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

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.