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瑞典AB Tranvertex公司现已设计出一种当可靠保护特别重要时使用的高保密加密终端机SV-250。该设备可用于数据传输速率为2400比特/秒或1200比特/秒的任何电话信道(即有线线路和载波机、微波和卫星线路)。它使用一台信道声码器将模拟语言信号转换为数字式脉冲序列。继这个最初的一级之后为数字式语言信号的逐比特加密,这是通过加进由该公司描述为是一种极端安全的密码系统所产生的数字叠加序列来实
AB Tranvertex in Sweden has now designed SV-250, a high-security, encrypted terminal for use where reliable protection is of particular importance. The device can be used for any telephone channel (ie wireline and carrier, microwave and satellite) with a data transfer rate of 2400 bits / second or 1200 bits / second. It uses a channel vocoder to convert analog speech signals to digital pulse sequences. Following this initial level is a bit-by-bit encryption of the digital speech signal by adding the digital superposition sequence produced by the company as an extremely secure cryptographic system