51 results about "Noise (electronics)" patented technology

The invention is suitable for the technical field of power electronics, and provides a high-voltage amplifier control method, device and equipment, and the method comprises the steps: generating a dynamic power supply voltage rail, and extracting an error signal output by the dynamic power supply voltage rail and a target; the error signal is decomposed into at least two frequency components, and the frequency components are respectively processed by adopting a differentiated amplification strategy. The processed components are synthesized into a compensation signal, and the compensation signal is superposed with the power supply voltage rail, so that a high-fidelity final output signal is generated. According to the invention, the efficiency is improved through dynamic power supply, the residual error signal is subjected to frequency division, and a differential strategy is adopted for accurate compensation, so that various distortions and noises are effectively eliminated, and the unification of high efficiency and high precision is realized.

The application is suitable for the field of power electronics, and provides a high-voltage amplifier control method, device and equipment. The method generates a dynamic power supply voltage rail, and extracts an error signal of the target output. The error signal is decomposed into at least two frequency components, and is processed respectively by using differentiated amplification strategies. The processed components are combined into a compensation signal, which is superimposed with the power supply voltage rail, so as to generate a final output signal with high fidelity. The application improves the efficiency by using dynamic power supply, and at the same time, the residual error signal is divided into frequency and compensated by using differentiated strategies, so that various distortions and noises are effectively eliminated, and the unification of high efficiency and high precision is realized.

The invention relates to the technical field of biomedical signal processing and medical electronics, in particular to a blood pressure measuring method for non-invasive exercise blood pressure monitoring. The method aims to solve the technical problem of low blood pressure measurement accuracy caused by broadband noise interference and failure of a fixed parameter model in a motion state in the prior art. According to the technical scheme, the method comprises the steps that a cardiac cycle reference signal and a Korotkoff sound signal are synchronously collected, a sampling window is calculated in a self-adaptive mode by utilizing a cycle triggering feature point gating mechanism and combining a heart rate, and time domain precise interception of the signals is achieved; carrying out root mean square calculation and Savitzky-Golay filtering on the intercepted signal, and keeping waveform characteristics while denoising; constructing a multi-dimensional feature regression model containing a peak value, skewness, kurtosis and dynamic template similarity so as to accurately judge systolic pressure and diastolic pressure; an automatic recharging mechanism is triggered by monitoring signal quality, and strong interference is physically avoided. The method has the advantages of being high in anti-noise capacity, high in feature extraction robustness and accurate and reliable in measurement result.

A system for vibration reducing covers for electrical components. The system includes composite covers for electronic components of drive units to reduce vibrations and associated noise during operation of a vehicle. The cover is formed of a composite to dampen oscillations occurring as a result of vibrations from the drivetrain of the vehicle. The cover also includes a thermal pathway for transferring energy as heat from an interior of compartment containing the electronic components to an environment outside the cover. Additionally, the cover can include an electromagnetic interference and / or radio frequency interference shield to prevent interference with other electronic components on and / or nearby the vehicle during operation.

The application discloses a preparation method of a flexible active myoelectric electrode array structure and relates to the field of flexible electronics and active electrode preparation; the structure comprises: a plurality of active electrodes; the plurality of active electrodes are arranged in a horizontal-longitudinal matrix mode; each active electrode comprises: a flexible substrate and an active flexible amplification electrode arranged on the flexible substrate; the active flexible amplification electrode comprises an electrode and a common-source amplification circuit; the electrode and the common-source amplification circuit are in one-to-one correspondence; the electrode and the common-source amplification circuit are connected; the structure realizes synchronous collection of surface myoelectric signals by multiple channels, the flexible substrate enhances the wearability of the electrode, the differential structure, that is, the common-source amplification circuit can improve the interference of common-mode signals, reduce the introduction of noise, improve the signal-to-noise ratio of myoelectric signals, and reduce signal crosstalk between different channels.

Techniques pertaining to new modulation and coding scheme (MCS) levels for next-generation wireless local area networks (WLANs) are described. An apparatus generates a signal using an MCS level not defined in an Institute of Electrical and Electronics Engineers (IEEE) 802.11be specification. The apparatus then performs a wireless communication using the signal. Each of a sensitivity signal-to-noise ratio (SNR) gap and a spectral efficiency gap between two adjacent MCS levels from a combination of the plurality of MCS levels and a plurality of existing MCS levels defined in the IEEE 802.11be specification is less than that between two adjacent MCS levels from the plurality of existing MCS levels.

