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近五年来,已有人提出了几种模拟语言保密的新方法。这里,我们提出几种使用快速付氏变换算法的语言置乱器(FFT置乱器),同时还研究几个以前未曾讨论过的实用性项目。本文将介绍实验用的FFT置乱器的硬件结构,并讨论该装置在设计中必须考查的几项指标,比如帧结构、帧同步和频谱置换密钥的产生。最后,还将给出实验结果,并着重讨论保密性和通信质量问题,这对实际使用是非常重要的。
In the recent five years, several new methods have been proposed to keep language confidential. Here, we propose several language scramblers (FFT scrambler) that use the fast Fourier transform algorithm, as well as several practical projects that have not been discussed before. This article introduces the hardware structure of the experimental FFT scrambler and discusses several aspects that the device has to examine in the design, such as frame structure, frame synchronization, and spectrum replacement key generation. Finally, experimental results will be given, focusing on confidentiality and communication quality issues, which are important for practical use.