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63results about How to "High modulation accuracy" patented technology
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Two-point frequency modulation apparatus, wireless transmitting apparatus, and wireless receiving apparatus
InactiveUS20050232385A1Reduces input timing differenceHigh modulation accuracyPulse automatic controlAngle modulation detailsLoop filterPhase difference
A two-point frequency modulation apparatus is provided that reduces input timing difference and improves modulation accuracy. Two-point frequency modulation apparatus 10 has: PLL circuit 11; frequency division ratio generator 13 that generates the frequency division ratio in frequency divider 111 based on first digital baseband signal S1 and carrier signal; adder 114 that adds second digital baseband signal S2 to the output signal of loop filter 113; a delay index calculator (filter coefficient calculator 17) that calculates the delay index based on the magnitude of change in the amplitude of the output signal of adder 114; and a delay adjuster (digital filter 18) that shifts the phase of one of first digital baseband signal S1 and second digital baseband signal S2 according to the delay index so as to reduce the phase difference.
Owner:PANASONIC CORP
Microwave transmitter and the method for increasing envelope bandwidth
InactiveUS20070018718A1Low efficiencyPower flexibleAmplifier detailsDc amplifiers with modulator-demodulatorCarrier signalEngineering
The microwave transmitter of the present invention can perform two-terminal dynamic modulation with respect to the voltage supply terminal and the RF input terminal of a RF power amplifier. The microwave transmitter of the present invention comprises a first modulator and a second modulator. The first modulator uses the baseband digital delta-sigma modulation technique to process the envelope signal and outputs this signal to the voltage supply terminal of the RF power amplifier as a supply voltage. The second modulator uses the baseband digital pre-distortion technique to process the IQ-modulated carrier and outputs this signal to the RF input terminal of the RF power amplifier as a RF input signal. Thereby, the RF power amplifier can highly efficiently reconstruct the power-amplified RF modulated carrier without distortion at the RF output terminal. In addition, the baseband digital processing techniques used in the two modulators make the microwave transmitter of the present invention suitable for multi-mode operation.
Owner:NAT SUN YAT SEN UNIV +1
Modulator and correction method thereof
InactiveUS20060055466A1High modulation accuracyDifference can be detectedPulse automatic controlAngle modulation detailsLoop filterControl signal
An object of the invention is to provide wideband modulator using a PLL synthesizer which can match the frequency characteristic and prevent degradation in modulation accuracy even in the presence of a variation in the manufacture of circuit components. In a wideband modulator which modulates the division ratio of a frequency divider by using a modulating signal generated by a modulating signal generator and outputs a modulated carrier signal from a VCO, first and second calibration data from a calibration data generator are input via a selector. The amplitude value of an ac component of each modulating signal appearing on the output of a loop filter or the amplitude value of an ac component of each modulating signal demodulated by a demodulator is converted to a digital value by way of an AID converter. The difference between the two is detected by error detection means and a control signal FCR to eliminate the difference is generated by frequency characteristic correction means in order to correct the frequency characteristic of a PLL or a pre-distortion filter.
Owner:PANASONIC CORP
Frequency modulator, frequency modulating method, and wireless circuit
ActiveUS7075383B2High modulation accuracyPulse automatic controlAngle modulation detailsLow-pass filterEngineering
A voltage controlled oscillator 1, a variable frequency divider 2, a phase comparator 3, and a loop filter 4 form a Phase Locked Loop (PLL). A sigma-delta modulator 5 sigma-delta modulates data obtained by adding a fractional part M2 of the frequency division factor data with modulation data X by using an output signal of the variable frequency divider 2 as a clock. An output signal of the sigma-delta modulator 5 is added to an integral part M1 of the frequency division factor data, and the resultant data becomes effective frequency division factor data 13 of the variable frequency divider 2. An output signal of the sigma-delta modulator 5 also becomes control data 14 after passing through a D / A converter 6, a low-pass filter 7, and an amplitude adjustment circuit 8. The control data 14 is inputted into a frequency modulation terminal of the voltage controlled oscillator 1. Therefore, it is possible to provide a frequency modulator that can use a reference signal source having no frequency modulation function, and perform modulation over a wide range of frequencies based on a digital modulation signal.
