339 results about "Frequency filtering" patented technology

The invention provides a time sequence prediction method and system based on frequency filtering and multi-view modeling, and relates to the technical field of time sequence prediction. Comprising the following steps: acquiring historical time sequence data, filtering to obtain a filtered seasonal component, and performing multi-scale division to obtain a multi-scale sequence; in each scale sequence, introducing an embedding amount, performing cyclic translation in a time dimension, generating fragments of multiple view angles, and calculating cyclic attention of the multi-scale sequence; calculating the inter-segment attention of the current scale sequence and the lag differential attention between adjacent segments to obtain the residual attention of the multi-scale sequence; and further obtaining a feature representation corresponding to each scale sequence, and aggregating the feature representations of the multi-scale sequences to obtain a multi-scale comprehensive feature representation. According to the method, effective high-frequency details are reserved while noise is removed, periodic features and local dynamic changes in time sequence fragments are extracted, and the long-term dependency relationship between different time fragments is modeled.

The invention discloses a method for adaptively identifying the thickness of a black soil layer based on a variational mode decomposition method and a ground penetrating radar technology, and the method can directly measure the thickness of the black soil layer of a large-area black land through the ground penetrating radar technology, automatically filters ground penetrating radar signal clutters, and corrects the ground position. According to the technical scheme, on the basis of a center frequency method and a residual error method, variational mode decomposition parameters suitable for black land ground penetrating radar signals are automatically obtained, then modal components of variational mode decomposition are subjected to counting analysis, a spectrogram of original ground penetrating radar signals and the actual black soil layer thickness are compared, an empirical model based on the peak area proportion is established, and the calculation accuracy is improved. The automatic screening can be used for identifying the post-screening center frequency and frequency sweep width of the thickness of the black soil layer, and the position of the black soil layer is adaptively identified after frequency filtering, so that the thickness of the black soil layer can be quickly obtained, and the identification accuracy and efficiency are improved.

The invention discloses a GIS ultrahigh frequency sensor ultrasonic cooperative detection system based on piezoelectric energization, and relates to the field of electric power detection, and the system comprises an excitation module which is used for transmitting a piezoelectric excitation signal with a specific frequency to a preset detection region in GIS equipment, so as to trigger the potential partial discharge acoustoelectric signal radiation of the region; the sensing module is used for receiving ultrahigh-frequency electromagnetic signals and ultrasonic vibration signals radiated by partial discharge in the GIS equipment; the excitation frequency, the filtering bandwidth and the sampling rate are dynamically optimized according to the detection result, the detection accuracy and efficiency are continuously improved, and reliable and effective guarantee is provided for safe operation and defect early warning of GIS equipment.

The invention discloses a broadband wearable double-frequency filtering antenna with an independent and controllable radiation zero point, and the antenna employs a double-layer dielectric substrate structure, the upper layer is a Rogers4350B substrate, the lower layer is a flexible felt substrate, and a multi-structure coupling design of a T-shaped strip, a U-shaped groove, a rectangular groove and a parasitic strip is integrated through a rectangular radiation patch. And dual-frequency work and radiation zero independent regulation and control are realized. Wherein the T-shaped strip generates a dual-frequency characteristic and a first radiation zero point between two frequency bands; the U-shaped groove regulates and controls the low-frequency zero point and broadens the low- The rectangular groove introduces a second radiation zero point between two frequency bands and expands the high-frequency bandwidth; a high-frequency zero point and a new resonance point are introduced into the parasitic strip, and the high-frequency matching bandwidth is widened. The antenna has the flexible wearable characteristic, the broadband performance and the independent controllable characteristic of the radiation zero point, and is suitable for wireless communication scenes such as WiMAX / WLAN and the like.

