RADIO COMMUNICATION SYSTEM

摘要

PROBLEM TO BE SOLVED: To improve security by informing the presence of signals for which control signals from a remote controller are illegally copied in a remote control system. SOLUTION: A transmitter includes a communication number N1 for counting the number of times of transmission in a transmission counter means in transmission signals and transmits them, and a receiver compares the communication number N1 of this time present in the received transmission signals with the communication number N2 of a previous time stored in a communication number storage means 36 in a comparison means 37. A transmission means performs the maximum of Np times of retransmission when no response signal is present from the receiver and the comparison means 37 outputs information signals at the time of not satisfying N2