Owner:PANASONIC CORP
PLL modulation circuit and polar modulation apparatus
InactiveUS7157985B2High modulation accuracySimultaneous amplitude and angle modulationPulse automatic controlControl signalEngineering
First and second calibration signals (308, 309) are sent to a frequency divider (102) and an adder (116) of a PLL section (100A), demodulated in a demodulator (111), filtered through a low pass filter (113) and a high pass filter (114) and thereafter sent to a modulation signal control circuit (115). The modulation signal control circuit (115) generates control information (318) in comparison with the phase and amplitude of the first and second calibration signals (308 and 309) and sends the control information (318) to a modulation control signal generator (106). Modulation control signal generator (106) holds the control information (318) and controls the values of the first modulation signal and second modulation signal sent to the frequency divider (102) and adder (116) on the based on the control information (318) held in modulation operation.
Owner:PANASONIC CORP
Liquid crystal-based direct-view anti-glare imager and anti-glare imaging method
InactiveCN101995731AImprove image qualityHigh modulation accuracyTelevision system detailsStatic indicating devicesEyepiecePupil
The invention discloses a liquid crystal-based direct-view anti-glare imager, which comprises an objective imaging system, wherein a high-temperature polycrystalline silicon (HTPS) liquid crystal plate is arranged on the light exit side of the objective imaging system; a semi-reflector a, a semi-reflector b and an eyepiece imaging system are arranged on the light exit side of the HTPS liquid crystal plate in turn; an infrared light-emitting diode is arranged outside the eyepiece imaging system; a right-angle prism is arranged on a light reflecting side of the semi-reflector a; a semi-reflector c and a charge coupled device (CCD) are arranged on the light reflecting side of the right-angle prism in turn; the CCD is electrically connected with a circuit control module; and the output end ofthe circuit control module is connected with the HTPS liquid crystal plate. The invention also discloses an anti-glare imaging method. In the method, the infrared light-emitting diode is used as a light source to lighten eyes, automatic focusing is controlled after an eye stare direction is determined by collecting, processing and feeding back the pupil image information of a photographer, and the HTPS liquid crystal plate is used to modulate all pixels one by one, so that the contrast ratio of an image is reduced and the definition of the image is improved.
Owner:XIAN UNIV OF TECH
Elliptic partial measurement device and measurement method based on spatial light modulator
InactiveCN102980530AModulation speedHigh modulation accuracyUsing optical meansPolarizerMeasurement device
The invention relates to an elliptic partial measurement device and a measurement method based on a spatial light modulator, which are applied to observation measurement on the thickness of a sample surface nano-scale thin film. The elliptic partial measurement device has the characteristics that the phase delay of polarization in the two vertical directions of a light beam is changed by adopting the spatial light modulator, an elliptic partial image of the sample surface thin film is recorded by adopting an area array detector, data is processed by adopting a fitting algorithm and an iterative algorithm, and the shape parameter of the sample surface thin film is accurately measured. The elliptic partial measurement device has the beneficial effects that no rotating part exists, the system instability and the azimuth angle deviation are eliminated, the elliptic partial measurement device is not sensitive to temperature, and the defects of a polarizer rotating type and photo-elastic modulation type ellipsometer are effectively overcome.
Owner:TSINGHUA UNIV
Frequency modulator, frequency modulating method, and wireless circuit
InactiveUS20050213697A1Stable output signalHigh modulation accuracyPulse automatic controlAngle modulation detailsGreek letter sigmaEngineering
A voltage controlled oscillator 1, a variable frequency divider 2, a phase comparator 3, and a loop filter 4 form a Phase Locked Loop (PLL). A sigma-delta modulator 5 sigma-delta modulates data obtained by adding a fractional part M2 of the frequency division factor data with modulation data X by using an output signal of the variable frequency divider 2 as a clock. An output signal of the sigma-delta modulator 5 is added to an integral part M1 of the frequency division factor data, and the resultant data becomes effective frequency division factor data 13 of the variable frequency divider 2. An output signal of the sigma-delta modulator 5 also becomes control data 14 after passing through a D / A converter 6, a low-pass filter 7, and an amplitude adjustment circuit 8. The control data 14 is inputted into a frequency modulation terminal of the voltage controlled oscillator 1. Therefore, it is possible to provide a frequency modulator that can use a reference signal source having no frequency modulation function, and perform modulation over a wide range of frequencies based on a digital modulation signal.
