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56results about How to "Suppress low frequency noise" patented technology
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CMOS APS readout scheme that combines reset drain current and the source follower output
InactiveUS7317484B2Reduce low frequency noiseReduce noiseTelevision system detailsTelevision system scanning detailsMultiplexingEngineering
A circuit and method for reducing noise in video imagers which takes advantage of the fact that the same image information is present in the drain current in a reset transistor used to reset a photodiode in a pixel as is present in the readout current. The noise is reduced by passing the multiplexed output voltage from the source follower output transistor in an APS imager system through a high pass filter to reduce the low frequency noise from the source follower. The drain current in the reset transistor used to reset the APS is passed through a low pass filter. The low pass filter output and the high pass filter output are then combined. Since the drain current in the reset transistor contains the same image information as the voltage output of the source follower output transistor the image information can be obtained by combining the output of the low pass filter and the output of the high pass filter. Since the low frequency noise components of the source follower output transistor have been suppressed combined outputs of the low pass filter and high pass filter will provide the image information with greatly suppressed low frequency noise.
Owner:RPX CORP
A Staggered Grid 3D Seismic Prestack Reverse Time Migration Imaging Method Based on Small GPU Storage
ActiveCN102269820ASuppress low frequency noiseDispersion suppressionSeismic signal processingWave equationReflected waves
A staggered grid 3D seismic prestack reverse time migration imaging method based on GPU small storage capacity is a very important technology for 3D prestack depth migration imaging of complex structures. The reverse time migration method based on the two-way wave equation has been realized, which can accurately image the rotary wave and the large-angle reflected wave, and at the same time solve the problem of the large amount of calculation of this method. Utilizing parallel computing technology based on GPU hardware, staggered grid difference format, checkpoint storage and other technologies, and relying on Laplace imaging conditions, the pre-stack reverse time migration imaging of 3D seismic data is realized, which greatly shortens the computing time. The efficiency has been increased hundreds of times, and the imaging accuracy has been significantly improved.
Owner:SINO GEOPHYSICAL CO LTD
Self-biased phase-locked loop
ActiveCN101588178AEasy to implementReduce jitterPulse automatic controlLogic circuits coupling/interface using field-effect transistorsLoop filterPhase frequency detector
Owner:SEMICON MFG INT (SHANGHAI) CORP
Acoustic interaction active noise reduction device arranged at vent pipe port and control method
ActiveCN108088064AReduce volumeEasy to useNoise suppressionEfficient regulation technologiesEngineeringNoise reduction
The invention relates to an acoustic interaction active noise reduction device arranged at a vent pipe port. The acoustic interaction active noise reduction device comprises a shell, a loudspeaker, areference microphone, a plurality of error microphones, a controller and a flow diffuser. The loudspeaker is arranged in the shell. The reference microphone is arranged on the top of the shell. The acoustic input end of the reference microphone faces the outer portion of the shell. The error microphones are arranged on the bottom surface of the shell and are arranged in the positions close to theedge of the bottom surface. The controller is arranged in the shell. The loudspeaker, the reference microphone and the error microphones are all in lead wire connection with the controller. A third through hole is formed in the center of the flow diffuser. The bottom surface of the shell is arranged in the third through hole. The invention further provides an acoustic interaction active noise reduction control method. The acoustic interaction active noise reduction device is simple in structure and small in size, and acoustic interaction can be achieved through the active noise reduction device during active noise reduction.
Owner:QINGDAO TECHNOLOGICAL UNIVERSITY
Functional electrical stimulation fuzzy control method
InactiveCN102319482AAchieve walkingTo achieve the purpose of automatic controlArtificial respirationFunctional electrical stimulationIndependent component analysis
The invention discloses a functional electrical stimulation fuzzy control method, which relates to the technical field of disabled person rehabilitation medical appliances and comprises the following steps that: the surface electromyographic signals are collected by multiple channels; a high-pass filter is adopted for carrying out filtering processing to filter the low-frequency noise caused by the electrode sliding; the filtering processing is carried out through fast independent component analysis for filtering industrial industry interference; the time domain analysis is carried out on the surface electromyographic signals after the secondary filtration to obtain the root-mean-square; errors and error variation rates between the output root-mean-square matrix value and the expected root-mean-square matrix value are used as the input of a fuzzy controller, and the stimulation current intensity precision quantity is used as the output; the errors and the error variation rates are converted to the discourse domain value according to the proper proportion, and the membership function is determined; the control rule and the membership function are used for deducting the errors and the error variation rate to obtain the stimulation current fuzzy quantity; and the defuzzification processing is carried out to obtain the stimulation current intensity precision quantity. The accuracy and the stability of a functional electrical stimulation (FES) system are effectively improved.
