Card reader and method of operating the same
First Claim
1. A card reader configured to communicate with a card via one or more communication pulses, the card reader comprising:
- a first pulse generation circuit configured to generate a first detection pulse to detect the card;
a second pulse generation circuit configured to generate one or more second detection pulses to detect the card by modifying at least one communication pulse of the one or more communication pulses such that the one or more second detection pulses always have shorter guard times than the at least one communication pulse irrespective of frequencies of the one or more second detection pulses and the at least one communication pulse; and
a card detection circuit configured to detect the card based on a reflection signal received in response to the first detection pulse or the one or more second detection pulses;
wherein the second pulse generation circuit is configured to generate the one or more second detection pulses by reducing a size of a front one of the guard times occurring prior to a command in the at least one communication pulse and a rear one of the guard times occurring after the command.
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Abstract
A card reader performing a wireless communication with a card includes a first pulse generation unit generating a first detection pulse for detecting the card, a second pulse generation unit generating a plurality of second detection pulses for detecting the card, or a plurality of communication pulses for communicating with the card, and a card detection unit for sensing a card being detected by the first detection pulse or the second detection pulses. In the case that the card is not sensed through the first detection pulse, the second pulse generation unit generates the second detection pulses using the communication pulses and senses the card using the second detection pulses.
16 Citations
17 Claims
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1. A card reader configured to communicate with a card via one or more communication pulses, the card reader comprising:
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a first pulse generation circuit configured to generate a first detection pulse to detect the card; a second pulse generation circuit configured to generate one or more second detection pulses to detect the card by modifying at least one communication pulse of the one or more communication pulses such that the one or more second detection pulses always have shorter guard times than the at least one communication pulse irrespective of frequencies of the one or more second detection pulses and the at least one communication pulse; and a card detection circuit configured to detect the card based on a reflection signal received in response to the first detection pulse or the one or more second detection pulses; wherein the second pulse generation circuit is configured to generate the one or more second detection pulses by reducing a size of a front one of the guard times occurring prior to a command in the at least one communication pulse and a rear one of the guard times occurring after the command. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A method of operating a card reader to detect a card, the card reader configured to communicate with the card via one or more communication pulses, the method comprising:
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generating a first detection pulse to detect the card; periodically outputting the first detection pulse to detect the card; determining whether the card is detected; generating one or more second detection pulses by modifying at least one communication pulse of the one or more communication pulses such that the one or more second detection pulses always have shorter guard times than the at least one communication pulse irrespective of frequencies of the one or more second detection pulses and the one or more communication pulses; and sequentially outputting the one or more second detection pulses based on a determination whether the card is detected; wherein the generating the one or more second detection pulses includes reducing a size of a front one of the guard times occurring prior to a command in the at least one communication pulse and a rear one of the guard times occurring after the command. - View Dependent Claims (9, 10, 11)
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12. A card reader configured to communicate with a card via one or more communication pulses, the card reader comprising:
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an antenna; and
a processor configured to,output, via the antenna, a first detection pulse to detect the card, generate one or more second detection pulses by modifying at least one communication pulse of the one or more communication pulses such that the one or more second detection pulses always have shorter guard times than the at least one communication pulse irrespective of frequencies of the one or more second detection pulses and the at least one communication pulse, and output, via the antenna, the one or more second detection pulses, if the card is not detected by the first detection pulse;
wherein the processor is configured to generate the one or more second detection pulses by reducing a size of a front one of the guard times occurring prior to a command in the at least one communication pulse and a rear one of the guard times occurring after the command.- View Dependent Claims (13, 14, 15, 16, 17)
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Specification