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Title: Dental drill noise reduction using a combination of active noise control, passive noise control and adaptive filtering
Authors: Kaymak, E
Atherton, MA
Rotter, K
Millar, B
Keywords: Dental drills;Passive Noise Control (PNC);Adaptive Filtering (AF);Active Noise Control (ANC)
Issue Date: 2007
Publisher: Turkish Acoustical Society
Citation: Inter-noise 2007, Istanbul, Turkey: 110 - 118, 29-31 Aug 2007
Abstract: Dental drills produce a characteristic high frequency, narrow band noise that is uncomfortable for patients and is also known to be harmful to dentists under prolonged exposure. It is therefore desirable to protect the patient and dentist whilst allowing two-way communication. A solution is to use a combination of the three main noise control methods, namely, Passive Noise Control (PNC), Adaptive Filtering (AF) and Active Noise Control (ANC). This paper discusses the application of the three methods to reduce dental drill noise while allowing two-way communication. Experimental setup for measuring the noise reduction by PNC is explained and results from different headphones and headphone types are presented. The implementation and results of an AF system using the Least Mean Square (LMS) algorithm are shown. ANC requires a modification of the LMS algorithm due to the introduction of the electro-acoustical cancellation path transfer function to compensate for the delays introduced by the control system. Therefore a cancellation path transfer function modeling method based on the filtered reference LMS (FXLMS) algorithm is presented along with preliminary results of the implementation.
ISBN: 9781605603858
Appears in Collections:Mechanical and Aerospace Engineering
Dept of Mechanical Aerospace and Civil Engineering Research Papers

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