Multi-channel active noise control system using the perturbation method with correlation removal filter

In this paper, we verify practical effectiveness of ANC systems using the perturbation method with a correlation removal filter. Many microphones are generally needed to pick up all noise signals where some noise signals are simultaneously controlled in more spacious space. Therefore, the noise signals give correlations between reference signals and then the convergence speed of noise control filters becomes slow. The proposed system can remove the correlations by inserting a correlation removal filter between reference signals and consequently reduce the noise more quickly. Moreover, we use the frequency domain time difference simultaneous perturbation method (FDTDSP method) to update the noise control filters. Experimental results demonstrate that the ANC system using the perturbation method with a correlation removal filter is effective in the actual system.