| 摘要 |
PURPOSE:To attain the increase in the number of receivers to be distinguished by using two factors or over in combination among address signal, zone, time and frequency being factors to distinguish a receiver. CONSTITUTION:A base station sends an address signal of a receiver to be called from a coder 1 and it is sent to the receiver via a transmission section 2 and an antenna 3. On the other hand, the address signal is received by an antenna 4 and a reception section 5 in the receiver and the received address signal is outputted to a decoder 6. Only when the preset value to the receiver and the reception signal are coincident, the reception display is applied. In this case, the use of the same address signal is allowed to the base station where the radio wave arrival zone is not overlapped and each receiver is distinguished by an address signal set individually in the signal sent from the base station. |
