| 摘要 |
PURPOSE:To eliminate the second supply of the line signal to an interrupting circuit and to compensate the level fluctuation of a transmitting circuit, by synthesizing the interrupting signal and the line monitor signal given from a basic circuit after switching them to a processing circuit and the transmitting the synthetic signal to the basic circuit. CONSTITUTION:A switch circuit 5' is connected between the basic circuits 2. In this connection, a series resonance circuit consisting of a coil L1 and a capacitor C1 is connected in parallel to a parallel resonance circuit comprising relay contacts rl1-1 and rl1-2, a coil L2 and a capacitor C2, and furthermore an interrupting circuit 8 is connected to one end of the contact rl1-2. When the signal sent from the circuit 2 is selected, the contact rl1-1 is at the position shown by a solid line and then connected so that the signal of the circuit 2 is transmitted to a repeater through the point (a), the contact rl1-1 and the point (c). Then in case the interrupting signal of the circuit 8 is selected, the contact rl1-1 and rl1-2 function as shown by the dotted lines. Thus the undesired wave component is eliminated by a parallel resonance circuit, and the interrupting signal is sent to the point (c). The interrupting signal is synthesized with the line monitor signal at the point (c) and transmitted to the next repeater. |
