超声调制的声频定向传输指向性分析  

The Directivity Analysis of Ultrasound- modulated Audio Directional Transmission

作　　者：杜鹏[1] 姜楠[1] 宋波[1] 

机构地区：[1]电子科技大学电子科学技术研究院,四川成都611731

出　　处：《电声技术》2015年第12期40-45,52,共7页Audio Engineering

摘　　要：音频信号的指向性要求是声频定向传输系统的根本要求。使用单个超声波换能器很难达到指向性要求,需要使用超声波换能器阵列。超声换能器阵列的参数性质在一定程度上决定了声频定向传输的指向性。通过详细的理论推导与计算,分析了影响超声调制的声频定向传输指向性的相关参数。通过分析计算得到,声频定向传输指向性与超声波换能器阵列排列形式、换能器阵列中各个振元的间距、振元个数以及载波频率等有关。在设计声频定向传输系统时需要结合实际要求,综合考虑定向传输的指向性和传输效率选择载波频率和设计超声波换能器阵列。In the applications of directional audio transmission, the directivity is a fundamental requirement. It is difficult to achieve this requirement using a single ultrasonic transducer. So the ultrasonic transducer array is needed. The array＇ s pa- rameters and properties determine the audio directional transmission direetivity to some extent. In this paper, the parameters related to the directivity of ultrasound - modulated audio directional transmission are analyzed by a detailed theoretical deri- vation and calculation. Through the analysis and calculation, it is known that the direetivity of directional audio sound can be influenced greatly by the change of the form of the array, the spacing between two transducers, the number of transducers as well as the carrier frequency. So the impact of these parameters should he taken into consideration during design of audio di- rectional transmission system.

关 键 词：声散射理论 声频定向 指向性 超声换能器阵列 

分 类 号：TB559[理学—物理]