The invention relates to a satellite-borne fluorescence hyper-spectral detector electronics system with high integration level and high signal-to-noise ratio. A signal processing module is used for controlling the working mode of a detector; receiving a second pulse signal of a satellite GPS subsystem to generate a time count of a frame synchronization signal; carrying out extremely low noise quantization on an analog signal transmitted by the focal plane driving unit; the image data and the auxiliary data are coded and integrated and then sent to a satellite data transmission subsystem; a global clock and a global reset signal are generated and sent to the sequential control unit; the time sequence control unit generates a frame synchronization signal and a clock synchronization signal, and generates a driving time sequence signal of a CCD in the focal plane driving unit; the focal plane driving unit generates various bias voltages required by the work of the CCD; receiving a driving time sequence signal to generate various high-voltage driving signals required by the work of a CCD (Charge Coupled Device); and the CCD output analog signal is output to the signal processing unit after being subjected to power amplification and impedance matching. The signal-to-noise ratio of the system is improved, and the size, weight and power consumption of imaging electronics of the detector are reduced.

The invention discloses an active damping method combining a wave trap with an amplitude attenuator, and relates to the technical field of power electronics. The invention aims to solve the problems that an inherent harmonic peak exists in a method for suppressing switch subharmonics by adopting an LCL type filter, noise at resonant frequency can be amplified, waveform quality is influenced, tracking errors are caused to a current loop of an ultra-precision linear servo system, and the positioning precision of a linear motor is influenced. According to the active damping method combining the wave trap with the amplitude attenuator, the wave trap and the amplitude attenuator are sequentially cascaded to the output end of the inverter, so that the wave trap and the amplitude attenuator form an active damper, and active damping is achieved.

The invention belongs to the technical field of electronics, and provides a signal jitter elimination method and device based on a digital filter, and the method comprises the steps: determining a target parameter of a low-pass digital filter according to the pulse data of a signal to be subjected to jitter elimination; performing quantization processing on the signal to be subjected to jitter elimination to obtain a quantized signal; and judging the quantized signal by using a low-pass digital filter to obtain a judgment result, and determining the signal after jitter elimination according to the judgment result. According to the method and the device, the low-pass digital filter is designed according to the characteristics of the signal to be subjected to jitter elimination, burr signals in the signal can be quickly filtered out, noise jitter is reduced, a complex jitter elimination circuit does not need to be designed, and therefore the efficiency and the universality of signal jitter elimination are improved.

The invention relates to the technical field of microelectronics, and discloses a charge pump current mismatch compensation circuit and method and a phase-locked loop system, and the compensation circuit comprises a time-to-digital conversion module which is connected to a phase frequency detector of a phase-locked loop and is configured to detect the pulse width of an uplink signal and a downlink signal output by the phase frequency detector; the compensation current control module is connected with the time-to-digital conversion module and is configured to generate compensation current based on the uplink signal pulse width and the downlink signal pulse width; wherein the compensation current is configured to be input to a charge pump of the phase-locked loop so as to counteract current mismatch of the charge pump in real time. The problem that dynamic compensation cannot be achieved through static optimization in the prior art is solved, output voltage fluctuation of the loop filter is reduced, the stability and precision of the output frequency of the phase-locked loop system are improved, and meanwhile introduction of noise or limitation of the working range is avoided.

The application discloses a high-polarization-extinction-ratio integrated Y waveguide structure based on a thin film lithium niobate, relates to the fields of microwave photonics, integrated optoelectronics and high-precision inertial sensing technology, and comprises a substrate, a lower cladding layer, a thin film lithium niobate layer and an upper cladding layer from bottom to top; and the polarization extinction ratio of the device is significantly improved according to the application; in view of the problem of poor polarization extinction ratio performance of the current monolithic integrated thin film lithium niobate Y waveguide due to the lack of an on-chip efficient polarization structure, the application creatively utilizes mode parity symmetry for filtering; the energy zero point position of the TE1 mode is determined by the waveguide electromagnetic field eigen equation and does not drift with the external environment temperature or stress; unlike the directional coupler relying on nanoscale gaps or the subwavelength grating with a minimum line width; the end-to-end transmission loss of the polarization and filtering of the application can be controlled at a very low level, so that the optical power margin and the overall signal-to-noise ratio of the fiber-optic gyroscope system detection end are significantly improved.

