基于小型阵列探头的声波分离方法研究.pdfVIP

电声技术 AUDIO ENGINEERING 基于小型阵列探头的声波分离方法研究 1 2 1 1 1 岳磊 金江明 宋玉来 卢奂采 姜伟 （1 浙江工业大学机械工程学院，特种装备制造与先进加工技术教育部/浙江省重点实验室，杭州 310014；2 浙江省信号处理重点 实验室，杭州 310014） 摘 要：声级计等现有的声压在线测量工具并不能够抑制干扰噪声对测量精度的影响，本文针对这一问题提出了一种基于小型阵列 探头的声波分离方法，该方法以球波函数叠加逼近理论作为分离算法的基础，可应用于噪声环境下目标对象辐射声压的简易快速 准确测量。为验证该方法的可行性，本文设计了一个由5个麦克风组成的小型立体阵列探头，在含有干扰声源的声场中，通过对探 头所测得的复声压信号进行声波分离算法处理，便可将测量对象辐射的声波从存在干扰声波的声场中分离开来。数值仿真及实验 结果表明，通过该方法可以简易快速的得到较好的声波分离效果。 关键词：小型阵列探头；球波函数叠加；声波分离；声压测量 中图分类号：TB52+2 文献标识码：A Study on acoustic wave separation technique based on mini-sized array probe Lei Yue1 Jiangming Jin2 Yulai Song1 Huancai Lu1 Jiang Wei1 (1 Key Laboratory of EM, Ministry of Education Zhejiang Province, Zhejiang University of Technology, Hangzhou 310014; 2 Key Laboratory of Signal Processing of Zhejiang Province, Hangzhou 310014) Abstract ：The existing on-line instruments for acoustic pressure measurement such as sound level meter, can’t ensure measurement accuracy because of the impact of interference noise. In order to solve this problem, an acoustic wave separation technique based on mini-sized array probe was proposed. The technique utilized the spherical wave superposition and approximation theory as the basis of separation algorithm and it can be applied to simple, fast and accurate measurement of acoustic pressure radiated from target in noise environment. To verify the feasibility of the technique, a mini-sized array probe consists of five microphones was designed and it can be used to separate the acoustic wave generated by target source from the sound field contained interference noise through processing complex pressure signal measured by array p