| 摘要 |
<P>PROBLEM TO BE SOLVED: To solve the problem wherein information indicated by a serial signal on a transmission path 3 is leaked to a third party, if the serial signal is monitored by the third party, because the serial signal is not particularly encrypted, although a serial signal generated by a transmission IC1 can be transmitted to a receiving IC2, and to solve another problem that a high frequency component of the serial signal adversely affects other circuits in the IC, depending on the frequency bands of the serial signal. <P>SOLUTION: A transmission signal is spread and modulated, using a spread code generated by a code generator 34, and the spread and modulated transmission signal is transmitted. <P>COPYRIGHT: (C)2004,JPO |
