基于超声调制的声频定向传播特性分析  

Analysis of Audio′s Directional Propagation Characteristics Based on Ultrasonic Modulation

作　　者：杜鹏[1] 汤惠[1] 曹光亮[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：《压电与声光》2015年第4期638-642,共5页Piezoelectrics & Acoustooptics

摘　　要：该文研制了一种基于超声调制的声频定向传播系统。将音频信号调制到超声载波上,经空气非线性作用解调后可产生具有指向性的声频信号。该文通过实验分析了超声调制的声频定向传播特性,分析比较了声频信号的强度与调制波频率、接收距离、接收角度等因素的关系。声频信号强度随着调制波频率、接收距离、接收角度等变化而变化。在90°角接收到的声频信号强度最大,其衰减速率也最快。同时,声频强度还随着调制波频率的变化呈非线性变化。An audio＇s directional propagation system based on ultrasonic modulation was developed in this work. The audio with a good directionality could be produced by modulating audio signal into ultrasonic carrier with the help of air＇s nonlinear effect. The audio＇s directional propagation characteristic was analyzed by experiment, and the relationships among the sound intensity and the frequency of modulated wave, receiving distance as well as receiving angle were discussed. The sound intensity varied along with the change of modulated wave＇s frequency, receiving distance and receiving angle. The sound intensity was maximum and the decay rate was the largest at the receiving angle of 90°. In additional, the sound intensity varied nonlinearly with the change of the modulated wave＇s frequen-cy.

关 键 词：声频定向 差频信号 超声换能器阵列 方向性 

分 类 号：TN912[电子电信—通信与信息系统]