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66results about How to "Reduce Signal Error" patented technology
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Packet data transmitting method and mobile communication system using the same
ActiveUS20050249162A1Reduce signal errorImprove channel efficiencyError prevention/detection by using return channelNetwork traffic/resource managementSignal-to-noise ratio (imaging)Soft handover
A packet data transmitting method and mobile communication system using the same enables transmission of common ACK / NACK information from each sector of a base station to a user entity in softer handover. The method includes receiving via at least one of the plurality of sectors a data packet from the mobile terminal, the data packet being correspondingly received for each of the at least one of the plurality of sectors; combining the correspondingly received data packets, to obtain a signal having a highest signal-to-noise ratio; decoding the value obtained by the combining; determining a transmission status of the data packet according to the decoding; and transmitting to the mobile terminal a common ACK / NACK signal including one of a common ACK signal and a common NACK signal according to the determining, the common ACK / NACK signal being transmitted via each of the at least one sector.
Owner:3G LICENSING SA
Thermal power unit reheated steam temperature control method
ActiveCN101338892APrevent overshootReduce Signal ErrorSuperheating controlTemperature control using electric meansFeedback controlLoad following power plant
The invention relates to a thermal power generating unit reheated steam temperature controlling method. According to the operating characteristics of the boiler reheater and the theoretic study on a steam-temperature control system, a state feedback control method based on incremental state observer is adopted, and the concept of an algebraically equivalence observer is used to direct the parameter setting of an incremental state observer; in addition, a special control circuit is arranged in the steam-temperature control circuit to resolve the problems that the process of steam-temperature adjustment is relatively long when the reheated steam temperature set value is changed, non-linearity exists during steam-temperature control, the process of steam-temperature variation is very slow, etc., and variation parameter PID regulator is combined to jointly form a comprehensive reheated temperature automatic adjusting system. The invention is capable to ensure reheated steam temperature control to escape spray water upon large-range load variation, and effectively overcomes the disadvantage of the poor effect of the traditional PID regulation on the control of big lagged object; the reheated temperature control effect is improved remarkably; and a sample is provided for controlling the controlled object with big inertia and serious lagging in relation to reheated steam temperature.
Owner:CHINA ELECTRIC POWER RES INST +2
Packet data transmitting method and mobile communication system using the same
ActiveUS7394790B2Reduce Signal ErrorImprove efficiencyError prevention/detection by using return channelFrequency-division multiplex detailsSignal-to-noise ratio (imaging)Network packet
Owner:3G LICENSING SA
Double-frequency microstrip antenna
ActiveCN101916901AReduce Signal ErrorHigh precisionRadiating elements structural formsElectrically short antennasDouble frequencyFeed network
The invention discloses a double-frequency microstrip antenna, which comprises an upper-layer microstrip antenna with an upper-layer paster, a lower- layer of microstrip antenna with a lower-layer paster and a feed network located at the bottom layer. The geometric center of the upper-layer paster is provided with an upper-layer central hole, the geometric center of the lower-layer paster is provided with a lower-layer central hole, the double-frequency microstrip antenna is also provided with a short circuit pin which is connected with an earth wire of the feed network after sequentially penetrating into the upper-layer microstrip antenna from the upper-layer central hole and penetrating into the lower-layer microstrip antenna from the lower-layer central hole, and the short circuit pin is respectively electrically connected with the upper-layer paster and the lower-layer paster. In the invention, through fixing the geometric center of the upper-layer paster and the geometric center of the lower-layer paster together and connecting the upper-layer paster and the lower-layer paster with the earth wire of the feed network by the short circuit pin, the invention can stabilize the phase centers of the two frequency-band signals received by the double-frequency microstrip antenna, thereby reducing signal error of the double-frequency microstrip antenna and improving the signal receiving precision of the double-frequency microstrip antenna.
