Petersen Cornelis D, Zander Anthony C, Cazzolato Ben S, Hansen Colin H
Active Noise and Vibration Control Group, School of Mechanical Engineering, The University of Adelaide, SA 5005, Australia.
J Acoust Soc Am. 2007 Mar;121(3):1459-70. doi: 10.1121/1.2431583.
A frequent problem in active noise control is that the zone of quiet created at the error sensor tends to be very small. This means that the error sensor generally needs to be located close to an observer's ear, which might not always be a convenient or feasible solution. Virtual sensing is a method that can move the zone of quiet away from the error sensor to a desired location that is spatially fixed. This method has been investigated previously, and has shown potential to improve the performance of an active noise control system. However, it is very likely that the desired location of the zone of quiet is not spatially fixed. An active noise control system incorporating a virtual sensing method thus has to be able to create a moving zone of quiet that tracks the observer's ears. This paper presents a method for creating a moving zone of quiet based on the LMS virtual microphone technique. To illustrate the proposed method, it is implemented in an acoustic duct and narrowband control results are presented. These results show that a moving zone of quiet was effectively created inside the duct for narrowband noise.
有源噪声控制中一个常见的问题是，在误差传感器处产生的安静区域往往非常小。这意味着误差传感器通常需要放置在靠近观察者耳朵的位置，而这可能并不总是一个方便或可行的解决方案。虚拟传感是一种可以将安静区域从误差传感器移到空间固定的期望位置的方法。该方法此前已被研究，并显示出改善有源噪声控制系统性能的潜力。然而，安静区域的期望位置很可能不是空间固定的。因此，采用虚拟传感方法的有源噪声控制系统必须能够创建一个跟踪观察者耳朵的移动安静区域。本文提出了一种基于最小均方虚拟传声器技术创建移动安静区域的方法。为说明所提出的方法，在声学管道中实现了该方法，并给出了窄带控制结果。这些结果表明，对于窄带噪声，在管道内有效地创建了一个移动安静区域。