Owner:PANASONIC CORP
Two-point frequency modulation apparatus, wireless transmitting apparatus, and wireless receiving apparatus
InactiveUS7333582B2Reduces input timing differenceHigh modulation accuracyPulse automatic controlModulated-carrier systemsLoop filterPhase difference
A two-point frequency modulation apparatus is provided that reduces input timing difference and improves modulation accuracy. Two-point frequency modulation apparatus 10 has: PLL circuit 11; frequency division ratio generator 13 that generates the frequency division ratio in frequency divider 111 based on first digital baseband signal S1 and carrier signal; adder 114 that adds second digital baseband signal S2 to the output signal of loop filter 113; a delay index calculator (filter coefficient calculator 17) that calculates the delay index based on the magnitude of change in the amplitude of the output signal of adder 114; and a delay adjuster (digital filter 18) that shifts the phase of one of first digital baseband signal S1 and second digital baseband signal S2 according to the delay index so as to reduce the phase difference.
Owner:PANASONIC CORP
An optical amplitude modulation method suitable for a CVQKD system
InactiveCN109257104AImproved Modulation AccuracyHigh modulation accuracyPhotonic quantum communicationElectromagnetic transmittersOptical isolatorCryptosystem
The invention discloses an optical amplitude modulation method suitable for a CVQKD system. The modulation method comprises an optical isolator, a polarization-maintaining optical coupler BS, a phasemodulator PM and a delay optical fiber DL. Only two passive devices (an optical loop and a 2*2 optical coupler) and a phase modulator are needed to modulate the amplitude of the optical signal precisely by using the special structure of an optical fiber Sagnac (Sagnac) loop. As that amplitude modulation method of the invention does not have the bias drift of the working point when the amplitude ismodulate, the modulation accuracy is high, and the external feedback control is not needed at the same time, the realization structure is simple, the cost is low, and the requirement for the modulated signal is low. This method is especially suitable for amplitude modulation of quantum optical signals in continuous variable quantum cryptosystems. It can greatly improve the stability of continuousvariable quantum key distribution system and greatly promote the practical application of continuous variable quantum cryptosystems.
Owner:NO 30 INST OF CHINA ELECTRONIC TECH GRP CORP
Low polarization dependent loss lithium niobate straight-bar waveguide phase modulator and manufacturing method thereof
ActiveCN103676219ALow polarization dependent lossSmall differenceNon-linear opticsSurface layerCoupling
Owner:BEIJING AEROSPACE TIMES OPTICAL ELECTRONICS TECH
PLL modulation circuit and polar modulation apparatus
InactiveUS20050242889A1High modulation accuracySimultaneous amplitude and angle modulationPulse automatic controlHigh-pass filterEngineering
First and second calibration signals (308, 309) are sent to a frequency divider (102) and an adder (116) of a PLL section (100A), demodulated in a demodulator (111), filtered through a low pass filter (113) and a high pass filter (114) and thereafter sent to a modulation signal control circuit (115). The modulation signal control circuit (115) generates control information (318) in comparison with the phase and amplitude of the first and second calibration signals (308 and 309) and sends the control information (318) to a modulation control signal generator (106). Modulation control signal generator (106) holds the control information (318) and controls the values of the first modulation signal and second modulation signal sent to the frequency divider (102) and adder (116) on the based on the control information (318) held in modulation operation.
