103 results about "Noise (electronics)" patented technology

The invention belongs to the field of star flash mouse communication, and discloses a star flash mouse low-power-consumption communication system and method based on Polar code and SLE collaborative optimization, the system adopts a layered architecture design, collaborative optimization of energy efficiency and performance is realized through deep coupling of a physical layer and a link layer, and the performance of the system is improved. The core of the system is composed of three functional units including a Polar code coding module, an SLE control engine and a cross-layer optimization interface, and a complete closed-loop control system is formed. According to the invention, through deep cooperation of the Polar code and the SLE mechanism, the overall power consumption is reduced by 42.7% compared with the traditional scheme; according to the Polar code dynamic construction method based on track prediction, an ultra-low bit error rate of 10 <-5 > magnitude can still be kept in a 2.4 GHz complex interference environment, and in combination with signal-to-noise ratio self-adaptive coding parameter adjustment, it is ensured that transmission delay within 0.5 ms is always kept from a low-speed office scene to a high-speed electronic sports scene; in the aspect of engineering implementation, the method has the capability of quickly adapting to hardware platforms of different manufacturers, and a complete solution with high performance and low cost is provided for large-scale commercial use of the satellite flash technology in the consumer electronics field.

The invention belongs to the technical field of radio electronics and signal processing, and particularly relates to a color noise environment signal frequency domain detection method and system based on spectrum envelope extraction, and the system comprises a signal acquisition unit, a signal conversion unit, a signal judgment unit and a signal output unit. The method is a research summary of a color noise environment signal frequency domain detection algorithm based on spectrum envelope extraction, and the algorithm is used for blind signal detection under the conditions of uneven noise spectrum and broadband reception, has good robustness, can be used for low signal-to-noise ratio occasions, and is high in signal detection accuracy.

The invention discloses a K-band amplitude-limiting low-noise amplifier, and belongs to the technical field of radio frequency microelectronics. The circuit comprises an input matching module, a diode amplitude limiting module, an inter-stage matching module, a low-noise amplification module and an output matching module which are cascaded in sequence, the input matching module is used for realizing impedance matching between a radio frequency signal input end and the diode amplitude limiting module and transmitting a radio frequency signal; the diode amplitude limiting module is used for limiting the amplitude of the radio frequency signal and transmitting the radio frequency signal; the inter-stage matching module is used for realizing impedance matching between the diode amplitude limiting module and the low-noise amplification module; the low-noise amplification module is used for carrying out amplification processing on the radio frequency signal after amplitude limiting and transmitting the radio frequency signal; and the output matching module is used for realizing impedance matching between the low-noise amplification module and the radio frequency signal output end and outputting the amplified radio frequency signal. According to the invention, the amplitude of the input signal can be limited, so that the amplitude is kept in a bearable range of the low-noise amplification circuit, and the stability and reliability of the whole system are ensured.

The invention discloses a digital stethoscope system based on a piezoelectric film, and relates to the technical field of medical electronics and biomedical engineering. An existing digital stethoscope based on a piezoelectric film has the challenges of signal noise and interference, limitation of a signal processing algorithm, nonlinear response and time migration, insufficient diagnosis accuracy and automation and the like. A piezoelectric film and microphone dual audio acquisition mode is fused, various physiological signals such as low-frequency vibration and high-quality heart and lung sound are captured, and background noise is removed through a self-adaptive filter and a frequency spectrum subtraction technology; an MFCC feature extraction and dynamic time warping algorithm is utilized to carry out fine feature analysis and time axis alignment on the preprocessed audio signal, and high-precision matching with a storage template is realized; different physiological states are accurately distinguished through intelligent feature processing, real-time and visual diagnosis feedback is achieved through wireless transmission and state indication, and the reliability and efficiency of medical detection are improved.

The invention provides a time delay interference ground semi-physical experiment verification scheme, which comprises the following steps of: (1) based on a space gravitational wave detection task and a load configuration scheme, acquiring core measurement of the space gravitational wave detection task, and recording measurement data; (2) constructing an algebraic relationship of a time delay interference scheme for effectively eliminating secondary noise such as laser frequency noise and optical platform jitter, and calculating according to the algebraic relationship to obtain a solution of first-generation time delay interference and a solution of first-generation basic combination; and (3) repeating the step (2) for multiple rounds to compensate the difference of the equivalent interference measurement arm length and further suppress the laser frequency noise. The half-physical simulation platform is reasonable in conception, the half-physical simulation platform of the Michelson interferometer with the unequal arms and equivalent to the million kilometer arm length is built by combining an arm locking frequency stabilization system and an electronic phase time delay system, and effective suppression of laser frequency noise is achieved.

