Abstract: The ?? AD converter includes: a sampling section for sampling an input signal at each cycle Ts; an AD conversion section for performing AD conversion of the input signal; a DA conversion section for performing DA conversion of an output of the AD conversion section; and a loop filter for integrating a difference obtained by subtracting an output of the DA conversion section from an output of the sampling section so as to output the integrated difference to the AD conversion section, wherein the sampling section includes two sampling circuits disposed parallel to each other, and the two sampling circuits respectively operate at timings different from each other, and each of the sampling circuits delays the input signal so as to output the delayed input signal.

Abstract: An improved ?? analog to digital converter system with automatic gain control response to out-of-band interferers including a ?? multibit analog to digital converter responsive to an analog input for providing a digital output including the in-band signal and out-of-band interferers and quantization noise and a signal peak estimator circuit responsive to the out-of-band interferers for generating a gain control signal for adjusting the gain of a variable gain element which may be an independent element such as a variable gain amplifier or it may be the analog to digital converter itself by virtue of its having an adjustable full-scale.

Abstract: A programmable Sigma-Delta Modulator (SDM) includes a first input to select an oversampling rate (OSR), which has a corresponding resonator coefficient value to provide an optimal notch in the Noise Transfer Function (NTF).

Abstract: A modulator integrator circuit includes an amplifier having a capacitive feedback connection, a variable voltage generator, a fixed voltage reference, and a capacitor having a first plate and a second plate. The first plate of the capacitor is coupled to the variable voltage generator. The modulator reference circuit further includes a first switch that selectively couples the second plate of the capacitor to the amplifier and a second switch that selectively couples the second plate of the capacitor to the fixed voltage reference.

Abstract: By using a selector, an output of a delta sigma modulator having a quantizer for quantizing a signal is selectively supplied to one of a first D/A converter having a linear amplifier and a second D/A converter having a digital amplifier. Further, the number of quantization levels of the quantizer, the sampling frequency, or the order of a transfer function of the delta sigma modulator is selected by a control signal selector in conjunction with the selector. An output of the first D/A converter is supplied to a line terminal, while an output of the second D/A converter is supplied to a headphone terminal.

Abstract: An electronic apparatus for current source array and the layout method thereof are provided. The current source array includes a low bit group and a plurality of high bit groups. The low bit group has a plurality of current source units and is disposed at a central block of a layout area. In addition, each of the high bit groups has a plurality of current source units respectively disposed at a plurality of peripheral blocks of the layout area.

Abstract: A signal amplification system including a plurality of digital signal inputs coupled to a signal combination devices, wherein each of the plurality of digital signal inputs correspond to a separate digital signal, a signal conversion device coupled to the signal combination device, an up-conversion device coupled to the signal conversion device, and an amplification unit coupled to the up-conversion device. The plurality of signals are combined into a combined digital signal in the signal combination device, the combined digital signal is converted into a combined analog signal in the signal conversion device, the combined analog signal is up-converted into an up-converted analog signal in the up-conversion device, and the up-converted analog signal is amplified into an amplified output in the amplification device. Various systems and methods to combine and amplify digital signals and analog signals.

Abstract: A digital-to-analog converter (DAC) comprises a capacitive DAC that comprises N first capacitances that are connected in parallel and that have first ends and second ends, wherein N is an integer greater than one, and N first switches that selectively connect a selected one of the second ends of the N first capacitances to a common node and non-selected ones of the second ends of the N first capacitances to one of a voltage potential and a reference potential. Capacitance values of the N first capacitances are substantially equal. A second DAC communicates with the common node.

