Read-write processing apparatus and method for RFID tag
First Claim
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1. An apparatus for communicating with an RFID tag provided with a semiconductor memory to read and write data from and into said semiconductor memory, said apparatus comprising:
- wait condition setting means for setting a wait condition prior to a communication with said RFID tag, only a carrier wave being transmitted under said wait condition;
noise level extracting means for extracting as noise level a level from a reception signal obtained under said wait condition; and
reporting means for displaying or outputting said extracted noise level.
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Abstract
A read-write processing apparatus communicates with an RFID tag provided with a semiconductor memory to exchange commands and responses through antenna coils. A condition under which only a carrier wave is transmitted is set prior to a communication with the RFID tag and a level from a reception signal obtained under this condition is extracted as noise level. The extracted noise level is displayed or outputted to an output host apparatus.
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Citations
9 Claims
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1. An apparatus for communicating with an RFID tag provided with a semiconductor memory to read and write data from and into said semiconductor memory, said apparatus comprising:
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wait condition setting means for setting a wait condition prior to a communication with said RFID tag, only a carrier wave being transmitted under said wait condition;
noise level extracting means for extracting as noise level a level from a reception signal obtained under said wait condition; and
reporting means for displaying or outputting said extracted noise level. - View Dependent Claims (2)
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3. An apparatus for communicating with an RFID tag provided with a semiconductor memory to read and write data from and into said semiconductor memory, said apparatus comprising:
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signal extracting means for extracting level of a data signal and level of a base signal from a signal being received in a communication process with said RFID tag, said data signal and said base signal respectively corresponding to a period during which said RFID tag switches and does not switch impedance periodically;
calculating means for calculating the ratio or the difference between the levels of said data signal and said base signal; and
reporting means for displaying or outputting result of calculation by said calculating means. - View Dependent Claims (4, 5, 6)
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7. An apparatus for communicating with an RFID tag provided with a semiconductor memory to read and write data from and into said semiconductor memory, said apparatus comprising:
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wait condition setting means for setting a wait condition prior to a communication with said RFID tag, only a carrier wave being transmitted under said wait condition;
noise level extracting means for extracting as noise level a level from a reception signal obtained under said wait condition; and
communication control means for discontinuing said wait condition and starting a communication with said RFID tag after a condition in which said noise level remains smaller than a specified value has continued for a specified length of time.
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8. A method of communicating with an RFID tag provided with a semiconductor memory to read and write data from and into said semiconductor memory, said method comprising the steps of:
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setting a wait condition prior to a communication with said RFID tag, only a carrier wave being transmitted under said wait condition;
extracting as noise level a level from a reception signal obtained under said wait condition; and
displaying or outputting said extracted noise level.
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9. A method of communicating with an RFID tag provided with a semiconductor memory to read and write data from and into said semiconductor memory, said method comprising the steps of:
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extracting level of a data signal and level of a base signal from a signal being received in a communication process with said RFID tag, said data signal and said base signal respectively corresponding to a period during which said RFID tag switches and does not switch impedance periodically;
calculating the ratio or the difference between the levels of said data signal and said base signal; and
displaying or outputting result of calculation by said calculating means.
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Specification