Owner:PANASONIC CORP
Active terahertz optical comb tooth width modulation method
InactiveCN106444210AStrong maneuverabilityHigh modulation accuracyNon-linear opticsPhysicsLight source
The invention relates to an active terahertz optical comb tooth width modulation method. The method comprises the steps of outputting an electrical signal with a periodic change at a frequency f by means of a signal source to act on a step recovery diode, and outputting an electric pulse signal with the time domain interval being T= 1 / f and the pulse width being in a picosecond order of the step time of the step recovery diode on the load; modulating an intensity modulator with the electric pulse signal, and outputting a laser pulse signal with the time domain interval same as that of the electric pulse signal and the pulse width similar to that of the electric pulse signal; then conducting pulse broadening, power amplification and pulse width compression on the laser pulse signal to obtain an ultra-short impulse sequence with the femtosecond pulse width and the evenly spaced time domain, taking the ultra-short impulse sequence as a repetition frequency accurate locking femtosecond laser light source to act on a terahertz generation device, and obtaining a repetition frequency accurate locking terahertz optical comb. According to the method, active adjustment of the terahertz comb tooth width is achieved through adjustment of an electrooptic modulator. The modulation accuracy of the terahertz comb tooth is high and the adjustable range is wide.
Owner:UNIV OF SHANGHAI FOR SCI & TECH
Scanner and batching supervisory system
InactiveCN103455772ASolve the technical problem of low modulation accuracyHigh modulation accuracySensing record carriersResourcesWireless routerDatabase server
The invention discloses a scanner and a batching supervisory system, and relates to the technical field of cigarette manufacturing. The technical problem of low preparation accuracy of flavors and fragrances in the prior art is solved. The scanner comprises a scanning module, a data processing module, a display screen and a data transceiving module. The data processing module is used for receiving weight data of single materials in containers, comparing the weight data with weight, specified by a base material formula, of the single materials and displaying weight comparison results of the single materials through the display screen. When the weight comparison results of the single materials show that the weight data of each single material in the base material formula used according to needs of a same batch of operation tasks are identical to weight, specified by the base material formula, of each single material, completion of the batch of operation tasks is displayed by the display screen. The batching supervisory system comprises the scanner, a database server, a computer workstation, a weighing device and a wireless router. The scanner and the batching supervisory system are applied to preparation process for monitoring base materials.
Owner:LONGYAN CIGARETTE FACTORY
Liquid crystal aberration correcting method without wavefront detection
InactiveCN109739033AControl refractive indexAdjust Alignment OrientationImage analysisStatic indicating devicesWavefrontLight spot
The invention discloses a liquid crystal aberration correcting method without wavefront detection. A used system comprises a liquid crystal aberration corrector, an image acquisition module, a convolutional neural network module and a grayscale conversion module. The specific method is as follows: the liquid crystal aberration corrector is used as an executing mechanism to correct distorted wavefront of received light; the image acquisition module is responsible for receiving light beams after liquid crystal correction, and acquiring the light beams as light spot images; after large-amount light spot data training, the convolutional neural network module is used for carrying out fitting according to the light spot images acquired by an imaging system to obtain Zernike coefficients corresponding to light spots; and finally, the grayscale conversion module is used for converting the Zernike coefficients obtained by fitting into grayscale values and controlling the liquid crystal aberration corrector to correct an aberration.
Owner:INST OF OPTICS & ELECTRONICS - CHINESE ACAD OF SCI
Calibrated PLL for wide band communication semiconductor integrated polar loop transmitter
ActiveUS7187911B2Improve accuracyAvoid transmissionResonant long antennasAmplitude modulation detailsFrequency spectrumSemiconductor chip
The invention provides a communication semiconductor integrated circuit (RF IC) that, when a transmission oscillator is incorporated into a semiconductor chip, secures the oscillation operation over a wide frequency range, prevents a deterioration of a transmission spectrum, and thereby enhances the accuracy of an oscillation frequency. The integrated circuit corrects a dispersion of the KV characteristic of the transmission oscillator by calibrating a current Icp of the charge pump inside the phase control loop. More in concrete, the integrated circuit measures a KV value Kv of the transmission oscillator, and calibrates the current Icp of the charge pump so that Kv·Icp falls into a predetermined value.
Owner:RENESAS CO CORP
Mobile communication terminal device
InactiveUS6282411B2High modulation accuracyImprove accuracyResonant long antennasTransmission noise reductionVoltage dropCarrier signal
A mobile communication terminal device of the present invention includes: a voltage detector for detecting a battery voltage at the time of a voltage drop; a correction phase storage section for storing pieces of correction phase information each having a characteristic opposite to that of a phase error in a carrier wave produced due to a drop in the battery voltage; a correction phase outputting section for selecting correction phase information based on the battery voltage at the time of the voltage drop and outputting the selected correction phase information to a baseband modulator to change phase information in a baseband signal; and a modulator for modulating a carrier wave according to the baseband signal output from the correction phase outputting section so as to cancel the phase error included in the carrier wave.