The invention relates to the technical field of intelligent control, in particular to a specialty paper slitting and embossing process thickness detection system, which comprises an acquisition module used for determining a plurality of dynamic reference points at a preset position at the downstream of an outlet of an embossing roller, acquiring original displacement data in real time, constructing a dynamic polygon according to the dynamic reference points, and determining the thickness of the dynamic polygon; calculating a centroid offset and an area change rate, generating a dynamic adjustment coefficient, and calibrating the displacement original data through the dynamic adjustment coefficient to obtain calibrated displacement data; the filtering module is used for performing high-frequency filtering processing on the calibration displacement data to generate filtering displacement data; and the anti-interference module is used for performing anti-electromagnetic interference processing on the filtering displacement data to generate anti-interference displacement data. According to the invention, through accurate detection, anti-interference processing and real-time control of the whole link, high-precision monitoring and regulation of the thickness of the special paper in the slitting and embossing process are realized.

The invention discloses an LLCL filter design method, and relates to the technical field of power electronics. The method comprises the following steps: acquiring an initial filter capacitance, an initial inverter side filter inductance, a power grid side filter inductance and a target frequency; calculating filtering branch inductance based on the filtering capacitance and the target frequency; calculating a positive harmonic peak frequency based on the filter capacitor, the inverter side filter inductor, the power grid side filter inductor and the filter branch inductor; calculating damping resistance, damping inductance and damping capacitance based on the positive harmonic peak frequency, the filter capacitance, the resonant frequency value constraint, the first value range constraint and the second value range constraint of the quality factor; and when the target parameter does not meet the grid-connected current harmonic standard, updating the filter capacitor and / or the inverter side filter inductance, and skipping to the step of calculating the filter branch inductance based on the filter capacitor and the target frequency so as to carry out iteration until the grid-connected current harmonic standard is met. According to the embodiment of the invention, the design optimization of the parameter value of the filter element in the LLCL filter is realized.

The invention discloses an intermediate frequency filter chip based on a gallium arsenide IPD process, which adopts the GaAs IPD process with three metal layers and comprises six resonators, twelve capacitors and three metalized grounding holes. The six resonators are composed of capacitors C1-C6 and inductors L1-L6 which are connected in series / in parallel, the inductors are all of self-built octagonal structures, and wiring is only conducted on the middle layer and the uppermost metal layer; a branch series capacitor Ca-Cc and a main parallel capacitor Cd-Cf respectively form six transmission zeros outside a low-frequency band and a high-frequency band. According to the invention, the characteristics of small size and wide band of the filter chip are realized, the loss is reduced, the in-band flatness is improved, and the filter chip has high frequency selectivity and high out-of-band rejection capability.

A system for beamforming and filtering. In some embodiments, the system includes an array of antenna elements; and a front-end circuit connected to the antenna elements, the front-end circuit including a plurality of delay elements. The delay elements may be configured to provide beam forming; and to operate as delay elements in a finite impulse response filter.

The invention discloses a signal high-frequency interference resisting device and method for electrical resistance tomography. A high-frequency filtering unit in the device comprises a magnetic ring, a coaxial shielding line, a first resistor and a second resistor; the coaxial shielding lines are connected between the corresponding detection electrodes and the signal sampling ends, and the first resistors are connected between the first ends of the signal lines in the corresponding coaxial shielding lines and the first ends of the signal lines in the next coaxial shielding lines. The second resistor is connected between the second end of the signal line in the corresponding coaxial shielding line and the second end of the signal line in the next coaxial shielding line; the first end of the signal line in the coaxial shielding line is also connected with the first end of the shielding layer in the next coaxial shielding line; the magnetic rings sleeve the outer layers of all the coaxial shielding wires and are tightly attached to the outer layers of the coaxial shielding wires, filtering on a transmission line is achieved, the twisted-pair coaxial shielding wire magnetic rings are combined to serve as transmission wire harnesses, a hardware coupling filter circuit between the wire harnesses is constructed, the suppression effect of common-mode interference is improved, sampling signals are more real, and imaging is clearer.

