语音混沌掩盖保密通信系统研究与实现  

Study on the Security of Speech Chaotic Masking Communication and Its Implementation

作　　者：翁贻方[1] 郑德玲[1] 鞠磊[2] 章雪晴[3] 张杜 

机构地区：[1]北京科技大学信息工程学院 [2]北京电子科技学院通信工程系 [3]北京工商大学信息工程学院,北京100037

出　　处：《微计算机信息》2007年第26期182-184,共3页Control & Automation

基　　金：北京市优秀人才专项经费资助项目(20041D0500309)

摘　　要：本文在DSP平台上构建了实时语音混沌掩盖保密通信系统。首先通过分析混沌掩盖信号和语音信号的功率谱,研究了安全性,从而给出了低通滤波器和放大器相结合的方法,产生适用于混沌掩盖的信号。其次针对DSP系统发送端和接收端的同步误差积累导致失步问题,给出周期强制同步方法,使同步误差被控制在峰-峰值100mV～250mV的范围内。实现了基于Lorenz系统的语音混沌掩盖保密通信,通信的语音质量基本满足要求。A real-time speech chaotic masking secure communication was built up on DSP platform. The spectrum testing and analysis of original chaotic variable compare with the speech signal has been done. Since it is not safe for chaotic masking, a kind of Low- pass - Filter-Amplifier methodology was given to generate suitable chaotic masking signal for safety. The other problem is to decrees synchronized error. By the new method of periodic forced synchronization, the peak-to-peak error then was controlled at the range of less than 250mv. The experiments of DSP real-time speech chaotic masking secure communication based on Lorenz equations was imolemented, and the broadcasting auality of soeech is auite satisfied.

关 键 词：混沌掩盖 安全性 保密通信 同步 功率谱 语音信号 

分 类 号：TP273[自动化与计算机技术—检测技术与自动化装置] TP391[自动化与计算机技术—控制科学与工程]