Patent ID: 8019286

Claim:
A method for determining an amplitude and/or the phase of an output signal of a transmission link dependent upon the amplitude of an input signal, comprising: applying a test signal (s(t)) to the transmission link; determining a response signal (e(t)) resulting from amplitude and/or phase distortion in the transmission link; determining the amplitude and/or the phase of the output signal of the transmission link from the amplitude response (|e(t)|) of the response signal (e(t)) and/or of the phase responses (φ s (t), φ E (t)) of the test signal (s(t)) and of the response signal (e(t)) dependent upon the amplitude (|s(t)|) of the test signal (s(t)), wherein the amplitude response (|s(t)|) of the test signal (s(t)) consists of several first and second response segments ( 1 i , 2 i ) with constant amplitude values (|s 1i |, |s 2i |) over the duration (ΔT) of the respective first or second response segment ( 1 i , 2 i ), the amplitude response (|s(t)|) of the test signal (s(t)) providing in an alternating manner first response segments ( 1 i ) with amplitude values (|s 1i |) changed relative to one another and second response segments ( 2 i ) with amplitude values (|s 2i |) unchanged relative to one another; wherein the amplitude values (|s 1i |) of successive first response segments of the test signal (s(t)) diminish and the amplitude values (|s 2i |) of the second response segments ( 2 i ) of the test signal (s(t)) correspond to the largest amplitude value (|s 1i |) of the first response segments ( 1 i ) of the test signal (s(t)).