Owner:GUANGZHOU HI TARGET SURVEYING INSTRUMENT CO LTD
Atmospheric environment monitoring system based on big data
ActiveCN110057986AEasy to adjustImprove reliabilityGas analyser construction detailsCapacitancePush pull
The invention discloses an atmospheric environment monitoring system based on big data. The atmospheric environment monitoring system includes a frequency collection circuit, detection calibration circuits and a filter transmitting circuit; a signal frequency of a simulated signal transmission channel input end is collected by the frequency collection circuit; a disturbing signal filter circuit composed of an operational amplifier AR2, an operational amplifier AR3 and a capacitor C4 is used by a first circuit of the detection calibration circuits to filter out disturbing signals; a triode Q5 is used by a second circuit of the detection calibration circuits to detect abnormal high level signals, and at the same time, an amplitude limiting circuit composed of a diode D3 and a diode D4 is used to limit signals; and finally, a signal conduction loss is decreased by the two circuit signals through a push-pull circuit composed of a triode Q3 and a triode Q4. According to the atmospheric environment monitoring system based on the big data, a filter circuit composed of an inductance L3, a capacitor C10 and a capacitor C11 is used by the filter transmitting circuit to filter out signals, sothe accuracy of corrected signals is ensured, the reliability of terminal error correction controlled by the atmospheric environment monitoring system is improved.
Owner:ZHENGZHOU INST OF TECH
Training a Memory Controller and a Memory Device Using Multiple Read and Write Operations
InactiveUS20110307671A1Reduce Signal ErrorSpeedLogic circuit coupling arrangementsReliability increasing modificationsControl storeMemory controller
Systems and methods to set a voltage value associated with a communication bus that includes memory controller coupled to a memory device are disclosed. A particular method may include performing a first calibration operation associated with first data written from a memory controller to a memory device. A second calibration operation may be associated with second data read at the memory controller from the memory device. The operating parameter may be set based on a result of at least one of the first and the second calibration operations at the memory device or the memory controller.
Owner:IBM CORP
Household video monitoring system
InactiveCN109889795AImprove reliabilityEnsure consistencyClosed circuit television systemsVideo monitoringCapacitance
The invention discloses a household video monitoring system. The system comprises a frequency acquisition circuit 1, a frequency acquisition circuit 2, a rectification calibration circuit and a filtering output circuit. The frequency acquisition circuit 1 and the frequency acquisition circuit 2 respectively acquire analog signals at the input end and the output end of a signal transmission channelin a control terminal of the household video monitoring system. The rectification calibration circuit uses a variable resistor RW1, a capacitor C4, and a capacitor C3 to form a rectifying circuit torectify the signal, and uses a diode D6-diode D9 and an amplifier AR1 to form a composite circuit for signal limiting, amplification, and limiting processing. The frequency acquisition circuit 2 usesthe op amp AR2-AR4 and the capacitor C14 to form a loss compensation circuit to compensate the output signal of the rectification and calibration circuit. Finally, the filter output circuit uses the inductor L2, the capacitor C10, and the capacitor C11 to form a [pi]-type filter circuit. The filtered output can convert the signal frequency into a compensation signal of the signal at the output endof the signal transmission channel in the control terminal of the home video monitoring system.
Owner:ๅฏ่้
Torque signal compensation circuit of four-wheel driven system of electric automobile
InactiveCN109849681AReduce Signal ErrorSpeed controllerElectric energy managementCapacitancePeak value
The invention discloses a torque signal compensation circuit of a four-wheel driven system of an electric automobile. The torque signal compensation circuit of the four-wheel driven system of the electric automobile comprises a torque signal collecting circuit, a detection calibration circuit and a frequency selection output circuit. The torque signal collecting circuit uses a torque sensor J1 with the model number being TQ-663 to collect the torque signal when the four-wheel driven system of the electric automobile works, the detection calibration circuit receives output signals of the torquesignal collecting circuit in two ways, the first way uses an operational amplifier device AR1, an operational amplifier AR2 and a variable resistance R3, capacitance C4 to form a peak value detectioncircuit to detect the signals, the second way uses controllable silicon VTL1 and a voltage-regulator tube D7 to form an abnormal signal detection circuit, the abnormal signals are fed back into the frequency adjustment circuit to adjust the output signal frequency of the frequency adjustment circuit, finally the frequency selection output circuit uses resistance R 14-resistance R 16 and capacitance C13-capacitance C15 to form a double-T frequency selection circuit to screen the signals with signal frequency, automatic frequency adjustment and calibration can be conducted on the torque signalin a signal transmission module in the four-wheel driven system of the electric automobile, and the error range of the signal is shortened.
