Patent ID: 6978013

Claim:
Device for the DC-decoupled connection of a telephone line to a digital signal processing device at the subscriber end of the telephone line, comprising a first circuit, which is connected to the telephone line; a transformer; a second circuit, which is connected to the digital signal processing device; the first circuit exhibiting a hybrid circuit between the transformer and the telephone line for separating the signals of the telephone line in a first signal path which extends from the telephone line to the digital signal processing device, and into a second signal path which extends from the digital signal processing device to the telephone line; the transformer having a first and a second winding; the first winding being connected to the first circuit and the second winding being connected to the second circuit; the first and second winding being DC-coupled from one another; the first and second circuits transmitting the signals of the first and second signal paths transmitting bi-directionally by a ping-pong process decoupled via the transformer for both directions of transmission.