Abstract: The traditional passive noise control with the use of sound absorption or/and insulation is effective only for the noise control in the mid and high frequency range, while the active noise control based on sound cancellation by electro-acoustical means is effective in low frequency range (<500Hz). In this paper, a hybrid noise control method is presented taking advantages of both the passive and active control approaches. In this method, the active noise control based on multi-channel FXLMS algorithm is used to reduce the low frequency noise level, meanwhile, the mid to high frequency noise level is reduced by the passive noise control. Experimental results show that the frequency bandwidth of the noise which can be controlled is extended when the hybrid control is used, and this method is effective for the broadband noise control.

Key words: acoustics, active control, experiment, noise control

摘要： 传统的吸、隔声等被动噪声控制方法，适用于中、高频噪声的控制；主动噪声控制是利用声波的相消性干涉来达到降噪的目的，能够有效降低500 Hz以下的低频噪声。针对各自的不足，提出结合使用二者控制噪声的方法，在传统消声结构的基础上附加采用多通道FXLMS算法的主动消声系统。该装置充分发挥主、被动控制的长处，使用被动方法控制中、高频噪声，采用主动控制抵消低频声。实验结果表明主、被动噪声控制方法扩展降噪频带范围，改善降噪效果，是可行和有效的。

关键词: 声学, 主动控制, 实验, 噪声治理