平面近场声全息信噪比估计方法研究

针对全息面复声压信噪比对声场重构结果影响较大、往往不能直接测量问题，采用二维小波分析方法进行全息面信噪比参数估计，分析小波函数、分解层级对信噪比估计准确性影响，明确二维小波分析的参数选取，并以受简谐激励作用的四周无限大障板简支钢板为对象进行辐射声场全息重构仿真分析。结果表明，信噪比参数对实现准确声场全息重构十分重要，用二维小波分析方法进行全息面信噪比参数估计有效且可行。

The estimation of the signal to noise ratio in the planar acoustical holography

The complex pressure signal to noise ratio on the acoustic holography surface has a great influence on the precision of the reconstruction results, however it cannot be measured directly. To solve this problem, the method of two-dimension wavelet analysis was proposed, and the effects of wavelet function and the decompose level were analyzed, which would make a decision for the parameters of the two-dimension wavelet analysis. The proposed method was validated by suing a synthetic sound field created by a point-drive, simply supported plated. The result showed that the two-dimension wavelet analysis for the complex pressure signal to noise ratio was feasible