VERFAHREN ZUM ERMITTELN DER UEBERTRAGUNGSEIGENSCHAFTEN EINES ELEKTRISCHEN SYSTEMS

摘要

The invention relates to a process for finding the transmission properties (H(jf)) of an electric line (2) in an ISDN system in which a test signal (m(t)) is applied to one end of the line (2) and at the other end the reception signal (g(t)) produced by the test signal (m(t)) is evaluated. In order to be able to conduct such a process with a test signal with a crest factor of one with relatively little cost, the test signal used is a binary, bipolar random numerical sequence signal (m(t)) with the crest factor one and the reception signal (g(t)) is scanned at time intervals corresponding to the period of the test signal (m(t)) and subjected to a Fourier transformation to provide a spectrum signal (G(jf)); the latter is complexly multiplied by a reference spectrum Mi(jf) to provide an output signal (H(jf)) which provides a measure for the transmission properties of the line (31).