Data processing apparatus and method and data transmitting/receiving apparatus and method
US6126077A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jun 10, 1997 |
| Grant date | Oct 3, 2000 |
| Priority date | — |
| Expiry date | Jun 10, 2017 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06K7/0008
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
Method and apparatus for providing communication with a higher communication rate while maintaining the occupied frequency band narrow, a signal processing unit of a reader/writer unit Biphase Shift Keying (BPSK)-modulates data to be transmitted, and thereafter outputs the modulated signal to a modem. The modem Amplitude Shift Keying (ASK)-modulates the modulated signal and outputs the ASK-modulated signal to a first loop coil. The first loop coil generates a magnetic field corresponding to the modulated wave. An IC card converts a part of the magnetic field radiated from the reader/writer unit with another loop coil to generate a power source from the electrical signal, and also extracts the data transmitted. In the case of transmitting the data to the reader/writer unit, a load of another loop coil is changed in accordance with the data. The reader/writer unit detects, with the first loop coil, any change in load of another loop coil of the IC card magnetically coupled with the first loop coil.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.