Owner:TIANJIN UNIV
Upstream and downstream wave field decomposition-based inverse-time migration method and system
InactiveCN109307890ASuppress low frequency noiseImproving the Accuracy of Imaging SectionsSeismic signal processingImaging conditionMutual correlation
The invention proposes an upstream and downstream wave field decomposition-based inverse-time migration method and system. The method comprises the steps of building an analysis wave field of an earthquake source and earthquake record; performing wave field positive and negative prolongation on the analysis wave field; performing Hilbert transform on the wave field in an imaging gridding at each propagation moment along a depth direction to obtain a transformed conversion wave field; solving an upstream wave field and a downstream wave field according to an original wave field and the conversion wave field; and selecting the wave field in a special direction to image according to a mutual correlation imaging condition. By the upstream and downstream wave field decomposition-based inverse-time migration method, the low-frequency noise in inverse-time migration can be effectively prevented, and the imaging profile accuracy is improved; and meanwhile, the method has relatively good wavelet amplitude-maintaining performance, and technological guarantee is also provided for subsequent fidelity processing.
Owner:CHINA PETROLEUM & CHEM CORP +1
GIS (gas insulated switchgear) single-time partial discharge signal extraction and trigger moment adjusting method
ActiveCN103308829AReduce gapSuppress low frequency noiseTesting dielectric strengthWavelet denoisingSwitchgear
The invention specifically discloses a GIS (gas insulated switchgear) single-time partial discharge signal extraction and trigger moment adjusting method. The method comprises the steps that (1) a single partial discharge fault of a GIS is obtained by utilizing an ultrahigh frequency electromagnetic wave sensor; (2) the high frequency noise in the fault signal in the step (1) is filtered out by utilizing the wavelet denoising method; (3) the fault signal subjected to filtering in the step (2) is normalized and is processed to obtain the absolute value; (4) the numerical differentiation of the signal obtained in the step (3) is worked out; (5) taking the differentiation signal as the basis, the threshold method is utilized to locate the position of the leading edge of the discharge wave crest of each discharge signal in the fault signal; (6) the positions of the discharge signals in the original fault signal, obtained in the step (5) and the corresponding sampling values are taken as the basis; (7) the position of the initial point of each discharge wave crest in the original fault signal is determined; and (8) the single discharge signal is adjusted to have the specific discharge initial position by adopting the method of supplementing system white noise according to each discharge signal intercepted in the step (7).
Owner:STATE GRID CORP OF CHINA +1
Narrowband switching millimeter wave voltage-controlled oscillator with wide tuning range
ActiveCN110729967AImprove phase noiseReduce phase noiseOscillations generatorsHigh level techniquesCapacitancePhase noise
The invention discloses a narrowband switching millimeter wave voltage-controlled oscillator with a wide tuning range, and the narrowband switching millimeter wave voltage-controlled oscillator comprises a negative resistance unit which provides energy for maintaining oscillation for a resonant cavity, and a main oscillation circuit which employs an improved pi-type differential circuit structureand is used for achieving the oscillation and improving the quality factor of a resonant circuit; the filter capacitor and the tail current source MOS tube form a low-pass filter, so that the phase noise of the oscillator is reduced; the narrowband switching circuit comprises four basic LC VCOs. The output buffer circuit connects the four narrow-band VCOs in a common-drain manner, outputs the selected narrow-band VCO, and provides driving for subsequent circuits. According to the invention, based on the 65nm CMOS process design, good noise performance is realized.
