Sound-space recording and binaural presentation system based on a 252-channel microphone array
Sound-space recording and binaural presentation system based on a 252-channel microphone array
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基于252通道麦克风阵列的声空间录音及双耳呈现系统
DOI：
10.1250/ast.36.516
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发表时间：
2015
影响因子：
0.7
通讯作者：
Yôiti Suzuki
中科院分区：
文献类型：
--
作者：
S. Sakamoto;S. Hongo;T. Okamoto;Y. Iwaya;Yôiti Suzuki
高清晰度三维（3D）声音空间信息的传感对于实现全三维空间声音技术至关重要。我们提出了一种使用对称和密集排列的麦克风的三维声音空间信息的传感方法。这种方法被称为SENZI（对称对象与镶嵌的Zillion麦克风）。在SENZI方法中，麦克风记录的信号被简单地加权和求和，以合成收听者的头部相关传递函数（HRTF），即使在记录之后也反映收听者所面对的方向。SENZI方法正在开发为使用球形麦克风阵列和现场可编程门阵列（FPGA）的实时系统。在SENZI系统中，252个电电容麦克风（ECM）几乎均匀地分布在一个刚性球体上。利用刚性球的传递函数对传声器频率响应的偏差进行了补偿。为了避免麦克风内部噪声对合成声音空间信息精度的影响，特别是在低频区域，通过控制传递函数矩阵的条件数，分析了麦克风信噪比对合成声音空间信息精度的影响。在这些分析结果的基础上，实现了紧凑的SENZI系统。实验结果表明，该系统能很好地表达三维声空间信息。
Sensing of high-definition three-dimensional (3D) sound-space information is of crucial importance for realizing total 3D spatial sound technology. We have proposed a sensing method for 3D sound-space information using symmetrically and densely arranged microphones. This method is called SENZI (Symmetrical object with ENchased Zillion microphones). In the SENZI method, signals recorded by the microphones are simply weighted and summed to synthesize a listener’s headrelated transfer functions (HRTFs), reflecting the direction in which the listener is facing even after recording. The SENZI method is being developed as a real-time system using a spherical microphone array and field-programmable gate arrays (FPGAs). In the SENZI system, 252 electric condenser microphones (ECMs) were almost uniformly distributed on a rigid sphere. The deviations of the microphone frequency responses were compensated for using the transfer function of the rigid sphere. To avoid the degradation of the accuracy of the synthesized sound space by microphone internal noise, particularly in the low-frequency region, we analyzed the effect of the signal-to-noise ratio (SNR) of microphones on the accuracy of synthesized sound-space information by controlling condition numbers of matrix constructed from transfer functions. On the basis of the results of these analyses, a compact SENZI system was implemented. Results of experiments indicated that 3D sound-space information was well expressed using the system.