Abstract: A method of operating a radio communication system uses a random access channel to enable a secondary station to transmit a message to a primary station. The secondary station transmits a preamble to the primary station. After successful receipt of the preamble the primary station transmits a control channel including power control information to instruct the secondary station to adjust the output power of its transmitter. This method ensures that the secondary station transmits at a sufficient power for the message to be received successfully by the primary station, while minimizing interference generated by the transmission.

Abstract: A secondary station has a receiver capable of resolving signals received as a plurality of multipath signals from a plurality of base stations during a soft handover process. This capability may, for example, be provided by a Rake receiver. In order to decode and act upon the received signals in a very short period of time, signals (402g,402h) arriving after a predetermined time are not processed by the receiver which is able instead to process weaker signals (402d,402e) which arrived before the time (t1). Such a secondary station is particularly suitable for decoding and acting upon power control commands included in received signals in a UMTS system, for which a very limited period of time is provided by the UMTS specification. In this application the predetermined time (t1) is the time after which signals are received too late for use in determining the next power control change.

Abstract: The invention relates to a receiver module (1), more particularly a GPS (Global Positioning System) receiver module for receiving PS signals and for determining position data therefrom, as well as a dual band antenna (2) for such a receiver module (1). The dual band antenna (2) has at least a first and a second resonant printed wire structure (11 and 12) which are a first junction point (10) to a first printed wire (24) on a printed circuit board (7). Additionally, at least a second and wire (25 and 29) are provided on the printed circuit board (7) as connections to the antenna. The invention further relates t circuit board (PCB) as well as a mobile telecommunications device having such a dual band antenna.

Abstract: A method of, and receiver for, countering distortions in radio channels due to intersymbol interference (ISI) and other non-linearities in a radio link, comprises a first equalizer (48) using a training sequence for equalizing one type of distortion, say that due to ISI, and a second equalizer (50) coupled to recieve the equalizing output of the first equalizer and using another training sequence for equalizing another type of distortion. The first and second equalizers may be fractionally spaced equalizers.

Abstract: A slave radio transceiver for use in a frequency hopping radio system synchronizes by receiving on a sequence of simultaneous combinations of radio channels until a paging message is received from a master transceiver, and may then revert to single channel frequency hopping operation. The slave's multi-channel receiver is sub-equipped to receive simultaneously on a only sub-set (PF12, PF13) of the channels within its bandwidth, the received channels being selected by independent programming within the bandwidth. The channels received simultaneously may be selected to correspond to different degrees of misalignment between the master and slave.

Abstract: The invention relates to a display device for displaying information comprising a plurality of display elements with an electrophoretic medium, a first electrode (6), a second electrode (6?) and a third electrode (7) associated with each display element for receiving a drive signal, and control means for supplying, in correspondence with the information to be displayed, the drive signal to the electrodes for realizing intermediate optical states. In order to omit reset pulses, which cause a temporary blanking of the display device, the electrophoretic medium of the display device comprises two groups of electrophoretic particles, one group of positively charged electrophoretic particles (14) and one group of negatively charged particles (14?) and the color of the electrophoretic particles of the first group is equal to the color of the electrophoretic particles of the second group.

Abstract: In known converter circuits switching losses occur, which are caused by reverse-recovery currents of a freewheeling diode. To reduce said switching losses it is proposed by the invention to drive the switching elements such that, upon switching from the second to the first switching element, the timing is controlled in such a manner that the shoot through currents and the conduction of the freewheeling diode are kept at a low value or, better still, are precluded. As regards the control mechanism, it is proposed to turn on the first switching element later if shoot through currents occur, and to turn on the first switching element sooner if conduction of the freewheeling diode occurs. Here, a time of overlap may be provided during which both switching elements are simultaneously conducting. For the control mechanism, the voltage across a switching element can be used as a measured input value.

Abstract: A differential amplifier for amplifying an input differential signal having two components (In+, In?) substantially in anti-phase to each other and generating an output differential signal having two differential components (Out+, Out?). The amplifier comprises a pair of inverters coupled to a pair of adders the inverters receiving the input differential signal. The amplifier is characterized in that it further comprises a pair of controllable buffers for receiving the input differential signal and outputting a signal to the pair of adders. A bias of the said pair of buffers is cross-controlled by the input differential signal for controlling an amplification of said pair of controllable buffers.

Abstract: A telephone user who is at a first telephone station and is placed on hold at a second station is prevented from listening to an objectionable audio signal while a call is in process between the user and the second telephone station. The objectionable audio signal is detected while the call is in process and the user is prevented from hearing the objectionable audio signal while the objectionable audio signal is being detected. In response to detection of the end of the objectionable audio signal, the user is coupled to the second telephone station.

Abstract: A substrate (1) having a first groove (4) is provided with a protrusion (3) on the first groove (4). This protrusion (4) preferably has a top with an apex angle of 30 to 150 degrees and results in a controlled breaking of the substrate (1) and a minimum of loss due to deviations of the crack initiated at the protrusion (4).

Abstract: A method for reducing frequency glitches in a digital transceiver due to power amplifier input impedance variations. According to the method, the power amplifier is switched on after the end of a prior packet reception period and before a new packet transmission begins. Instead of ramping the power amplifier gain, the method ramps the modulation signals. As a consequence, any VCO frequency transients that may result from turning on the power amplifier have an opportunity to decay before the new packet transmission is initiated. This technique effectively isolates the transmitter power amplifier from the frequency synthesizer VCO to facilitate fast switching transceiver operation.

