关于国外的保密机产品,已经有不少文章进行了报道和介绍,其中,对STU—Ⅲ保密话机的介绍尤为详尽。不过,从已有的报道来看,对保密机产品的技术性能、品种及生产厂家的介绍仍嫌不够。为此,特将国外十二家公司推出的话音/数据保密机及其大致性能罗列于后,供有关人士参考。 There are a lot of articles on foreign confidential machine products were reported and introduced, among them, the introduction of STU-III confidential telephone is particularly exhaustive. However, judging from the existing reports, there is still not enough information on the technical performance, variety and manufacturer’s introduction of security products. To this end, especially the voice of foreign companies introduced twelve voice / data security machine and its approximate performance listed later, for reference.