Owner:TIANJIN UNIV
Ultrashort pulse carrier-envelope phase detection device and method
An ultrashort pulse carrier-envelope phase detection device comprises an ultrashort pulse laser of a fixed repetition frequency, a michelson interferometer, an optical beam splitter, a first optical filter, a first photoelectric detector, a first electrical frequency doubling unit, a second optical filter, a second photoelectric detector, a second electrical frequency doubling unit, and an electrical frequency mixing and filtering unit. The ultrashort pulse laser, the michelson interferometer and the optical beam splitter are in light path connection in order. The first optical filter, the first photoelectric detector, and the first electrical frequency doubling unit with a multiple of (p-1) are connected with a first output end of the optical beam splitter. The second optical filter, the second photoelectric detector, and the second electrical frequency doubling unit with a multiple of p are connected with a second output end of the optical beam splitter. The electrical frequency mixing and filtering unit is connected with output ends of the first electrical frequency doubling unit and the second electrical frequency doubling unit. The modes of time domain time delay and frequency domain selection are adopted, front and back pulses delayed for a certain period are subjected to coherent detection with the michelson interferometer, two different frequency windows are used for frequency domain selection, signals representing carrier-envelope phase jitter are extracted, and measurement of the ultrashort pulse carrier-envelope phase signals are achieved by electrical frequency doubling and frequency mixing processes.
Owner:UNIV OF SHANGHAI FOR SCI & TECH
Active filter and communication system
ActiveCN104506026AReduce volumeSuppress low frequency noisePower conversion systemsActive power filterControl circuit
The invention provides an active filter and a communication system. The active filter comprises a main circuit and a control circuit, wherein the control circuit is used for detecting first current output by a negative electrode at the input end of a conversion circuit so as to obtain a harmonic component in the first current and generating a control signal according to the harmonic component; the main circuit is used for generating second current opposite to the phase of the harmonic component under the control of the control signal so as to enable source current formed by the first current and the second current through a power supply. According to the active filter provided by the invention, effective suppression on low-frequency noise can be realized.
Owner:HUAWEI TECH CO LTD
Multi-scale image noise reduction method and device
InactiveCN109993703ASuppress high frequency noiseSuppress low frequency noiseImage enhancementImage analysisImage denoisingWavelet decomposition
The invention provides a multi-scale image noise reduction method and device. The method comprises the following steps: carrying out three-layer wavelet decomposition on an input N*N image block; performing soft threshold shrinkage on each layer of wavelet high-frequency sub-band; performing bilateral filtering on the low-frequency sub-band after wavelet decomposition; and performing wavelet inverse transformation reconstruction according to the high-frequency sub-band subjected to soft threshold shrinkage and the low-frequency sub-band subjected to bilateral filtering to obtain a reconstructed N*N image block. According to the method, through multi-scale image noise reduction combining wavelet decomposition and bilateral filtering, high-frequency noise and low-frequency noise of differentscales in the Y-channel image can be suppressed at the same time.
Owner:SPREADTRUM COMM (SHANGHAI) CO LTD
Sound insulation band gap material with two-dimensional serial structure
InactiveCN101794573AImprove sound insulationSuppress low frequency noiseSound producing devicesEnvironmental noiseSound barrier
The invention relates to a sound insulation band gap material with a two-dimensional serial structure, belonging to the field of acoustics and relating to the fields of condensed matter physics, mechanics, machinery, materials science, and the like. The structure is formed by respectively arraying and serially connecting parallel pipes (solid pipes, hollow metallic pipes or non-metallic pipes) in air according to tetragonal lattices, triangular lattices and honeycomb lattices. The sound insulation band gap material with a two-dimensional serial structure is characterized in that the tetragonal lattices in a gamma-X direction at least include three layers, and the triangular lattices and the honeycomb lattices in a gamma-M direction at least include four layers; the arraying sequences of the three lattices have no relations, and the gamma-X direction of the tetragonal lattices and the gamma-M direction of the triangular lattices and the honeycomb lattices are parallel to the same straight line; and sound waves are transmitted along the gamma-X direction and the gamma-M direction in the serial structure. The sound insulation band gap material with a two-dimensional serial structure can better suppress environmental noise within a frequency range of 1-3kHz which is the most sensitive to the human ears, thereby being used for sound barrier and having wide engineering application potential in reducing the noise of highways, railways, urban traffics and rooms.