Abstract: Staggered interleaved Nyquist regions associated with differing ADC clock rates (FCLK) avoids spectrum lost through disjoint guard bands at the end of or between adjacent Nyquist regions. The staggered interleaved Nyquist regions overlap by an amount at least as much as is consumed by the guard bands. Selectable anti-aliasing filters associated with each Nyquist region and its ADC clock rate are used to enforce the staggered Nyquist regions and their various guard bands. For example, and neglecting guard bands, an initial raw band of operation RB1 may be the First Nyquist region for a basic sampling frequency Fs. An adjacent raw band of operation RB2 that overlaps RB1 may be the Second Nyquist region for an alternate sampling frequency 2Fs/3. An adjacent raw band of operation RB3 that overlaps RB2 may be the Second Nyquist region for the basic sampling frequency Fs. These raw bands interleave and overlap: RB1: DC to Fs/2 1st Nyq. for FCLK = Fs RB2: (2/3)Fs ? to 2(2Fs/3)/2 = 2nd Nyq.

Abstract: The analog-to-digital for converter (ADC) for converting an analog value into a digital equivalent using a parallel digital data path is disclosed. In one example embodiment, the ADC includes a switched capacitor DAC having an input to receive an analog value via analog sample and hold circuit. A comparator is coupled to the switched capacitor DAC. A successive approximation register (SAR) is coupled to the comparator. A plurality of logic blocks is coupled to the SAR. A plurality of thermometric encoders is coupled to the associated plurality of logic blocks. A plurality of MUXs is coupled to the associated plurality of thermometric encoders and the comparator, wherein the plurality of MUXs having associated outputs that is coupled to the input of the switched capacitor DAC.

Abstract: A system for simultaneously propagating dual polarized signals in a polarimetric radar system includes a system for coding at least one of the two signals. The simultaneous dual polarization weather radar transmits signals in both the horizontal and vertical orientations at the same time. Upon reception, the signals in each channel are decoded and a number of standard and polarimetric parameters characterizing atmospheric conditions are determined. The accuracy upon which these parameters can be determined depends partially upon the interference between these two channels. The system and method isolates the vertical and horizontal channels to minimize the interference.

Abstract: Disclosed is a radar system which comprises an AD conversion unit for converting an analog signal obtained from an antenna into a digital signal, a frequency analysis unit for performing a frequency analysis of the digital signal converted by the AD conversion unit, a time-frequency analysis unit for performing a time-frequency analysis of the digital signal converted by the AD conversion unit, and a target detection unit for detecting a target based on a signal of which the frequency analysis is performed by the frequency analysis unit and a signal of which the time-frequency analysis is performed by the time-frequency analysis unit.

Abstract: An active antenna is provided that includes an antenna element for transmitting RF transmit signals at a predetermined effective radiated power (ERP). An antenna module is configured to be mounted to an aircraft, with the antenna element being mounted to the antenna module. A connector module is provided at the antenna module and is configured to be coupled to a communications link and receive electrical transmit signals from the communications link. A transmit path is provided within the antenna module and extends between the antenna element and the connector module. A power amplifier is provided on the antenna module along the transmit path. The power amplifier increases a power level of the electrical transmit signals, received from the communications link, by a predetermined amount sufficient to drive the antenna element to transmit the RF transmit signals at the predetermined ERP.

Abstract: A radar controlled automatic target illumination system for marine and other moving vessels. A radar system operably connected to the vessel produces an electronic signal corresponding to an azimuth of a target relative to, and in proximity to the vessel. An array of lights are connected to the vessel, each light being aimed outwardly in a different lighting sector, the sectors being adjacent one to another around the vessel, each of said lights, when automatically activated, illuminating one lighting sector. An electronic processor is operably connected between the radar system and the array of lights for the automatic selective activation of one or more of the lights to illuminate the target within a corresponding lighting sector which the radar system has identified.

Abstract: A radar system mounted on a vehicle includes a first radar and a second radar, each having a transmitter-receiver and a signal processor. The transmitter-receiver transmits radar waves to detect objects such as another vehicle or other obstacles. An operating cycle period T1, T2 and a transmission time X1, X2 during which the radar waves are transmitted are set in both radars to satisfy the formula: K·T2+X2+X1?T1?(K+1)·T2?X2?X1 under a condition that T1>T2, where K is a positive integer. By setting both radars in this manner, interference between two radars is avoided without using additional devices in the radar system, and a high detection accuracy is realized.

