The near-field acoustic holography experimental research based on the second-order cyclic statistics
Chen Zhi-min1; Zhu Hai-chao1; Kuang Gong-xian2
1.Institute of Noise and Vibration, Naval University of Engineering, Wuhan 430033;2.the Meteorological and Hydrographic Bureau, General staff ,Beijing 100081
Abstract：The conventional near-field acoustic holography technology can not mirror exactly modulation characteristics of cyclostationary sound field through the reconstructed results. So the demodulation ability of the cyclic autocorrelation function was used to extract the feature cyclic frequency, the cyclic spectrum density (CSD) was obtained through the cyclic Wiener-Khinchin relation, and the CSD was adopted as reconstructed physical quantity in planar near-field acoustic holography instead of the spectrum of pressure. The experiment research show that the feature frequence of cyclostationary sound field can be extracted exactly and its essential characteristics can be observed directly from the reconstructed results.
2011, Vol. 30 