Owner:BEIJING UNIV OF TECH
Double-working mode acoustic liner for broadband noise suppression and control method
ActiveCN105872894AWide frequency rangeReduce complexityTransducer circuitsNoise controlBroadband noise
The invention belongs to the technical field of noise control, and provides a double-working mode acoustic liner for broadband noise suppression and a control method in order to overcome the problems that the existing acoustic liner cannot realize effective noise suppression in a relatively wide band range; when the acoustic absorptivity of the acoustic liner is not restricted by acoustic source frequency, the system is relatively large in volume and relatively slow in dynamic response; and the application of the acoustic liner will be restricted in an aircraft especially in an unmanned aerial vehicle. Piezoelectric materials form an array, thus forming a disturbed impedance adjustable acoustic liner system. A direct current within 30 V is imported between upper electrodes and lower electrodes, thus enabling the acoustic liner to work in a static mode. An alternate current of 30V is imported, thus enabling the acoustic liner to work in a dynamic mode. In two modes of the static mode and the dynamic mode, the relatively high acoustic absorptivity is kept in the broadband. A device realizes synchronous adjustment of acoustic impedance and two working modes. The system complexity is reduced to the greatest extent; system integration and miniaturization is convenient; and the band range of the acoustic liner is extended.
Owner:ZHONGBEI UNIV
Nuclear magnetic resonance gyroscope photomagnetic modulation detection system and nuclear magnetic resonance gyroscope photomagnetic modulation detection method
ActiveCN108020221AImprove carrier capacityIntegrity guaranteedTurn-sensitive devicesGyroscopePolarizer
The invention belongs to a nuclear magnetic resonance gyroscope detection method, and specifically discloses a nuclear magnetic resonance gyroscope photomagnetic modulation detection system and a nuclear magnetic resonance gyroscope photomagnetic modulation detection method. The nuclear magnetic resonance gyroscope photomagnetic modulation detection system comprises a polarizer, a magnetic resonance gas chamber, a Faraday coil, an analyzer and a photoelectric detector, wherein the centers of the polarizer, the magnetic resonance gas chamber, the Faraday coil, the analyzer and the photoelectricdetector are sequentially positioned on the optical path of detection laser, the axis direction of the Faraday coil coincides with the optical path direction of the detection laser, the output end ofthe photoelectric detector is connected to a signal processing system, and the signal processing system drives the Faraday coil. According to the present invention, the signal output frequency of a signal generator is regulated to be equal to the design frequency of the Faraday coil, the magnetic resonance gas chamber is heated, the modulated laser signal is confirmed when the frequency of the output signal is the same as the frequency of the received drive signal of the Faraday coil, a lock-in amplifier is regulated so as to lock at the frequency of more than the Faraday coil modulation frequency, and then wave filtering treatment is performed; and with the method, the carrier ability of the detection laser and the integrity of the signal after the post-demodulation can be improved, andthe low-frequency noise of the gyroscope detection signal can be inhibited.
Owner:BEIJING AUTOMATION CONTROL EQUIP INST
Kalman and wavelet fused MEMS gyroscope self-adaptive anti-outlier denoising method
ActiveCN110991015AAvoid the effects of filteringImprove filtering accuracyInternal combustion piston enginesDesign optimisation/simulationGyroscopeSelf adaptive
Owner:CHINA THREE GORGES UNIV
Friction material composition, friction material, and friction member
ActiveUS20190024744A1Excellent friction coefficient stability and crack resistance and abrasion resistanceSuppress low frequency noiseOther chemical processesBraking discsPhlogopiteFiber
Provided is a friction material composition including: a binder; an organic filler; an inorganic filler; and a fiber substrate, in which a content of copper as an element is 0.5% by mass or less, the friction material composition contains at least one of phlogopite or biotite in a total of from 3% by mass to 9% by mass, and a graphite in an amount of from 2% by mass to 6% by mass, as the inorganic fillers, the at least one of phlogopite or biotite has an average particle size of from 340 μm to 1,500 μm, and the graphite has an average particle size of from 450 μm to 1,100 μm.
Owner:RESONAC CORP
Method for lowering low-frequency noise of rear torsion beam automobile model braking
InactiveCN109238734AIncrease manufacturing costSuppress low frequency noiseVehicle testingSound producing devicesDiagnostic Radiology ModalityNoise generation
The invention discloses a method for lowering the low-frequency noise of rear torsion beam automobile model braking, and belongs to the technical field of automobile braking. The method comprises thefollowing steps that: carrying out a noise detection experiment on a finished automobile when a rear-disk type brake works under different working conditions, and determining a working condition whichgenerates low-frequency noise; according to the working condition, simulating and reproducing low-frequency noise, meanwhile, carrying out a vibration frequency test, and determining a low-frequencynoise transferring path; carrying out modality analysis on parts, comparing with an experiment result, and identifying parts subjected to modality coupling with the low-frequency noise; and changing the modality of the modality coupling parts, and cutting off the noise transferring path. The method has the beneficial effects that a low-frequency noise generation mechanism is combined to determinethe noise transferring path, and the modality of the parts subjected to modality coupling with the low-frequency noise is changed to cut off the noise transferring path to inhibit the low-frequency noise. The method is simple and effective, is low in cost, is high in universality and has good economic benefit, and low-frequency noise under different working conditions can be further lowered and eliminated.
