| 摘要 |
PURPOSE:To expand a subscriber capacity and to prevent mis-reception by dividing a subscriber receiver into plural large groups each comprising plural subgroups and receiving a signal in only a relational frame reception timing of a synchronizing code of a specific pattern. CONSTITUTION:When a call number of a receiver belonging to a large group A from a specific pushbutton telephone set 1 to a transmitter 4 via a telephone line 2, a control section 7 collates a signal at a subscriber memory 8 and it is confirmed and the state of transmission is informed to a caller and a control signal is sent to a call number register 10 and a transmission signal processing section 17 belonging to the group A. The processing section 13 encodes the number and applies radio signal conversion to the timing of the relevant frame and the result is sent. An antenna 20 of the receiver receives a call number sent in the assigned frame timing and detects the coincidence of the number, the signal is sent to a control section 35 and a speaker drive circuit 37 to drive a speaker 38, from which the signal is sounded. |
