Abstract: A pulse signal multiplier for the provision of a secondary pulse signal without retroactive effect from a primary pulse signal of a pulse signal generator, in particular for the multiplication of speed sensor signals for use in train protection systems, includes an input circuit which taps off the primary pulse signal via a shielded branch signal line, an output circuit which receives the signal transmitted via the potential barrier, and an optical signal transmission path bridging the potential barrier between the input circuit and the output circuit.

Abstract: A potential-separating optical signal transmission device comprises a printed circuit board-based transmitter device with a signal input, a transmission signal conditioning circuit and an optical signal transmitter, a printed circuit board-based receiver device with an optical signal receiver, a received signal processing circuit and a signal output, an optical transmission path between the signal transmitter and the signal receiver, a shield assembly for each transmitter and receiver device, an implementation of the shield assemblies by means of metallic layers in and/or on at least one printed circuit board, and a substantially rigid, transparent transfer rod as an optical transmission path, the ends of said transfer rod being arranged within the respective shield assembly of the transmitter and receiver device in front of the signal transmitter and signal receiver, respectively, and being mechanically held by the at least one printed circuit board.