Owner:้่พ
Digital information reproduction method
InactiveUS20090106627A1Reduce Signal ErrorImprove reliabilityModification of read/write signalsRecord information storageComputer hardwareSignal quality
An optical disc using super-resolution effects that achieves higher-density recording exceeding the optical resolution suffers from the signal-quality degradation caused by the normal resolution component included in the reproduction signal. To address this problem, a data reproduction method is provided. In the method, characteristic error patterns are identified and parity check codes in conformity with run-length limited coding are used to carry out efficient and reliable error correction. Error patterns caused by the normal resolution crosstalk are localized in the leading edges of a mark following a long space and in the trailing edges of a long mark. Whether an error exists in the data is determined by use of the parity check codes. When an error occurs, a pattern in which an error is most likely to occur is selected from the above-mentioned patterns by taking account of the edge shift direction, and then the error therein is corrected.
Owner:HITACHI CONSUMER ELECTRONICS CORP
Indoor 3D (3-dimensional) dimension measurement method
InactiveCN102230785AImprove efficiencySignal error attenuationUsing optical meansLeast squaresThree Dimensional Size
The invention provides an indoor 3D dimension measurement method, which comprises the following steps of: setting up a coordinate system in an indoor 3D space and converting the distances and angles of sampling points into coordinates and describing the coordinates; adopting curve fitting based on the least square method to carry out fitting of the sampling points; according to the fitting results, judging the wall surface quality in the measurement direction in real time, and building up a geometric frame in the indoor space according to the combination of various scanning layers; and completing the measurement according to the corresponding 3D dimensions which need to be calculated. The invention can quickly and precisely complete the indoor 3D dimension measurement (including the irregular geometric measurements) and has high measurement precision and efficiency. In addition, because of not setting strict requirements for machine platforms, hardware, motion control and programming,the measurement method is quite easy to implement and quite applicable to the characteristics of extension, development and utilization of intelligent instruments and related applications.
Owner:SHANGHAI UNIV
Training a memory controller and a memory device using multiple read and write operations
InactiveUS8681571B2Reduce Signal ErrorSpeedLogic circuit coupling arrangementsReliability increasing modificationsComputer hardwareMemory controller
Systems and methods to set a voltage value associated with a communication bus that includes memory controller coupled to a memory device are disclosed. A particular method may include performing a first calibration operation associated with first data written from a memory controller to a memory device. A second calibration operation may be associated with second data read at the memory controller from the memory device. The operating parameter may be set based on a result of at least one of the first and the second calibration operations at the memory device or the memory controller.
Owner:IBM CORP
Method, equipment and system for feeding back signal error in multi-carrier communication system
InactiveCN101674165AIncrease capacityIncrease speedError prevention/detection by using return channelTransmission path divisionCommunications systemCarrier signal
The invention discloses a method, equipment and a system for feeding back a signal error in a multi-carrier communication system, which relate to the field of communication systems, and solve the problem that the signal error cannot be promptly fed back under the condition of limited bandwidth of a feedback channel in the prior art. The embodiment of the invention determines a specific subcarrierspacing first, and feeds back the signal error according to the specific subcarrier spacing at a client, thus the signal error does not need to be fed back in each subcarrier, the feedback data amountis reduced, and the feedback channel cannot be blocked, thereby realizing the aim of promptly feeding back the signal error. The embodiment of the invention is used in the multi-carrier communicationsystem which comprises an xDSL communication system and various wireless communication systems, such as a mobile communication system.
Owner:HUAWEI TECH CO LTD
Optical Transmission Equipment and Method for Controlling Thereof
InactiveUS20080310855A1Reduce Signal ErrorWavelength-division multiplex systemsDistortion/dispersion eliminationLength waveTransmission equipment
The optical transmission equipment includes: a demultiplexer for demultiplexing a transmitted wavelength-multiplexed optical signal to first and second optical signals; a first variable dispersion compensation unit; a second variable dispersion compensation unit; a first error detector; a second error detector; and a dispersion compensation control unit for controlling dispersion compensation amounts of the first and second variable dispersion compensation units based on the detection result of the first or second error detector. Upon detection of a signal error in the first optical signal, the first variable dispersion compensation unit is controlled to change from a first compensation amount to a third compensation amount, and the second variable dispersion compensation unit is controlled to change from a second compensation amount to a fourth compensation amount.
