Abstract: A system for structure-borne sound communication within the system. The system includes a first electronic device and a second electronic device, wherein the first electronic device includes at least a first processing unit and a first structure-borne sound actuator, wherein the first processing unit is configured to emit a first structure-borne sound signal by means of the first structure-borne sound actuator, and wherein the second electronic device includes at least a second processing unit and a second structure-borne sound sensor, wherein the second processing unit is configured to detect a structure-borne sound signal by means of the second structure-borne sound sensor and, depending on the detected structure-borne sound signal, to determine whether a mechanical connection is present between the first electronic device and the second electronic device.

Abstract: A method for controlling data glasses. The method includes a step of reading a sensor signal of a sensor unit arranged on the data glasses, wherein the sensor signal represents a change of position of the data glasses in relation to a defined reference point and additionally or alternatively represents a movement of the data glasses. The method also includes a step of applying a function rule for controlling a function of the data glasses by using the sensor signal.

Abstract: A device for ascertaining the orientation of a drill relative to a plane, the device being capable of being connected to the drill, the device having a laser distance measuring unit by which, from a prespecified position relative to the plane, a first distance to a first point in the plane and a second distance to a second point in the plane can be measured, and having an evaluation unit that is configured such that on the basis of the first distance and the second distance the orientation of the device relative to the plane can be ascertained.

Abstract: A device for ascertaining the orientation of a drill relative to a plane, the device being capable of being connected to the drill, the device having a laser distance measuring unit by which, from a prespecified position relative to the plane, a first distance to a first point in the plane and a second distance to a second point in the plane can be measured, and having an evaluation unit that is configured such that on the basis of the first distance and the second distance the orientation of the device relative to the plane can be ascertained.

Abstract: A method for operating a gas-discharge lamp (10) of a motor-vehicle headlamp comprises steps of operating the gas-discharge lamp (10) in a first operating mode at a comparatively higher power and alternating-current voltage and in a second operating mode in a temporally limiting manner at a comparatively lower power and direct-current voltage. When a switch is made from the first operating mode to the second operating mode, a polarity of the direct-current voltage is predefined depending on the respective polarities of the direct-current voltage in at least one previous operating phase of the second operating mode. A device or unit operates the gas-discharge lamp and controls a sequence of the method.