| 摘要 |
The invention is related to a circuit arrangement for centrally supplied subscriber stations in telecommunication installations. In the inventive circuit the recieving amplifier is connected into a bridge circuit used for side-tone attenuation. The signal input of the receiving amplifier is located in the one diagonal of the bridge, and the output of the transmitter is located in the other diagonal of the bridge circuit. A variable resistance element is connected in parallel with the bridge diagonal across which the signal input to the receiving amplifier appears for compensating for the different attenuation affects of transmission lines having differing lengths. |