Owner:MITSUBISHI ELECTRIC CORP
High-voltage end current detection circuit
InactiveCN102360236ASolve the problem that the accurate detection of high-voltage terminal current cannot be realizedLow costElectric variable regulationExecution unitEngineering
The invention discloses a high-voltage end current detection circuit. The circuit comprises a mapping unit, a correction feedback unit, a modulation unit, an execution unit and a load, wherein the correction feedback unit comprises a resistance potential-divider network, a reference voltage unit, a subtraction unit, a first logarithm operation unit, a second logarithm operation unit, a current superposition unit, a voltage / current conversion unit and a summator. The current has the characteristics of high current detection accuracy, wide application range and low system cost.
Owner:SHANGHAI CONSONANCE ELECTRONICS
A Spaceborne Integrated Communication System Compatible with Microwave, Laser and Quantum Communication
ActiveCN103873151BSimple structureReduce volumePhotonic quantum communicationElectromagnetic transceiversStructure of Management InformationPolarizer
Owner:BEIJING RES INST OF TELEMETRY +1
Novel flat-topped light beam generating device
InactiveCN112817157AImprove uniformityHigh modulation accuracyNon-linear opticsOptical elementsImage resolutionLight beam
The invention relates to a novel flat-topped beam generating device, and belongs to the field of laser transmission and control. According to the novel flat-topped light beam generating device of the invention, a flat-topped beam shaping technical approach of combining a liquid crystal spatial light modulator and an aspherical lens group is adopted; the properties of high resolution and high modulation precision of the liquid crystal spatial light modulator are fully utilized, and the uniformity of a output flat-topped beam can be obviously improved through a closed-loop modulation method; moreover, the device has a light intensity uniformity automatic compensation function; in a laser transmission link, the device can carry out automatic compensation and correction for flat-topped light beam uniformity reduction caused by environmental pollution, optical element degradation, light imbalance of an optical structure and the like, so that the device is lower in working environment requirement, longer in service life and higher in quality reliability; in addition, the device can generate laser spots with different light intensity distributions in a modulation range according to needs, can be expanded and applied to other research fields, and is wider in application range.
Owner:SOUTH WEST INST OF TECHN PHYSICS
Three-dimensional displacement measurement system and method based on laser self-mixing grating interference
The invention discloses a three-dimensional displacement measurement system and method based on laser self-mixing grating interference, and the system comprises a semiconductor laser sensor head, a plane reflector, a reflective two-dimensional plane grating, a data acquisition card and a computer, wherein the laser emitted from the semiconductor laser sensor head is incident on the reflective two-dimensional grating, the corresponding diffracted light is fed back to the semiconductor laser sensor head along the original optical path to generate self-mixing interference, the self-mixing interference signal is converted into an electrical signal by the photodetector built in the semiconductor laser and is output to the data acquisition card to obtain three-dimensional displacement of the target to be measured after computer processing. The invention solves the problem that the range of a traditional grating interferometer is limited when performing out-of-plane displacement measurement,is more compact than the traditional grating interferometer, maintains the advantages of self-collimation of the laser self-mixing interferometer, and can realize three-dimensional real-time displacement measurement system and method with a simple structure, wide rang and high resolution.
Owner:NANJING NORMAL UNIVERSITY
Unmanned aerial vehicle surveillance reconnaissance system
PendingCN107390711AReduce power consumptionHigh modulation accuracyBatteries circuit arrangementsHigh frequency amplifiersElectric energyGround control station
Disclosed is an unmanned aerial vehicle surveillance reconnaissance system. The unmanned aerial vehicle surveillance reconnaissance system is connected with a control terminal through wireless network and comprises a flight processor, a servo mechanism driving an unmanned aerial vehicle to fly according to instructions of the flight processor, a first communication subsystem, a camera subsystem and a first processor and is characterized in that when a personnel moving is shot in a monitored area through the camera subsystem, the first processor sends card finding information to non-contact equipment worn by the moving personnel through the communication subsystem and search replay information, the moving personnel is judged to be a legal personnel is the replay information is received, or else the moving personnel is judged to be a suspicious personnel, and the non-contact equipment receives electromagnetic wave sent by the communication subsystem and generates electric energy to supply internal circuit power to itself. By the arrangement, the personnel in the monitored area can be identified to be the legal personnel or not with no need of participation of a personnel in a ground control station.
