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Active noise control without a secondary path model by using a frequency-domain simultaneous perturbation method with variable perturbation

We propose a frequency-domain active noise control (ANC) system without a secondary path model. The proposed system is based on the frequency-domain simultaneous perturbation (FDSP) method with variable perturbation. In this system, the coefficients of the adaptive filter are updated only by error signals. The conventional ANC system using the filtered-x algorithm becomes unstable due to the error between the secondary path, from secondary source to error sensor, and its model. In contrast, the proposed ANC system has the advantage of not using the model. Furthermore, the variable perturbation brings fast convergence. Simulation results demonstrate the efficiency of the proposed ANC system compared with the conventional ANC systems.