调制声源的近场声全息分析

为了解决传统近场声全息技术在重建调制声源声场时无法显示出调制成分的问题,先通过Hilbert变换对调制信号的声场进行解调处理,将调制信号和载波信号分离开来,然后再对调制成分进行普通的重建分析,由此提出了基于Hilbert变换的调制声源近场声全息分析方法。文中的数值仿真与试验研究均表明此方法可以有效地完成调制声源的重建分析。

Near-field acoustic holography analysis of modulated sound source

When conventional near-field acoustic holography(NAH)technique is applied to sound field induced by modulated signal,the modulating frequency can not be revealed by the reconstructed results.To solve the problem, an NAH analysis procedure for modulated sound source was proposed.Firstly,Hilbert transform was introduced to demodulate the signal,and then modulating component was reconstructed by NAH technique.Both numerical simulation and experiment results demonstrate that accurate reconstruction analysis could be obtained by the proposed method.