Number | Name | Date | Kind |
---|---|---|---|
3824467 | French | Jul 1974 | |
4169245 | Crom et al. | Sep 1979 | |
4188616 | Kazami et al. | Feb 1980 | |
4392021 | Slate | Jul 1983 | |
4434323 | Levine et al. | Feb 1984 | |
4811394 | Ragavan et al. | Mar 1989 | |
4937867 | Kasparian et al. | Jun 1990 | |
5029340 | Hashimoto | Jul 1991 | |
5319707 | Wasilewski et al. | Jun 1994 | |
5351300 | Quisquater et al. | Sep 1994 | |
5379345 | Greenberg | Jan 1995 | |
5768374 | Poulsen | Jun 1998 | |
5802076 | Weigand et al. | Sep 1998 |
Number | Date | Country |
---|---|---|
57-113647 | Jul 1982 | JPX |
Entry |
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IBM Technical Disclosure Bulletin, vol. 23 No. 1 Jun. 1980 Digital Speech Scrambler--P.A. Franaszek. |