33results about "Electrical apparatus interference reduction" patented technology

The invention discloses an unmanned aerial vehicle noise elimination method and device for cross-medium direct acoustic communication, and the method comprises the steps: carrying out the sampling of a known detection signal and a receiving signal, obtaining a frequency domain expression, calculating a cross-medium sound pressure transmission function, and extracting amplitude response, phase response and group delay; based on a normalization ratio and local maximum detection method, identifying a center frequency set of unmanned aerial vehicle propeller noise; the notch depth, bandwidth, frequency compensation and phase compensation are determined by combining channel characteristic parameters, and a cascade notch filter is constructed; and inputting the channel characteristic parameters into the deep learning model, outputting a filter parameter correction amount, realizing dynamic updating of the filter, obtaining the filter capable of suppressing noise, and further obtaining a denoised communication signal. According to the invention, precise detection of propeller noise frequency and multi-dimensional adaptive adjustment of filter parameters can be realized.

A method of protecting an RF system from destructive effects of hazardous electromagnetic interference (EMI) comprises separating incoming electromagnetic radiation including hazardous electromagnetic interference according to frequency into low frequency spectral components below a selectable cutoff frequency and high frequency spectral components above the selectable cutoff frequency, and routing the low frequency portion of spectral components which include a vast majority of energy contained in the hazardous electromagnetic interference to ground via a low impedance conductor.

The utility model relates to the field of communication equipment, in particular to anti-interference communication transmission equipment. The device comprises a shielding shell, a plurality of interfaces, a data connector, a shielding layer and a partition plate, the shielding shell comprises an outer layer, a middle layer and an inner layer, the outer layer is connected to the inner side in a sleeved mode, the middle layer is located between the inner layer and the outer layer, the multiple interfaces are formed in one side of the shielding shell, and the data connector is inserted into any one of the multiple interfaces. The shielding layer is connected to the outer layer of a cable of the data connector in a sleeved mode, the partition plate is arranged in an inner containing space of the shielding shell and divides the shielding shell into a power source area, a signal processing area and a transmission area, the power source area is communicated with the interfaces, and the signal processing area is communicated with the transmission area. The signal processing area and the transmission area are both located on one side of the power supply area.

A communication system for use in a vehicle includes a first communication device configured for operation in the vehicle, and a second communication device configured for operation in the vehicle. A cable assembly communicatively couples the first communication device with the second communication device. A signal suppressing device is coupled to the cable assembly at a location proximate to an end of the cable assembly. The signal suppressing device is configured to suppress signals in a frequency range corresponding to in-band radiated emission (RE).

The application discloses a signal transmission device and an electrical appliance, and relates to the technical field of electromagnetic compatibility, wherein the signal transmission device comprises a first lead-out wire and a second lead-out wire, an input end of the first lead-out wire is connected with a first device, and an output end of the first lead-out wire is connected with a second device; the second lead-out wire has a first reference point, and an input end of the second lead-out wire is connected with the first device; at least part of the first lead-out wire is arranged close to the first reference point of the second lead-out wire, and after the first lead-out wire is arranged close to the first reference point of the second lead-out wire, electromagnetic waves in the first lead-out wire and electromagnetic waves in the second lead-out wire are coupled with each other. The technical scheme provided by the application aims to shorten the distance between the first lead-out wire and the second lead-out wire, so that electromagnetic waves of the two are coupled, thereby realizing the miniaturized design of the electronic device while reducing electromagnetic interference.

A communication control device is configured to select a communication frequency band for communicating between a vehicle and an external base station when starting communication between the vehicle and the external base station. In selecting the communication frequency band, the communication control device measures or determines the amount of electromagnetic noise in each frequency band inside the cockpit module, and including the communication frequency band. Then, the communication control device identifies an electrical device that is a source of the electromagnetic noise based on frequency bands in which the amount of electromagnetic noise is greater than or equal to a predetermined value. The communication control device sets an operating clock frequency of the electrical device to a first frequency band that differs from the communication frequency band.

Systems, methods, and instrumentalities are disclosed for transmitting a message. For example, a first radio access technology (RAT) and / or a second RAT may be determined. The first RAT may be determined for reception of data. The second RAT may be determined for the reception of the data, perhaps for example based on an indication received via the first RAT. The data may be received via a first node associated with the first RAT and a second node associated with the second RAT.

