Active sound and vibration control using adaptive digital signal processing

Active sound and vibration control is a rapidly emerging technology that has application to a wide variety of problems in manufacturing. These include reducing the exposure of workers to undesired noise and vibration, improving the quality of the product being produced, and allowing increased production rates for various processes and operations. Although the basic idea is quite old, the concept has not been practical until recently due to the development of powerful, low-cost digital signal processing systems. In addition, a variety of new adaptive filter techniques has broadened the range of applications. Adaptive digital signal processing enables the desired model to be determined in an online fashion using a system identification framework. The residual sound or vibration may be used as an error signal in an adaptive filter structure such as the least mean squares (LMS) algorithm to determine adaptively the correct model.<>