| 摘要 |
Interface circuit for telephone exchange installations for the d.c. decoupling of two line sections, especially to convert symmetrical to asymmetrical voltage conduction. The ends of these two line sections are connected at the interface to the output of a controllable current (14) or voltage source, said sources being controlled dependently upon the current or voltage at the other side of the interface circuit or upon the differences between the currents or voltages on both sides in such a way that the currents (J1, J2) and voltages (V1, V2) on one side are the same as those on the other side or are in a predetermined mutual relationship. It is thus possible to provide impedance-transparent interface circuits without repeater. |
