Map estimation of driving signals of loudspeakers for sound field reproduction from pressure measurements
Map estimation of driving signals of loudspeakers for sound field reproduction from pressure measurements
复制标题
通过压力测量对扬声器驱动信号进行声场再现的地图估计
DOI：
10.1109/waspaa.2013.6701895
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发表时间：
2013
期刊：
影响因子：
--
通讯作者：
Y. Haneda
中科院分区：
文献类型：
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作者：
Shoichi Koyama;K. Furuya;Y. Hiwasaki;Y. Haneda
声场再现方法计算扬声器的驱动信号以再现期望的声场。在普通的录音和再现系统中，在录音室中获得的多个位置处的声压仅被称为期望声场;因此，需要从声压到驱动信号的信号变换算法（SP-DS转换）。尽管已经提出了几种SP-DS转换方法，但是它们没有考虑关于记录的声场的先验信息。然而，可以通过使用麦克风的接收信号或其他传感器数据来获得声源的近似位置。当麦克风和扬声器的阵列配置为平面或线性时，我们提出了一种基于最大后验概率（MAP）估计的SP-DS转换方法。基于声源位置的先验信息，优化了用于表示扬声器驱动信号的最优基函数及其系数。数值仿真结果表明，与现有的SP-DS转换方法相比，该方法能够获得更高的再现精度，尤其是在空间奈奎斯特频率以上的高频下。
Sound field reproduction methods calculate driving signals of loudspeakers to reproduce the desired sound field. In common recording and reproduction systems, sound pressures at multiple positions obtained in a recording room are only known as the desired sound field; therefore, signal transformation algorithms from sound pressures into driving signals (SP-DS conversion) are necessary. Although several SP-DS conversion methods have been proposed, they do not take into account a priori information about the recorded sound field. However, approximate positions of sound sources can be obtained by using the received signals of microphones or other sensor data. We propose an SP-DS conversion method based on the maximum a posteriori (MAP) estimation when array configurations of the microphones and loudspeakers are planar or linear. The optimal basis functions and their coefficients for representing driving signals of the loudspeakers are optimized based on the prior information of the source positions. Numerical simulation results indicate that the proposed method can achieve higher reproduction accuracy compared to the current SP-DS conversion methods, especially in higher frequencies above the spatial Nyquist frequency.