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据《Jane’s Military Communications 1990-91》报道:西德“Tele SecurityTimmann”公司已研制出一种型号为TST 7700的袖珍式话音编码机。它满足军用技术条件,适用于双线电话和四线VHF/UHF全双工无线链路。其编码过程采用基于LPC原理的专利算法。TST 7700编码机的族密钥为10~(45),报文密钥为10~(13),主密钥为10~(16),辅助密钥为10~(16)。该机可有贮9个密钥且其密钥周期为10~(80)。
According to “Jane’s Military Communications 1990-91” reported: West Germany “Tele SecurityTimmann” company has developed a model TST 7700 pocket-sized voice encoding machine. It meets military technical conditions and is suitable for two-wire phones and four-wire VHF / UHF full-duplex wireless links. The encoding process uses a patented algorithm based on the LPC principle. The TST 7700 codec has a family key of 10 to 45, a packet key of 10 to 13, a master key of 10 to 16, and a secondary key of 10 to 16. This machine can store 9 keys and its key period is 10 ~ (80).