一种语音混沌保密通信方案的研究与硬件实现

在硬件实验研究的基础上，建立一种环形蔡氏电路，提出用环蔡氏电路实现语音混沌保密通信的一种闭环逆系统方案，其特点是利用环形蔡氏电路的单向耦合原理，通过反馈的方法形成一个包括有用信号在内的极联闭合环路，从而实现改善端与接收端之间混沌系统的严格同步而不受有用信息调制的影响。理论分析与硬件实验结果证明，该方案同现有的其它混沌通信方案相比较，具有非线性失真小、保真度高的优点，完全能够满足传送语音信号的要求。

The research and hardware implementation of a scheme for chaotic secure communications

On the basis of hardware experimental research, a loop Chua's circuit is established, and a scheme with closed loop inverse system for chaotic communication based on loop Chua's circuits is presented. According to the principle of unidirectionally couple in loop Chua's circuit, a stage joining closed loop including information is obtained through feedback and the full synchronization between transmitting end and receiving end not affected by information modulation is achieved. Theoretic analysis and hardware experiment have demonstrated that the presented scheme has low nonlinear distortion and high fidelity compared with other existing chaotic communication schemes, and can satisfy the demand of transmitting speech and music signals.