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一、引言模拟信号的保密处理方法主要有两类,一类是在信号本身的幅值、频域及时域进行变换来实现置乱;另一类是借助于信号的运算,将一个附加信号(单频、杂音等)混掺进语音信号,从而达到伪装、掩盖的目的。然而,这两种方法之间也没有明确的界线,因有些变换也要借助于信号操作实现,若附加信号过于简单,信号运算只能使得语言信号在频域变换。不过,分类的合理与否,定义的严格与否,都是无关紧要的。重要的是在于了解实际的保密手段,了解各种保密方法的保密效果。属于变换类处理的模拟保密机已在我国广泛使用,属于后一类处理的模拟保密
I. INTRODUCTION There are mainly two types of confidential handling of analog signals. One is to change the amplitude, the frequency domain and the time domain of the signal to realize scrambling. The other is to use the signal operation to add an additional signal Single frequency, noise, etc.) mixed into the voice signal, so as to achieve disguise, cover up the purpose. However, there is no clear boundary between these two methods either. Some transformations are also implemented by means of signal operations. If the additional signals are too simple, the signal operation can only make the speech signal transform in the frequency domain. However, the classification is reasonable or not, the definition of strict or not, it does not matter. It is important to understand the actual means of confidentiality and to understand the secrecy of various methods of confidentiality. The analog security machine that belongs to the transformation class has been widely used in our country and belongs to the latter category of analog security