Active control of noise in enclosed spaces

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Abstract
Active methods for controlling noise have been demonstrated to be feasible. As they are compact in volume and low in weight, active controls seem very promsing for controlling low-frequency noise in enclosed spaces, particularly in transportation vehicles. Nevertheless, certain difficulties arise due to the modal structure developed within the enclosed spaces, because the cancellation sources must produce an exact match of the unwanted noise field in order to cancel it. Similarly, the nonuniform nature of the noise field poses problems in detection of the noise. This paper discusses the progress which has already been made in controlling interior noise and shows that there are several approaches that may be adopted. The methods depend on whether the noise originates within the space or from sources outside the space. If the sound enters the space by penetration from the outside, then the method of penetration can be important in determining the location of the cancelling sources and the detecting microphones. The technical potential and the latitude of application indicate that there is considerable promise for active control of noise in enclosed spaces.

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