrowband noise in a one-dimensional duct using virtual sensing
J. Acoust. Soc. Am. Volume 121, Issue 3, pp. 1459-1470 (2007); (12 pages)
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Add to FacebookA frequent problem in active noise control is that the zone of quiet created at the error sensor tends to be very small. This means that the error sensor generally needs to be located close to an observer’s ear, which might not always be a convenient or feasible solution. Virtual sensing is a method that can move the zone of quiet away from the error sensor to a desired location that is spatially fixed. This method has been investigated previously, and has shown potential to improve the performance of an active noise control system. However, it is very likely that the desired location of the zone of quiet is not spatially fixed. An active noise control system incorporating a virtual sensing method thus has to be able to create a moving zone of quiet that tracks the observer’s ears. This paper presents a method for creating a moving zone of quiet based on the LMS virtual microphone technique. To illustrate the proposed method, it is implemented in an acoustic duct and narrowband control results are presented. These results show that a moving zone of quiet was effectively created inside the duct for narrowband noise.
© 2007 Acoustical Society of America
ACKNOWLEDGMENTS
The authors gratefully acknowledges the University of Adelaide for providing an ASI scholarship, and the Australian Research Council for supporting this research. We also acknowledge the editor, Dr. Kenneth A. Cunefare, for his constructive comments on the original manuscript.
Article Outline
- INTRODUCTION
- PROBLEM DEFINITION
- Acoustic duct arrangement
- Implementing the filtered-x LMS algorithm
- Moving virtual sensing algorithm
- Generating the virtual filtered-reference signal
- State-space model of system
- SPATIALLY FIXED VIRTUAL MICROPHONE
- LMS virtual microphone technique
- Modified LMS virtual microphone technique
- Optimal microphone weights
- MOVING VIRTUAL MICROPHONE
- LMS moving virtual microphone technique
- Practical implementation using spatial interpolation
- FILTERED-x LMS ALGORITHM
- Implementation
- Tracking
- ACOUSTIC DUCT EXPERIMENTS
- Experimental arrangement
- Experimental results
- Preliminary identification procedure
- Relative spatial change of primary and secondary sound fields over target zone
- Performance at moving virtual location
- CONCLUSIONS
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KEYWORDS and PACS
PACS
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Active noise control
ARTICLE DATA
History
Received 15 Sep 2005
Accepted 13 Dec 2006
Revised 04 Dec 2006
Accepted 13 Dec 2006
Revised 04 Dec 2006
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