Abstract: A ranging system and ranging method are provided. The ranging system includes a transmission signal generator which generates a transmission signal, which is transmitted from a transmission device to a reception device; a correction signal generator which converts the transmission signal, which is processed in the reception device and re-input to the transmission device, into a correction signal; a reference signal generator which generates a reference signal, an overlap detector which detects an overlap region between the correction signal and the reference signal; a time calculator which calculates a transmission time of the transmission signal; and a distance calculator which calculates a distance between the devices using the transmission time.

Abstract: In a radar apparatus constructed to perform switching between a plurality of receiving antennas by using a switch, the effect of noise induced by the antenna switching is eliminated. A situation where there is no echo signal from a target is created, for example, by turning off a transmitter amplifier, and the Fourier transformed result obtained at this time is taken as a correction value and stored in a memory. During radar operation, the effect of the noise induced by the antenna switching can be eliminated by subtracting the correction value from the Fourier transformed result.

Abstract: A radar receiver system includes a receiver, a processor including a Doppler Compensated Adaptive Pulse Compressor (DCAPC) algorithm, possible other intermediate processing and a target detector. The DCAPC algorithm processes samples of a radar return signal, applies Minimum Mean Square Error (MMSE), or alternatively matched filtering, to the radar return signal to obtain initial radar impulse response estimates, computes power estimates, estimates a range cell Doppler shift for each range cell, computes range-dependent filters, applies the MMSE filters, and then repeats the cycle for subsequent reiterative stages until a desired length?L range window is reached, thereby resolving the scatterer from noise and other scatterers.

Abstract: The present invention provides methods and systems that enable a mobile navigation receiver to accurately determine its trajectory with non-current ephemeris in stand-alone mode. In an embodiment, the receiver computes the position for the same location using non-current ephemeris and current ephemeris at different time instances. The receiver then determines a position correction by finding the difference between these two computed positions, and applies this correction to the trajectory generated with non-current ephemeris to obtain a more accurate trajectory. In another embodiment, the receiver computes an initial position of the receiver using non-current ephemeris and finds the difference between the computed initial position and an accurate approximation of the initial position. The receiver then shifts the subsequent receiver trajectory computed using non-current ephemeris by the difference to obtain a more accurate trajectory.

Abstract: Disclosed is a method for determining coordinates of a mobile rover. The method includes determining a vector of one-shot code coordinates of the mobile rover. The method also includes determining a vector of phase increments by determining full phase differences for each navigation satellite in a plurality of navigation satellites in view at a discrete time interval (called a time epoch) and at a previous time epoch in a plurality of time epochs. A vector of radial range increments is determined from the full phase differences. A vector of rover phase coordinate increments is also determined using the vector of radial range increments. The vector of one-shot code coordinates and the vector of rover phase coordinate increments are then filtered to determine, at each time epoch, smoothed code coordinates of the mobile rover. Measured phase increments are cleared up from abnormal measurements.

Abstract: A positioning system includes a positioning device with a local antenna. One or more remote antennas are also connected to the device. The system selects one or more antennas to use in determining a position based at least in part on an orientation of the device. Other factors which may be used in selection include: a particular environment of the device, manual override, signal quality, and a stage in a workflow process.

Abstract: A three-dimensional antenna structure suitable for being built in an electronic device includes a vertical patch, an annular patch and a ground patch. The vertical patch is suitable for generating a vertical current. One end of the annular patch is connected to the vertical patch, and the annular patch surrounds one side of the vertical patch for generating an annular current. An omni-directional radiation field is generated by the annular current and the vertical current. The annular patch has a feed point for electrically connecting to a signal source. One end of the ground patch is connected to the vertical patch. A distance exists between the end of the annular patch and the end of the ground patch. The other end of the ground patch has a shorting point next to the feed point and is suitable for electrically connecting to a ground.

