Information processing terminal, IC card, portable communication device, wireless communication method, and program
First Claim
1. An information processing terminal that carries out contactless data transmission or reception with a reading or writing device by use of a magnetic field, the information processing terminal comprising:
- a data transmitter or receiver configured to generate an induced voltage from a magnetic field generated by the reading or writing device at the time of data reception, and send a transmission signal to the reading or writing device at the time of data transmission, wherein the induced voltage is direct current voltage;
a signal processor configured to generate a response signal based on the induced voltage; and
a load modulator configured to control a variable resistance based on the induced voltage and carry out load modulation of the transmission signal based on the response signal and the variable resistance.
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Accused Products
Abstract
An information processing terminal is disclosed that is allowed to carry out contactless data transmission or reception with a reading or writing device by use of a magnetic field. The information processing terminal includes a data transmitter or receiver, a signal processor, and a load modulator. The data transmitter or receiver is configured to generate an induced voltage from a magnetic field generated from the reading or writing device at the time of data reception, and send a transmission signal to the read/write reading or writing device at the time of data transmission. The signal processor is configured to generate a response signal based on the induced voltage. The load modulator controls a variable resistance based on the induced voltage and carries out load modulation relating to the transmission signal based on the response signal and the variable resistance.
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Citations
20 Claims
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1. An information processing terminal that carries out contactless data transmission or reception with a reading or writing device by use of a magnetic field, the information processing terminal comprising:
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a data transmitter or receiver configured to generate an induced voltage from a magnetic field generated by the reading or writing device at the time of data reception, and send a transmission signal to the reading or writing device at the time of data transmission, wherein the induced voltage is direct current voltage; a signal processor configured to generate a response signal based on the induced voltage; and a load modulator configured to control a variable resistance based on the induced voltage and carry out load modulation of the transmission signal based on the response signal and the variable resistance. - View Dependent Claims (2, 3, 4, 5, 6)
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7. An IC card that carries out contactless data transmission or reception with a reading or writing device by use of a magnetic field, the IC card comprising:
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a data transmitter or receiver configured to generate an induced voltage from a magnetic field generated by the reading or writing device at the time of data reception, and send a transmission signal to the reading or writing device at the time of data transmission, wherein the induced voltage is direct current voltage; a signal processor configured to generate a response signal based on the induced voltage; and a load modulator configured to control a variable resistance based on the induced voltage and carry out load modulation of the transmission signal based on the response signal and the variable resistance. - View Dependent Claims (8, 9, 10, 11)
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12. A portable communication device that carries out contactless data transmission or reception with a reading or writing device by use of a magnetic field, the portable communication device comprising:
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a data transmitter or receiver configured to generate an induced voltage from a magnetic field generated by the reading or writing device at the time of data reception, and send a transmission signal to the reading or writing device at the time of data transmission, wherein the induced voltage is direct current voltage; a signal processor configured to generate a response signal based on the induced voltage; and a load modulator configured to control a variable resistance based on the induced voltage and carry out load modulation of the transmission signal based on the response signal and the variable resistance. - View Dependent Claims (13, 14, 15, 16)
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17. A wireless communication method for contactless data transmission or reception with a reading or writing device by use of a magnetic field, the method comprising the steps of:
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generating an induced voltage from a magnetic field generated by the reading or writing device, wherein the induced voltage is direct current voltage; changing a value of a variable resistance based on the induced voltage; and carrying out load modulation based on the response signal and the variable resistance. - View Dependent Claims (18)
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19. A computer-readable medium comprising instructions executable by a computer processor to implement a method for contactless data transmission or reception with a reading or writing device by use of a magnetic field, the method comprising:
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generating an induced voltage from a magnetic field generated by the reading or writing device, wherein the induced voltage is direct current voltage; changing a value of a variable resistance based on the induced voltage; and carrying out load modulation based on the response signal and the variable resistance. - View Dependent Claims (20)
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Specification