Enhancement of Spatial Sound Recordings by Adding Virtual Microphones to Spherical Microphone Arrays
Enhancement of Spatial Sound Recordings by Adding Virtual Microphones to Spherical Microphone Arrays
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发表时间：
2017
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通讯作者：
César D. Salvador;S. Sakamoto;J. Treviño;Yôiti Suzuki
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作者：
César D. Salvador;S. Sakamoto;J. Treviño;Yôiti Suzuki
.安装在刚性球形基底上的球形麦克风阵列通过在所有方向上感测空间来有效地捕获声学环境以用于其重建。使用球面傅里叶变换对阵列信号进行进一步编码以用于其可缩放处理。最近的空间声音应用要求具有大量麦克风的阵列。然而，物理上增加可用阵列的空间分辨率并不总是可行的。在会议室或音乐霍尔斯等环境中，源位置通常被限制在一个小的空间区域内。当假定有关源位置的先验知识时，可以用刚性球的物理模型来估计在基底上的任何点处产生的压力。本文利用刚性球模型定义了一个表面压力变化函数，它将基底上任意两点的压力联系起来。基于该函数，提出了一种球阵空间分辨率增强方法，该方法通过在无传声器位置合成记录信号，在球阵中加入虚拟传声器。该建议构成了一个预处理阶段，旨在应用于阵列信号编码之前。数值实验表明，当真实的传声器数目足够大时，空间分辨率的提高是可能的。
. Spherical microphone arrays mounted on a rigid spherical baffle effectively capture acoustic environments for their reconstruction by sensing the space in all directions. The array signals are further encoded for their scalable processing using the spherical Fourier transform. Recent spatial sound applications are demanding arrays with a large number of microphones. However, physically increasing the spatial resolution of available arrays is not always feasible. In environments such as conference rooms or concert halls the source positions are often confined to a small region of space. When prior knowledge about source positions is assumed, the pressure generated at any point on the baffle can be estimated with a physical model of the rigid sphere. In this paper, the rigid sphere model is used to define a surface pressure variation function that relates the pressure at two arbitrary points on the baffle. Based on this function, a spatial resolution enhancement method for spherical arrays is proposed, which aims to add virtual microphones to the array by synthesizing recording of signals at positions without micro-phones. The proposal constitutes a preprocessing stage intended to be applied before array signal encoding. Numerical experiments show that the enhancement of spatial resolution is possible all over the sphere if the number of real microphones is sufficiently large.