响度三维空间分布重建

Reconstruction for 3D distribution of loudness in sound field

将近场声全息方法和声品质客观参量计算方法相结合,提出声品质客观参量-响度的三维空间分布重建方法,该方法通过建立从声压分布到响度分布的映射模型,计算声场中不同位置的声品质客观参量大小,得到响度的三维空间分布。为了验证方法的有效性,分别在单个点声源和两个点声源形成的声场开展响度三维分布重建模型的数值仿真分析研究,检验了重构距离、频率和双声源间夹角等参数对声压重构精度和响度三维分布重构精度的影响。同时,在全消声室内使用刚性表面球形传声器阵列对含两个扬声器辐射形成声场的进行了响度三维分布重构模型的实验验证。仿真和实验结果表明:该方法在近场声全息声场重建的基础上有效实现了响度三维空间分布的重建。

The loudness 3 D distribution reconstruction method was proposed by combining the nearfield acoustic holography method and the sound quality objective parameter-loudness calculation method. With this method,the mapping model from sound pressure to sound quality objective parameter-loudness was built to calculate sound quality objective parameter values at different positions in sound field. The 3 D distribution of loudness was reconstructed. Two kinds of sound field with one monopole sound source and two ones,respectively were used to conduct numerical simulation analyses for the loudness 3 D distribution reconstruction model. The effects of reconstruction distance,sound frequency,and intersection angle between two sound sources on the reconstruction accuracies of acoustic pressure and loudness 3 D distribution were examined. Finally,the rigid spherical microphone array was employed to experimentally verify the loudness 3 D distribution reconstruction model in a two-monopole sound field inside an anechoic room. The simulation and test results showed that the proposed method can effectively realize the reconstruction of loudness 3 D distribution based on reconstruction of nearfield acoustic holography sound field.