Scrambler key code synchronizer
US4434323A · kind A · utility
184Cited by
23References
17Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jun 29, 1981 |
| Grant date | Feb 28, 1984 |
| Priority date | — |
| Expiry date | Jun 29, 2001 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04K1/00
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
A method for synchronizing the scrambling sequences of communicating scrambler units of a privacy communications system in a reliable and secure manner. The method is particularly adapted for use in noisy or fade prone transmission environments, and permits late entry of authorized third parties to the system. The method utilizes digital sequences interleaved periodically with scrambled analog information to provide reliable synchronization.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.