【作者】 周浩然； 卢晶；

【Author】 ZHOU Hao-ran;LU Jing;Key Lab of Modern Acoustics(MOE), Institute of Acoustics, Nanjing University;

【机构】 近代声学教育部重点实验室南京大学声学研究所；

【摘要】 环形传声器阵列能够实现平面内全方向的空间滤波,因而具有运用于高品质音频录制系统的潜力。安装在散射体上的环形阵列由于存在声波散射,在声场中引入了更丰富的空间信息,其鲁棒性比空心阵列具有天然的优势,但是其较大的体积限制了其应用的前景。而空心环形传声器阵列则因为结构的限制,在高频端会存在很多与贝塞尔函数零点对应的相位模式零点,给鲁棒型的环谐函数波束设计带来困难。本文通过对空心阵列三维指向性的分析,提出改进的算法克服高频限制,使得阵列的可用频带获得扩展。更多还原

【Abstract】 Circular microphone arrays enable spatial filtering within the horizontal plane, so they are attractive as a solution to high-quality audio recording. Baffuled circular microphone arrays have an advantage over unbaffuled circular microphone arrays in robustness because scattering makes the sound field more complicated, but their sizes are usually too big for practical use. Unbuffled circular microphone arrays cannot extract the proportions of phase-modes robustly at certain frequency, making it hard to design a practical beamforming solution. This article proposes an improved circular harmonic beamforming method to expand the useable band based on our analysis of the white noise gain and three-dimensional directivity. A simulation is also conducted to verify our method is viable.更多还原