| 摘要 |
PURPOSE:To realize a call with no intervention of a man, by providing an automatic dial starting means and a transmission/reception switching means and thus calling out the telephone number decided previously with a simple operation. CONSTITUTION:In an emergency, the push-button 2 provided to the case 1 of an elevator is pushed, and thus the signal detecting part 3 starts. Then the MF signal control circuit 4 controls the MF signal oscillating circuit 5 to transmit the abbreviated dial signal of the pushphone to the trunk lines L1 and L2. Receiving the start signal of the truck line starting circuit 9, the switchboard of the telephone station connects the start signal to the remote number which is stored previously. With an answer of the called subscriber, the relay of the answer detecting circuit 10 operates to actuate the information sound control circuit 11. Thus the information sound is sent to the called subscriber's telephone from the originator information signal generating part 13. With discontinuation of the information sound, the contacts l1 and l2 are closed to secure a call to the called subscriber after formation of a channel. On the other hand, the answer from the called subscriber is detected by the remote signal receiving circuit (e) by producing the switch signal before transmission of the answer. Then the keep relay (d) is inverted to send the aural signal sent from the transformer T2 to the amplifier (g). Thus a voice is generated through the speaker (h). |
