Hybrid encoding of data transmissions in a security system
US7500105B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Jul 13, 2004 |
| Grant date | Mar 3, 2009 |
| Priority date | — |
| Expiry date | Jan 30, 2027 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04L2001/0092
- WIPO fieldDigital communication
- WIPO sectorElectrical engineering
Abstract
A security system in which wireless transmitting security devices use a hybrid or dual encoding methodology, wherein a first part of a data message is encoded in a return-to-zero (RZ) format and a second part of the data message is encoded in a non-return-to-zero (NRZ) format, thereby increasing error detection and correction. In a first aspect of the invention, status information is included in the first part of the message and redundant status information is included in the second part of the message. In a second aspect of the invention, message sequence information is included in the second part of the message to avoid processing of stale or out-of-sequence messages.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.