能量对比度控制方法在防激光窃听中的应用  

Application of energy contrast control method in anti-laser-eavesdropping

作　　者：韩璐 张桃明 吴鸣[1,2] 高小轶 杨军 HAN Lu;ZHANG Taoming;WU Ming;GAO Xiaoyi;YANG Jun(Key Laboratory of Noise and Vibration Research,Institute of Acoustics,Beijing 100190,China;University of Chinese Academy of Sciences,Beijing 100049,China;CACC Southwest Design and Research Institute Co.,Ltd.,Chengdu 610202,China)

机构地区：[1]中国科学院声学研究所噪声与振动重点实验室,北京100190 [2]中国科学院大学,北京100049 [3]民航机场建设集团西南设计研究院有限公司,成都610202

出　　处：《应用声学》2025年第2期371-376,共6页Journal of Applied Acoustics

基　　金：智能感知条件下机场鸟击综合防范系统研究项目。

摘　　要：通过在窗户玻璃上施加振动产生干扰信号可以掩盖掉人声信号,达到防激光窃听的目的。同时希望在驱动玻璃振动的同时,降低对房间内说话人的噪声干扰。因此提出一种基于能量对比度控制的方法,降低对空间中特定区域的辐射声场。用作动器阵列驱动平板振动,通过作动器到振动和声场控制点的传递函数,最大化振动平板的平均动能与目标区域内声场的平均声能之比,优化作动器阵列的权向量。利用矩形铝板进行实验,采用4个作动器,通过算法控制后相比于不做控制的情况,在1004000Hz范围内,平均振动动能相同的条件下,辐射声能量能够降低9.85dB。说明该方法在提供同样振动能量的同时,减弱了对目标区域内的声场辐射。By driving vibration of the window glass to produce interference signals can mask the voice signal,to achieve the purpose of anti-laser-eavesdropping.It is also desired to reduce noise interference to the speaker in the room,when the glass is driven.Therefore,an energy contrast control method is proposed to reduce the radiated sound field to the specific region in space.An array of actuators is used to drive the vibration of a flat panel.The weight vector of the actuator array is optimized by maximizing the ratio of the average kinetic energy of the vibrating panel to the average acoustic energy of the sound field in the target area using the transfer functions from the actuators to the control points of the vibration and acoustic fields.Experiment is conducted using a rectangular aluminum panel and 4 actuators.With the same average kinetic energy,the radiated sound energy of the proposed method is reduced by 9.85 dB in the frequency range of 100 Hz to 4000 Hz compared to the case without control.It is shown that the method can attenuate the radiated sound f ield in the target region while providing the same vibrational energy.

关 键 词：能量对比度控制 作动器阵列 平板声辐射 防激光窃听 

分 类 号：TB535[理学—物理]