Active noise control in enclosure with virtual microphone

Stéphane Renault, Franck Rymeyko, Alain Berry

Abstract


This study concerns local active noise control (ANC) in confined spaces. In cases where an active zone of quiet is intended in an enclosure, it is not always practical to place error microphones in this zone. Error microphones placed on the enclosure walls would sometimes be a more convenient solution. This article discusses the concept of a “virtual” microphone, which consists to generate a quiet zone distant from the error microphone used during control. Two virtual microphone algorithms are presented and experimentally tested. Such a virtual microphone technique has been implemented in the past for essentially fixed primary sources with respect to the enclosure (e.g. active control of propeller-induced aircraft cabin noise). The virtual microphone technique is especially examined here in the context of a moving primary source with respect to the enclosure (such as road traffic noise)

Keywords


active noise control; road traffic; error microphones; virtual microphone; local active noise control; confined spaces; quiet zone; fixed primary sources; propeller-induced aircraft cabin noise; moving primary source; road traffic noise

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