Abstract: A slot and multi-inverted-F coupling wideband antenna and an electronic device using the aforementioned wideband antenna are disclosed. The antenna includes at least a ground portion, a first radiation portion, a second radiation portion, a third radiation portion, a fine tuning metal portion, and a transmission cable. The first radiation portion is electrically coupled to the ground portion. The fine tuning metal portion is electrically coupled to the first radiation portion. The second radiation portion is electrically coupled to the fine tuning metal portion and forms a first inverted-F antenna with the first radiation portion. The third radiation portion is electrically coupled to the fine tuning metal portion and forms a second inverted-F antenna with the first radiation portion. The transmission cable is electrically coupled to one of the first radiation portion and the fine tuning metal portion.

Abstract: An ultra-wideband (UWB) antenna (10), disposed on a substrate (30), includes a body (100), a feeding part (160), and at least one first ground plane (120). The body, for receiving and transmitting electromagnetic signals, includes a first radiating part (102) and a second radiating part (104) connected to the first radiating part. The body defines a gap (106) between the first radiating part and the second radiating part. The feeding line, electrically connected to the body, feeds electromagnetic signals to the body. The at least one first ground plane is disposed on a side of the feeding part, and is grounded.

Abstract: A microstrip reflectarray antenna with a low cross polarization level is disclosed. The microstrip reflectarray antenna of the present invention comprises: a ground plate; a reflecting plate with an upper surface, and a plurality of microstrip antenna units locating on the upper surface; each of the microstrip antenna units consisting of an inner ring and an outer ring; a plurality of supporting units for supporting the reflecting plate above the ground plate; and a signal transmitting unit locating above the reflecting plate for transmitting and receiving the high frequency signal. Besides, the size of the outer ring corresponds to its location on the upper surface of the reflecting plate, and there is a predetermined ratio between the diameter of the outer ring and the diameter of the inner ring, and both of the outer ring and the inner ring respectively have at least one slot.

Abstract: An antenna unit has a first antenna operating at wireless telecommunication bands and a second antenna operating at wireless local area network bands. The first antenna has a first radiating conductor with a first feeding point defining opposite sides, a second, a third and a fourth radiating conductors extending from both sides of the first radiating conductor. A parasitic element defines opposite ends. One end of the parasitic element confronts the free end of the third radiating conductor. A trap circuit connects the fourth radiating conductor and the parasitic element. A second antenna has a third side, a fourth side and a stair-shape side. The connection of the sides of the second antenna forms a first protrusion with a second feeding point and a second protrusion confronting the first antenna. A slot is opened on the second antenna. A ground portion is spaced from the first radiating conductor and the first protrusion.

Abstract: An antenna unit includes a feeding component 40 and a metal plate 50 on which the feeding component 40 is mounted. The feeding component 40 has an attaching member 43 made of resin to support a feeding line against the metal plate. The metal plate 50 has a pair of cut and raised parts 51 at both ends thereof while the attaching member 43 has a pair of locking hooks 432 at both ends thereof. The locking hooks are partly inserted into the cut and raised parts and thereby the feeding component is attached to the metal plate without projecting any parts of the attaching member from a rear surface of the metal plate.

Abstract: An antenna comprising: a first substantially planar ground plate; a first substantially planar resonator positioned in a plane substantially parallel to the first ground plate; a second substantially planar ground plate positioned in a plane substantially parallel to the first ground plate; two or more connectors for electrically connecting the second ground plate to ground; and one or more connectors for electrically connecting the first resonator to the second ground plate; wherein the first resonator and the second ground plate are connected to at least one of receiver means and transmitter means by antenna feeding means.