Owner:HITACHI LTD
Clock jitter estimation and correction method for data acquisition in rotating environment
ActiveCN112564707AImprove accuracyReduce Signal ErrorAnalogue-digital convertersEngineeringReal-time computing
The invention discloses a clock jitter estimation and correction method for data acquisition in a rotating environment, which performs jitter distribution estimation by combining a sampling clock signal and an external clock input signal in a wireless transmission mode, and directly estimates a clock jitter amount by utilizing a signal-to-noise ratio of clock signal acquisition data. Interpolationcorrection is performed according to the jitter amount estimation result, so that the problem of data acquisition errors caused by serious jitter of an external clock input signal of the data acquisition system in a rotating environment is solved, the phase error of the external clock input signal is reduced, and the precision and accuracy of data acquisition are improved. Compared with the priorart, the method has the advantages of multi-channel acquisition, comprehensive jitter amount estimation and the like, can obviously reduce external clock jitter, and is also suitable for improving external clock input stable transmission of a data acquisition system.
Owner:LOW SPEED AERODYNAMIC INST OF CHINESE AERODYNAMIC RES & DEV CENT
Signal calibration circuit for industrial building fire fighting system
ActiveCN110658805AImprove anti-interference abilityEnsure consistencyProgramme controlElectric testing/monitoringCapacitanceIndustrial construction
The invention discloses a signal calibration circuit for an industrial building fire fighting system. The signal calibration circuit for the industrial building fire fighting system comprises a frequency acquisition circuit, a mean push-pull circuit and a filtering emission circuit; the frequency acquisition circuit acquires a signal frequency of an input end in an analog signal transmission channel in a signal transmission module of the industrial building fire fighting system; a first path of the mean push-pull circuit applies an operational amplifier AR1 to follow up a signal, and a secondpath of the mean push-pull circuit applies an operational amplifier AR4 and a triode Q3 as well as a capacitor C2 to form a noise reduction circuit to reduce a signal-to-noise ratio; then an operational amplifier AR2 is applied to carry out addition processing on two paths of signals; an output signal of the operational amplifier AR2 is input into a mean circuit consisting of an operational amplifier AR3 and a diode D2 as well as a diode D3; the filtering emission circuit applies an inductor L2 and a capacitor C4 as well as a capacitor C5 to form a filtering circuit to carry out filtering on the signal; the filtered signal is sent into a control terminal of the industrial building fire fighting system through a signal emitter E1; and after being automatically calibrated, the signal is converted into an error correction signal of the control terminal of the industrial building fire fighting system.
Owner:TIANJIN SHENGDAN ELECTRONICS TECH DEV
Setting a Reference Voltage in a Memory Controller Trained to a Memory Device
InactiveUS20110307717A1Extension of timeReduce Impedance MismatchEnergy efficient ICTReliability increasing modificationsComputer hardwareElectronic communication
Systems and methods to set a voltage value associated with a memory controller coupled to a memory device are disclosed. A particular method includes comparing test data of a test path to functional data of a functional path. The functional data may be generated based on device data received at a memory controller from a memory device. The test data may be affected by a voltage value applied to a resistor arrangement in electronic communication with the test path. The voltage value may be applied to the resistor arrangement based on the comparison.
Owner:IBM CORP
Hall integrated chip for horizontal direction detection
ActiveCN119255694Aimprove signal-to-noise ratioImprove stabilityCurrent measurements onlyVoltage/current isolationInterference resistanceSoftware engineering
The invention relates to the technical field of semiconductors, in particular to a Hall integrated chip for horizontal detection, which comprises a first Hall chip and a second Hall chip, the first Hall chip and the second Hall chip are adjacently arranged, and the output end of the first Hall chip and the output end of the second Hall chip are connected in parallel. Positive and negative potentials generated by the first Hall chip and the second Hall chip under the interference of a vertical magnetic field offset each other, the first Hall chip is provided with a first magnetism gathering structure, the second Hall chip is provided with a second magnetism gathering structure, target edges of the first magnetism gathering structure and the second magnetism gathering structure in the vertical direction are zigzag, and target edges of the first magnetism gathering structure and the second magnetism gathering structure in the vertical direction are zigzag. The angles, deviating from the vertical direction, of the first magnetism gathering structure and the second magnetism gathering structure on the target edge in the vertical direction are both 0-10 degrees. The Hall integrated chip for horizontal detection provided by the invention is simple in production process, relatively high in anti-interference capability, relatively large in measuring range and relatively high in detection precision.
