一种低频扬声器辐射声场测量技术  

A Low Frequency Loudspeaker Radiated Sound Field Measurement Technology

作　　者：张鹏[1] 匡正[1] 吴鸣[1] 杨军[1] 

机构地区：[1]中国科学院声学研究所噪声与振动重点实验室,北京100190

出　　处：《电声技术》2015年第3期54-59,共6页Audio Engineering

摘　　要：低频扬声器的辐射声场由于消声室低频截止频率的影响,不易使用标准的声场测量方法进行准确的测量。利用近场声全息技术以及球面坐标系下的声场分离原理,在球谐函数展开表达式中,导出广义的球谐函数系数求解方程,并采用最小二乘法进行球谐函数展开式中系数的估计,使用推导出的声场分离方法利用非自由空间非球面测量,最终重建出声源在自由空间的辐射声场。为了验证所提方法的有效性,使用偶极子声源以及由数个单极子组成的复杂声源进行了多种情况下的仿真,仿真结果验证了所述方法的有效性。Due to the radiation cutoff frequency of anechoic chamber, it is difficult to use the standard measurement meth- ods to performing subwoofer measurements. This paper uses near - field acoustic holography and the sound field separation principle based on spherical coordinate system under the spherical harmonic expansion expression, to achieve generalized spherical harmonic coefficients of equations, and uses the least squares method in the spherical harmonic expansion coeffi- cients to estimate these coefficients. This paper uses the sound field separation method and non - free - space aspheric meas- urement, and ultimately rebuilds the radiated sound field of the sound source in free space . In order to verify the effective- ness of the proposed method, a dipole sound source and a complexity sound source composed by a number of monopoles are simulated to demonstrate the effectiveness of this methad.

关 键 词：近场声全息技术 球谐函数 声场分离方法 声源 

分 类 号：O422.2[理学—声学]