The invention relates to a duplex transmission system, wherein an echo compensation signal (yec(kt)) is generated which is combined with a receive signal (u(t)) to prevent crosstalk from the own transmitter to the receiver. Before feeding the receive signal to the echo compensation device (6, 7), the receive signal is initially scanned with the double symbol rate, equalized and subsequently scanned once again with the simple symbol rate so that only one compensation value per receive signal has to be generated by the echo compensation device (6, 7).