A broadband feedforward active noise control system utilizing maximally decimated alias-free DFT-FSF banks

This paper proposes a frequency domain estimation algorithm for feedforward active noise control systems. To configure an M-tap adaptive filter, this technique uses M-channel maximally decimated alias-free DFT-frequency sampling filter (DFTFSF) banks which equipped with 1-tap adaptive filter in each subband. The use of the proposed frequency domain estimation algorithm enables more than 10 times faster convergence than the normalized least mean square algorithm, and at the same time, the delayless structure enables broadband noise attenuation. Computer simulation results using the measured impulse response of an actual experimental setup show the effectiveness of the proposed method.