A compact microphone array system for outdoor low frequency noise measurements

为了调查风电场噪声对周围社区的影响，必须准确测量风电机组产生的声级，但由于风激噪声和其他干扰噪声的存在，有时很难测量。本项目旨在提出一种新颖的紧凑型麦克风阵列解决方案，首先通过特殊设计的防风外壳衰减风致噪声，然后通过基于球形和差分麦克风阵列结构的特定自适应噪声消除算法进一步滤除剩余的风致噪声和其他干扰噪声。有了拟议的系统，预计测量配置尺寸将从目前的几米减少到10厘米以下，并具有更高的准确性。

To investigate the impact of wind farm noise on surrounding communities, the sound level caused by wind turbines must be accurately measured, which sometimes is hard due to wind induced noise and other interference noise. This project aims to propose a novel compact microphone array solution, where the wind induced noise is attenuated by a specially designed windproof shell first, and then the residual wind induced noise and other interference noise are further filtered out by a specific adaptive noise cancellation algorithm based on the spherical and differential microphone array structure. With the proposed system, the measurement configuration size is expected to be reduced from the current few metres to less than 10 centimetres, and with better accuracy.