Institute of Sound and Vibration Research, University of Southampton, Southampton, SO17 1BJ, United Kingdom.
J Acoust Soc Am. 2018 May;143(5):2858. doi: 10.1121/1.5037363.
The remote microphone technique is considered in this paper as a way of estimating the error signals at a listener's ears in an active headrest system using remotely installed monitoring microphones. A least-squares formulation for the optimal observation filter is presented, including a regularization factor that is chosen to satisfy both the estimation accuracy and robustness to uncertainties. The accuracy of the nearfield estimation is first investigated for a diffuse field via simulations. Additionally, simulations of a free field are also used to investigate the effect of the spatial directivity of the primary field. Finally, experiments in an anechoic chamber are conducted with 24 monitoring microphones around a dummy head positioned in an active headrest system. When six loudspeakers driven by uncorrelated random disturbances are used to generate the primary field, the best arrangement of monitoring microphones is considered, taking into account both accuracy and robustness.
本文考虑使用远程安装的监测麦克风，通过主动头枕系统中的远程麦克风技术来估计听众耳朵处的误差信号。提出了一种基于最小二乘法的最优观测滤波器的公式，其中包括一个正则化因子，该因子是为了同时满足估计精度和对不确定性的鲁棒性而选择的。首先通过模拟对漫射场的近场估计精度进行了研究。此外，还使用自由场的模拟来研究主要场的空间指向性的影响。最后，在消声室中进行了实验，在主动头枕系统中使用一个位于假人头周围的 24 个监测麦克风。当使用由不相关的随机干扰驱动的六个扬声器来产生主声场时，考虑到准确性和鲁棒性，考虑了监测麦克风的最佳布置。