The invention provides a piezoelectric sensor, a display touch module and electronic equipment, and relates to the technical field of electronics, and the piezoelectric sensor comprises a first piezoelectric layer which is used for detecting the pressure acting on the piezoelectric sensor to generate deformation; the first electrode layer is located on one side of the first piezoelectric layer and used for receiving first charges generated by deformation of the first piezoelectric layer; the second electrode layer is located on the other side of the first piezoelectric layer and used for receiving second charges which are generated by deformation of the first piezoelectric layer and are opposite to the first charges in polarity so as to form response signals with the first electrode layer; the first packaging layer is located on the side, away from the first piezoelectric layer, of the first electrode layer; and the second packaging layer is positioned on one side, far away from the first piezoelectric layer, of the second electrode layer. According to the invention, the signal-to-noise ratio of the response signal of the piezoelectric sensor can be improved.

Sensing element transducers in a sensing system are connected to sensing element electronics by a switchable averaging network. The switchable averaging network may be configured to cause the sensing elements to operate in a sensing mode where the sensing elements all operate independently or in a calibration mode where the connected sensing elements have as an input a uniform signal generated by combining signals from all of the interconnected sensing element transducers. Signals output from the sensing system in the calibration mode may differ from the uniform signal due to unstable FPN (fixed-pattern noise) generated by the sensing element electronics and readout channels. These differences may be derived by comparing the signals output from the sensing system in the calibration mode to the uniform signal, and may be used to reduce FPN.

The utility model relates to the technical field of sensors, in particular to a high-precision double-range current sensor, a closed-loop circuit comprises a self-checking coil SC and a sampling resistor Rm, the self-checking coil SC is used for generating an excitation signal, the excitation signal is converted into an output signal through the closed-loop circuit, and the sampling resistor Rm is connected with the self-checking coil SC. The sampling resistor Rm is used for providing sampling current for the large-current range circuit and the small-current range circuit, and the large-current range circuit is connected to the two ends of the sampling resistor Rm in series; compared with a conventional sensor, according to the scheme, double-path output is adopted, a measured current wire penetrates through the sensor, the functions of amplification and signal conditioning of currents of different ranges are achieved through two paths of operational amplifiers, an external auxiliary circuit is matched, and therefore the function of high-precision double-range current measurement is flexibly achieved; according to the scheme, the current sensor adopts a closed-loop scheme to improve the signal-to-noise ratio and the detection precision, and is very suitable for occasions of high-precision current detection in a power electronic system.

The invention relates to the technical field of power electronics, discloses an on-line monitoring method for performance degradation of an inverter, and is used for solving the problems of high working condition noise, large environment drift and difficulty in early degradation monitoring in the prior art. According to the method, in the PWM dead zone time of the inverter, detection pulses are injected into a power device, electromagnetic and acoustic responses of the power device are synchronously collected, and a two-dimensional acoustic-electric resonance fingerprint is constructed. A variational auto-encoder is used to learn health fingerprint data, and a health baseline model representing a normal state is established. During on-line monitoring, measurement is dynamically calibrated through environment anchor points obtained in real time, drift influences such as temperature are eliminated, the difference between a real fingerprint and a model reconstruction fingerprint is calculated, and a physical degradation index is obtained. Through active silent detection and dynamic environment compensation, the device has strong anti-interference performance and high stability, and can realize high-sensitivity early warning for physical degradation of the device.

The invention discloses a switching power supply peak signal detection method based on improved CFAR, and belongs to the technical field of signal processing and power electronics. The method comprises the following steps: controlling superposition of high-frequency ripples and noise through a dynamic random switching sequence, generating a transient peak in combination with a Gaussian pulse model, and synthesizing a high-trueness interference signal; designing a band-pass filter and a cross-correlation alignment algorithm to realize signal preprocessing and time domain alignment; multi-dimensional similarity evaluation indexes (a time domain correlation coefficient, dynamic time warping and spectrum energy similarity) are proposed to quantize signal features; an improved CFAR (Constant False Alarm Rate) detection algorithm is combined with a clustering matching strategy, and the detection precision and robustness of the transient peak are improved. The method can be applied to interference simulation, fault diagnosis and signal quality evaluation of power electronic equipment, and has the advantages of high-fidelity signal generation and low false alarm rate detection.

