Abstract
Active noise control (ANC) system generates anti-noise with the same amplitude and opposite phase to reduce unwanted acoustic noise based on acoustic wave superposition. In general, ANC can generate a zone of quiet (ZoQ) around the error microphone position. However, if the microphone cannot be placed at the desired position, the reduction effect may not be sufficient in the desired position. In such a case, we need to use the virtual sensing method to achieve noise reduction at the desired position without placing the physically microphone. In virtual sensing method, secondary path variation can significantly degrade performance, and secondary path modeling errors can cause the system to diverge. In this presentation, we introduce a new online identification method for auxiliary filter-based virtual sensing in ANC system. Virtual sensing with online identification requires re-estimation of not only the secondary path but also the auxiliary filters. The proposed online identification method has the capability of online identification of auxiliary filters in addition to the conventional online identification of secondary paths. We show that through computer simulations the noise reduction can be maintained by applying the proposed online identification method even when the secondary path varies.
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