摘要
超指向性扬声器是一种利用声波在空气中传播的非线性由不可听超声产生可听声的参量阵装置,这种声源相比相同大小的传统扬声器,可以产生非常强的指向性、像聚光灯光束一样的宽带可听声束。文章介绍了超指向性扬声器的基本原理,给出了一个基于模拟电路的系统实现方案,并着重介绍了基于所完成的工程样机所做的频率响应、总谐波失真和指向性测试及相关实验分析,还讨论了进一步工作的发展方向。
A device known as a parametric array employs the nonlinearity of the air to create an extremely directional audible sound from inaudible ultrasound. Comparing with the traditional loudspeakers of similar size, the extremely directional beams over a broad range of audible frequencies can be fromed. In this paper, an analog system is introduced after outlining a basic theoretical analysis of the audio beam loudspeaker. Detail results of acoustic measurements such as frequencies response, directionality and total harmonic distortion, are analyzed and interpreted. The further work is also put forward.
出处
《声学技术》
CSCD
北大核心
2008年第1期66-70,共5页
Technical Acoustics
关键词
超指向性扬声器
声学测量
指向性
参量阵
audio beam loudspeaker
acoustic measurement
directionality
parametric array
作者简介
通讯作者：杨益．E-mail：renxing926@hotmail．com
