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:
- signal extracting means for comparing, while known data are being transmitted from said RFID tag in a communication process with said RFID tag, said known data and a base signal being received and thereby extracting a known data signal level corresponding to a period during which said RFID tag switches impedance periodically and another base signal level corresponding to another period during which impedance is not switched periodically;
calculating means for calculating the ratio or the difference between the levels of said known data signal and said base signal; and
reporting means for displaying or outputting result of calculation by said calculating means.
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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
5 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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signal extracting means for comparing, while known data are being transmitted from said RFID tag in a communication process with said RFID tag, said known data and a base signal being received and thereby extracting a known data signal level corresponding to a period during which said RFID tag switches impedance periodically and another base signal level corresponding to another period during which impedance is not switched periodically; calculating means for calculating the ratio or the difference between the levels of said known data signal and said base signal; and reporting means for displaying or outputting result of calculation by said calculating means. - View Dependent Claims (2, 3, 4)
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5. 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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comparing, while known data are being transmitted from said RFID tag in a communication process with said RFID tag, said known data and a base signal being received and thereby extracting a known data signal level corresponding to a period during which said RFID tag switches impedance periodically and another signal level corresponding to another base period during which impedance is not switched periodically; calculating the ratio or the difference between the levels of said known data signal and said base signal; and displaying or outputting result of calculation by said calculating means.
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Specification