Owner:徐荣声
Broadband modulation PLL, and modulation factor adjustment method thereof
InactiveUS7236063B2High modulation accuracyLow costPulse automatic controlAngle modulation detailsLoop filterControl signal
A problem of the present invention is to provide a wide band modulation PLL having good modulation accuracy at low cost. With respect to a PLL having a VCO (21), a frequency divider (22), a phase comparator (23), a charge pump (24) and a loop filter (25), the VCO (21) and a frequency dividing ratio of the frequency divider (22) are controlled to perform modulation. The VCO (21) has two control terminals for PLL and modulation, and a control signal generation part (28) generates a control voltage Vtm of the VCO (21) based on phase modulation data and an input voltage Vtl to the control terminal for PLL. At the time of adjusting a modulation factor, the control voltage Vtm to the control terminal for modulation of the VCO (21) is controlled and also the input voltage Vtl is measured and a modulation sensitivity of a frequency of the VCO (21) to Vtm is calculated and a modulation factor of the phase modulation data is adjusted based on the modulation sensitivity obtained.
Owner:PANASONIC CORP
Low common mode vector modulation method and system for three-level SNPC inverter
PendingCN113783456ALow costReduce electromagnetic interferenceAc-dc conversionPhase currentsVoltage vector
The invention discloses a low common mode vector modulation method and system for a three-level SNPC inverter, and the method comprises the steps that a three-phase current is ssmpled, a reference voltage vector is obtained under an alpha-beta coordinate system, and a sector where the reference voltage vector is located is judged according to the value of a phase angle; a small vector is selected according to the sector where the reference voltage vector is located and the midpoint potential condition, and the action time of the small vector is adjusted through a PI controller; the action time of the large vector, the virtual medium vector and the zero vector is calculated; meanwhile, switch sequences of a coupling part and an independent part of the three-level SNPC inverter is separately designed, wherein the large vector, the small vector and the zero vector are low common mode vectors; and on-off of a power switch tube in the three-level SNPC inverter is controlled based on the action time and the switch sequence so as to control operation of the three-level inverter. According to the invention, the common-mode voltage is effectively suppressed, and the balance of the neutral-point potential is realized.
Owner:SHANDONG UNIV
Combination method of gamma components in three-level three-dimensional SVPWM (space vector pulse width modulation)
The invention discloses a combination method of gamma components in three-level three-dimensional SVPWM (space vector pulse width modulation). According to the method, based on three-level three-dimensional SVPWM, a two-dimensional vector space is divided into an outer-layer zone, a middle-layer zone and an inner-layer zone from outside to inside; different vectors are selected according to the features of vector combination in each zone to combine gamma components; the action time of positive and negative small vectors is calculated through adopting a more accurate method, and the accuracy of the combination of the gamma components can be improved. The method has the advantages of clear processes, simplicity and convenience in implementation, high efficiency, large modulation range and high modulation precision. The combination method of the invention can be realized in a digital controller easily.
Owner:中船鹏力(南京)新能源科技有限公司
High-efficiency LED (light emitting diode) driving circuit
ActiveCN103152946ALow costReduce volumeElectrical apparatusElectric light circuit arrangementDriving currentEngineering
The invention relates to a high-efficiency LED (light emitting diode) driving circuit, which is used for driving an LED device. The LED driving circuit comprises a control circuit, an LED current detection circuit and a power switch tube, wherein the LED current detection circuit is used for generating a feedback signal for representing a driving signal of the driving current of the LED device, the control circuit is connected with the LED current detection circuit, and is used for receiving the feedback signal and generating a PWM (pulse width modulation) driving signal, the power switch tube is used for receiving an input voltage source and the PWM driving signal, and is periodically conducted and cut off to drive the LED device, and the driving current of the LED device is maintained constant.