Owner:CHERY COMML VEHICLE ANHUI
Method for inhibiting noise of downwind type wind generator set based on variable-helical-angle groove
ActiveCN109083814ASimple structureEasy to implementEngine fuctionsWind motor supports/mountsEngineeringWind power generator
A method for inhibiting the noise of a downwind type wind generator set based on a variable-helical-angle groove relates to a cylindrical tower truss wind generator set. The position and length of thegroove are determined on a cylindrical tower truss; on the cylindrical tower truss, the helical angle degree of the groove is determined; and the depth and width of the groove and the geometric shapeof the groove are designed. The method not only can inhibit the development of the Karman vortex street of cylindrical wake flow, but also can perform a drag reducing function. The low frequency noise of a paddle tip part is better inhibited by the variable-helical-angle groove on account of the large noise characteristic of the paddle tip part. The method for inhibiting the noise of the downwindtype wind generator set based on the variable helical angle groove has the advantages that the structure is simple, realization is convenient, an extra complicated control system is not needed, the noise reducing effect is remarkable, and the scheme for inhibiting the noise of the downwind type wind generator set is potential.
Owner:XIAMEN UNIV
Dishwasher and home appliance
ActiveCN102949163AImprove bindingSuppress low frequency noiseTableware washing/rinsing machine detailsOther washing machinesHome applianceElectric power
A dishwasher (10) including a housing (11) forming an exterior, a tableware cleaning tub (12) formed at an inside of the housing (11), and a power cord (30) configured to supply a power, the housing (11) including a housing body (40), a power cord (30) insertion hole (43) which is provided at one side of the housing body (40) for a portion of the power cord (30) to be inserted into an inside of the housing (11), and an open / close unit (41) rotatably coupled to the housing body (40) to open / close the power cord insertion hole (43), the open / close unit (41) equipped with a first accommodation groove (44) to accommodate the portion of the power cord (30) inserted into the inside of the housing (11), the power cord (30) including a fixing unit configured to fix the power cord (30) to the housing body (40) when the open / close unit (41) closes the power cord insertion hole (43), the fixing unit comprising a coupling member (32) which is coupled to the first accommodation groove (44) of the open / close unit (41), and a fixing member (31) which is fixed to the housing body (40).
Owner:SAMSUNG ELECTRONICS CO LTD
Friction material composition, friction material, and friction member
ActiveUS10570975B2Excellent friction coefficient stability and crack resistance and abrasion resistanceSuppress low frequency noiseOther chemical processesBraking discsFiberPhlogopite
Provided is a friction material composition including: a binder; an organic filler; an inorganic filler; and a fiber substrate, in which a content of copper as an element is 0.5% by mass or less, the friction material composition contains at least one of phlogopite or biotite in a total of from 3% by mass to 9% by mass, and a graphite in an amount of from 2% by mass to 6% by mass, as the inorganic fillers, the at least one of phlogopite or biotite has an average particle size of from 340 μm to 1,500 μm, and the graphite has an average particle size of from 450 μm to 1,100 μm.
Owner:RESONAC CORP
Silencer of air inlet for reciprocating type compressor
InactiveCN1461884ASuppress low frequency noiseSuppress high frequency noisePositive displacement pump componentsSilencing apparatusEngineeringMuffler
A silencer of air inlet for reciprocating compressor is composed of a main body, a cold medium sucking tube, several deformable parts, tubular resonator, and cold medium discharging tube. Said deformable parts are several plates, which are parallelly arranged at intevals in the cavity of main bdoy. When temp is raising up, the voume of deformable parts is increased until the gap between adjacent deformable parts is eliminated. The cavity of main body is divided into two parts. Its advantages are simple structure, low cost and high noise suppressing effect.
