Maxim Integrated Products, Inc.

Austria Mikro Systeme International Aktiengesellschaft

Austriamicrosystems Ag

Marquardt Gmbh

Gerhard Schultes

Dietmar Weisser

Thomas Gigl

Peter Kreuzgruber

Johannes Mattes

Wolfgang Stehle

Christoph Tomschitz

Christian L&ouml;w

Uwe Hipp

Juergen Keller

Weisser Dietmar

Presented are methods and devices for issuing an authorization for access to a secured area, particularly a building, a room, a vehicle, a computer system or the like, or for starting a machine, a vehicle, a computer or the like, having a monitoring unit comprising a transmitter, a receiver, and an evaluation device, and having a key, a key card or similar, referred to as a key in short below, having a transmitter, a receiver and an electronic device. A permissible position and/or a permissible distance between the transmitter of the monitoring unit and a permissible key is determined prior to issuing an authorization, wherein the transmitter of the monitoring unit transmits signals and the key transmits response signals back to the monitoring unit. The permissible position and/or the permissible distance of the key are determined from the signals received by the key, wherein a signal strength of said signals is evaluated in various directions and/or angles.

Method and device for issuing an access authorization

In a method for the measurement and analysis of tire air pressure with an allocation of wheel positions (I, II, III, IV) of a vehicle () for analysis in a tire air pressure measurement system each wheel () of the vehicle () is allocated an air pressure checking device (), an LF receiver (), in particular a magnetic field strength receiver, an analysis unit (), an RF-transmission device () and an individual wheel code. The LF receiver () receives electrical LF signals from an LF transmission device () of a central unit () arranged in the vehicle (), the analysis unit () analyzes the received signal amplitudes and from these determines a wheel rotation rate and the RF transmission device () of the wheel () sends RF signals with information about the wheel rotation rate and the individual wheel code to the central unit () of the vehicle (). The central unit () determines the wheel position (I, II, III oder IV) of the wheel () using another measurement system () and allocates the air pressure checking device () and its individual wheel code to the known wheel position (I, II, III or IV) on the vehicle (). A tire air pressure measurement system has a central unit () arranged in a vehicle () with an LF transmission device (), an RF receiver device () and a central analysis device (). An air pressure checking device () arranged on each wheel () of the vehicle (), an LF receiver device (), RF transmission device () and analysis unit () for determining a rotation rate using a periodically varying amplitude of the received LF signal, and a measurement system () for measuring the wheel rotation rate at each wheel () and/or for determining the type of bend are additionally provided.

Method for the measurement and analysis of tyre air pressure with allocation of wheel positions and system for tyre air pressure measurement

The invention relates to a security device with sensors for checking whether the security device () is in an undamaged state and checking for the presence of a specified support () of the security device (), said support () being an object, in particular a mechanical or electronic component, characterized in that the sensors detect movements and/or accelerations of the security device () relative to the support () and/or material properties of the support () and/or of the security device () and are connected to an electronic system () for signal evaluation. In a method for using such a security device () the state of the security device () and the presence of a specified support () are ascertained multiple times and in different ways, wherein signals are used which are obtained as actual values and which are compared with specified target values in an electronic system (). An action is triggered upon a deviation of at least one of the actual values from the target values.

Safety device and method for using a safety device

In a method for the unidirectional and interference-safe transmission of digital data via radio waves, wherein the data which are composed of data packets each comprising a defined number of bytes and of at least one synchronization packet are transmitted from a transmitter to a receiver, it is proceeded such that each byte is transmitted in a manner comprised of flag bits as start bits, information-representing information bits and identification bits encoding the number of the respective byte and carrying the parity information and that the flag bits and the information bits are inverted in every second byte.

Method, apparatus and protocol for the unidirectional and interference-safe transmission of digital data via radio waves

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Unterpremstätten, Austria

Gerhard Schultes