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本文评述了主要类型的话音保密机,并讨论了它们在便携式和车载无线收发报机上的适用性,对现有保密机的调查表明,有必要研制一种价廉物美、中等保密程度、狭带、无延迟的话音保密机。文中报导了这种保密机(MISTIC)的研制及其所达到的保密水平,并详尽地介绍了该机性能。
This article reviews the major types of voice privacy machines and discusses their applicability to portable and vehicular radios. The investigation of existing security machines shows that it is necessary to develop a low-cost, medium-security, , No delay voice security machine. This article reports the development of this kind of secret machine (MISTIC) and the level of secrecy it achieves, and gives a detailed introduction to the performance of this machine.