Owner:LG ELECTRONICS (TIANJIN) APPLIANCES CO LTD
Received signal strength detection circuit and method
ActiveCN111726179ASuppress low frequency noiseReduced Sampling Ripple InterferenceTransmission monitoringTime domainTelecommunications
An embodiment of the invention provides a received signal strength detection circuit and method. The circuit comprises a ripple-suppressed OOK signal amplitude detection module and a time domain analog-to-digital conversion module, wherein the OOK signal amplitude detection module for ripple suppression receives an OOK receiving signal, converts the OOK receiving signal into a direct-current analog amplitude signal, and suppresses alternating-current ripples in the conversion process; the time domain analog-to-digital conversion module converts the DC analog amplitude signal into an amplitudefrequency modulation signal, measures the frequency of the amplitude frequency modulation signal, and outputs a digital amplitude signal representing a measurement result. According to the circuit disclosed in the embodiment of the invention, the OOK signal amplitude detection module for ripple suppression can be used to perform high-efficiency and high-precision sampling on the OOK signal amplitude; sampling ripple interference can be effectively reduced, conversion from sampling voltage to frequency signals is achieved through the time domain analog-digital conversion module, low-frequency noise can be greatly restrained, and therefore ultra-low-power-consumption received signal strength detection is achieved.
Owner:TSINGHUA UNIV
Gas turbine device
Provided is a gas turbine device that can effectively suppress low frequency noise and low frequency vibrations during low-load operation, without causing an increase in exhaust gas pressure loss. The gas turbine device is provided with the following: a gas turbine engine (GT) having an exhaust diffuser (20) that forms the upstream section of an exhaust gas flow path (30); exhaust struts (31) provided in the diffuser (20); and revolution suppression plates (32) that extend in the axial direction and are disposed on the downstream side of the exhaust struts (31) in the exhaust gas flow path (30).
Owner:KAWASAKI HEAVY IND LTD
Radar having structure able to suppress low-frequency noise
ActiveUS20180224525A1Suppress low frequency noisePreventing accuracy of target detectionAntenna arraysWaveguide type devicesRadarEngineering
A vehicle radar. In the vehicle radar, a high-pass filter is disposed on a signal line connecting a transmitting chip and a receiving chip, the signal line allowing a local oscillation signal to be transferred therethrough. The high-pass filter prevents noise from being introduced through the signal line, along which the local oscillation signal is transferred. This prevents the accuracy of detection from being lowered by low-frequency noise generated from the interior of the vehicle radar. The high-pass filter connected to the signal line is embodied as a variety of configurations, thereby providing a structure able to effectively suppress low-frequency noise while maintaining the existing structure of the vehicle radar.
Owner:HL KLEMOVE CORP
Method for calibrating and optimizing quantum gate in experiment
PendingCN114492817ASuppress random fluctuationsSuppress low frequency noiseQuantum computersQuantum circuitEngineering
The invention provides a method for calibrating and optimizing a quantum gate in an experiment. The method comprises the following steps: S1, obtaining a quantum circuit comprising a plurality of adjoint Clifford gates, and calculating the average fidelity of the adjoint Clifford gates; s2, according to the average fidelity of the accompanying Clifford gates, determining the number of the corresponding accompanying Clifford gates when the error amplification factor is maximum; s3, generating a calibration circuit based on the number of the accompanying Clifford gates, alternately using the initial CZ gate to test the calibration circuit to obtain a first fidelity, and using the optimized CZ gate to test the calibration circuit to obtain a second fidelity; and S4, creating an objective function according to the first fidelity and the second fidelity, and evaluating the increase amount of the average fidelity accompanying the Clifford gate, thereby optimizing the CZ gate.
Owner:UNIV OF SCI & TECH OF CHINA
Noise reduction device of blade of wind generating set
InactiveCN108533450AReduced sweep noise sound power levelReduce annoyanceWind motor controlFinal product manufactureEngineeringSound power
The invention discloses a noise reduction device of a blade of a wind generating set. The noise reduction device is of a sawtooth-shaped strip-shaped structure, the sawtooth-shaped strip-shaped structure is arranged at the trailing edge of 70%-100% of a wingspan of the blade of the wind generating set, the sawtooth-shaped strip-shaped structure comprises saw teeth and a mounting surface, the height of the sawteeth is 10%-20% of the local chord length of the blade, and the saw teeth are in a half-sine wave fluctuation. The noise reduction device for the blade of the wind generating set can reduce the noise sound power level of the blade, meanwhile, noise modulation is inhibited, the noise annoyance degree is reduced, the advantages of being simple in structure and low in cost are achieved,and the feasibility is high.
