南京大学学报(自然科学版) ›› 2016, Vol. 52 ›› Issue (2): 382.
涂 臻*,卢 晶
Tu Zhen*,Lu Jing
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.
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