Abstract: A data device (1) for a motor vehicle is proposed which has a database (4), a GPS receiver (3), and a display (2). In the database (4), place data sets with at least the place name and geographical data are stored in memory. The current position of the motor vehicle can be determined by the GPS receiver. A place data set is selected whose name is shown on the display (2). From the current position of the motor vehicle and the geographical data of the data set selected, further data are generated and shown on the display (2).

Abstract: An optical storage medium and a reading device are proposed, wherein the optical storage medium has the format of a credit card.

Abstract: A telematic device in which a car radio with an RDS module, a wireless telephone, and a positioning and navigation system are provided in one housing. The housing is designed so that it can be installed in a standard bay in the instrument panel of a motor vehicle. The telematic device can be used to receive general information via the car radio as well as specific information via the GSM module. In addition, data relating to, for example, the vehicle position, a desired destination, or an emergency call can be sent to the central station. The central station calculates one or more routes and transmits them back to the telematic device. In the event of an accident or a vehicle breakdown, an emergency call is transmitted and assistance obtained. Additional telematic services provided include an expanded anti-theft system for the motor vehicle, hotel reservations, etc.

Abstract: A method of separating and identifying verbal announcements in a wireless transmission according to the GSM standard, in which verbal announcements from the audio stream can be associated with digital signals with the help of an ID number, so that the announcements can be separated.

Abstract: A device of a vehicle for data transmission to a stationary beacon 91), which has a transceiver, comprising an on-board unit (2) with an antenna (6) for receiving a continuous signal (5), broadcast by the beacon (1), and for transmitting the received signal (5) back after modulation with a data signal (i(t)), is characterized in that the signal (7) transmitted back by the on-board unit (2) is a double-sideband signal. In that case, the on-board unit (2) can be designed as extremely simply and in the simplest case comprises a diode (9) connected to the base of the antenna (6).

Abstract: For the digital data communication between a vehicle (transponder) and a beacon, an automatic gain control wherein the path attenuation between the transponder and the brake increases disproportionately with the distance. A two-stage automatic gain control is included for the gain control. After the first amplifier stage, the output signal is measured and supplied, together with a setpoint value contained in a setpoint memory, to a control amplifier. The output signal of the control amplifier is used both for automatically controlling the first amplifier stage, as well as the second amplifier stage. The automatic control makes it possible to cover only one single lane when automatically debiting highway tolls for a motor vehicle, for example. Influences caused by other motor vehicles on a nearby lane are eliminated.

Abstract: A method and a circuit arrangement for combining several data channels with a transmission channel in which the carrier signal has at least two digital data signals, each with a different frequency, superimposed on it in terms of time. The superimposed signal is transmitted and received by a receiving device. The receiving device decodes the digital data signals and can pass them on, separately, to corresponding devices for further processing. The method and circuit arrangement may be advantageously used for data transmission between a motor vehicle and a fixed beacon. The data to be transmitted may contain traffic guidance data, or data for billing road use fees, for example.