Provided are: a radio wave absorber which has sufficient radio wave absorption characteristics in a higher frequency band of 20-300 GHz, and is capable of self-standing while having an area of at least a certain size; and a radio wave absorbing device using said radio wave absorber. This radio wave absorber comprises: a radio wave absorbing layer 1; and a reinforcement layer 2 disposed on the radio wave 10-incident surface side of the radio wave absorbing layer, wherein the radio wave absorbing layer contains resin binders 1c and at least one among magnetic iron oxide powders 1a, which magnetically resonate in a frequency band of 20-300 GHz, and carbon-based fine particles 1b, the reinforcement layer 2 is formed of a dielectric material, and said radio wave absorber has a plate shape in which the thickness is smaller than the principal surface, and can be self-standing.

A communication system in a vehicle includes a first communication device having a first ground, and a second communication device having a second ground. A shielded cable communicatively connects the first communication device and the second communication device. The shielded cable includes i) a signal wire that is electrically connected to the first communication device and the second communication device, and ii) a shield that is electrically coupled to the first ground and the second ground. A first wire electrically connects the first ground to a chassis of the vehicle at a first point. A second wire electrically connects the second ground to the chassis proximate to the first point to mitigate effects of electromagnetic interference (EMI) on the communication system.

The present invention provides a common-mode transient suppression protection circuit for a digital isolator, including a modulation circuit, a demodulation circuit and an isolation capacitor connected between the modulation circuit and the demodulation circuit. The modulation circuit includes a modulation circuit front-end and a drive circuit, which are connected in sequence, and a clamping module is arranged in the drive circuit. The protection circuit further includes a linear voltage regulator structure connected with the drive circuit, and a power supply clamp is arranged in the linear voltage regulator structure. By providing the linear voltage regulator structure having the power supply clamp and the drive circuit having the clamping module in the protection circuit, low-voltage devices in the drive circuit can be protected from being damaged by high-voltage signals generated by common-mode transient interference.

An apparatus, namely an infrared (IR) interference shield, is described that can be utilized with a vehicle that employs hydrogen fueling, such as a fuel cell electric vehicle (FCEV). For example, the IR interference shield is mounted onto the vehicle's hydrogen fueling receptacle. The IR interference shield is distinctly structured to reduce or prevent interference of IR wireless communication between a vehicle-side IR transmitter on the receptacle, and an IR receiver of the hydrogen fueling station. The IR interference shield can block interference to IR signals that may negatively affect IR wireless communication between the hydrogen fueling station and the vehicle. Thus, the IR interference shield improves reliability of the communication between the vehicle and the hydrogen fueling station, thereby improving the overall effectiveness and efficiency of the hydrogen refueling process.

The invention relates to the technical field of anti-interference signal transmission, in particular to an anti-interference signal transmission method for a robot connector, and the method comprises the steps: analyzing the cross correlation between a common-mode voltage signal and a differential voltage signal, and the change condition of the common-mode voltage signal, determining the interference conversion accumulation degree of the robot connector, and determining the interference conversion accumulation degree of the robot connector; determining a distortion accumulation risk value; and on the basis of the change condition of the common-mode voltage signal at each moment and in combination with the distortion accumulation risk value, determining a compensation current at each moment so as to suppress the coupling of the common-mode voltage signal of the robot connector to the differential voltage signal. The problem of signal distortion caused by insufficient common-mode rejection capability of the robot connector in a strong electromagnetic interference environment is solved, conversion from common-mode interference to differential-mode interference is suppressed through dynamic monitoring and real-time compensation current generation, and the stability and anti-interference capability of signal transmission are improved.

In described examples, a radar hardware accelerator (HWA) (125) includes a fast Fourier transform (FFT) engine including a pre-processing block (211) for providing interference mitigation, finite impulse response (FIR) filtering, and / or multiplying a radar data sample stream received from ADC buffers (120) within a split accelerator local memory that also includes output buffers (130) by a pre-programmed complex scalar or a specified sample from an internal look-up table (LUT) to generate pre-processed samples. A windowing plus FFT block (windowed FFT block) (212) is for multiply the pre-processed samples by a window vector and then processing by an FFT block for performing a FFT to generate Fourier transformed samples. A post-processing block (213) is for computing a magnitude of the Fourier transformed samples and performing a data compression operation for generating post-processed radar data. The pre-processing block (211), windowed FFT block (212) and post-processing block (213) are connected in one streaming series data path.

