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52results about How to "Improve monotonicity" patented technology
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Fine step and large gain range programmable gain amplifier
ActiveUS7098738B2Improve signal-to-noise ratioAmplificationGain controlAmplifier with semiconductor-devices/discharge-tubesVariable-gain amplifierAudio power amplifier
A programmable gain amplifier with three stages uses fine steps, has a large gain range, and is monotonic. The first stage comprises several amplifiers, each including a resistive feedback loop. The feedback loop comprises a series of resistors, with each resistor acting as a tap. Since the number of resistors in the loop is unchanging, monotonicity and stability is guaranteed when resistance is increased using successive taps. A switch system connects two taps at a time to an interpolation stage. Each of these taps corresponds to a specific resistor level, and thus a gain level. The interpolation stage uses a plurality of current sources inside a feedback amplifier to control the interpolation, in order to provide fine gain steps.
Owner:AVAGO TECH INT SALES PTE LTD
Multi-stage automatic focusing method according to time-frequency domain catched by iris picture
InactiveCN1892401AReduce fatigueGood monotonicityCharacter and pattern recognitionFocusing aidsImage resolutionDistinctness of image
The present invention discloses multistage irides image automatical focusing method combining frequency domain and time domain, method key being the image definition. It contains judging aerodynamic center position through image resolution evaluation function, driving executing structure adjusting optical system focus point to form one automatical focusing closed loop control system. Said Automatical focusing process includes two stages: rough focusing stage adopting downsampling FFT low frequency coefficient evaluation procedure determining search direction and focus point adjacent region; fine focusing stage adopting global gradient sum evaluation procedure accuracy positioning focus point. Optimized control strategy uses improved blindman hill climbing method hill climbing method to execute stepwise image evaluation procedure, adopting different scouting speed further raising said invention real time property. Said invention overcomes tradition single evaluation procedure shortage, capable of realizing rapid and precise focusing.
Owner:NANJING UNIV
Image definition evaluation method, automatic focusing method and corresponding devices
ActiveCN106934790AIncrease spikesImprove monotonicityImage analysisAlgorithmComputer graphics (images)
The embodiment of the invention relates to an image definition evaluation method, an automatic focusing method and corresponding devices which are used for solving a problem that an image definition evaluation method in the prior art cannot adaptively improve the properties such as peak and monotonicity of an image definition evaluation function. According to the invention, the value range of a mapping relation between a brightness value and a definition evaluation value of each initial detail block can be determined in an adaptive manner according to the brightness value and the definition evaluation value of each initial detail block under different external illumination brightness in each scene; when automatic focusing is required to be performed, at least one brightness range value corresponding to each sub-block is determined according to the predetermined value range of the mapping relation and a current definition evaluation value of the sub-block, whether the current sub-block is a evaluation detail block or not is judged according to a current brightness value corresponding to the sub-block, and different weights are respectively given to evaluation detail blocks and non evaluation detail blocks, so that the interference such as noise and brightness can be eliminated, and adaptive improvement for the properties such as the peak and monotonicity of the image definition evaluation function is realized.
Owner:ZHEJIANG DAHUA TECH CO LTD
Mechanical rotating part performance degradation tracking method based on multi-feature fusion
InactiveCN111680661AImprove monotonicityImprove robustnessCharacter and pattern recognitionNeural architecturesData setAlgorithm
The invention discloses a mechanical rotating part performance degradation tracking method based on multi-feature fusion, and relates to a mechanical rotating part performance degradation tracking method. The objective of the invention is to solve the problems that an existing performance degradation tracking method cannot comprehensively and accurately describe all state information of a mechanical rotating part and cannot provide effective reference data for performance degradation of the mechanical rotating part. The method comprises the following steps: 1, acquiring degradation data of a mechanical rotating part; 2, extracting a plurality of features from the original vibration signal of the mechanical rotating part; 3, calculating the correlation, monotonicity, robustness and comprehensive indexes of the extracted features, and screening eight features with the highest comprehensive index value to form a sensitive feature data set; and step 4, constructing an LSTM network, inputting the sensitive feature data set screened in the step 4 into the LSTM network, and performing multi-feature fusion to obtain a fusion feature LSTM-HI which is the health factor. The method is used for mechanical rotating part performance degradation tracking.
