Abstract: The invention relates to a method and device for optical data transmission, in particular a method for transmission of data by means of digitised infrared signals. Data sequences are transmitted using a time-division multiplex access protocol with communication frames comprising single sequential windows with a given minimal bit transmission rate. At least one control impulse sequence is provided in each communication frame. According to the invention, the control impulse sequence is transmitted at a bit transmission rate which is lower than the minimum bit Transmission rate for the data sequence.

Abstract: An infrared (IR) receiving device (1) with IR detector elements (3) for receiving IR signals from a communication zone (5), as well as with a processing circuit for deriving electric signals corresponding to the IR signals received, wherein the IR detector elements (3) are provided in at least one matrix-type arrangement (2) which corresponds to a matrix-type segmentation of the communication zone (5), and the processing circuit comprises a maximum detector circuit (9) connected to the IR detector elements (3), which maximum detector circuit (9) selects one respective maximum output signal from among the output signals of the IR detector elements (3) for deriving the electric signal.

Abstract: A wireless, in particular mobile, communication device (8) for communicating with communication units (9) in vehicles (5, 6, 7), comprising a transmitter (26) and a receiver (29) for information-containing electromagnetic waves, as well as a control unit (25) for controlling the transmitter (26), a directional characteristic (10, 10?) being provided for the receiver (29) and/or for the transmitter (26), for a selective communication with communication units (9) in vehicles (5, 6, 7) at distances (D) of more than 10 m, preferably in the order of from 20 m to 200 m, e.g. in the order of approximately 100 m, in particular with a receiving angle, or a radiation angle, respectively, of from 0.5° to 4°, preferably 0.8° to 2.5°, and a sighting unit (13) as well as an indication unit (16, 18) being provided, the indication unit being connected with the receiver (29) via a processing unit.

Abstract: An in-vehicle transponder communicates with roadside readers to transmit a data stream of information that has been previously presented to the transponder. The transponder accepts multiple data cards and the identification numbers of the vehicle occupants for transmission to roadside transceivers.

Abstract: An infrared (IR) receiving device (1) with IR detector elements (3) for receiving IR signals from a communication zone (5), as well as with a processing circuit for deriving electric signals corresponding to the IR signals received, wherein the IR detector elements (3) are provided in at least one matrix-type arrangement (2) which corresponds to a matrix-type segmentation of the communication zone (5), and the processing circuit comprises a maximum detector circuit (9) connected to the IR detector elements (3), which maximum detector circuit (9) selects one respective maximum output signal from among the output signals of the IR detector elements (3) for deriving the electric signal.

Abstract: A system for automatically charging fees when predetermined positions are passed, comprising a communication device (4) for dedicated short range communication (DSRC) that is intended for an at least temporarily stationary installation, and at least one mobile communication unit (7) for dedicated short range communication (DSRC); the DSRC communication device (4) provided to be stationarily installed is adapted for transmitting information identifying itself and thus, at least indirectly, its position of installation to the mobile DSRC communication unit (7).

Abstract: The invention relates to a method and device for optical data transmission, in particular a method for transmission of data by means of digitised infrared signals. Data sequences are transmitted using a time-division multiplex access protocol with communication frames comprising single sequential windows with a given minimal bit transmission rate. At least one control impulse sequence is provided in each communication frame. According to the invention, the control impulse sequence is transmitted at a bit transmission rate which is lower than the minimum bit transmission rate for the data sequence.

Abstract: An infrared (IR) transmission device comprising IR transmitter and receiver elements arranged in a housing, wherein a common, multi-segment lens element (29, 29A, 29B) is arranged ahead of the IR elements (22, 32), and each IR element (22, 32) has an associated lens segment (32, 33) of the lens element (29, 29A, 29B).

Abstract: A wireless, in particular mobile, communication device (8) for communicating with communication units (9) in vehicles (5, 6, 7), comprising a transmitter (26) and a receiver (29) for information-containing electromagnetic waves, as well as a control unit (25) for controlling the transmitter (26), a directional characteristic (10, 10′) being provided for the receiver (29) and/or for the transmitter (26), for a selective communication with communication units (9) in vehicles (5, 6, 7) at distances (D) of more than 10 m, preferably in the order of from 20 m to 200 m, e.g. in the order of approximately 100 m, in particular with a receiving angle, or a radiation angle, respectively, of from 0.5° to 4°, preferably 0.8° to 2.5°, and a sighting unit (13) as well as an indication unit (16, 18) being provided, the indication unit being connected with the receiver (29) via a processing unit.

Abstract: A wake-up circuit for an electronic device comprises an input circuit (1) for receiving infrared signals and an amplifier (2) connected to the input circuit (1), the output of the amplifier being connected to a switching circuit (6) for switching on the device. To improve the signal/noise ratio it is provided that the input circuit (1) includes a parallel arrangement of at least two series arrangements of infrared detectors (7 to 10) as well as a parallel resonant circuit (11), and that the amplifier is a bandpass amplifier (2) the output of which is connected to a signal detector to which the switching circuit (6) is connected.

Abstract: A data receiver circuit for infrared signals, in particular for toll systems on roads, comprises several infrared detectors (5) the signals of which are supplied to a summing circuit so as to increase the useful power while suppressing interfering signals. To improve the signal/noise ratio, it is provided that several input circuits are provided with an infrared detector (5a, 5b to 5n) each and with an associated separate amplifier (6a, 6b to 6n), and that these input circuits are connected in parallel to the summing circuit (7).

Abstract: A structural element for use as a carrier body in a catalytic process, condenser body or filter is formed by unwinding a foil from a roll, forming staggered cuts in the foil, and stretching the foil transversely to convert the cuts into hexagonal apertures interconnected by webs which become twisted to provide the sheet with a depth dimension. The sheet can be cut to length and layered with other like sheets in a flat or rolled form.