抄録
This paper proposes an active noise controller with Filtered-X Fast Transversal Filter (FXFTF) algorithm and Frequency Domain Adaptive (FDA) Algorithm in 3-Dimentional acoustic field which outside noise makes. Generally, in active noise control, Filtered-X LMS (FXLMS) algorithm is applied because of its simplicity and stability. However, FXLMS algorithm has a fault that the convergence speed is slow. On the other hand, some adaptive algorithms based on least squares method are known with faster convergence speed than LMS type algorithm although the calculated amount is large. If an algorithm based on least squares method is able to be applied to active noise control system, it is prospective that the field of active noise control is spread. From this point of view this paper picks up FXFTF algorithm and FDA algorithm based on least squares method. By means of Computer simulation and experimental analysis the performance of FXFTF algorithm and FDA algorithm is compared to that of FXLMS algorithm. With the result of the comparison it is shown that FXFTF algorithm and FDA algorithm have faster convergence speed than FXLMS algorithm in several acoustic field.
