Noncontact information carrier reader and method of reading information stored in a noncontact information carrier
AssigneeDenso Wave Incorporated
InventorMasahiro Takiguchi
Life of this patent
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Abstract
In a noncontact information carrier reader, a receiving unit receives a response wave transmitted from a noncontact information carrier. The response wave is generated by modulating the carrier wave based on a response signal. An amplifying unit amplifies carrier wave components contained in the received response wave based on a first gain, and amplifies response signal components contained in the received response wave based on a second gain. The second gain is higher than the first gain. A synchronized-detection demodulator demodulates the response signal components contained in the response wave by mixing the transmitted carrier wave and the response wave amplified by the amplifying unit.
Claims8
A noncontact information carrier reader for transmitting a carrier wave to a noncontact information carrier, the noncontact information carrier reader comprising:
- a receiving unit configured to receive a response wave transmitted from the noncontact information carrier, the response wave being generated by modulating the carrier wave based on a response signal in the noncontact information carrier;
- an amplifying unit configured to amplify carrier wave components contained in the received response wave based on a first gain and to amplify response signal components contained in the received response wave based on a second gain, thereby outputting the amplified response signal, the second gain being higher than the first gain;
- and
- a synchronized-detection demodulator configured to demodulate the response signal components contained in the response wave by mixing the transmitted carrier wave and the response wave amplified by the amplifying unit.
A method of reading a response data stored in a noncontact information carrier, the method comprising:
- transmitting a carrier wave to a noncontact information carrier;
- receiving a response wave transmitted from the noncontact information carrier, the response wave being generated by modulating the carrier wave based on a response signal in the noncontact information carrier;
- amplifying carrier wave components contained in the received response wave based on a first gain;
- amplifying response signal components contained in the received response wave based on a second gain, the second gain being higher than the first gain;
- and
- demodulating the response signal components contained in the response wave by mixing the transmitted carrier wave and the response wave amplified by the amplifications.
Dependencies are inferred from the claim text.