Active equalization circuit

摘要

The active equalization circuit utilizes an electronic potentiometer inserted between the output of an addition amplifier and the input of the equalization structure, wherein the controlled output signal of the potentiometer is supplied to the addition input of the addition amplifier via the series circuit of an impedance transformer and of an impedance. A control network with at least one current controlled circuit functions as the electronic potentiometer. This current controlled circuit being inserted between the input of the impedance transformer and the output of the addition amplifier, and/or between the input of the impedance transformer and the input connection of the equalization structure. The active equalization circuit can be advantageously inserted in a hybrid arrangement between the output of a hybrid circuit connected to a two-wire line and the input of an echo compensator, where the echo compensator is controlled via a control circuit by the output signal of the echo compensator.