The feedforward structure is investigated and the simulating results show that this method controls the primary noise signal perfectly whether the secondary path is variable or not.

• 就前馈控制结构加以研究，仿真结果表明，该方法不仅在次路径固定不变时，使噪声信号得到明显衰减，并且在次路径发生改变时，依然能很好地控制噪声。