论文部分内容阅读
本文介绍的全双工模数模语音置乱系统采用一种无需帧同步的置乱算法置乱语音信号,并以自适应回波抵消技术消除系统中的回波干扰。文中研究了语音置乱处理对自适应滤波算法性能的影响,导出了回波抵消的理论性能与自适应滤波器阶数的关系,对系统样机进行了实际性能测试。这种全双工模拟语音置乱系统可望用于移动通信网络和普通电话网络。
The full-duplex analog-to-digital voice scramble system introduced in this paper uses a scrambling algorithm without frame synchronization to scramble voice signals and cancels echo interference in the system by using adaptive echo cancellation technology. In this paper, the influence of voice scrambling on the performance of adaptive filtering algorithm is studied. The relationship between the theoretical performance of the echo cancellation and the order of the adaptive filter is derived, and the actual performance of the system prototype is tested. This full-duplex analog voice scramble system is expected to be used in mobile communication networks and ordinary telephone networks.