There are many applications that can benefit from Active Noise Control (ANC) such as in aircraft cabins and air conditioning ducts, i.e. in situations where technology interferes with human hearing in a harmful way or disrupts communication. Headsets with analogue ANC circuits have been used in the armed forces for attenuating frequencies below 1 kHz, which when combined with passive filtering offers protection across the whole frequency range of human hearing. A dental surgery is also a noisy environment; in which dental drill noise is commonly off-putting for many patients and is believed to harm the dentist's hearing over a long period of time. However, dealing with dental drill noise is a different proposition from the applications mentioned above as the frequency range of the peak amplitudes goes from approximately 1.5 kHz to 12 kHz, whereas conventional ANC applications consider a maximum of 1.5 kHz. This paper will review the application of ANC at low frequencies and justify an approach for dealing with dental noise using digital technologies at higher frequencies. The limits of current ANC technologies will be highlighted and the means of improving performance for this dental application will be explored. In particular, technicalities of implementing filtering algorithms on a Digital Signal Processor will be addressed.


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    Title :

    Active noise control at high frequencies


    Additional title:

    Aktive Geräuschregelung bei hohen Frequenzen


    Contributors:


    Publication date :

    2006


    Size :

    8 Seiten, 4 Bilder, 19 Quellen



    Type of media :

    Conference paper


    Type of material :

    Storage medium


    Language :

    English








    ACTIVE NOISE CONTROL

    GUNASEELA BOOPATHY SENTHIL RAJA | European Patent Office | 2021

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