The invention discloses a rotary table angle data filtering method based on an adaptive cut-off frequency filter, relates to the technical field of signal data filtering, and aims to solve the problem of numerical value jumping caused by high-frequency noise interference on rotary table angle data. The method comprises the following steps: firstly, setting a minimum cut-off frequency and a speed coefficient for an adaptive cut-off frequency filter, obtaining rotary table angle data, calculating the change speed of filtered standard data, and dynamically adjusting the cut-off frequency of the filter; filtering the data for multiple times by using an exponential smoothing formula; and finally, updating the dynamic cut-off frequency according to a filtering result to obtain filter parameters. The filter is a low-pass filter, has the advantages of being easy and convenient to adjust parameters, high in adaptability and high in calculation efficiency, can effectively suppress noise, and meanwhile keeps sensitivity to fast change data. Experiments prove that the method has good performance in different speed data processing, and is suitable for an inertial navigation equipment turntable system.

The invention discloses an intelligent electric power system remote monitoring device and a monitoring method thereof, relates to the technical field of electric power monitoring interference prevention, solves the problem that comprehensive and deep feature extraction is difficult to perform on complex waveforms, and provides an intelligent electric power system remote monitoring device and a monitoring method thereof through careful analysis of signal waveform features in a monitored line. A scientific characteristic value sequence recognition system is established; aiming at the standard waveform of each monitoring item, the characteristic value sequence of the standard waveform is accurately locked, and whether the signal waveform is interfered or not can be sensitively identified by virtue of change characteristic analysis and characteristic sequence matching; according to the method, the abnormal waveform points and the interference waveforms are accurately calibrated, a proportion value judgment method is applied, misjudgment caused by parameter numerical value fluctuation is effectively avoided, the interference recognition accuracy is greatly improved, frequency filtering is directly carried out on the waveforms which do not belong to monitoring items, and the filtering efficiency is improved; for the waveforms belonging to the monitoring item, the time of different waveforms is ingeniously adjusted by determining a time difference characteristic sequence.

The invention discloses a sequence recommendation method and system based on a wavelet enhanced adaptive frequency filter, and the method comprises the steps: constructing a user behavior sequence according to the interaction between a user and an article, mapping the article in the user behavior sequence into an embedded vector, and processing the embedded vector to obtain a sequence embedded representation; the sequence is embedded and expressed, global features and fine-grained features are obtained through dynamic frequency filtering and wavelet feature enhancement, and fusion time domain features are obtained through feature integration; and processing the fused time domain feature to obtain a final time domain feature, performing probability prediction on an output vector of the last time step in the final time domain feature and transposition of an article embedding matrix to obtain a recommendation probability, and performing sorting to obtain a sequence recommendation result. According to the method, personalized global information is extracted and fuzzy non-stationary signals and short-term fluctuation are enhanced through dynamic frequency filtering and wavelet features, and performance and efficiency optimization is realized in a long-sequence recommendation scene through cooperative work of the two modules.

The invention discloses a frequency regulation optimization control method considering wind-fire storage cooperation, and belongs to the technical field of novel power system frequency regulation. Comprising the steps of establishing a wind power frequency modulation model, a thermal power and power grid frequency modulation model and a flywheel energy storage frequency modulation model; designing a frequency first-order low-pass filter, decomposing a frequency signal into a high-frequency signal and a low-frequency signal, and performing flywheel energy storage and wind power response respectively; a thermal power primary frequency modulation signal first-order filter is designed, a primary frequency modulation signal is decomposed into a high-frequency component and a low-frequency component, the high-frequency component is responded by a wind storage system in proportion and serves as compensation of respective frequency modulation instructions, and the low-frequency component is responded by a thermal power generating unit; designing a wind power frequency modulation control strategy and a flywheel energy storage charging and discharging control strategy considering the charge state; different scenes are set, and the frequency modulation effect and the thermal power fluctuation relieving performance are analyzed. Generator output fluctuation can be effectively reduced, frequency modulation pressure is shared for the thermal power generating unit, and safe and stable operation of the system is facilitated.

