Effectiveness of headrest ANC system with virtual sensing technique for factory noise

In this paper, we examine the effectiveness of headrest active noise control (ANC) system with the virtual sensing technique for factory noise. In recent years, the development of various industrial devices has caused acoustic noise problems related to factory machines. Although the noise canceling headphones and earphones can reduce factory noise, but they prevent verbal communications and give uncomfortable feeling, so headrest ANC systems becomes one of candidates for this kind of situations. However, the headrest ANC system has a problem that the zone of quiet (ZoQ) cannot be formed around desired locations (e. g. ears) because the ZoQ is generally formed around error microphones located into the headrest which are far from the desired locations. Therefore, we have developed a headrest ANC system with virtual sensing technique. In this paper, we investigate the effectiveness of the proposed headrest ANC system through real world experiments. As a result, it is found that the proposed headrest ANC system can reduce unwanted factory noise more than 30 dB at the desired locations compared with the conventional system (without virtual sensing technique).

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