Automatic adaptor control network - matches four-wire circuits having phase and amplitude adjustment modules with counters and detectors

The automatically adapting control network is for matching terminated four wire circuits in telephone subscriber equipment. The input of the four wire circuit (GS) is supplied via a two wire line (VL) through a coupling network. The automatic matching network contains a phase angle adjustment module (PSG) and an amplitude adjustment module (ASG). The phase angle and the amplitude modules each contains its own counting stage. The counters are supplied with a common setting pulse from a signal detector (SID). The output from a transmission voltage threshold switch and that from a receiving voltage threshold switch are fed to the respective stores.