Owner:HARBIN INST OF TECH
Meaty instant soup bases of sauce residue
The invention discloses meaty instant soup bases of sauce residues. The soup bases take the sauce residues as a main raw material and comprise the following components by weight in mixture ratio: 95 to 105 parts of sauce residues, 6 to 10 parts of minced meat, 25 to 35 parts of oil, 1 to 3 parts of fermented glutinous rice wine or / and cooking wine, 4 to 6 parts of scallion, 1.2 to 1.4 parts of ginger, 2 to 3 parts of pickled chilli, 25 to 35 parts of bone soup, 3 to 3.6 parts of Maillard reaction substrate, 0 to 2.5 parts of auxiliary material for flavor treating and flavoring and salt, wherein the sauce residues need to be pulverized, milled and sieved by a sieve of 75 to 85 meshes. During manufacturing, the minced meat and the sauce residues are firstly stir-fried, then the stir-fried sauce residues, the stir-fried minced meat, the bone soup and the Maillard reaction substrate are boiled at the temperature of 90 to 120 DEG C for 40 to 60 minutes, then the salt is added for preparation after a Maillard reaction is finished, and finally, the product is filled, sterilized, cooled and formed. The invention can utilize the discarded sauce residues fully, and the prepared soup bases have natural flavor and abundant nutrition.
Owner:CHENGDU UNIV
Distributed storage control method based on virtual ring load balancing algorithm
The invention discloses a distributed storage control method based on a virtual ring load balancing algorithm. By introducing a consistent hashing algorithm, the change of the number of data items caused by increased nodes can be reduced, and the monotonicity can be improved; and by introducing a virtual ring and a historical modulus table, the problem of data movement caused by the change of the number of storage nodes can be avoided. According to the method disclosed by the invention, the impact of the storage medium size on data mapping can be eliminated, and good redundancy characteristics and high scalability of the cloud storage capacity can be achieved on the basis of ensuring load balancing.
Owner:TONGREN POWER SUPPLY BUREAU
Digital-to-analog converter and method thereof
ActiveUS7492297B2Improve monotonicityElectric signal transmission systemsDigital-analogue convertorsData controlDigital analog converter
A digitally controlled analog circuit comprises a finite state machine configured for receiving a digital input word and generating at least two digital codes in a manner determined by a state of the finite state machine. The digital codes are decoded into respective sets of binary data. The sets of binary data control respective switched-circuit arrays to generate an analog output corresponding to the digital input word. To establish a monotonic function between the digital input word and the analog output during steady state operations, the finite state machine switches states when a wrap-around condition is detected for one of the digital codes. The finite state machine uses different sets of equations in different states to derive the digital codes.
Owner:REALTEK SEMICON CORP
Method for surface decoration of metal and plastic composite piece
The invention discloses a method for surface decoration of a metal and plastic composite piece. The method comprises the following steps of: pretreating the metal and plastic composite piece; spraying photoimageable sand blast-resist ink onto the surface of the metal and plastic composite piece by using a compressed air spray gun, drying until the surface of the photoimageable sand blast-resist ink is dry and cannot stick films, cooling, placing a film on which a decorative pattern is drawn on the photoimageable sand blast-resist ink and exposing, and developing; performing sand blast treatment on the developed surface of the metal and plastic composite piece by using a sand blasting machine to ensure that areas which are not protected by the ink become frosted surfaces; anodizing the metal and plastic composite piece; spraying computerized numerical control (CNC) ink on the metal and plastic composite piece, and drying by using an ultraviolet (UV) photocuring machine; performing CNC cutting on the metal and plastic composite piece, and edging and polishing positions where the CNC ink is not coated; and removing the photoimageable sand blast-resist ink and the CNC ink from the metal and plastic composite piece by using a neutral deinking agent.