Abstract: A digital image enhancing system for processing pixel contour data comprises a contour filter, means for edge processing and for local noise reduction to reduce the amount of noise in a pixel luminance or color signal (Sin), means to apply a control signal (Ghpf) indicating the gain of a contour signal, and means to apply a control signal (Gcntr) indicating the gain of the contour as a function of local noise in a picture. The means for edge processing and local noise reduction are arranged such that an output signal (Sout) is supplied in response to said input signal (Sin), to a low pass filtered input signal (Slpf) derived therefrom, and to the contour filter output signal (contour) and the above control signals according to the relation: Sout=Gcntr*Ghpf(Sin?Slpf)+Slpf if Gcntr*Ghpf<1, and Sout=Sin+(Ghpf*Gcntr?1)*contour else.

Abstract: An apparatus and method for recommending a schedule of events to a user is disclosed. In the preferred embodiment of the system and method, each channel schedule is broken down into time slices. A novel fuzzy-now recommendation-time value is calculated for each time slice. This fuzzy-now recommendation-time value is a two dimensional value measured in units of recommendation-time, or “enjoyment minutes”. By means of the calculated fuzzy-now recommendation-time values, recommended schedules may be generated using a wide variety of selection methods.

Abstract: The invention relates to a switching device comprising programmable compensation means which are associated with the input/output connections for inverting the polarity of the input/output connections when said connections present a polarity inversion which is inherent in the conception of the circuits.

Abstract: The present invention relates to a digital filter suitable for receiving a digital input signal (INPUT(G)) comprising a voltage peak also known as glitch (G). It is characterized in that it comprises: a delay line (T) adapted to produce a delayed digital input signal (INPUT(G)+?t), rising edge (PD) and falling edge (ND) detectors adapted to produce rising (P) and falling (N) edge indicator signals respectively from the delayed digital input signal (INPUT(G)+?t), first (M1) and second (M2) mixing means adapted to produce rising (P?) and falling (N?) edge filter indicator signals respectively from said digital input signal (INPUT(G)) and said rising (P) and falling (N) edge indicator signals respectively, third mixing means (M3) adapted to produce a digital output signal (OUTPUT) without a glitch from the rising edge filter indicator signal (P?) and from the falling edge filter indicator signal (N?).

Abstract: An improved differential inverter comprising a differential inverter having a differential input for receiving a first input signal and a second input signal, said inverter further comprising a differential control input for receiving a first control signal and a second control signal. The improved differential inverter further comprises a differential output for transmitting a first output signal and a second output signal. The improved differential inverter further comprises a controlled bias generator that generates the second vector of input signals in response to a bias control signal. The control bias signal is generated at an output of a voltage divider coupled to the differential output of the differential inverter said bias control signal being indicative for a DC voltage of the of the differential output.

Abstract: The invention relates to a wireless network comprising a radio access network and a plurality of terminals which are each provided for encoding certain data to be transmitted and for forming a key in the same manner in dependence on a first and a second frame number for a connection to be set up or to be reconfigured between the radio access network and a terminal. The first frame number depends on the periodically changing number of the radio frame used for the data transmission and the value of the second frame number depends on the first frame number. Based on the value of the first frame number the terminal and/or the radio access network is provided for ascertaining whether a time delay is to take place in the formation of the second frame number in the radio access network.

Abstract: A signal processing device for a sensor output signal from a sensor covered by a color mask pattern having a plurality of colors, the signal processing device comprising a reconstruction unit (5) for generating a plurality of color signal values (R, G, B) for each pixel from the sensor output signal; and a clipping device (8) for clipping the sensor output signal or the plurality of color signal values (R, G, B). Preferably, the signal processing device further comprises: a conversion unit (6) for generating luminance signals (Y) and chrominance signals (U, V) from the plurality of color signal values (R, G, B), and an adjustment unit (10) for selectively setting the chrominance signals (U, V) to a zero color difference when clipping is performed (8).

Abstract: Circuit comprising a signal input (11) for receiving an input signal (s(t)) and a digital output stage (15) being designed for operation at a supply voltage (VDD). The output stage (15) comprises a series of two n-channel CMOS transistors (no1, no2), a common node (17) between the two n-channel CMOS transistors (no1, no2), and an output port (16). Active voltage limiting means (14) are arranged between the signal input (11) and the common node (17) for limiting voltages (VNM) at the common node (17) to a voltage limit (Vmax). The voltage limiting means (14) are controllable byte state of the input signal (s(t)).

Abstract: A trench-gate semiconductor device, for example a MOSFET or IGBT, includes a semiconductor body (20) having a drain region (4) comprising a drain drift region (4a) and a drain contact region (4b). An insulated field plate (24) is included in the trench (10) between the gate (8) and the drain contact region (4b), wherein the field plate (24) is for connection to a bias potential greater than the gate potential and near to the bulk breakdown voltage of the drain drift region (4a). The field plate (24) causes the potential drop across the drain drift region (4a) to be spread considerably more evenly, particularly at applied voltages greater than the bulk breakdown voltage, thereby substantially increasing the breakdown voltage of the device.