Privacy communication method and privacy communication apparatus employing the same
US4742546A · kind A · utility
10Cited by
7References
9Claims
0Family size
Inventor
Key dates
| Filing date | Sep 14, 1983 |
| Grant date | May 3, 1988 |
| Priority date | — |
| Expiry date | Sep 14, 2003 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04K1/06
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
A privacy communication system in which signals transmitted from a transmitter are subjected to time base compression and expansion while the received signal is subjected to time base expansion and compression in synchronism with the expansion and compression occurring at the transmitter. The clock frequency of the clock in the transmitting and receiving ends are changed in the synchronism according to a predetermined algorithem.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.