一种基于超声波的窃听方法  

An eavesdropping method based on ultrasonic

作　　者：林科业[1] 孙番典[1] 刘诗伟[1] 梁生辉[1] 

机构地区：[1]华南师范大学,广东广州510631

出　　处：《现代电子技术》2012年第3期196-198,共3页Modern Electronics Technique

摘　　要：提出一种超声窃听方法,并简要地介绍其工作原理和实现方式。该方法用超声波传感器发射和接收40kHz频率的超声波,由超声发射探头朝待测波源处发射等幅超声波信号,在声源处被声音信号调制,反射回来的信号被超声波接收探头接收,并经接收模块进行检波、滤波、功率放大等处理,实现声音的还原,达到窃听的效果。A method of ultrasonic eavesdropping and its operating principle and implementations are introduced. This method used ultrasonic sensors to launch and receive 40kHz ultrasonic, and transmitted equiamplitude ultrasonic signals to under test wave source by ultrasound probe launch. The equiamplitude signals were modulated by source signals from sound source. The reflected signal was received by ultrasound probe and processed by detection, filtration and power amplification after receiving module. The voice reduction and eavesdropping can be realized.

关 键 词：超声波窃听 音频调制 声音还原 检波电路 

分 类 号：TN711-34[电子电信—电路与系统]