| 摘要 |
<p>PURPOSE: To inform a coming person of an indicative message etc., exactly by installing a detection circuit mechanism which causes a sound player to be driven and start broadcasting and a timing circuit which sends the signal for suspending it at a preset point of time. CONSTITUTION: The detection circuit mechanism 14 is connected to a timing circuit or a timer circuit 18 in both of the incoming and outgoing directions through lines 16, 20, and also to a tape or the record player 26 through lines 22, 24 to send a starting signal to the player 26 in response to the signal from the starting source 10 and to send a signal to the speaker 30 through an audio output line 28 for broadcasting a record or a tape. And after a desired length of time is elapsed from the finish of the message, the broadcasting is made to stop by a signal sent to the detection circuit mechanism 14 through the line 20 and a signal sent to the tape or the record player 26 through the line 22. By this, messages of more than one once are transmitted one by one at each point of time when required.</p> |
