基于平面声全息的全空间场变换:Ⅰ.原理与算法

Full spatial transformation of sound field based on planar acoustic holography: I. Principle and algorithm

首先证明了NAH变换中两种Green函数变换关系式对最终的场变换结果的一致性,给出了NAH变换中主要参数之间的定量关系式,进行了滤波窗的性能优化分析。利用 NAH变换与Helmholtz积分,提出了改进的远场指向性快速计算方法,与DRL方法相比,该方法对声源形状的适应性更强,计算精度更高。

It is demonstrated that the two forms of Green function in NAH technique give the same final results of sound field transformation. The quantitative relationships between the main parameters in NAH technique are deduced. The performance analysis of various filters is conducted. The methods for quickly calculating of the far-field directionality are given by use of the NAH field transformation and Helmholtz integration. Compared with DRL method, it is more applicable and precise for various acoustics sources.