Patent ID: 6434234
Filing Date: 2002-08-13
Classification: H04M

Abstract:
A process for improving the echo suppression in a telecommunications system in which an exchange of information takes place between a local subscriber (X) and a subscriber (Y) at the remote end of a transmission link, and at least one subscriber (X, Y) is assigned an echo suppressor (5), the parameters of which are set via a control circuit (6) as a function of an echo coupling factor (CF) and an echo delay time (i), characterised in that during the exchange of information between the subscribers (X, Y) the time segments for the calculation of the echo coupling factor (CF) and the echo delay time (i) are determined in such manner that from the signal (x(t)) transmitted by a subscriber and from the signal (y(t)) received by a subscriber the positions of the extreme values of the time functions of the transmitted signal and received signal (x(t);y(t)) are in each case determined and marked with a pulse, so that pulse sequences (x(kj);y(kj)) are formed which are stored and compared with one another, and that in the event that the pulse sequences (x(kj);y(kj)) correspond to one another, the received signal (y(t)) originates from the transmitted signal (x(t)) and thus is recognised as an echo, and that then the echo coupling factor (CF) and the echo delay time (i) are calculated.