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在模拟话音保密机中,置乱加密话音被分成许多帧,然后将每一帧传送出去。本文介绍了一种用于传输模拟信号的窄带保密通信系统中密钥码的同步方法。它由始发电台产生连续的数字序列,对模拟信号的每一帧进行置乱,在发送置乱信号的整个过程中,周期性地发送数字序列,把它插入帧与帧之间。这样,接收电台至少能检出一个发送数字序列和一个发送置乱模拟信息。该方法特别适用于噪声或衰落易出现的传输环境。允许迟到而又合法的第三方进入该系统。
In analog voice privacy machines, scrambled encrypted voice is divided into many frames, and each frame is transmitted. This paper presents a method of key code synchronization in narrowband secure communication system for transmitting analog signals. It generates a continuous sequence of digits by the originating station, scrambling each frame of the analog signal, periodically transmitting the sequence of digits and inserting it between the frames during the entire period of the transmission of the scrambling signal. In this way, the receiving station can detect at least one transmit digital sequence and one send scrambling simulation. The method is particularly suitable for noise or fading prone transmission environment. Allow late but legal third parties to enter the system.