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The applicability of Active Noise Control (ANC) systems to minimise low frequency noise in enclosures has been a key area of interest in recent years and is now reasonably well understood. Local control at one or more points within an enclosure, such as a mining vehicle cabin, has successfully been achieved through the use of loudspeakers as control sources. However, typical ANC systems struggle to adapt quickly and smoothly as the required location of control is moved. Additionally, the control sources tend to be omnidirectional, resulting in locations away from the zone of interest being adversely affected by the presence of the control source. Therefore, any additional people in the enclosure, but not within the zone of control, may actually experience even higher levels of discomfort than they would without a control system in place. This project intends to ameliorate these problems through beam-forming using an array of conventional loudspeakers.
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