Adaptive Active Feedback Noise Control System

Active Noise Control (ANC) is a relative new technique in the field of noise control and has been developed rapidly in recent years. With the development of ANC in three dimension spaces, adaptive filter technique has been used in ANC and formed Adaptive Active Noise Control (AANC) . To solve the problems of that real AANC systems can't get the good reference signals in some situation and the acoustic feedback problems. In this M.S. thesis, adaptive feedback is explored theatrically and experimentally.The main contact is about the implement of the feedback AANC system using Internal Model Control (IMC) configuration. Firstly, the performance of common filter-X LMS algorithm is examined. Then, the algorithm of feedback AANC systems based on Filtering-X LMS algorithm is deduced. Based on theoretic analysis and computer simulations, the performance of single-path and multi-channel AANC systems is studied.Finally, the implementing the feedback AANC systems based on IMC configurations is investigated. The conclusion obtained would give an help for application of the AANC technique to engineering.