ACTIVE NOISE-CONTROL TECHNOLOGY

This paper presents the new signal processing algorithm for active noise control(ANC)system. The first algorithm improves stability of ANC system in practical use. The second algorithm uses the infinite impulse response adaptive digital filter(IIR-ADF)for ANC system. The amount of calculation can be reduced, compared with the finite impulse response adaptive digital filter(FIR-ADF). Furthermore, AR lattice filter is used for IIR filtering to keep stability of the filter during adaptation. The third algorithm is possible to reduce the amount of calculation in multichannel ANC.