头戴式有源噪声控制系统的分区域优化方法研究

Region Division-based Optimization Method for Head-mounted Active Noise Control System

本文提出了一种适用于头戴式有源噪声控制系统的有源降噪方法,结合虚拟传声器技术,并通过将水平面划分为多个子区域,实现人耳处对不同方向噪声的有效控制。初级声场传递函数的实际值与其估计值的偏差是影响头戴式有源噪声控制系统降噪量的主要因素,因此需要优化一定角度范围内的初级声场传递函数。本文提出一种基于最大化该区域最小降噪量的优化设计方法,将水平面划分为不同子区域,每个子区域分别使用对应的优化初级声场传递函数进行噪声控制。该方法减小了区域内初级声场传递函数的变化范围,有效提高了区域内的最小降噪量。实验结果验证了该噪声控制方法的有效性。

An optimization method for the head-mounted active noise control system is proposed in this paper.By combining the virtual microphone technique and dividing the horizontal plane into several sub-regions,an effective noise reduction at human ear can be achieved.Because the main factor affecting noise reduction is the deviation between the actual primary acoustic transfer function and the estimated primary acoustic transfer function,an optimization method for designing the primary acoustic transfer function in a certain region is proposed by maximizing the minimum noise reduction in this region.Accordingly,the horizontal plane is divided into several sub-regions,the optimized primary acoustic transfer function is used for noise control in each sub-region.The proposed method can reduce the variation of the primary acoustic transfer function in a certain region,and thus can increase the minimum noise reduction in this region effectively.Experimental results show the validity of the proposed method for head-mounted active noise control system.