Owner:SILERGY SEMICON TECH (HANGZHOU) CO LTD
Light emitting unit, assembly, circuit, display device and backlight control method
ActiveCN111341273AImprove gray scale control abilityFlat current-voltage curveStatic indicating devicesDisplay deviceData signal
A light-emitting unit comprises a first switch tube, a second switch tube, an LED chip, a first storage capacitor and a first resistor, wherein the grid electrode of the first switch tube is a scanning signal; the source electrode of the first switch tube is a data signal; the positive electrode of the LED chip is a power supply signal input end; the drain electrode of the second switch tube is connected to the first end of the first resistor, and the second end of the first resistor is grounded. A resistor is added to be connected to a switching tube for driving an LED and is in series connection with the switching tube, so that a current-voltage curve of the switching tube becomes gentler, a corresponding new voltage control range becomes larger for the same current change range, modulation with higher precision can be realized, and the gray scale control capability for the LED is improved.
Owner:TCL CORPORATION
Self-calibrating modulator apparatuses and methods
InactiveUS7746187B2High precisionHigh modulation accuracySimultaneous amplitude and angle modulationAngle modulation detailsGain coefficientCalculator
A self-calibrating modulator apparatus includes a modulator having a controlled oscillator and an oscillator gain calibration circuit. The oscillator gain calibration circuit includes an oscillator gain coefficient calculator configured to calculate a plurality of frequency dependent oscillator gain coefficients from results of measurements taken at the output of the controlled oscillator in response to a test pattern signal representing a plurality of different reference frequencies. The plurality of frequency dependent gain coefficients determined from the calibration process are stored in a look up table (LUT), where they are made available after the calibration process ends to scale a modulation signal applied to the modulator. By scaling the modulation signal prior to it being applied to the control input of the controlled oscillator, the nonlinear response of the controlled oscillator is countered and the modulation accuracy of the modulator is thereby improved.
Owner:PANASONIC CORP
Light beam angle quick modulating device based on digital micro-lens device
The invention relates to a light beam angle quick modulating device based on a digital micro-lens device, wherein the light beam angle quick modulating device belongs to the designing field of a photoelectric device and a calculating imaging system. The light beam angle quick modulating device comprises the components of the digital micro-lens device which performs spatial position area gating modulation on an incident light beam; a beam expanding system which performs collimating beam expanding on the light beam that is emitted from the micro-lens device; a lens array and an object lens system which realize conversion from light beam spatial area gating modulation to angle two-dimensional modulation through focus superposing; and a diaphragm which realizes spatial shearing to the parallellight beam and acquires parallel light that is propagated in different angles with a specific area dimension. Through the quick spatial modulation characteristic of the digital micro-lens device andthe light field angle information acquisition capability of the lens array, the light beam angle quick modulating device has advantages of realizing a quick adjusting function for the two-dimensionalangle of the spatial light beam, realizing no restriction by the resonant frequency of a mechanical device, and realizing spatial light beam angle modulation and coding.
Owner:BEIJING INSTITUTE OF TECHNOLOGYGY +1
Display control system for spatial light modulators
InactiveUS20080074563A1Minimal reductionHigh precision outputTelevision system detailsStatic indicating devicesSpatial light modulatorControl system
A display control system, comprises: a spatial light modulator (SLM) constituted by a plurality of pixel elements placed in array; a first control unit for controlling each of the plurality of pixel elements under a state of ON or OFF; a second control unit for controlling each of the plurality of pixel elements under a state other than the ON or OFF states; a control changeover unit for dividing one frame period, for each pixel element of the plurality thereof, into a period of the first control unit controlling and that of the second control unit controlling, and also changing over between a control of the first control unit and that of the second control unit for each pixel element of the plurality thereof; and a data division unit for dividing input data to each of the plurality of pixel elements into first control unit-use data, which is input to the first control unit, and second control unit-use data which is input to the second control unit in accordance with the content of the present input data.
Owner:SILICON QUEST KABUSHIKI KAISHA +1
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