Method of operating contactless IC card reader, detection circuit of contactless IC card reader, contactless IC card reader and card system including the same
US9218518B2 · kind B2 · utility
5Cited by
8References
30Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Mar 12, 2014 |
| Grant date | Dec 22, 2015 |
| Priority date | — |
| Expiry date | Mar 12, 2034 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06K7/10039
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
A method of operating a contactless integrated circuit (IC) card reader includes calculating a first transition time of at least one first magnetic pulse during a first transition interval and calculating a second transition time of a second magnetic pulse during a second transition interval. The first transition time is calculated in a calibration phase, and the second transition time is calculated in a detection phase. A contactless IC card is determined to be within a communication rage of the reader based on a comparison of the first and second transition times.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.