Owner:金甲化工企业(中山)有限公司
High resolution digital analog conversion circuit
ActiveUS7773009B2High resolutionImprove monotonicityElectric signal transmission systemsDigital-analogue convertorsDigital analog converterImage resolution
To increase the accuracy and resolution of an m bit digital analog converter, n bit input values with n>m are fed to a control circuit and converted to a series of control values for the digital analog converter using dithering techniques. When the series of control values straddles a major transition where a large number of bits are switched between 1 and 0, a corrected series of control values is retrieved from a calibration table. The corrected series takes into account the glitch effects observed at the output of digital analog converter at a major transition.
Owner:SPECS ZURICH
Outdoor large screen display device
InactiveCN101241659AHigh night display image effectReduce system costAdvertisingDisplay meansScreedLarge screen display
The invention relates to an outdoor large screen display device which includes an automatic static picture switching display system used in high environment illumination intensity condition and a dynamic image display system used in low environment illumination intensity condition. Said automatic static picture switching display system comprises a winding type painting picture switching device, said dynamic image display system comprises a dynamic image display screen. In accordance with characteristics of day display and night display, the outdoor large screed display device uses low-cost painting picture in day high environment illumination intensity condition, and takes full use of low environment illumination intensity condition in night, two display states can be automatic identified switched, and forms perfect automatic advertisement display system.
Owner:曹嘉灿
Colorful pavement cementing material for low-grade road surface and preparation method of colorful pavement cementing material
The invention discloses a colorful pavement cementing material for a low-grade road surface, comprising the following components in percentage by mass: 30-45% of petroleum resin, 40-55% of high-aromatic mineral oil and 6-15% of modifier, wherein the high-aromatic mineral oil comprises catalytic slurry oil which is 10-20% of the total mass. The colorful pavement cementing material for the low-grade road surface, provided by the invention, has low needle penetration and high softening point, and is suitable for the low-grade road surface and has good road performances; an AC-16C asphalt mixture type is adopted in the cement material, and a road pavement material manufactured by taking the material as the cementing material has indexes including high temperature stability, water stability and low temperature stability which meet relevant national requirements and specifications, so that the colorful pavement cementing material is suitable for constructing a heavy-load traffic road surface.
Owner:CHINA PETROLEUM & CHEM CORP
Full-reference image-based objective quality evaluation method
ActiveCN104394405AImprove consistencyEffective predictionTelevision systemsImage extractionObjective quality
The invention relates to a full-reference image-based objective quality evaluation method. The method comprises the following steps: (1) acquiring image signals sr of reference images r in an image library and image signals sd of distorted images of different distortion types corresponding to the image signals s; (2) calculating an Euclidean distance DLLM between each reference image and distorted image extraction vector according to the acquired sr and sd; (3) calculating according to the Euclidean distance DLLM to obtain a primary objective evaluation score MLLM; (4) calculating the primary objective evaluation scores MLLM of a plurality of distorted images of different distortion types in the image library and objective evaluation scores thereof, and drawing a scoring scatter diagram; (5) establishing a reference line in the scoring scatter diagram, and calculating an adjustment value offset (xk) of the image of each distortion type; (6) adjusting to obtain the final objective evaluation score new (x1k) of the to-be-evaluated image. Compared with the prior art, the method has the advantages of high consistency in human eye subjective evaluation score, effectiveness to various distortion types, good fitting curve continuity and the like.
Owner:TONGJI UNIV
Blocking noise variance estimation based image accumulation signal to noise ratio calculation method
InactiveCN103810702AImprove monotonicityImprove applicabilityImage analysisSignal-to-noise ratio (imaging)Weight factor
The invention discloses a blocking noise variance estimation based image accumulation signal to noise ratio calculation method. By means of a watershed segmentation method in image segmentation processing, images are divided into blocks with uniform intensities, original image signal results are estimated through a blocking affine reconstruction method, meanwhile, border fuzzy processing is performed on affine reconstruction results to obtain optimal border fuzzy graphs, and signal to noise ratios of each section are accumulated with different weight factors in combination with noise splattering distribution to obtain an image accumulation signal to noise ratio index. The blocking noise variance estimation based image accumulation signal to noise ratio calculation method can be applied to fields such as image restoration, denoising and evaluation, and by means of the accumulation signal to noise ratio evaluation index, image qualities can be accurately evaluated.
