使用传声器阵列的涡旋声束旋转多普勒分析及其解复用  

Rotational Doppler analysis and demultiplexing of acoustic vortices using a microphone array

作　　者：刘联鋆 褚志刚[1] LIU Lianyun;CHU Zhigang(College of Mechanical and Vehicle Engineering,Chongqing University,Chongqing 400044)

机构地区：[1]重庆大学机械与运载工程学院,重庆400044

出　　处：《声学学报》2025年第2期332-337,共6页Acta Acustica

摘　　要：针对现有单旋转传声器解复用方法存在的低频响应不足和串扰问题,提出了基于圆形传声器阵列的涡旋声束旋转多普勒分析和解复用方法。采用圆形传声器阵列提取旋转观察者接收的声压时域信号,并获得该声信号的旋转多普勒频移特性,然后分别根据某转速下单频谱和一定转速范围内多频谱的特性实现对涡旋声束的解复用。结果表明,单频谱解复用方法存在由极限多普勒效应和频移相同导致的解复用失效问题,而基于多频谱平均值的涡旋声束解复用方法可有效地解决低频响应不足和串扰等问题。In order to solve the problems of both insufficient response at low frequencies and crosstalk suffered by the existing acoustic vortex demultiplexing method using a single rotating microphone,a method using a circular array of microphones is proposed to analyze the rotational Doppler effect and then demultiplex the acoustic vortex.The circular microphone array is used to extract the time-domain sound pressure signals received by a rotating observer,and the rotational Doppler shifts of the extracted signals are obtained.The acoustic vortex is then demultiplexed from the single spectrum at a certain speed and the multiple spectra within a certain speed range,respectively.The results show that the demultiplexing method using the single-spectrum suffers from the failures caused by the extreme Doppler effect and the equal Doppler shift,while the demultiplexing method using the multiple spectra has effectively solved the problems of insufficient response at low frequencies and crosstalk.

关 键 词：涡旋声束 旋转多普勒效应 传声器阵列 解复用 

分 类 号：TN641[电子电信—电路与系统]