A new hybrid active noise control system in the presence of wideband and narrowband noise components

The conventional broadband active noise control (ANC) system may perform very poorly if its primary and reference noise signals contain both wideband and narrowband components simultaneously. In this paper, we propose a new feedforward hybrid ANC system capable of reducing noise signals with both wideband and narrowband components. First, some basic analysis is provided to show why the conventional broadband ANC system may indicate poor performance in the presence of both wideband and narrowband components. Next, a new hybrid ANC system is proposed to tackle this problem. The new system consists of three subsystems, i.e., a sinusoidal noise canceller using IIR notch filters, a broadband and a narrowband ANC subsystem, which work in harmony. Extensive simulations are conducted to confirm the effectiveness of the proposed system.