The present application relates to the technical field of data processing, and more particularly to a clinical diagnosis and treatment data encryption input method based on a blockchain, which determines an interference cross coefficient by analyzing interference source data, determines a propagation path coefficient by analyzing a propagation point and a relative distance, calculates a static interference eigenvalue based on the interference cross coefficient and the propagation path coefficient, determines a dynamic interference eigenvalue by analyzing a diagnosis and treatment sampling sequence and an interference source sampling sequence, calculates a data interference representation value based on the static interference eigenvalue and the dynamic interference eigenvalue, and divides the interference tendency of diagnosis and treatment data; for weak interference tendency, a propagation distortion coefficient is determined by analyzing a propagation path, an environmental influence coefficient is determined by analyzing environmental data, a data input index is calculated in combination with the data interference representation value, the input state of diagnosis and treatment data is determined, and inputtable data is encrypted and input to the blockchain. The present application improves the accuracy of data chaining and the reliability of data by quality evaluation of clinical data before input.

A self-interference cancellation device includes processing circuitry configured to acquire a plurality of nonlinear bases from a transmit signal, select a subset including at least a portion of the plurality of nonlinear bases, acquire a plurality of orthogonal nonlinear bases based on performing orthogonalization on the subset, estimate a self-interference signal based on the plurality of orthogonal nonlinear bases, and cancel the self-interference signal from a receive signal.

This refrigerator comprises: a storage chamber; a motor; a door configured to open and close the storage chamber; a compressor configured to supply cold air to the storage chamber, wherein the compressor is configured to compress a refrigerant by using rotation of the motor; a first printed board assembly (PBA) including a first communication circuit and a first processor, the first communication circuit including a first low-pass filter including a first variable resistor and a first variable capacitor, and the first processor being connected to the first communication circuit; and a second PBA including a second communication circuit and a second processor, the second communication circuit including a second low-pass filter including a second variable resistor and a second variable capacitor, and the second processor being connected to the second communication circuit, wherein the first processor is configured to: set a resistance value of the first variable resistor and a capacitance value of the first variable capacitor on the basis of rotational speed information of the motor; and communicate with the second processor through the first communication circuit by using an asynchronous communication method.

To prevent generation of large electromagnetic noise due to noise enhancement effect.SOLUTION: A control device includes: a noise measurement unit configured to measure electromagnetic noise in a surrounding environment; and a control unit configured to control timing of turning on or off a switching circuit on the basis of the electromagnetic noise measured by the noise measurement unit.SELECTED DRAWING: Figure 1

A communication device includes an inter-layer interference cancellation circuit to cancel a first inter-layer interference of a first observation signal to generate a first interference cancellation signal; a first determination circuit coupled to the interlayer interference cancellation circuit for determining a first center of a first search area according to the first interference cancellation signal; a second decision circuit, coupled to the first decision circuit, for determining a first size of the first search area according to a first Gaussian interruption probability and a first signal-to-noise ratio; and a third decision circuit, coupled to the second decision circuit, for determining a first number of at least one first candidate symbol of the first interference cancellation signal according to the first size of the first search area.

This application provides an industrial electromagnetic safety simulation method and simulation sandbox. First, a digital twin of the industrial scene is acquired. Based on this digital twin, a twin scene model is constructed. The twin scene model includes multiple initial nodes and initial communication links, which are the connection paths between the initial nodes. Electromagnetic interference samples are acquired, and feature information corresponding to each initial node is obtained. The electromagnetic interference samples are injected into the twin scene model. Finally, based on each feature information and the electromagnetic interference samples, multiple target nodes are determined from the multiple initial nodes, and target communication links are determined based on the target nodes. The industrial electromagnetic safety simulation sandbox proposed in this application constructs a twin scene model containing vulnerable nodes and links through an industrial scene digital twin. Combined with the collaborative analysis of electromagnetic interference samples and node feature information, it achieves accurate mapping of high-risk communication targets from physical space to virtual space.

A refrigerator includes: a storage compartment; a motor; a door configured to open and close the storage compartment; a compressor configured to supply cold air to the storage compartment, and configured to compress a refrigerant using rotation of the motor; a first printed board assembly (PBA) including: a first communication circuit including a first low pass filter that comprises a first variable resistor and a first variable capacitor, and a first processor connected to the first communication circuit; and a second PBA including: a second communication circuit including a second low pass filter that comprises a second variable resistor and a second variable capacitor, and a second processor connected to the second communication circuit, wherein the first processor is configured to: set a resistance value of the first variable resistor and a capacitance value of the first variable capacitor.

