| 声波定向传输实验系统的设计与研究 |
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| 引用本文： | 张雅丽,刘军.声波定向传输实验系统的设计与研究[J].通信技术,2009,42(11):19-21. |
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| 作者姓名： | 张雅丽 刘军 |
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| 作者单位： | 中国人民公安大学安全防范系,北京,100038 |
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| 摘 要： | 文中实验系统选用超声波作为载波,通过无线电调幅技术,以单频声信号调制超声波,并经换能器发射调幅波,调幅波在传播过程中因空气的非线性作用而自解调,还原出单频声信号,从而实现声音信号的定向传播。文中说明了该实验系统的组成结构、工作原理和功能特点,实验结果表明文中所采用技术和系统,在一定条件下能较好地实现声频信号在确定方向内的传播。
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| 关 键 词： | 声波 定向传输 调制 |
Design and Research on Directional Technology of Sound Wave |
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| ZHANG Ya-li,LIU Jun.Design and Research on Directional Technology of Sound Wave[J].Communications Technology,2009,42(11):19-21. |
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| Authors: | ZHANG Ya-li LIU Jun |
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| Affiliation: | (Department of Security and Defenses Chinese People＇s Public Security University, Beijing 100038, China) |
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| Abstract: | The laboratory system uses ultrasonic as a carrier wave, by wireless amplitude modulation and with monochromatic signals modulating the ultrasonic, transmits the amplitude-modulated wave through transducer. And the amplitude-modulated wave is self-demodulated owing to the aerial nonlinear action in the process of transmission, thus the monochromatic sound signal is recovered, and the directional transmission of sound wave realized. The paper describes the constitution, working principle and function of the laboratory system. The experimental result indicates that the technology and system could realize directional transmission of sound wave in certain condition. |
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| Keywords: | sound wave directional transmission modulation |
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