| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To provide a data transmission and reception system capable of demodulating data precisely with a simple configuration in communication using amplitude modulation. <P>SOLUTION: In the data transmission and reception system, each bit of data transmitted at the side of an IC card 10 is diffused by an equilibrium sequence. At the side of an IC card reader/writer 20, an internal multiplier multiplies the equilibrium sequence used at the side of the IC card 10 by a received signal, thus setting the contribution of a DC content (an amplitude value) in a signal to be received to be zero in communication using amplitude modulation. <P>COPYRIGHT: (C)2008,JPO&INPIT</p> |
