Active noise control system without secondary path model

The proposed system is based on the simultaneous perturbation optimization method with block process. Consequently, the coefficients of the adaptive filter in the proposed system are updated by only error signals. The conventional ANC system using the filtered-x algorithm becomes unstable due to the error between the secondary path and its model. On the other hand, the proposed ANC system has an advantageous property in not using the model. In this paper, we show the principle of the proposed ANC system and examine the efficiency of computer simulations