The invention relates to the technical field of microelectronics, and provides an MEMS microphone and a preparation method thereof, and an electronic device, the microphone comprises a substrate, the substrate comprises a first wafer and a first sacrificial layer, the first wafer is provided with a sealed cavity diaphragm, the first sacrificial layer is used for separating the sealed cavity diaphragm from the first wafer, and the substrate comprises a sound transmission hole penetrating through the first wafer and the first sacrificial layer; a second wafer on which a back plate is prepared; wherein the first wafer and the second wafer are bonded in a low-pressure environment, so that the sealed cavity vibrating diaphragm and the back plate form a capacitor. According to the method, the signal-to-noise ratio of the microphone is improved, and the reliability of the MEMS microphone is enhanced.

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 invention relates to the technical field of low-power-consumption electronics, and discloses a low-power-consumption instantaneous frequency measurement system which comprises a radio-frequency signal acquisition module, a signal time-frequency conversion module, a noise floor coding module and the like. The system generates a feature tensor through time-frequency analysis of a radio frequency signal, realizes dynamic threshold fusion in combination with noise floor sparse coding, extracts a multi-scale transient frequency feature by using a pyramid convolutional neural network, dynamically suppresses noise based on a signal-to-noise ratio weight, and reconstructs a real-time spectrum distribution image. The power consumption control module can adjust the ADC sampling rate and the clock frequency of the processing unit according to the signal strength, and the power management unit adopts multi-voltage domain independent power supply. The system solves the problems of frequency measurement precision and power consumption under complex noise, is suitable for the fields of wireless communication and the like, and has the characteristics of high precision, low power consumption, high spectral resolution, visualization and intuition.

The invention discloses a miniaturized monolithic integration method of a geomagnetic sensor and an MCU (Microprogrammed Control Unit). The method comprises the following steps of (1) low-temperature CMOS circuit layer preparation, (2) TSV three-dimensional interconnection structure processing, (3) magnetic-core-free planar coil manufacturing, (4) low-temperature electromagnetic shielding layer integration and (5) structure release and vacuum packaging. Process conflicts and hysteresis errors introduced by ferromagnetic materials are eliminated through a non-magnetic-core design, a TSV (through silicon via) three-dimensional interconnection technology is adopted to replace traditional plane wiring, the size of the module is compressed to the millimeter level, meanwhile, a broadband electromagnetic shielding layer is integrated, and it is ensured that in a weak magnetic field (lt; and the signal-to-noise ratio in a detection scene is greater than or equal to 30dB. The low-temperature compatibility with a CMOS (complementary metal oxide semiconductor) process can be realized, the mass production feasibility needs to adapt to a standard semiconductor production line, the cost of a single chip is reduced by more than 30%, and the method is suitable for navigation equipment, consumer electronics and industrial sensing systems.

The invention discloses a small signal detection circuit, device and method, and belongs to the technical field of power electronics. The circuit comprises an amplitude adjusting module, a signal conversion module and a control module which are connected in sequence, and further comprises a receiving module, the input end of the amplitude adjusting module is connected with the first output end of the receiving module, and the output end of the control module is connected with the control end of the receiving module. The signal conversion module comprises a detector and a comparison sub-module which are connected in sequence; under the condition that the receiving module receives a first radio frequency signal, the receiving module samples the first radio frequency signal to obtain a coupling signal, the coupling signal is output through a first output end, the amplitude adjusting module attenuates or amplifies the coupling signal to generate an adjusting signal, and the adjusting signal is output through a second output end. The detector performs power detection on the adjustment signal to generate a detection signal, the comparison sub-module compares the detection signal to generate a comparison signal, and the control module determines the power range of the first radio frequency signal according to the comparison signal, generates a control signal and outputs the control signal to the control end of the receiving module. And the receiving module is used for adjusting the gain of the first radio frequency signal according to the control signal, generating a second radio frequency signal and outputting the second radio frequency signal through a second output end. The circuit can realize linear response, has high resistance to noise and interference, and can perform small signal detection.

