| 摘要 |
PURPOSE:To prevent intervention or interference by inhibiting a self-calling when the fact that a carrier to be used by oneself and the carrier of the same frequency are already being emitted in a cordless telephone set is detected. CONSTITUTION:Even when a fixed equipment A' does not send a carrier to a mobile telephone B', a carrie voltage detecting circuit 15 detects the receiving level of an acting receiving circuit 3. '1' or '0' is outputted corresponding to the existence of the level more than a fixed value. When the '1' is continued for a fixed set time, a busy deciding circuit 16 decides it as a busy condition, and the transmission of a transmission circuit 2 is inhibited. This action is executed in the same way in the mobile telephone B' side. Thus, since a calling is controlled, the interference or the intervention can be prevented. Moreover, when the busy decision after detecting the carrier is weighted, the decision with high accuracy can be realized at high speed. |