Abstract: Two antenna elements are planar and stored in a housing. An antenna element is arranged with the antenna faces of the antenna elements orthogonal to the plane of the substrate. The shape, interval, etc. of the antenna element depend on an available frequency. The length of an electric field vector generated between the substrate and the antenna element becomes longer as the antenna element is farther from the substrate. The frequency corresponding to the electric field vector changes corresponding to the radio signal frequency, that is, higher or lower. That is, in the above-mentioned antenna structure, the band of the frequency response is broader. Therefore, in the above-mentioned antenna structure, the frequency response band can be increase and space can be saved in storing an antenna in a housing using a simple structure in which the antenna face of an antenna element is arranged orthogonal to the plane of the substrate.

Abstract: An adaptive antenna apparatus includes antenna elements. One of the antenna elements has an electrical length L1 larger than ?/2, and equal to or smaller than a predetermined upper-limit wavelength, where ? is a wavelength of a radio signal. Another antenna element has an electrical length L2 equal to or larger than a predetermined lower-limit wavelength and equal to or smaller than ?/2. A controller adaptive-controls the adaptive antenna apparatus to form a radiation pattern of the adaptive antenna apparatus including a plurality of nulls substantively in a direction of an interference wave by adjusting at least one of an amplitude and a phase of each radio signal received by the first and second antenna elements.

Abstract: An inverted F-antenna may include an element formed from conductor patterns on a plurality of layers including at least one buried layer of a multilayer PCB, wherein (a) the conductor patterns are in stacked relation and interconnected through the PCB, (b) the conductor patterns comprise an F-shaped conductor pattern on one layer of the PCB and an I-, L- or F-shaped conductor pattern on the or each other layer, and (c) the or each I-, L- or F-shaped conductor pattern comprises an upright substantially coextensive with an upright of the F-shaped conductor pattern. A mobile phone may include such an antenna.

Abstract: A compact SATCOM antenna is provided having an LNA integrated into the radiator body which may be mounted to a handheld satellite radio and articulated with respect to the radio to assume a wide variety of positions for communication with a geosynchronous satellite.

Abstract: A chip antenna apparatus for receiving global positioning system signals, includes a L-shaped ground area and an omni-directional chip antenna. The L-shaped ground area is disposed on a circuit board. The omni-directional chip antenna is disposed in a gap of the L-shaped ground area on the circuit board and electrically connected to the L-shaped ground area.

Abstract: A GPS antenna has two electrically connected L-sections disposed on opposite sides of a circuit board. The L-sections lie on two separate planes parallel to the circuit board surface. One L-section is connected to a feeding point located at one edge area of the circuit board and the other L-section is connected to a grounding point located at an opposite edge area of the circuit board. Optionally, a second grounding point is connected to the antenna element adjacent to the feeding point for impedance matching purposes. The antenna is configured for use in an electronic device such as a mobile phone.

Abstract: The present invention relates generally to a new family of antennas with a multiband behavior, so that the frequency bands of the antenna can be tuned simultaneously to the main existing wireless services. In particular, the invention consists of shaping at least one of the gaps between some of the polygons of the multilevel structure in the form of a non-straight curve, shaped in such a way that the whole gap length is increased yet keeping its size and the same overall antenna size. Such a configuration allows an effective tuning of the frequency bands of the antenna, such that with the same overall antenna size, said antenna can be effectively tuned simultaneously to some specific services, such as for instance the five frequency bands that cover the services AMPS, GSM900, GSM1800, PCS1900, UMTS, Bluetooth™, IEEE802.11b, or HyperLAN.

Abstract: An offset overlapping slot line comprises a first metallization on a first side of a dielectric substrate and a second metallization on a second side of a dielectric substrate cooperating to yield a transmission line. By overlapping the first and second metallizations, one may achieve much lower impedance than in traditional slot line transmission line structures. An offset overlapping slot line antenna apparatus incorporates an offset overlapping slot line in a feed region. This has the benefit of yielding a low input impedance. A low input impedance allows a transmit antenna to bed driven efficiently even by low voltage, high current drivers. Also a low input impedance can help reduce thermal noise in a received front-end. This technique is well suited for application to dipole, monopole, slot, and annular slot antennas, to name a few examples.