Owner:SUZHOU JUZHEN PHOTOELECTRIC
Computer security risk control system
InactiveCN110084073AFrequency stabilityPrevent frequency hoppingInternal/peripheral component protectionCapacitanceAutomatic frequency control
The invention discloses a computer security risk control system. The system comprises a frequency acquisition circuit, a feedback calibration circuit and a frequency selection compensation circuit, wherein the frequency acquisition circuit acquires a signal in an input end of a signal transmission channel for receiving an analog signal by a control terminal in the computer security risk control system; the feedback calibration circuit uses a frequency modulation circuit composed of a triode Q1, a capacitor C2 and a capacitor C3 to perform frequency modulation on a signal, uses an amplitude modulation circuit composed of a triode Q2, an inductor L1, an inductor L2, a capacitor C6 and a capacitor C7 for carrying out amplitude modulation on signals, uses a constant current source circuit composed of a triode Q4, a triode Q5 and a capacitor C9 for carrying out voltage stabilization and then inputting the signals into a frequency selection compensation circuit. Finally the frequency selection compensation circuit uses resistors R16-R18 and capacitors C12-C14 to form a frequency selection circuit to screen out signal output of a single frequency. Automatic frequency modulation and calibration can be carried out on signals in the input end of a signal transmission channel used for receiving analog signals by the control terminal in the computer safety risk control system, and signal errors are reduced.
Owner:ZHENGZHOU INST OF TECH
Thermal power unit reheated steam temperature control method
ActiveCN101338892BPrevent overshootReduce Signal ErrorSuperheating controlTemperature control using electric meansFeedback controlPower unit
The invention relates to a thermal power generating unit reheated steam temperature controlling method. According to the operating characteristics of the boiler reheater and the theoretic study on a steam-temperature control system, a state feedback control method based on incremental state observer is adopted, and the concept of an algebraically equivalence observer is used to direct the parameter setting of an incremental state observer; in addition, a special control circuit is arranged in the steam-temperature control circuit to resolve the problems that the process of steam-temperature adjustment is relatively long when the reheated steam temperature set value is changed, non-linearity exists during steam-temperature control, the process of steam-temperature variation is very slow, etc., and variation parameter PID regulator is combined to jointly form a comprehensive reheated temperature automatic adjusting system. The invention is capable to ensure reheated steam temperature control to escape spray water upon large-range load variation, and effectively overcomes the disadvantage of the poor effect of the traditional PID regulation on the control of big lagged object; the reheated temperature control effect is improved remarkably; and a sample is provided for controlling the controlled object with big inertia and serious lagging in relation to reheated steam temperature.
Owner:CHINA ELECTRIC POWER RES INST +2
Controllable small-signal voltage source plate
InactiveCN106054996ASmall temperature driftLow noiseElectric variable regulationMicrocontrollerMicrocomputer
Owner:WUXI TONGXIANG TECH
Torque monitoring system of four-wheel-drive system of electric automobile
InactiveCN109849682AReduce Signal ErrorStable push-pull output signal amplificationSpeed controllerElectric energy managementCapacitancePush pull
The invention discloses a torque monitoring system of a four-wheel-drive system of an electric automobile. The torque monitoring system of the four-wheel-drive system of the electric automobile comprises a torque signal collection circuit, a push-pull frequency modulation circuit and a limiting filtering circuit; the torque signal collection circuit uses a torque sensor J1 with model of TQ-663 tocollect a torque signal during the working of the four-wheel-drive system of the electric automobile; the push-pull frequency modulation circuit uses a triode Q1 and a triode Q2 to form a push-pull circuit to receive a signal output by the torque signal collection circuit and uses resistors R13-R15 and capacitors C5-C7 to form a double T frequency selection circuit to screen a signal with single frequency; and finally, the limiting filtering circuit uses a diode D5 and a diode D6 to form a switch circuit to limit the signal and uses an inductor L1 and a capacitor C9 and a capacitor C10 to forma Pi-type filtering circuit to filter the signal and output the filtered signal. A torque signal in a signal transmission module of the torque monitoring system of the four-wheel-drive system of theelectric automobile can be automatically frequency-modulated and calibrated, and the signal is compensated to prevent frequency hopping and attenuation phenomenon of the signal.
