| 摘要 |
PURPOSE:To reduce remarkably crosstalk at calling by using information from an external switch to detect an idle talking channel in excess of a preset time and storing the number of the idle channel. CONSTITUTION:When a switch 14 is turned off and a call request comes conventionally, the system enters the calling operation and when a control signal is received, a control signal is set and the system enters the acquisition mode. When the switch 14 is turned on, a talking channel selected at random is set and when a received input voltage exceeds a threshold value, the random talking channel selection is restored and when an insensible state is consecutive for, e.g., >=5sec, an IDL (idle) display is put on a display device and the channel code of the talking channel is stored. When a call request exists and no control signal is received, after 5sec elapses in the control channel, the stored talking channel is set. |
