| 摘要 |
PROBLEM TO BE SOLVED: To provide a card in which noise can easily by reduced and which can deal with plural communication protocols by providing a reception means judging it to be noise when a prescribed bit in reception data cannot be detected and a transmission means judging it to be noise when the prescribed bit in transmission data cannot be detected. SOLUTION: The carrier of a data signal which is PSK-modulated through connection coils 1a and 1b provided for a card reader/writer 1 is transmitted to the non-contact IC card P. In the IC card P, the reception means judges it to be noise when the prescribed bit in reception data cannot be detected even if the change point of reception data is detected. Then, an information processing based on reception data is not executed. The transmission means judges it to be noise when the prescribed bit in transmission data cannot be detected even if the change point of transmission data is detected. Transmission data is sampled again, it is converted into the carrier of the prescribed frequency and it is not transmitted to outside. |
