一种有源头靠系统中虚拟传声器技术的改进方法

对人头移动导致有源头靠降噪效果下降的问题进行了理论分析,得到了残余噪声的预测表达式,提出了一种通过设计次级通道模型改进虚拟传声器技术性能的方法。分析表明,人耳位置处降噪量取决于虚拟传声器方法中采用的次级通道模型与人头移动到不同位置处的真实次级通道之间的匹配程度。通过设计合理的次级通道模型,可有效扩大人耳获得有效降噪量的人头允许移动范围。仿真分析和实验结果验证了该方法的有效性。

An improvement on the virtual microphone techniques applied in active headrest

In this paper, a novel method is proposed to improve the performance of the virtual microphone techniques applied in the active noise-reducing headrest. The performance degradations of the active headrest caused by head movements are analyzed, and a theoretical model to predict the residual noise is developed. It is found that the mismatches between the path models and the virtual paths determine the levels of the noise reductions achieved at the ears in the active headrests with virtual microphone techniques. The range of the head movements, within which effective noise reductions can be achieved at the ears, could be enlarged by designing appropriate models for the secondary paths. Simulations and experiments confirm the validity of the proposed method.