Abstract: A dual band antenna with a corrugated feed horn comprises a waveguide and a feed horn assembly. The feed horn assembly comprises at least two portions. Two portions each have at least a cylindrical ring and a groove, in which the groove is between two cylindrical rings. By means of adjusting a depth and width of the grooves and a walls width and number of loops of the cylindrical rings of two portions causes each portion responds to different frequency band electromagnetic signal separately and thereby can be adapted to receive radio signals in at least two frequency bands electromagnetic signals. Therefore, this single antenna can be adapted to receive radio signals in two frequency bands. The antenna can effectively reduce manufacturing cost and save space.

Abstract: A planar antenna fitted with a reflector of small shape and small depth. A reflector 21 of planar shape is provided at the rear face of a radiator 20 of planar shape made of a triangular loop element. The side sections 21b on both sides of the reflector 21 are bent towards the radiator 20 and the separation .alpha.2 between the leading edges of the side sections 21b and the side edges of the radiator 20 is thereby reduced. In this way, an excellent electrical characteristic of the planar antenna 2 fitted with a reflector and can be achieved by reducing the separation D2 of the radiator 20 and reflector 21.

Abstract: A broadband dipole including two co-working conductors. The invention is characterized in, that a first of the conductors (11) is comprised of a rod (12) including a substantially centrally located axial hole (2), said hole (2) forming an outer conductor (11) of a coaxial line, and that the second conductor (5) is comprised of a solid rod, and that a metallic wire (5) inserted centrally in the axial hole (2) of the first conductor (11) is connected to the second conductor (5).

Abstract: A wireless communication device coupled to a wave antenna that provides greater increased durability and impedance matching. The wave antenna may be in the form of a polygonal, elliptical curve and/or coil shape. The wireless communication device is coupled to the wave antenna to provide wireless communication. The wireless communication device and wave antenna may be placed on objects, goods, or other articles of manufacture that are subject to forces such that the wave antenna may be stretched or compressed during the manufacture and/or use of such object, good or article of manufacture. The wave antenna, because of its curved structure, is capable of stretching and compressing more easily than other structures, reducing the wireless communication device's susceptibility to damage or breakage that might render the wireless communication device coupled to the wave antenna unable to properly communicate information wirelessly.

Abstract: A method of changing a resonant frequency of an antenna includes coupling the antenna to a ground plane of a circuit board, where the ground plane includes conductive material. The method further includes removing a section of conductive material from a first location of the ground plane, where the shape of the removed section and the first location determine the resonant frequency of the antenna.

Abstract: An antenna mount having a bracket with a projecting first cam mount and a pivot connection hole formed in a mounting surface. A base bracket having a base portion with a first cam slot and a pivot bolt hole adapted to align with the first cam mount and the pivot connection hole, respectively. A first fastener coupling the base bracket to the mounting surface between the pivot connection hole and the pivot bolt hole, the first cam mount projecting through the first cam slot. A cam with an eccentric mounting hole adapted to fit upon the first cam mount. The first cam rotatable about the first cam mount pivoting the base bracket about the pivot connection hole as a contact edge of the first cam abuts at least one first cam guide(s) of the base bracket. Further, the antenna mount may include a second cam and associated pivot arrangements to provide a second axis of adjustment.

Abstract: An attachment rack apparatus with antenna is provided, including a first connection unit, a second connection unit and an antenna unit. The first connection unit includes a first attachment plate and a second attachment plate. One end of the first and second attachment plates are connected together. The two attachment plates are arcs facing each other to form a non-closed space. The bottom of the second connection unit is attached to the joint of the first and the second attachment plates. The top of the second connection unit is attached to the antenna unit. The second connection unit provides the antenna unit with space and mechanism for adjustment in angles, positions and orientations. The present invention is applicable to a holder with suction disc for holding electronic devices in a vehicle.

