Data communication system, data communication device, contactless communication medium, and communication device control program
AssigneeSeiko Epson Corporation
InventorHideaki Yamada
Life of this patent
Estimating the term…
Abstract
A radio frequency identification system is provided having a data communication device and a contactless identification tag. The data communication device has an antenna coil, a first data receiving unit, a first data transmitting unit, a first data control unit, and a first data storing unit. Further, the contactless identification tag has an antenna coil, a second data receiving unit, a second data transmitting unit, a second data control unit, a second data storing unit, and a driving power generating unit. The first data control unit generates negative logic digital signals of transmission data. The first data transmitting unit modulates the digital signals and transmits the modulated signals.
Claims7
A data communication system comprising:
- a data communication device comprising:
- a first data control unit that generates negative logic digital signals based on transmission data;
- and
- a first data transmitting unit that generates a first carrier waves by modulating the negative logic digital signals and that transmits the first carrier waves;
- and
- a contactless communication medium that performs wireless data communications between the data communication device and the contactless communication medium,
- the data communication device transmits carrier waves having a first and a second amplitude level:
- the first amplitude level corresponds to logic 0;
- and
- the second amplitude level corresponds to logic 1, wherein the first amplitude level exceeds the second amplitude level.
Dependencies are inferred from the claim text.