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麦克风阵列的几何结构形成了麦克风阵列工作时性能的基本限制,是影响噪声源识别系统性能的关键因素之一.对十字阵(37阵元)、六角阵(37阵元)、矩形阵(36阵元)在均匀加权时方向性、角度分辨率等性能进行仿真定量对比研究:十字阵具有最好的方向性为71.6 dB,六角阵具有最好的空间对称性且能抑制栅瓣;阵元数目变化时主瓣宽度的对比,表明阵元数大于100时增加阵元对改善角度分辨率作用不大;主瓣宽度与频率关系,显示随频率增加3种阵列输出信号畸变程度基本相同.
The geometric structure of the microphone array forms a basic limitation of the performance of the microphone array and is one of the key factors that affect the performance of the noise source identification system.For the cross array (37 elements), the hexagonal array (37 elements), the rectangular array (36) Array elements) in the uniform weighted directionality, angular resolution and other performance simulation quantitative research: cross array has the best direction of 71.6 dB, hexagonal array has the best space symmetry and can inhibit the grating lobe; array element The comparison of the main lobe width with the change of the number indicates that the increase of the array element does not play an important role in improving the angular resolution when the number of elements is greater than 100. The relation between the width of the main lobe and the frequency shows that the output distortion of the three arrays is basically the same as the frequency increases.