基于镜像源方法抑制混响干扰的声全息算法改进

针对实际厂房、机舱等封闭环境中,声全息成像受混响因素严重干扰的问题,在等效源近场声全息方法的基础上,采用房间脉冲响应代替自由空间格林函数建立传递函数,并利用压缩感知技术处理求解时的欠定问题,得到相对准确的等效源强度,以消除混响的干扰,提高声源定位的效果。通过初步的数值模拟,验证了方法的准确性和有效性。结果表明,与原算法相比,改进方法在混响环境中的声源定位具有明显的优势。

Improvement of Sound Holographic Algorithm Based on Image Source Method to Suppress Reverberation Interference

In the closed environment of workshop and engine room, the acoustic holographic imaging is seriously interfered by the reverberation factor. On the basis of the equivalent source near-field acoustic holography method, the room impulse response is used instead of the free space Green"s function to establish the transfer function, and the under-determination problem in the solution is processed by the compressed sensing technology to obtain the accurate equivalent source strength. Reverberation interference is suppressed and sound source localization effect is improved. The accuracy and effectiveness of the method are verified by preliminary numerical simulation. The results show that compared with the original algorithm, the improved method has obvious advantages in sound source localization in reverberantion environment.