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为提高模拟语音保密体制的保密性能,国外在八十年代初期开始研制时域、频域同时置换的二维置乱体制。为了迎头赶上国外的发展,我们亦应尽快研制此种置乱技术。本文共分四部份:第一部份简要介绍了以微处理器、单片微计算机实现的时段置换与频谱倒置、频散相组合的二维体制,指出其优、缺点。第二,三部份较详细地阐述了时段、频段同时置换的二维置乱体制的工作原理、硬件原理框图、各主要部件作用、置乱的工作过程。第四部份对此种二维体制从保密性能、解密语音质量、成本三项主要指标进行了论证。该体制虽成本较昂贵,但保密性能高,解密语音质量好,因此,高级模拟语音保密机可采用此种体制。
In order to improve the confidentiality of analog voice security system, foreign countries began to develop the two-dimensional scrambling system with time-domain and frequency-domain simultaneous replacement in the early 1980s. In order to catch up with the development of other countries, we should also promptly develop such a disruptive technology. This article is divided into four parts: The first part briefly introduces the two-dimentional system which combines the period replacement, the spectral inversion and the dispersion together with microprocessor and single-chip microcomputer, and points out its advantages and disadvantages. In the second and the third parts, the working principle, the hardware block diagram, the function of the main components and the working process of the disorganization are elaborated in more detail. The fourth part of this two-dimensional system from the confidentiality, decryption voice quality, cost three key indicators were demonstrated. Although this system is more costly, but with high confidentiality and good decryption voice quality, such a system can be adopted by advanced analog voice security machines.