Self-synchronizing infra-red communication system
US5128792A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Nov 6, 1989 |
| Grant date | Jul 7, 1992 |
| Priority date | — |
| Expiry date | Nov 6, 2009 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04L25/493
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
A self-synchronizing infra-red communication system. The coding scheme involves transmitting a series of pulses, the separations between successive pulses representing the same data. Even though the separations between successive pulses all represent the same data, the separations are all different; it is this feature which allows for self-synchronization. Arrival times of successive pulses are recorded; the arrival times represent the receipt not only of transmitted pulses, but also of detected noise. The time differences between all arrival times (not only successive arrival times) are checked for consistency with predetermined allowable time-interval ranges which can separate successively transmitted pulses in a data sequence. When a sufficient number of such checks have been made, representing a sufficient degree of redundancy, it is possible to derive the data value represented by all of the pulse separations.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.