Owner:ZHEJIANG UNIV
8-bit high-precision DAC current source array and layout method thereof
ActiveCN105897274AReduce dependencyReduce mismatchDigital-analogue convertorsSignal-to-noise ratio (imaging)Differential nonlinearity
The invention provides an 8-bit high-precision DAC current source array and a layout method thereof. Dependence between adjacent elements in a DAC current source array is reduced, and accumulation of second-order gradient errors is prevented; gradient errors are allocated to each element uniformly, and thus linearity of a circuit can be improved very well; and the co-gravity-center layout can offset influence of first-order gradient errors. High conversion accuracy and high speed are guaranteed, and meanwhile, mismatching of the current source array due to systematic errors and random errors can be reduced, so that the DAC circuit is allowed to have good monotonicity, offset error, differential nonlinearity error (DNL), integral nonlinearity error (INL), spurious-free dynamic range (SFDR) and signal-to-noise ratio (SNR).
Owner:南京德睿智芯电子科技有限公司
Bearing health state monitoring method based on convolution auto-encoder
ActiveCN113158814AImprove integrityImprove accuracyMachine bearings testingCharacter and pattern recognitionAlgorithmBearing vibration
The invention provides a bearing health state monitoring method based on a convolutional auto-encoder, and belongs to the field of bearing fault prediction and health management. The method comprises the following steps: firstly, acquiring a full-life-cycle digital vibration signal and a health state marking value of a brand new bearing; extracting intrinsic mode component statistic characteristics of the digital vibration signals and depth characteristics learned by using a convolutional auto-encoder, splicing and screening the two characteristics, inputting the screened characteristics into a full-connection regression network for regression training, and finally obtaining a health state curve graph of the bearing in the full life cycle; then, obtaining a current health state curve graph of the same type of to-be-monitored bearing; and comparing the two curve graphs to obtain a health state monitoring result of the to-be-monitored bearing. According to the method, the integrity of the bearing vibration signal features is improved through the convolution self-encoder, redundant features are removed by using a feature sorting and feature selection method, and the relatively accurate bearing health state can be obtained.
Owner:TSINGHUA UNIV
Harmful particle detection method before clinical use of injection
InactiveCN102798662AImprove monotonicityEasy to detectAnalysing fluids using sonic/ultrasonic/infrasonic wavesParticle size analysisNon destructiveObservational error
The invention discloses a harmful particle detection method before clinical use of an injection. The harmful particle detection method comprises an early-stage preparation step, a water feeding and draining step, a preparation detecting step and a detection step. The detection step comprises the following specific steps: controlling an ultrasonic transducer and a detection ultrasonic transducer to respectively transmit pulse ultrasonic waves according to the reference frequency f0, the frequency of 1.5f0 and the frequency of 0.75f0 by using a microprocessor, respectively recording the three scattering echo measuring values and overlapping the three scattering echo measuring values to obtain comparison scattering sound pressure V0 and scattering sound pressure V1 to be detected; obtaining a harmful particle detection result of information of particle sizes in relevant detection regions are longer or shorter relative to standard particles with 50 Mum particle size each and the like according to a ratio, namely k*V1 / V0 by the microprocessor; and meanwhile, displaying the result through a touch screen and carrying out sound-light alarming. According to the technical scheme, due to the adoption of a triple media ultrasonic back scattering and centrifugal sedimentation technology, harmful particle detection with non contact, non intrusion, non destructiveness and measurement error correcting function can be realized, and is simple in operation and feasibility.
Owner:SHAOXING UNIVERSITY
Digital-to-analog converter and method thereof
ActiveUS20080036635A1Improve monotonicityElectric signal transmission systemsDigital-analogue convertorsData controlFinite-state machine
Owner:REALTEK SEMICON CORP
Fine step and large gain range programmable gain amplifier
ActiveUS20050140451A1Quality controlImprove signal-to-noise ratioGain controlAmplifier with semiconductor-devices/discharge-tubesProgrammable-gain amplifierEngineering
A programmable gain amplifier with three stages uses fine steps, has a large gain range, and is monotonic. The first stage comprises several amplifiers, each including a resistive feedback loop. The feedback loop comprises a series of resistors, with each resistor acting as a tap. Since the number of resistors in the loop is unchanging, monotonicity and stability is guaranteed when resistance is increased using successive taps. A switch system connects two taps at a time to an interpolation stage. Each of these taps corresponds to a specific resistor level, and thus a gain level. The interpolation stage uses a plurality of current sources inside a feedback amplifier to control the interpolation, in order to provide fine gain steps.
