散射条件下小尺度扬声器阵列声聚焦算法鲁棒性研究

发布时间：2018-06-17 23:14

本文选题：扬声器阵列 + 声聚焦　；参考：《南京大学学报(自然科学)》2016年02期

【摘要】：随着便携通讯设备的快速发展,其音频系统的声聚焦特性逐渐受到了广泛的关注.受到尺寸的限制,便携通讯设备上的声场回放只能采用小尺度扬声器阵列来实现.声对比度控制法通过最大化亮区与暗区的声能量比值将声能量集中在亮区,这种算法在小尺度扬声器阵列声聚焦的实现上有着较好的应用前景.建立了5通道线性扬声器阵列模型,采用鲁棒型声对比度控制法将声能量聚焦于阵列端射方向的亮区.考虑到使用者对阵列不可避免的散射作用,重点分析了听音者散射对阵列声聚焦性能的影响,散射分析建立在一个刚性球散射模型和双刚性球散射模型(亮区和暗区同时存在听音者)的基础上.进一步采用人工头和刚性球建立了实验系统,通过实验验证了算法对于一个听音者和两个听音者散射的鲁棒性.
[Abstract]:With the rapid development of portable communication equipment, the sound focusing characteristics of audio system have been paid more and more attention. Due to the limitation of size, the playback of sound field on portable communication equipment can only be achieved by using a small scale loudspeaker array. The acoustic contrast control method concentrates the acoustic energy in the bright region by maximizing the ratio of the acoustic energy in the bright area to the dark area. This algorithm has a good application prospect in the realization of the acoustic focusing of the small scale loudspeaker array. A 5-channel linear loudspeaker array model is established, and the robust acoustic contrast control method is used to focus the acoustic energy on the bright region of the end emission direction of the array. Considering the inevitable scattering effect of the user on the array, the emphasis is placed on the analysis of the effect of the listener scattering on the sound focusing performance of the array, The scattering analysis is based on a rigid sphere scattering model and a double rigid sphere scattering model. Furthermore, the experimental system is established by using artificial head and rigid ball. The robustness of the algorithm to the scattering of one listener and two listeners is verified by experiments.
【作者单位】：近代声学教育部重点实验室南京大学声学所;
【基金】：国家自然科学基金(11374156,11204130)
【分类号】：TN643

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