Owner:ZHEJIANG WINDEY
Successive approximation analog-to-digital converter and conversion method thereof
ActiveCN113078906AFast conversionReduce dynamic power consumptionAnalogue/digital conversionElectric signal transmission systemsConvertersHemt circuits
The invention provides a successive approximation analog-to-digital converter and a conversion method thereof, and the converter comprises a sampling circuit, a conversion circuit , and a digital control circuit ; thesampling circuit is used for obtaining an in-phase end output voltage and an anti-phase end output voltage based on a current input signal during the first sampling; when sampling is not carried out for the first time, an in-phase end output voltage and an anti-phase end output voltage are obtained based on a difference value between a current input signal and a previous input signal; the conversion circuit is connected to the output end of the sampling circuit and is used for performing analog-to-digital conversion on a difference value between the in-phase end output voltage and the anti-phase end output voltage to obtain a digital signal corresponding to each sampling; and the digital control circuit is connected to the output end of the conversion circuit and is used for defining the next sampling as the first sampling if the weight bit corresponding to the current digital signal is in a set low weight bit range and the difference between the weight bit and the low weight bit is smaller than a set value during non-first sampling. Through the successive approximation type analog-to-digital converter and the conversion method thereof provided by the invention, the problem of low conversion rate of the existing SAR ADC is solved.
Owner:MICROTERA SEMICON (GUANGZHOU) CO LTD
Capacitance sensor interface circuit based on frequency switching
ActiveCN107395194AReduce processing timeImprove work efficiencyPulse shapingEnergy efficient computingControl theoryHigh capacitance
The invention discloses a capacitance sensor interface circuit based on frequency switching. The circuit is composed of a frequency modulation circuit body based on capacitance change and a frequency voltage switching circuit body; the input end of the frequency modulation circuit body based on capacitance change forms the input end of the whole interface circuit and is connected with a measured capacitor; the output end of the frequency modulation circuit body based on capacitance change is connected with the input end of the frequency voltage switching circuit body; the output end of the frequency voltage switching circuit body forms the output end of the whole interface circuit; the frequency modulation circuit body based on capacitance change converts the measured capacitor value into a frequency value, and then frequency voltage switching circuit body converts the frequency value into a voltage value. The circuit can effectively inhibit the influence of noise on low-frequency positions, frequency signals can be converted into corresponding voltage signals only in a signal input period, the time-delay of outputting is reduced, and the reaction speed of the capacitance sensor interface circuit is greatly improved.
Owner:GUILIN UNIV OF ELECTRONIC TECH
A Pulse Signal Denoising Method Based on Enhanced Gaussian Redundancy Dictionary
ActiveCN110575145BSuppress sparse vectorSuppress high frequency noiseCatheterCharacter and pattern recognitionEcg signalAlgorithm
The invention can effectively suppress noises such as high-frequency noise, low-frequency noise, baseline drift, power frequency interference and myoelectric interference of the pulse signal, and effectively improve the signal-to-noise ratio. The signal after the denoising of the present invention has no unnecessary oscillation, greatly improves the operation efficiency, saves a lot of resources, can be used for low power consumption front-end pulse signal acquisition, and provides a good solution for the further work of subsequent pulse wave feature extraction and classification Effect. The present invention can not only be used to remove the noise of the pulse signal, but also can be used to remove the noise of other signals such as the electrocardiogram signal.
Owner:FUJIAN UNIV OF TECH
Radar having structure able to suppress low-frequency noise
ActiveUS10838039B2Improve accuracySuppress low frequency noiseAntenna adaptation in movable bodiesIndividually energised antenna arraysIn vehicleRadar
A vehicle radar. In the vehicle radar, a high-pass filter is disposed on a signal line connecting a transmitting chip and a receiving chip, the signal line allowing a local oscillation signal to be transferred therethrough. The high-pass filter prevents noise from being introduced through the signal line, along which the local oscillation signal is transferred. This prevents the accuracy of detection from being lowered by low-frequency noise generated from the interior of the vehicle radar. The high-pass filter connected to the signal line is embodied as a variety of configurations, thereby providing a structure able to effectively suppress low-frequency noise while maintaining the existing structure of the vehicle radar.
Owner:HL KLEMOVE CORP
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