Owner:AVAGO TECH INT SALES PTE LTD
Method and device for adjusting face of virtual character in game, electronic equipment and medium
PendingCN109865283AAchieve regulationEasy to adjustVideo gamesComputer terminalHuman–robot interaction
The invention provides a method and device for adjusting the face of a virtual character in a game, electronic equipment and a computer readable storage medium, and belongs to the technical field of human-computer interaction. The method is applied to a mobile terminal and characterized in that the mobile terminal comprises a touch sensor, and the touch sensor is used for detecting a touch operation received by a bezel of the mobile terminal. The method comprises the steps of determining a to-be-adjusted target part of the face of the virtual character; adjusting the target part according to the operation force of a pressing operation in response to the pressing operation which is detected by the touch sensor and acts on the bezel. By means of the method and device for adjusting the face of the virtual character in the game, the electronic equipment and the computer readable storage medium, the interaction feedback feeling of the virtual character for the adjusting process can be improved, and diverse use experience is brought to a user.
Owner:NETEASE (HANGZHOU) NETWORK CO LTD
Method for preprocessing vibration signal of mechanical component with missing value
ActiveCN112784744AIntegrity guaranteedGuarantee authenticitySustainable transportationCharacter and pattern recognitionFeature extractionAlgorithm
The invention provides a method for preprocessing a vibration signal of a mechanical component with a missing value. The method comprises the following steps: the step 1, calculating a root-mean-square of an original vibration signal by using a feature extraction method; the step 2, establishing an exponential stochastic regression model, and estimating model parameters; the step 3, interpolating a root mean square missing value of the vibration signal based on Monte Carlo simulation; the step 4, interpolating the missing value of the original vibration signal; and the step 5, carrying out quality analysis on the vibration data of the mechanical component. According to the method, the integrity and authenticity of original data are guaranteed, the process fo the method has low calculation requirements on model parameters, iterative calculation is not needed, parameter estimation has an analytical expression, the calculation efficiency is high, the method is scientific, the manufacturability is good, and the method has wide popularization and application value.
Owner:BEIHANG UNIV +1
Definition evaluation value calculation method and device, camera and storage medium
PendingCN112950523AGood unbiasednessImprove accuracy and stabilityImage enhancementTelevision system detailsPhysicsIr image
The embodiment of the invention discloses a definition evaluation value calculation method and device, a camera and a storage medium. The method comprises the following steps: collecting a current focusing scene; when a focusing motor of the camera moves to a focusing position according to a preset step length, selecting RGB image data or IR image data or RGB + IR image data collected by an RGB-IR image sensor according to a current focusing scene, and calculating a definition evaluation value of the current focusing scene according to the selected image data. According to the embodiment of the invention, the definition evaluation value is calculated by selecting different image data for different focusing scenes, so that good unbiasedness, unimodality and monotonicity of the definition evaluation value are ensured, and the stability and accuracy of the focusing effect under low illumination are further improved.
Owner:ZHEJIANG UNIVIEW TECH
Audio and video recognition system and method based on the Internet
ActiveCN106535006ASpeed up queryAdd statisticsSelective content distributionVideo storageVideo retrieval
The invention discloses an audio and video recognition system based on the Internet. The system comprises a data acquisition module, a data playing module, a video monitoring module, a video storage module, a video retrieval module and a video statistical module; the data acquisition module is connected with the data playing module, and the data acquisition module comprises an audio and video extraction unit, a protocol analysis unit, a media decoding unit and a user management unit; the data playing module is separately connected with the video monitoring module and the video storage module; and the video storage module is separately connected with the video retrieval module and the video statistical module. According to the audio and video recognition system disclosed by the invention, the acquired audio and video information is played by the video playing module, thereby having a diversified playing mode and perfecting the monotonicity of the video playing mode; and the audio and video are stored, retrieved and counted, so the video query and statistical functions can be increased; and the audio and video programs transmitted by the Internet can be checked through the video monitoring module to improve the management to the contents of the audio and video.
