Patent ID: 7956701

Claim:
A method for a contactless transmission of at least one differential signal between a transmitter and a receiver given the existence of at least one common-mode noise signal, the method comprising: separating a ground reference potential assigned to the receiver into two ground reference potentials decoupled from one another, and suppressing the at least one common-mode noise signal by a filter unit at an input of a receive amplifier of the receiver, attenuating, using a passive-filter unit, the at least one common-mode noise signal in a coupler for decoupling at least one signal from the transmitter at the receiver at least essentially to the same extent as a signal of the same frequency to be transmitted, and/or capacitively coupling a ground reference potential relating to a part of the receiver including the receive amplifier to a ground reference potential of the transmitter, wherein separating the ground reference potential includes modulating an analog signal, encoding a digital signal or modulating the analog signal and encoding the digital signal, and wherein an optoelectrical converter and an optical waveguide are used to separate the ground reference potential.