Number | Name | Date | Kind |
---|---|---|---|
4171513 | Otey et al. | Oct 1979 | |
4179657 | Hobbs | Dec 1979 | |
4467141 | Resch et al. | Aug 1984 |
Entry |
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Electronics, vol. 49, No. 15, Jul. 22, 1976, pp. 8E, 10E, "Marconi Introduces Digital Family for Encrypting Civilian Transmissions". |
IBM Technical Disclosure Bulletin, vol. 21, No. 5, Oct. 1978, pp. 2156-2157, Waldbaum, "Cryptographic Voice Communications Using Digital Data Processing Devices". |
Intelcon 79 Exposition Proceedings, Feb. 26-Mar. 2, 1979, pp. 10-13, deLellis, "Linear Prediction Techniques for Digital Secure Voice Systems." |