Owner:朝阳聚声泰(信丰)科技有限公司
Speech recognition method and device, equipment and storage medium
PendingCN114155834ARealize regularizationImprove accuracySpeech recognitionSpeech soundSubvocal recognition
The invention provides a voice recognition method and device, equipment and a storage medium. The method comprises the following steps: acquiring a coding feature obtained by coding an acoustic feature of a to-be-recognized voice by a coder; wherein the encoder is obtained according to a first recognition result of a voice sample and text label training of the voice sample, and the first recognition result of the voice sample is obtained according to encoding features obtained by encoding acoustic features of the voice sample by the encoder; determining the attention coefficient of the recognition result of the voice sample on the coding feature of each frame output by the encoder; and determining a voice recognition result of the to-be-recognized voice according to the coding features of the to-be-recognized voice. According to the technical scheme, the speech recognition accuracy can be improved.
Owner:UNIV OF SCI & TECH OF CHINA +1
A Performance Degradation Evaluation Method of Turbine Engine Based on Stacked Denoising Autoencoder
ActiveCN109000930BReduce participationEasy to handleGas-turbine engine testingJet-propulsion engine testingMultiple sensorEngineering
The invention discloses a turbine engine performance degradation evaluation method based on a stacked-denoising auto-encoder, and belongs to the technical field of engine performance degradation evaluation. The turbine engine performance degradation evaluation method solves the problems that traditional multi-sensor data selection needs to rely on complex information evaluation criteria, extraction of degraded features in HI construction depends on a large number of signal processing techniques and expert experience, supervised training method label selection relies on manual participation, and a method is low in universality. Four denoising auto-encoders build stacked-denoising auto-encoders to extract the single node value of input data. Training set data carries out pre-training to thenetwork and uses a BP algorithm to fine-tune parameters. The extracted single node value is considered to be the health factor value at each cycle, and an HI curve of a training set is established. The test set is input to the trained stacked-denoising auto-encoder to obtain the health factor value at each cycle and construction an HI curve. The HI curves of training set and test set are subjectedto smoothing processing respectively, and the HI curves after smoothing processing are evaluated.
Owner:HARBIN INST OF TECH
Digital-to-analog converter
InactiveCN113131942AReduce areaImprove monotonicityDigital-analogue convertorsPhysical parameters compensation/preventionResistor ladderTelecommunications
The invention discloses a digital-to-analog converter. The converter comprises: a first resistance network comprising an R-2R resistance ladder structure coupled between a reference voltage and a first node; a second resistance network including a resistor string structure coupled between the first node and the output port; a switching control circuit including a first switch located in a ground path of the second resistive network, and a second switch located between the first node and the output port; and a logic control circuit which is used for controlling the on / off state of the first switch and the second switch according to a digital input signal, so that an R-2R resistance ladder structure which saves more area is adopted under the condition that the resistance ladder is not sensitive to output monotonicity, and under the condition of being sensitive to output monotonicity, a resistor string structure is adopted to carry out linear voltage division so as to improve the output monotonicity.
Owner:SG MICRO
Design and method of domain layout of 14-bit integrated circuit DAC (Digital to Analog Converter) current source array
ActiveCN102638270BImprove monotonicityGood offset errorDigital-analogue convertorsSignal-to-noise ratio (imaging)Engineering
Owner:CHENGDU CORPRO TECH CO LTD
Oily hair wax containing Chinese herbal medicines and preparation method of oily hair wax
InactiveCN104887567ANo damageImprove protectionCosmetic preparationsHair cosmeticsSalvia miltiorrhizaAmnesia
The invention discloses an oily hair wax containing Chinese herbal medicines and a preparation method of the oily hair wax, and belongs to the technical field of cosmetics. The oily hair wax comprises the following components in parts by weight: 30-40 parts of lignite wax, 8-10 parts of a hexadecanol and octadecanol mixture, 8-15 parts of stearin, 10-15 parts of a propolis oil solution, 3-7 parts of an opacifying agent Op301, 10-15 parts of glycerin, 10-13 parts of an angelica sinensis extract, 8-10 parts of a ginseng extract, 10-15 parts of a radix rehmanniae recen extract, 15-20 parts of a polygonum multiflorum extract, 5-8 parts of a salviae miltiorrhizae extract, 3-5 parts of a sesame extract, 10-15 parts of a walnut extract, 15-20 parts of a mint extract, 3-5 parts of an essence and 10-15 parts of deionized water. The oily hair wax disclosed by the invention is capable of nourishing hair roots, has a significant improvement effect on the symptoms such as insomnia and dreaminess, pain in the waist and back, deficiency body and amnesia after being used for a long period of time, and meets the urgent requirements of the public on the hair wax with nutrition and herbal nourishment effects at present.