Abstract: An antenna mounting bracket has a stationary leaf, a housing, a sliding plug and a spring. The stationary leaf has a connecting rod formed coaxially on and protruding from the stationary leaf. The housing is connected pivotally on the stationary leaf and has a proximal end, a distal end, a cavity formed coaxially in the proximal end and has a connecting leaf formed coaxially on and protruding from the distal end and attaching to an antenna. The sliding plug is mounted slidably in the cavity and presses against the connecting rod. The spring is mounted in the cavity between the housing and the sliding plug to press the sliding plug against the connecting rod. The antenna mounting bracket connects an antenna to a notebook computer and allows the antenna to fold against the notebook computer when not being used. Consequently, the antenna is stable when folded or extended.

Abstract: To provide an RFID (a signal processing circuit) equipped with a single rectangular spiral antenna and being capable of transmitting and receiving an electric power and signal by a plurality of frequency bands therewith, the present invention limits a longitudinal dimension (long sides) of the rectangular spiral antenna designed for transmission and reception of carrier of the HF band thereby to the length suitable for transmission and reception of carrier of the UHF band thereby as well as a widthwise dimension thereof so as to prevent a current waveform due to the carrier of the UHF band from reversing in phase at one of the long sides thereof.

Abstract: A dielectrically-loaded helical antenna has a cylindrical ceramic core bearing metallised helical antenna elements which are coupled to a coaxial feeder structure passing axially through the core. Secured to the end face of the core is an impedance matching section in the form of a laminate board. The matching section embodies a shunt capacitance and a series inductance.

Abstract: An antenna comprises electrical conductors arranged to form a radiating element including a folded line configuration and a distributed strip configuration, where the radiating element is in proximity to a ground conductor. The folded line and the distributed strip can be electrically interconnected and substantially coplanar. The ground conductor can be spaced from, and coplanar to, the radiating element, or can alternatively lie in a plane set at an angle to the radiating element. Embodiments of the antenna include conductor patterns formed on a printed wiring board, having a ground plane, spacedly adjacent to and coplanar with the radiating element. Other embodiments of the antenna comprise a ground plane and radiating element on opposed sides of a printed wiring board. Other embodiments of the antenna comprise conductors that can be arranged as free standing “foils”. Other embodiments include antennas that are encapsulated into a package containing the antenna.

Abstract: A display panel control circuit includes a voltage controlled oscillator (VCO) for outputting a clock signal, a first-panel horizontal system pulse generation section, a second-panel horizontal system pulse generation section, a vertical system pulse generation section which is commonly used among the first and second panels, a phase comparator, and a smoothing element. The first-panel horizontal system pulse generation section and the second-panel horizontal system pulse generation section respectively generate a reference signal of a first-panel horizontal system output group and a reference signal of a second-panel horizontal system output group from signal VCOCLK1 output from the VCO. Thus, it is possible to simultaneously drive two different panels.

Abstract: The present invention is directed to appropriately rendering terminal server graphical data at multiple client side monitors. In some embodiments, a client sends client side monitor configuration for a plurality of monitors to a server. The server simulates a virtual desktop for the plurality of monitors based on the client side monitor configuration. Graphical data generated for the simulated virtual desktop is converted to drawing commands and returned to the client for rendering. In other embodiments, a separate terminal server session is established for each of a plurality client side monitors. Drawing commands for a specified client side monitor is sent from the terminal server to the client over the corresponding session for the client side monitor.

Abstract: A multi-display apparatus includes flat panel display devices and an optical path changing unit. The flat panel display devices include adjacent sides connected to each other. The optical path changing unit has an inclined surface symmetrical to a boundary surface of the flat panel display devices and shifting light emitted from the flat panel display devices toward a boundary surface between the flat panel display devices to display an image without a non-display area.