| 摘要 |
PURPOSE:To minimize the number of parts and to conveniently control to send an audible sound by being equipped with a control device to switch a switching device at the interval set beforehand and executing the processing with only one switching device. CONSTITUTION:When an audible sound is sent to a telephone set 7, a CPU 4 controls a control terminal C2 of a switch 2, and thus, at first, connection is switched from a breaking terminal Y1 to a making terminal Y0 and the audible sound is sent from an output terminal Y to a telephone set 7 for a prescribed time. After the sound is sent for the prescribed time, the connection is switched from the making terminal Y0 to the breaking terminal Y1 and the sending of the audible sound is stopped for the prescribed time. Further, when the transmittable condition is not obtained, the connection is switched from the terminal Y1 to the making terminal Y0 again, the switching action is repeated at the interval set beforehand, and thus, the audible sound is sent intermittently. In that case, the identification of the dial tone, busy tone and ringing tone can be executed.
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