The invention relates to the technical field of electronics, in particular to a multichannel active noise reduction algorithm testing device based on a synchronous acquisition card, which comprises a signal generation module used for generating a test signal, an output module used for outputting the test signal and acquiring a recovery signal, and a loudspeaking module used for outputting a corresponding audio frequency, the system comprises an acquisition module used for acquiring audio and main noise in the environment and generating an acquisition signal, a synchronization module used for synchronizing the signal, a noise reduction module used for generating an anti-noise signal, an analysis module used for judging whether the noise reduction effect is qualified or not, judging the reason for not meeting the standard and generating a corresponding processing instruction, and a processing module used for processing the processing instruction. And the control module is used for adjusting the operation parameters of the parts in the corresponding module to corresponding values. The problem of signal delay caused by testing equipment is solved, the effect after noise reduction is monitored in real time, the operation parameters of the noise reduction device are accurately adjusted based on the effect after noise reduction, and the operation efficiency of the active noise reduction device is improved.

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.

To provide a system and a method for boosting a signal level to increase a signal-to-noise ratio of an electric subsystem using a piezoelectric transducer and transistor electronics.SOLUTION: A transceiver device is used to maximize voltage. A piezoelectric multilayer body 100 includes a substrate 109 having a first surface and a second surface facing each other, a first layer 105 of one or more piezoelectric transducers that is attached to the first surface of the substrate, a buffer layer 104 attached to the first layer, and a second layer 103 of one or more piezoelectric transducers that is attached to the buffer layer. The first layer and the second layer are connected in cascade through vias 110 and 111.SELECTED DRAWING: Figure 2A

A control method of an electronic device capable of generating anti-noise for acoustic noise cancellation (ANC) is disclosed. The control method of the electronic device comprises the following steps: acquiring audio data and metadata of the audio data; classifying the audio data into a plurality of audio clusters based on features of the audio data and features of the metadata; detecting whether the plurality of audio clusters are respectively included in a plurality of pre-stored noise clusters; and adding information on audio clusters not included in the plurality of noise clusters among the plurality of audio clusters to the information on the plurality of noise clusters.

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 provides a wave trap comprising three switched capacitor arrays, and relates to the field of microelectronics and solid-state electronics. The circuit is applied to the fields of microelectronics and solid-state electronics, in particular to low-noise and low-offset circuit systems in the fields. According to the switched capacitor wave trap, a large resistor and a large capacitor are not needed to adjust the wave trapping frequency, only corresponding clock signals need to be added, filtering can be achieved at the specified frequency, and static power consumption does not exist. The device has the advantages of small area, low power consumption, simple structure, high PVT resistance and the like. Simulation results show that the low-frequency gain of the wave trap is 404.497 mdB, the high-frequency notch gain of the wave trap is-91.102 dB, harmful high-frequency components at specific frequencies in signals can be well filtered out, and useful low-frequency signal components are reserved.

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 present application discloses a method, apparatus, device and medium for grouping and aggregating power line communication subcarriers, including obtaining the topological noise information of multiple subcarriers in a power line communication network, where the topological noise information includes the topological change rate, noise change rate, noise power and noise type; calculating the signal-to-topology-plus-noise ratio (STNR) change time series of each subcarrier according to the topological noise information; comparing the STNR change time series with a preset STNR threshold to determine the available subcarriers among the multiple subcarriers; and performing grouped allocation of the available subcarriers based on the value gain of the available subcarriers in multiple node groups. The present application takes into account the colored noise and topological change rules of the communication network in the scenario of high proportion of power electronics access, and also considers the value gain of different node groups for the available subcarriers, so as to meet the adaptation requirements between the power electronics access scenario and the available subcarriers, network resources and communication nodes.

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 a whole satellite verification method and system for electromagnetic compatibility of an SAR load and satellite platform radio frequency equipment. The method comprises the following steps: respectively carrying out power-on self-test on the satellite platform radio frequency equipment, load comprehensive electronics, the SAR load and a system consisting of the satellite platform radio frequency equipment and the load comprehensive electronics; a beam pointing angle of an SAR load and a beam scanning angle of satellite platform radio frequency equipment are set, receiving noise of the SAR load is recorded, the influence condition of the satellite platform radio frequency equipment on the SAR load can be determined according to a noise test result, and the influence of the satellite platform radio frequency equipment on the SAR load is quantitatively verified by replacing a full array with an SAR antenna sub-array, so that the influence of the satellite platform radio frequency equipment on the SAR load is verified. Therefore, the problem that the SAR load influence cannot be quantified during the whole-satellite test is solved, the verification of the whole-satellite radio frequency compatibility is ensured, the risk and cost of whole-satellite development are reduced, and meanwhile, the progress requirement is met.

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.