Owner:้่พ
Micro-area scanning imaging device and measuring method
The invention discloses a micro-area scanning imaging device and a measuring method. The micro-area scanning imaging device comprises a laser, a double-axis scanning galvanometer SM, a cubic beam splitter CB and a microscope objective OB, wherein the double-axis scanning galvanometer SM gathers laser on a sample S. The cubic beam splitter CB splits signal light reflected after the laser irradiates the sample S to a sample signal detector SD; a plate-shaped beam splitter PB is also arranged between the cubic beam splitter CB and the sample signal detector SD, so that the signal light is further split to the laser detector PD; in the measurement process, a two-dimensional characteristic optical signal graph of the surface of a sample S is obtained based on a sample signal detector SD, then a blank substrate is placed in a to-be-measured area, a two-dimensional reflected light signal graph in the same area as the sample S on the substrate is obtained based on a laser detector PD, the two-dimensional characteristic optical signal graph is subjected to normalization processing based on the two-dimensional reflected light signal graph, and the normalized two-dimensional characteristic optical signal graph is obtained. And obtaining a normalized two-dimensional characteristic optical signal graph, and further drawing a two-dimensional space scanning graph of the physical properties of the sample S. The device and the method are suitable for signal acquisition of fluorescence spectrum, Raman spectrum, second harmonic and the like, and high-resolution imaging of various material microcells is realized by performing two-dimensional laser scanning on the surface of a sample.
Owner:NANJING UNIV
Setting a Reference Voltage in a Memory Controller Trained to a Memory Device
InactiveUS20120224436A1Extension of timeReduce Impedance MismatchEnergy efficient ICTDigital data processing detailsComputer hardwareElectronic communication
Systems and methods to set a voltage value associated with a memory controller coupled to a memory device are disclosed. A particular method includes comparing test data of a test path to functional data of a functional path. The functional data may be generated based on device data received at a memory controller from a memory device. The test data may be affected by a voltage value applied to a resistor arrangement in electronic communication with the test path. The voltage value may be applied to the resistor arrangement based on the comparison.
Owner:INT BUSINESS MASCH CORP
Double-frequency microstrip antenna
ActiveCN101916901BReduce Signal ErrorHigh precisionRadiating elements structural formsElectrically short antennasEngineeringDouble frequency
The invention discloses a double-frequency microstrip antenna, which comprises an upper-layer microstrip antenna with an upper-layer paster, a lower- layer of microstrip antenna with a lower-layer paster and a feed network located at the bottom layer. The geometric center of the upper-layer paster is provided with an upper-layer central hole, the geometric center of the lower-layer paster is provided with a lower-layer central hole, the double-frequency microstrip antenna is also provided with a short circuit pin which is connected with an earth wire of the feed network after sequentially penetrating into the upper-layer microstrip antenna from the upper-layer central hole and penetrating into the lower-layer microstrip antenna from the lower-layer central hole, and the short circuit pin is respectively electrically connected with the upper-layer paster and the lower-layer paster. In the invention, through fixing the geometric center of the upper-layer paster and the geometric center of the lower-layer paster together and connecting the upper-layer paster and the lower-layer paster with the earth wire of the feed network by the short circuit pin, the invention can stabilize the phase centers of the two frequency-band signals received by the double-frequency microstrip antenna, thereby reducing signal error of the double-frequency microstrip antenna and improving the signal receiving precision of the double-frequency microstrip antenna.
Owner:GUANGZHOU HI TARGET SURVEYING INSTRUMENT CO LTD
Nozzle driving circuit for inkjet printers
ActiveCN102653168AImprove printing qualityReduce Signal ErrorOther printing apparatusFeedback circuitsAnalog signal
The invention discloses a nozzle driving circuit for inkjet printers, comprising a drive signal generating circuit, a D / A (Digital / Analogue) switching circuit, a power amplifying circuit and a self-check feedback circuit, wherein the drive signal generating circuit is used for outputting digital signals of a drive voltage; the D / A switching circuit is used for converting the digital signals of the drive voltage output by the drive signal generating circuit, into analogue signals; the power amplifying circuit is used for amplifying the analogue signals of the drive voltage subjected to the conversion of the D / A switching circuit; the self-check feedback circuit is used for checking whether a nozzle driving voltage is output in a preset linear mode or not after the amplification of the power amplifying circuit; and the amplified drive voltage is compared with a drive voltage obtained through theoretical calculation and the comparative result is fed back to the drive signal generating circuit to ensure that the output digital signals of the drive voltage can be adjusted according to the comparative result through the drive signal generating circuit. According to the invention, the signal error is reduced through carrying out self-check and feedback on the nozzle driving voltage, therefore, the printing quality of the inkjet printers is improved.
