| 摘要 |
PROBLEM TO BE SOLVED: To improve the security and to reduce the cost of a communication system by transmitting the information at one or more data speeds by means of a modulation back scatter technique. SOLUTION: An application processor 101 communicates with the question units 103 and 104 via a LAN(local area network) 102. Every question unit communicates with one or plural tags 105 to 107. A receiving modulation radio signal modulator can recover a 1st information signal, and a 1st decision element supplies the output to designate at least the selected one of two alternate actions A and B in response to the 1st information signal. A 2nd information signal is produced in response to the output of the 1st decision element and has a data speed which is increased in the action A compared with the action B. Then the reflection of a receiving modulation radio signal is modulated by means of the 2nd information signal. |
