Abstract: An electrical hand-held device is provided with improved proximity detection, which can be placed on a surface and has at least one transmission electrode, at least one reception electrode and at least one compensation electrode arranged between transmission electrode and reception electrode. The transmission electrode and the compensation electrode can be supplied with an electric switching signal of predetermined signal frequency and predetermined signal amplitude. Switching electric signal at the compensation electrode is phase-delayed with respect to the switching electric signal at the transmission electrode. Alternating electric fields radiated at the transmission electrode and the compensation electrode generate a current in the reception electrode, which is representative of an approach of a hand to the hand-held device.

Abstract: A sensor device is provided, with a first electrode structure and a second electrode structure, wherein the first electrode structure has a transmitting electrode, a compensation electrode and a reception electrode and wherein the second electrode structure has a number of field sensing electrodes. The first and the second electrode structure are coupled with an evaluating device. The evaluating device has a signal generator for supplying the transmitting electrode and the compensation electrode with an alternating electrical signal. The reception electrode, the transmitting electrode, the compensation electrode and the field sensing electrodes are arranged in relation to each other in such a way that a first alternating electrical field emitted at the transmitting electrode may be coupled into the reception electrode and into one of the field sensing electrodes and a second alternating electrical field emitted at the compensation electrode may be coupled substantially only into the reception electrode.

Abstract: A device for an electric hand-held device for detecting the hand-held device being clasped by a hand, has at least one transmitting electrode, which can emit an alternating electric field, and at least one receiving electrode, in which the alternating electric field can be coupled at least partially, wherein the at least one transmitting electrode and the at least one receiving electrode can be arranged on the hand-held device such that each of them is at least partially covered by the hand when the hand-held device is being clasped by the hand. When the hand-held device is being clasped by the hand, a first portion of the alternating electric field emitted by the transmitting electrode can be coupled via the hand into the receiving electrode, wherein at least the first portion of the alternating electric field is a characteristic representative of the hand-held device being clasped by the hand.

Abstract: The present invention provides a headphone apparatus and a headphone driving apparatus thereof The headphone driving apparatus includes a first and second driving circuits, a signal transmitting circuit, a first and second reference signal generators. The first driving circuit receives a first audio signal pair and generates a first driving signal. The second driving circuit receives a second audio signal pair and generates a second driving signal. The signal transmitting circuit transmits the first audio signal pairs or the reference signal to the first output end pair. The signal transmitting circuit decides to transmit the second audio signal pairs to the second output end pair or not according to the mode selecting signal. The second reference signal generator receives signals and generates the second reference signal. Wherein, the first and second reference signal generators are turned off according to the mode selecting signal.

Abstract: An electronic circuit with a plurality of connections for a plurality of sensor elements is provided, wherein the electronic circuit is configured to detect, with at least one multiplexing method, the presence of an object in at least one observation area of the sensor elements and to distinguish between the sensor elements. Also a method for determining the position of at least one object situated in at least one observation area of sensor elements relative to the sensor elements is provided, whereby with a multiplexing method an electric variable for each sensor element is detected, which is indicative for the presence of the object in the respective observation area.

Abstract: A sensor electrode (SE) for a capacitive sensor device is designed such that the width of the sensor electrode decreases towards the center such that the capacity between the sensor electrode and an object (F) with constant distance between the sensor electrode and the object (F) substantially is equal in size for each position of the object (F) relative to the sensor electrode along a longitudinal axis of the sensor electrode. The sensor electrode may consist of a plurality of segments arranged in a strip with decreasing width towards the center of the electrode.