Owner:BEIJING MEIKEYI
Mutual capacitance touch sensing device
ActiveUS9405421B2Reduce in quantitySave equipment spaceInput/output processes for data processingTouch SensesEngineering
Owner:APPLE INC
Method for measuring dye sensitized solar battery conversion efficiency and mono-wavelength quantum efficiency
InactiveCN100533077CAvoid scatterSmall attenuationSpectrum investigationElectrical testingIntegratorReference current
The method for measuring the conversion efficiency of a dye-sensitized solar cell and the single-wavelength quantum efficiency comprises the following steps: determining the size of the light-receiving area of โโthe dye-sensitized nano-thin film solar cell, building a balanced bridge compensation circuit, and obtaining a current-voltage curve, which is obtained directly through a computer program Open-circuit voltage, short-circuit current, fill factor, conversion efficiency and other parameters; under the same monochromatic light conditions, measure the short-circuit current signals of the standard reference cell with known parameters and the experimental dye-sensitized nano-thin film solar cell, and compare the two Comparing calculations, the single-wavelength external quantum efficiency of the experimental dye-sensitized nano-thin film solar cell is obtained; an integrating sphere is placed at the spatial position before the dye-sensitized solar cell receives light for light integration, and the short-circuit current signal is measured, which is compared with the current of the standard reference cell The signals were compared and calculated to obtain the single-wavelength internal quantum efficiency of the experimental dye-sensitized nano-thin film solar cell.
Owner:NANJING UNIV
Compact folded Y-junction waveguide
ActiveUS9666927B1High bandwidthReduce Signal ErrorWaveguidesCoupling devicesHigh bandwidthElectrical impedance
A high bandwidth, low signal error, compact waveguide includes a conductive body including a waveguide input portion and a plurality of waveguide output portions disposed coplanar with the input waveguide portion. The waveguide further includes a common junction joining the input waveguide portion and the plurality of output waveguide portions. A septum is disposed proximate the common junction collinear with a centerline of the input waveguide portion. The waveguide further includes a plurality of iris elements disposed proximate the common junction transverse to the centerline of the input waveguide portion. The septum and the plurality of iris elements changes an impedance of the common junction to match the impedance across the entire waveguide bandwidth.
Owner:THE UNITED STATES OF AMERICA AS REPRESETNED BY THE SEC OF THE AIR FORCE
Digital-predistortion-based sampled signal processing system
InactiveCN102565481ASolve the problem of real-time impactReduce Signal ErrorElectrical measurement instrument detailsElectrical testingDigital signal processingClosed loop
The invention discloses a digital-predistortion-based sampled signal processing system. The system comprises a reference signal source, an analog front end, digital-to-analog converters, time-domain equalizers, filters and a signal chain compensation controller which are connected through circuits to form a closed-loop circuit. A digital-predistortion-based signal chain compensation technology is applied to a digital signal processing system, so that the signal error can be remarkably reduced, the input bandwidth can be improved, and the problem about performance degradation caused by the inconsistency of circuits of a high-speed signal sampling system can be solved; and the problem that the signal chain compensation technology affects the real-time performance of an oscilloscope is solved due to the application of a high-speed signal processing technology.
Owner:JIANGSU LVYANG ELECTRONICS INSTR GROUP
Quantitative determination method for medium-chain triglycerides in tobacco breakable bead solvent
ActiveCN110333306AImprove extraction efficiencyReduce Signal ErrorComponent separationDichloromethaneQuantitative determination
The invention relates to a quantitative determination method for medium-chain triglycerides in a tobacco breakable bead solvent, and belongs to the field of tobacco additive component physical and chemical analysis. The quantitative determination method for medium-chain triglycerides in the tobacco breakable bead solvent comprises the following steps of carrying out mixing and extracting on crushed tobacco breakable beads, an extracting agent and an internal standard substance, and taking the supernate to carry out GC-FID measurement, and performing quantifying by an internal standard method,wherein the extracting agent is ethanol, acetone or dichloromethane. According to the method disclosed by the invention, the quantitative detection of the four components of the medium-chain triglycerides in the cigarette breakable bead solvent is realized for the first time, and the method has the advantages of being low in detection cost, rapid in detection, high in sensitivity and high in accuracy, and is suitable for quantitative detection of medium-chain triglycerides in the cigarette breakable beads and commercial medium-chain triglycerides.
Owner:ZHENGZHOU TOBACCO RES INST OF CNTC