The invention relates to the technical field of on-chip self-calibration of chips, in particular to an on-chip self-calibration method and system for a high-disturbance-rejection CAN transceiver chip. The noise level of the environment where the chip is located is monitored in real time; determining an adjustment value of the driving parameter based on the noise level; and the driving parameters are adaptively adjusted according to the adjustment values so as to optimize the signal integrity and the anti-interference capability. The system comprises a noise monitoring module, a parameter calculation module and a parameter adjustment module which are integrated in a chip. The innovation point of the invention lies in that on-chip real-time self-calibration is realized, no external equipment is required to participate, and the signal quality is dynamically optimized in a complex electromagnetic environment in a mode of combining periodicity and event triggering. According to the method, the anti-interference capability and the signal integrity of the CAN bus can be remarkably improved, the communication error rate is effectively reduced, meanwhile, the method has the advantages of low power consumption, fast response, high integration level and the like, and the method is particularly suitable for occasions such as automotive electronics with strict requirements on reliability.

The invention discloses a sensing fabric with a microbridge structure and a preparation method thereof, and belongs to the technical field of wearable flexible electronics and electronic fabrics. The sensing fabric with the microbridge structure is prepared on a non-woven substrate which is approximately uniform in all directions through the collaborative design of PDA interface adhesion enhancement, CNT conductive network construction and PPy in-situ polymerization; micro-cracks are controllably generated when the carbon nanotubes are pulled, and a micro-bridge conductive path is formed by bridging the CNTs among the cracks; response splitting and double peaks caused by warp and weft orientation are reduced by the non-woven substrate; pDA improves interface bonding, CNT constructs a cross-fiber continuous network, and it is guaranteed that a conductive path is stable; the micro-crack-micro-bridge mechanism realizes an electro-mechanical response of'amplification without breaking, recoverable and repeatable 'in stretching / springback, so that high sensitivity, low hysteresis, fast response and high cycle stability are considered in a strain range of more than or equal to 100% (preferably-150%), the in-plane consistency and the signal-to-noise ratio are remarkably improved, and the method has a very good application prospect.

The invention relates to the technical field of vehicle-mounted electronics, in particular to a vehicle-mounted video interference suppression method and system based on EMC optimization, and the method comprises the steps: building a transmission reference model; comparing the model with a composite signal on a transmission link in real time, extracting a holographic electromagnetic wave interference component through holographic differential processing, analyzing an amplitude-phase transfer function, and generating a reverse holographic electromagnetic wave through phase conjugate inversion; reverse holographic electromagnetic waves are coupled and injected into a link through a distributed holographic modulation array, and coherent cancellation is carried out on the reverse holographic electromagnetic waves and original interference; residual interference is monitored at the downstream of the link, and the offset effect is dynamically optimized through an adaptive weight updating algorithm. According to the invention, channel noise in a transmission link is eliminated from the source through active cancellation, the technical problem that a video signal is submerged by noise before reaching a receiving end in a strong electromagnetic interference environment is solved, and the suppression effect under complex and changeable working conditions is ensured through a self-adaptive closed-loop system. And the transmission reliability and fidelity of the vehicle-mounted video signal are obviously improved.

Method for controlling an electric traction drive, comprising a magnet-free electric machine (1) and power electronics (2), wherein the power electronics comprise at least a multi-stage inverter and / or at least an ARCP inverter, wherein, to generate a noise, an input signal (U1, V1, W1) for the power electronics (2) of the magnet-free electric machine (1) is varied by varying a signal in a rotor-fixed coordinate system corresponding to a predetermined torque request (T). ref ) torque-generating current (I q,ref ) or a corresponding voltage (u q,ref ) and / or a magnetic field-weakening current (I) for a given torque requirement d,ref ) or a corresponding voltage (u d,ref ) with a defined, torque-generating current based on a desired acoustic signal (I q,sg ) or a corresponding voltage (u q,sg) and / or a defined magnetic field weakening current based on a desired acoustic signal (I d,sg ) or a corresponding voltage (u d,sg ) is superimposed. and a device (3) designed to carry out the procedure.