The invention relates to a train wireless communication shielding pipeline device and system. The device comprises a plurality of signal shielding pipelines arranged in an interlayer of a carriage body. The signal shielding pipeline is used for introducing an antenna of a wireless switch and / or a network equipment terminal so as to shield interference signals; wherein the wireless switch is connected with the network equipment terminal in a wireless networking mode. The problems of external shielding and signal interference are solved, the wiring space in the train compartment is saved, the train weight is reduced, operation and maintenance deployment is convenient, and meanwhile the safety and reliability of wireless communication are improved.

This electronic device may identify radio frequency bands for wireless communication with a base station wirelessly connected via a communication circuit. The electronic device may identify first interference levels for the radio frequency bands with respect to each of candidate clock frequencies. The electronic device may set, on the basis of identifying that the number of candidate clock frequencies having the lowest interference level from among the first interference levels is one, the candidate clock frequency having the lowest interference level as a designated clock frequency. The electronic device may, on the basis of identifying that the number of candidate clock frequencies having the lowest interference level from among the first interference levels is two or more, be configured to: identify second interference levels for other radio frequency bands distinguished from the radio frequency bands; and set another candidate clock frequency having the lowest interference level from among the second interference levels as the designated clock frequency.

Interference suppression filter arrangement (1) with a busbar (3) extending through a housing (2) and having self-inductance, and with a printed circuit board (4) arranged in the housing and electrically connected to the busbar, on which at least two capacitors (46a, b) are arranged, wherein the printed circuit board has a ground connection for connection to a ground element, characterized in that the housing (2) is made of an electrically non-conductive material and has a pot-like shape with an opening (25) and comprises a ground rail (5) projecting from the opening of the housing (2) which is attached to the printed circuit board (4), wherein the interior of the housing with the components arranged therein is potted with a potting material for closing the housing opening (25) for thermal and / or mechanical decoupling of the components.

Embodiments provide a radio frequency apparatus including a radome, an absorber, and a radio frequency circuit board that may be used for millimeter wave radar of an intelligent automobile to reduce high-frequency radiation interference from a radio frequency chip and an antenna feeder.

The invention discloses a broadband communication signal extraction method of an underwater acoustic mobile platform under a strong noise background, and belongs to the field of underwater wireless communication and array signal processing thereof. The problems that under the background of underwater sound long-time broadband signals and a small-aperture array, a traditional signal extraction method is high in complexity, and it cannot be guaranteed that information is not distorted under strong interference are solved. The method comprises the following steps of: preprocessing communication signals under array elements corresponding to channels, and performing FFT (Fast Fourier Transform) on each array element signal; and sub-band division constraint is carried out, bandwidth weight vectors of the sub-bands are constructed according to the center frequencies of the sub-bands, the bandwidth weight vectors of the sub-bands are utilized to carry out weighted combination on the frequency domain signals of all the array elements, the frequency domain signals of all the sub-bands are spliced and then are converted back to the time domain through IFFT, and signal extraction is completed. The method is mainly used for underwater communication signal extraction.

Method (300) for determining a useful signal (155), wherein the method (300) comprises the following steps: - Sampling (310) of a read sensor signal (115) with a first sampling frequency (f A1 ), to obtain a first sampling signal (135) and sampling (310) of the sensor signal (115) with a second sampling frequency (f A2 ), to obtain a second sampling signal (145), wherein the first (f A1 ) and second sampling frequency (f A2 ) distinguish; and - Detect (320) the useful signal (155) as signal components (200) of the first (135) and second sampled signal (135), wherein the signal components (200) of the first (135) and second sampled signal (145) have the same frequency (228) within a tolerance range (227).

The application provides a WAPI access module drive-free access method, comprising: obtaining the transient electromagnetic pulse intensity order of the WAPI access module in the substation deployment, recording the data packet error code position distribution, obtaining the actual distance measurement result of the module and the terminal, and forming a comprehensive monitoring record; identifying the interference area division boundary according to the comprehensive monitoring record, extracting the anti-interference shielding requirement level and the anti-interference frequency band coverage range, and obtaining the area-specific interference intensity order distribution profile; identifying the influence degree of the shielding layer volume increase on the installation position far away from the communication node according to the thickness partition candidate implementation scheme, and obtaining the signal path lengthening risk assessment result; evaluating the communication delay increase and the signal attenuation degree when the signal path lengthening risk assessment result exceeds the drive-free access allowable range, and generating an adjusted shielding layer thickness partition implementation scheme.