Abstract:
A main side of the device (10) has a keyboard with keys (4A, 5A, 4C) and a display (6). According to the invention, part of the keyboard (4) can be moved between two operational positions for which the device retains the same size: a first position called reduced keyboard (and large display) (FIGS. 1C, 1D) and a second position with an extended keyboard (and a small display) (FIGS. 1A, 1B). The keys that are accessible for one position are inaccessible for another position and vice versa.
Abstract:
The invention relates to a motor having a cuboid piezoelectric element (1) which carries an actuating member (2) for transmitting a force in an actuating direction (x). In known motors the piezoelectric element (1) is restrained by four restraining elements which are disposed in the plane of vibration (x/y plane) and which exert a preloading force on the piezoelectric element (1) in a direction perpendicular to the actuating direction (x). However, this gives rise to a frictional force between the restraining elements and the piezoelectric element, which reduces the vibration quality and, as a consequence, the motor power. This is avoided by means of the invention, where the piezoelectric element (1) is restrained by means of restraining elements (20, 21, 22, 23) without preloading, i.e. with maximal slidability in the directions (y, z) perpendicular to the actuating direction (x). Preferably, such a motor is used in drive apparatuses, particularly for driving the read/write unit on a pivotable arm or on a translatable slide.
Abstract:
A semiconductor device with a tunnel diode (23) is particularly suitable for various applications. Such a device comprises two mutually adjoining semiconductor regions (2, 3) of opposed conductivity types and having doping concentrations which are so high that breakdown between them leads to conduction by means of tunnelling. A disadvantage of the known device is that the current-voltage characteristic is not yet steep enough for some applications. In a device according to the invention, the portions (2A, 3A) of the semiconductor regions (2, 3) adjoining the junction (23) comprise a mixed crystal of silicon and germanium. It is surprisingly found that the doping concentration of both phosphorus and boron are substantially increased, given the same amount of dopants being offered as during the formation of the remainder of the regions (2, 3). The tunnelling efficiency is substantially improved as a result of this, and also because of the reduced bandgap of said portions (2A, 3A), and the device according to the invention has a much steeper current-voltage characteristic both in the forward and in the reverse direction. This opens perspectives for inter alia an attractive application where the tunnelling pn junction (23) is used as a transition between two conventional diodes, for example pn or pin diodes, which are used one stacked on the other and which can be formed in a single epitaxial growing process thanks to the invention. The portions (2A, 3A) adjoining the tunnelling junction (22) are preferably 5 to 30 nm thick and comprise between 10 and 50 at % germanium. The doping concentration may be 6null1019 or even more than 1020 at/cm3. The invention further relates to a simple method of manufacturing a device according to the invention. This is preferably done at a temperature of between 550null C. and 800null C.
Abstract:
In an electroacoustic transducer (1) having a magnet system (7) and having a moving coil (15), which is disposed in the air gap (14) of the magnet system (7), and having a diaphragm (17) attached to the moving coil (15) the diaphragm (17) has a mounting zone (24) for mounting the moving coil (15), the diaphragm (17) having projections (25) in the mounting zone (24) and the diaphragm (17) having an interspace between every two projections (25), two stabilizing walls (32, 33), which are inclined with respect to the diaphragm axis (18), are arranged each interspace and are arranged so as to form a roof shape and are formed so as to project beyond the mounting zone (24) in radial directions.
Abstract:
A digital video recorder or similar apparatus implements a method of converting an input data stream having an MPEG-2 Transport Stream (TS) format into an output data stream having an MPEG-2 Program Stream (PS) format. The input data stream (TS) includes data of at least first and second elementary data streams (404, 406) formed and multiplexed in compliance with a TS decoder model. The first elementary stream is a video stream, while the second stream is an audio stream of lower data rate. The input stream is parsed (402) and the elementary streams are demultiplexed into respective FIFO queues 404/406. Each stream is further parsed to obtain and calculate time stamp information which is queued separately at (408/410) with pointers to the stream data (at 404/406). The schedule and packetisation applied to the elementary streams in the input stream (TS) cannot be applied directly in creating the output stream (PS). However, based on parameters and constraints imposed upon the input stream by the MPEG or other specifications, a remultiplexer 412 is able to reschedule and repacketise the elementary data streams into a valid output stream (TS), without the size of buffer that would be required for multiplexing of the elementary streams from scratch.
Abstract:
A data processing system comprises a cluster of devices (16) interconnected for the communication of data in streams, particularly digital audio and/or video data. One of the devices (10) is a source device for at least two data streams to be sent to one or more other devices (12, 14) as destination devices of the cluster. To enable synchronisation of the stream presentations by the destination devices, the source device (10) includes buffers (20, 22) arranged to apply a respective delay to at least one of the data streams, followed by a multiplexer (32) arranged to combine the streams into a single data stream for transmission via a first data channel (18) linking said source (10) and destination (12, 14) devices. The source device may include data processing means (34, 36) interposed in the signal path between the buffers and multiplexer.
Abstract:
An active matrix electroluminescent display device (2) comprises an array of display pixels (4) arranged in rows (6) and columns (8). Each pixel (4) comprises a current-driven electroluminescent display element (10). Each row (6) of pixels (4) shares a common line (20), currents through the display elements (10) of a row (6) of pixels passing along the common line (20). The width of each common line (20) tapers from one end (20a) to the other (20b), the common line (20) being coupled to row driver circuitry at the wider end (20a). The resistance of the common lines is thus reduced at the end of the common line near to the row driver circuitry, where the current flowing is derived from all pixels within the row. The invention thereby reduces voltage drops along the common line, which contribute to cross-talk between pixels within a row.
Abstract:
A mobile unit (1) is disclosed for use with a cellular radio transmission system in the form of a plurality of base stations (BS1 to 7) adapted for two-way radio communication and situated at respective geographical locations to define a corresponding plurality of overlapping service areas (SA1 to 7) constituting one or more regions. The mobile unit comprises a receiver (5), control means (2) for controlling the mobile unit and a user interface (6, 9, 10) wherein the control means is adapted whereby, in use and having pre-programmed the control means with information identifying a predetermined service area, the control means recognizes entry of the mobile unit into that service area from an adjacent service area and notifies a user of the mobile unit of said entry via the user interface. The mobile unit may further comprising a transmitter (5) and be adapted to communicate by two-way radio with the base stations. The user may be notified with an audible, visible or mechanical alarm by the user interface.
Abstract:
A broadcast enhancement system and method for enhancing a received television broadcast signal using a received enhancement signal, at least one of which is prepared for chroma keying. The system is configured to intercept the television broadcast signal before it is passed to the television and to apply chroma keying to superimpose the enhancement signal to the television broadcast signal before passing the superimposed signal to the television.
Abstract:
A method of manufacturing an active matrix device (10) comprising a row and column array of active elements wherein each element comprises a transparent pixel electrode (12) associated with a self-aligned, top gate transistor (14, R2) having a transparent gate electrode (26). The method comprising the steps of forming opaque source (22) and drain (22null) electrodes on a transparent substrate (51); forming a semiconductor channel layer (23) so as to join source (22) and drain (22null) electrodes; forming a gate insulating (24, 25) layer; and depositing a transparent conductive layer and forming both the transparent gate electrode (26) and the pixel electrode (32) therefrom. The transparent gate electrode (26) may be formed by depositing a layer of negative resist (52) over the transparent conductive layer, exposing the layer of negative resist through the substrate such that regions of the negative resist shadowed by the opaque electrodes (22, 22null) remain unexposed, removing the unexposed negative and, having masked the region (53) associated with the transparent pixel electrode (32), removing the exposed transparent conductive layer.