High security evolutive coding process and device for carrying out this process
US4922533A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Oct 29, 1987 |
| Grant date | May 1, 1990 |
| Priority date | — |
| Expiry date | Oct 29, 2007 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG07C2009/00769
- WIPO fieldControl
- WIPO sectorInstruments
Abstract
An evolutive coding process using a pseudo-random discontinuous function for coding remote controls, such as for automobiles. A message containing at least two pseudo-random values calculated by the pseudo-random discontinuous function is transmitted. Preferably the pseudo-random values are successive values of the pseudo-random discontinuous function, and the message optionally includes a code derived as a function of a specific base code associated with the system. The general preferred form of complete code message may take the form T(C) plus FA(C,n-1), plus FA(C,n) where T is a continuous function and FA is a pseudo-random discontinuous function.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.