The invention relates to the technical field of electronics, and discloses a pulse circuit, a PCB and a chip, and the pulse circuit comprises an input unit, a reverse unit, a filtering unit, a hysteresis unit, a driving enhancement unit, a logic control unit and an output unit. The input unit is electrically connected with the reverse unit and the filtering unit; the reverse unit is electrically connected with the filtering unit and the logic control unit; the filtering unit is electrically connected with the delaying unit, the delaying unit is electrically connected with the driving enhancement unit, the driving enhancement unit is electrically connected with the logic control unit, and the logic control unit is electrically connected with the output unit; according to the improved anti-interference circuit provided by the invention, the hysteresis unit and the driving enhancement unit are introduced, so that the stable hysteresis characteristic and strength of the pulse signal are improved, the pulse circuit can provide more stable and more accurate signal processing capability in a noise environment, and the overall performance and reliability of the circuit are remarkably improved; the problem that the performance of an existing pulse circuit is reduced in a high-noise environment is solved.

The invention discloses an adaptive volume control method for a commercial vehicle, and belongs to the technical field of vehicle electronics. According to the method, a hardware system comprising a microcontroller, an audio processing module and an environment noise detection module is constructed, and a multi-task software system is operated on the microcontroller, so that volume self-adaptive adjustment based on real-time environment noise is realized. The environment noise detection combines two modes of microphone direct acquisition and non-microphone indirect analysis (through loudspeaker back electromotive force difference). And the system respectively executes self-adaptive volume control logic of the external horn, the internal integral horn and the internal local horn according to a preset threshold value and a coefficient. The system can automatically adapt to different noise environments, effectively reduces the operation burden of a driver, improves the driving safety, optimizes the audio hearing definition and comfort inside and outside the vehicle, and enhances the use compliance of the loudspeaker outside the vehicle.

The invention discloses an integrated waveform acquisition and diagnosis method based on a desktop digital energy spectrum analyzer. The analyzer comprises a host shell and an electronics system integrated in the host shell. And the host shell consists of a host box and an inclined digital display box fixed on one side of the host box. A display screen and a plurality of parameter regulation and control keys are embedded in the front end of the digital display box; and one side of the host box is also provided with a commercial power access jack, a pre-discharge power supply interface, a pulse signal interface and a high-voltage power supply interface. Based on the analyzer, the invention also provides a waveform diagnosis method. The core of the method is as follows: when the energy spectrum performance is poor, an operator can synchronously observe the pulse original waveform, the digital forming process and the energy spectrum result so as to analyze a noise source or algorithm defects; and the pre-amplifier, high voltage or digital processing parameters are adjusted in real time through a parameter control key, and iterative optimization is carried out until the energy spectrum performance reaches the standard, so that rapid and visual fault diagnosis and system optimization are realized.

The active damping method of the wave trap combined with the amplitude attenuator relates to the field of power electronics. The application is to solve the problem that the method of using LCL type filter to suppress switching harmonic has inherent resonance peak, which can amplify noise at the resonance frequency, affect the waveform quality, and further cause tracking error of the current loop of the ultra-precision linear servo system and affect the positioning accuracy of the linear motor. The active damping method of the wave trap combined with the amplitude attenuator cascades the wave trap and the amplitude attenuator to the output end of the inverter in sequence, so that the wave trap and the amplitude attenuator constitute an active damper to realize active damping.

The invention relates to the technical field of power electronics, and discloses an active noise cancellation method based on an FXLMS algorithm and related equipment, and the method comprises the steps: initializing system parameters; generating a primary noise signal based on the system parameter, and generating a primary sound wave corresponding to the primary noise signal through an acoustic system; acquiring a reference signal and an error signal based on the primary sound wave, and performing signal processing to obtain a signal result; updating a filter weight coefficient according to a processing result; and judging the filter weight coefficient through a convergence condition to obtain a judgment result, and carrying out active noise cancellation based on the judgment result. Through the improved FXLMS algorithm, the accuracy and consistency of the combination time of the primary noise signal and the anti-noise signal are improved, the noise cancellation effect is optimized, and the overall performance of the system is remarkably improved.