Owner:KUNMING UNIV OF SCI & TECH
Conversion circuit based on resistance voltage division and capacitance integration and digital-to-analog converter
PendingCN113162623AReduce clock frequencyReduce power consumptionAnalogue/digital conversionElectric signal transmission systemsCapacitanceClock rate
The invention provides a conversion circuit based on resistance voltage division and capacitance integration and a digital-to-analog converter, and relates to the technical field of integrated circuits. The circuit comprises a resistance voltage division unit and a capacitance integration unit, the resistance voltage dividing unit receives a reference voltage and outputs a first analog voltage or a second analog voltage to the capacitance integration unit. The capacitance integration unit comprises a first sampling transfer module and a second sampling transfer module; the first sampling transfer module and the second sampling transfer module perform sampling alternately, control time sequences are complementary, and when the first sampling transfer module performs charge transfer, the second sampling transfer module performs pre-sampling. According to the conversion circuit, on the basis that high-precision conversion and good monotonicity of the digital-to-analog converter are guaranteed, the clock frequency needed by the whole digital-to-analog conversion is reduced in a phase-changing mode, equivalently, the power consumption needed by the digital-to-analog conversion is reduced, and the conversion circuit has high practical value.
Owner:PEKING UNIV
A wireless positioning method and system
ActiveCN110049502BReduce manufacturing costReduce performanceNetwork planningData exchangeSignal strength
The present invention provides a wireless positioning method and system, wherein the method includes: 1) when a terminal exchanges data with a wireless base station, the terminal or the wireless base station collects the actual data receiving rate of the data exchange; 2) ) executing a positioning algorithm according to the received data reception rate. Based on the solution of the present invention, there is no need to specially set up hardware devices such as GPS, and it is not necessary to deploy a large number of dedicated hardware for wireless positioning in the environment. The present invention realizes the positioning based on the data receiving rate, does not need to communicate separately for the positioning, and the data receiving rate can match with any existing wireless positioning algorithm, and can obtain a better effect than using signal strength in certain environmental conditions .
Owner:INST OF COMPUTING TECH CHINESE ACAD OF SCI
A 10-bit high-precision DAC current source array and its layout method
ActiveCN106130550BGood compatibilityExact copyDigital-analogue convertorsPhysical parameters compensation/preventionCapacitanceMirror image
The invention provides a 10-bit high-precision digital-to-analog converter (DAC) current source array and a layout method thereof. Firstly a mirror image to be rotated is generated for replacing a 16*16 sub-array Z to be converted, and the 16*16 sub-arrays are respectively obtained by multiple times of conversion and then are further composed into a final array. According to the layout method of the invention, matching of high and low current sources in the DAC current source array can be improved, integral non-linearity (INL) and differential non-linearity (DNL) characteristics of the DAC can be reduced, and a chip area is further reduced, and the space is saved; a current mirror can copy the current more accurately; and furthermore, a stray capacitance value can also be reduced, and surges generated during conversion between an MSB and an LSB can be effectively reduced. The layout of the same center of gravity adopted by the invention can be effectively improved, the influence of a ladder degree error can be counteracted, and mismatching of the current source array caused by systematic errors and random errors can be reduced while high conversion precision and high speed are ensured, so that the DAC circuit has better performance.
Owner:南京德睿智芯电子科技有限公司
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