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.