The present application relates to the field of particle physics experiment data acquisition and processing, and specifically discloses an online AI triggering and data compression method and device for particle detector readout electronics, wherein the method realizes real-time feature extraction on the output pulse signal of the detector, uses a pre-trained fully connected neural network model to realize high-precision triggering decision, adopts a compression strategy combining adaptive quantization and entropy coding to compress effective event data, and simultaneously introduces a quality feedback mechanism based on peak signal-to-noise ratio to form a closed-loop control. The present application realizes intelligent collaborative processing of triggering decision and data compression, significantly improves the event selection efficiency and data compression quality under the premise of ensuring data physical integrity, and provides an efficient real-time data processing solution for high-count-rate particle physics experiments.

The invention discloses a photoelectric volume pulse wave detection system based on a vertical cavity surface emitting laser, which is characterized in that a multi-wavelength VCSEL (vertical cavity surface emitting laser) is used as a core light emitting unit and is matched with a signal processing module, an embedded control module and an AI (artificial intelligence) sign analysis module to construct an integrated detection framework. According to the system, stable lasing is realized by optimizing a VCSEL epitaxial structure and a preparation process; a multi-wavelength PPG signal is accurately acquired in cooperation with a low-noise amplification-multistage filtering-adjustable gain signal processing link; the embedded control module dynamically adjusts light source parameters, and the AI engine realizes real-time accurate calculation of health parameters through multi-dimensional feature extraction and integrated learning model and fusion of multi-wavelength signals. The system has the advantages of high integration level, low power consumption and strong anti-interference performance, the core unit is packaged compactly, the system adapts to the long endurance requirement of wearable equipment, the detection precision is obviously improved compared with the traditional LED equipment, and a high-cost-performance solution can be provided for the scenes of consumer electronic health management, primary medical screening and the like.

The present application relates to nuclear radiation detection and nuclear electronics technical field, specifically to a kind of radiation field dose self-discrimination detection system and method;It contains double-channel signal acquisition circuit, phase space mapping and manifold curvature entropy analysis module;System utilizes original signal and analog differential signal to construct real-time phase space trajectory, and introduces reference particle attractor model;Its core is to calculate trajectory manifold curvature entropy and carry out hierarchical discrimination: low entropy is determined as single particle, high entropy is determined as accumulation distortion and triggers inverse calculation repair process to deconstruct it;Finally, the energy is updated dose library by phase space closed loop volume integral calculation;The present application uses hardware differentiation to avoid digital quantization noise, ensures that trajectory topological surface is smooth, and significantly improves the measurement accuracy under high dynamic range.

The invention relates to the technical field of vehicle-mounted electronics, and discloses a vehicle-mounted display screen anti-interference method and system. The method comprises the following steps: acquiring a cable common-mode interference signal through a sensor array; an interference frequency distribution spectrum is generated through preprocessing and spectrum analysis; identifying a high-power interference frequency band set; if the transmission frequency is overlapped with the current transmission frequency, calculating an alternative range and selecting a frequency band which has the lowest power and meets a signal-to-noise ratio threshold as a target frequency; the working frequency of the transmission module is dynamically reconfigured; obtaining a signal quality index after switching, and judging whether further optimization is needed or not by comparing the distortion degree; residual interference is suppressed, a real-time feedback index is extracted, and if the real-time feedback index exceeds a stability threshold value, high-power frequency points are recognized again, and closed-loop adjustment is formed. According to the invention, real-time sensing and frequency adaptive avoidance of dynamic electromagnetic interference are realized, and the data transmission stability and reliability of the vehicle-mounted display screen are improved.

The application discloses a high-sensitivity arc fault detection method and a solid-state power controller, and relates to the technical field of power electronics. In the method, the solid-state power controller first extracts a current mutation characteristic component through time-frequency analysis, and then calculates a signal-to-noise ratio of the current mutation characteristic component and an original current signal. When the signal-to-noise ratio is lower than a preset threshold, it is judged that an arc fault characteristic in the signal is covered by noise. At this time, the solid-state power controller performs weighted enhancement processing on voltage and current signals by using an enhanced weight coefficient, the weight coefficient is calculated based on a ratio of a preset reference amplitude to an amplitude of the current mutation characteristic component, and the weak fault signal is adaptively amplified. Through the intelligent enhancement processing, the arc fault characteristic originally submerged by noise is exposed, so that the solid-state power controller can detect the weak arc fault signal in a high-noise environment, and the sensitivity of arc fault detection is improved.