抄録
In this paper, an active noise barrier (ANB) using active noise control technique to improve the performance of passive noise barrier is proposed. The ANB consists of several feedback control units and a feedforward control unit. The feedback controller provides active noise insulation, and the feedforward controller whose reference signal is synthesized in the feedback controller cancels noise at its error microphone. A preliminary identification step is required in which the effective characteristic of controller to minimize noise at control point is modeled as a FIR filter. Once the preliminary identification step is completed, the error microphone for feedforward control is removed during control. As a result of computer simulation, the ANB is more effective for noise insulation than use of feedback control units or single feedforward control unit in low frequency.
