Number | Name | Date | Kind |
---|---|---|---|
3662383 | Ajamani et al. | May 1972 | |
3842218 | DeLuca et al. | Oct 1974 | |
3848241 | LeNay et al. | Nov 1974 | |
3982242 | Sheffield et al. | Sep 1976 | |
4076970 | Lubarsky, Jr. et al. | Feb 1978 | |
4245343 | Frey | Jan 1981 | |
4249166 | Schultz | Feb 1981 | |
4374436 | Armstrong | Feb 1983 | |
4520234 | Fields et al. | May 1985 | |
4533914 | Norling et al. | Aug 1985 | |
4538033 | Bruce et al. | Aug 1985 | |
4554418 | Toy | Nov 1985 | |
4588181 | Blanchard et al. | Dec 1985 | |
4661969 | Butler et al. | Apr 1987 |
Entry |
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Rabiner et al., "Digital Techniques for Computer Voice Response: Implementations and Applications", Proceedings of the IEEE, vol. 64, No. 4, Apr. 1976, pp. 416-433. |
Mike Schwartz, "How to Shop for Electronic Protection", Jeweler's Circular-Keystone, Feb. 1984, pp. 272-288. |