Registers – Records – Conductive
Patent
1997-06-10
2000-10-03
Hajec, Donald
Registers
Records
Conductive
235380, G06K 500
Patent
active
061260770
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.
REFERENCES:
patent: 5175418 (1992-12-01), Tanaka
patent: 5362954 (1994-11-01), Komatsu et al.
patent: 5418353 (1995-05-01), Katayama et al.
patent: 5469512 (1995-11-01), Fujita et al.
Arisawa Shigeru
Iga Akira
Kusakabe Susumu
Tanaka Katsuyuki
Hajec Donald
Oh Seong-Kun
Sony Corporation
Tremblay Mark
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