| 摘要 |
<P>PROBLEM TO BE SOLVED: To reproduce a transmitted data signal of an IC card always correctly. <P>SOLUTION: A non-contact IC card reader is equipped with an antenna 13 which receives a signal outputted as a radio wave from the loaded IC card 11 and having the transmitted data signal superposed on a carrier, a rectifier circuit 22 which rectifies the signal received by the antenna, a detection circuit 23 which detects the envelope of the rectified signal outputted from the rectifier circuit, a phase shift circuit 26 which shifts the phase of an AC waveform component included in the detection signal outputted from the detection circuit by a specified quantity, and a comparator 25 which compares the signal level of the output signal of the phase shift circuit with the signal level of the detection signal of the detection circuit and outputs the comparison result as a reception data signal corresponding to the transmitted data signal of the IC card. <P>COPYRIGHT: (C)2004,JPO |
