一种有效抑制阵列后方声源的心形指向性传声器阵列

基于心形指向性传声器的波束形成可以有效抑制阵列后方声源的干扰,提高前方声源的识别精度。以平面轮形传声器阵列为对象,借助MATLAB仿真计算,对阵列后方声源波束形成声源识别特性及其抑制方法进行研究。基于除自谱的互谱波束形成算法提出了含有传声器指向性的波束形成算法,对圆形和心形指向性传声器进行不同声源类型的波束形成仿真计算,并针对仿真结果显示出的不足,给出了既能保证阵列平面上最大声压贡献量的识别精度,又能降低旁瓣水平的幅值校正算法。试验结果证明了基于心形指向性传声器的波束形成可以有效抑制后方声源。

A heart-shaped directional microphone array for suppressing noise behind array

Based on heart-shaped directional microphone, the beamforming method can suppress the noise behind arrays and make the precision of sound source identification much better. A planar wheel microphone array is taken as research target, and the beamforming performance for noise behind microphone array and the noise suppression methods are analyzed with MATLAB simulation. Based on the auto-spectrum removal algorithm, the algorithm containing microphone directivity is proposed. The beamforming based on round and heart-shaped directional microphones for different types of sound sources are simulated. To solve the deficiency, the amplitude correction algorithm of the maximum point, which not only ensures the accuracy of maximum sound pressure contribution on the array plane, but also reduces the side lobe level, is proposed. Finally, the experiment indicates that the heart-shaped directional microphone array can suppress the noise behind arrays.