The invention discloses an anti-interference L-band microwave remote sensing radiometer, and the radiometer comprises a radio frequency receiving assembly which comprises a miniaturized array antenna, a single-pole three-throw switch, a band-pass filter, a low-noise amplifier, a frequency mixer, a local oscillation source, an intermediate-frequency filter, an intermediate-frequency amplifier, and a detector; a signal control and acquisition assembly; a calibration component; a data processing and transmitting component; the miniaturized array antenna is used for receiving a radio frequency noise signal in a target direction; the single-pole three-throw switch is used for respectively switching and receiving the radio frequency noise signal in the target direction, a radio frequency noise signal after heat source matching and a radio frequency noise signal after cold source matching; a radio frequency noise signal is processed through a band-pass filter, a low-noise amplifier, a frequency mixer, an intermediate-frequency filter, an intermediate-frequency amplifier and a detector in sequence, and a detection signal is combined with a calibration algorithm to complete noise temperature measurement in a target direction; the data processing and transmission assembly transmits the data to the platform. The radiometer provided by the invention has strong anti-interference capability and can be used for various scenes for retrieving environmental parameters.

The invention discloses a low-temperature filtering module and a quantum computer using the same. The low-temperature filtering module comprises a grounded shell; the filter main body is integrated in the shell, and the filter main body comprises a plurality of coaxially arranged metal cylinders to form an impedance conversion structure; the infrared wave-absorbing structure is integrated in the housing, and the infrared wave-absorbing structure wraps the filter main body. According to the invention, the low-pass filter and the infrared wave-absorbing structure are integrally designed through a coaxial discontinuous metal cylinder structure, and impedance conversion filtering and infrared quasi-particle absorption functions are realized in parallel in an integrated module, so that the high-frequency filtering performance of an original separation device is maintained, the number of devices is reduced through function integration, and the cost is reduced. The material cost and the occupied space of the mK temperature zone are remarkably reduced, the cooling capacity pressure of a refrigerator is relieved, meanwhile, the loss of a cascade connector is eliminated, the consistency of devices is improved, and a key solution is provided for space expansion and reliability optimization of a high-density superconducting bit system.

The invention relates to an audio decoding output stage circuit and audio equipment, the audio decoding output stage circuit comprises an I / V conversion module and a low-pass filtering module, and the I / V conversion module comprises a conversion circuit, a crossed diamond amplification circuit, an overcurrent protection circuit and a Roche network circuit; the conversion circuit comprises a JFET (Junction Field Effect Transistor) audio operational amplifier chip and an I / V (Input / Output) conversion resistor and is used for converting an input current into an analog voltage signal; the crossed diamond amplifying circuit can reduce the input offset voltage; the over-current protection circuit can carry out over-current protection; the rowbell network circuit can prevent high-frequency self-oscillation of the power output stage; and the low-pass filtering module comprises a filtering circuit and an ultrahigh frequency filtering circuit arranged at the output end of the audio decoding output stage circuit. The scheme can bring high-performance sound performance, and has the advantages of lower distortion, higher conversion rate, low output impedance and large pushing current.

A method of detecting an earthquake is described, comprising receiving a signal representative of measurements of three-dimensional acceleration of the device as a function of time; frequency filtering of the signal; determining, from the filtered signal, data representative of acceleration directions as a function of time; an earthquake being detected if a) the magnitude of the acceleration is greater than a first threshold and the directions of the acceleration are substantially collinear with one another for a first time interval; or b) the directions of acceleration are substantially collinear with one another during a second time interval, and the directions of acceleration are substantially collinear with one another during a third time interval subsequent to the second time interval, and the directions of acceleration of the second interval and the third interval are substantially orthogonal.

A method for designing frequency filters, includes (a) setting up a simulation model of a power supply system with frequency filters; (b) determining initial set of filter parameters; (c) calculating the model using the filter parameters in time domain; (d) extracting safety-critical trajectories from the calculated model with underlying interference functions; (e) transforming safety-critical trajectories from time domain into frequency domain; (f) determining transfer functions in s-domain by system identification; (g) extracting pairs of residuals and poles based on transfer functions in s-domain; (h) determining energy loss and voltage stability values based on the residuals and poles; (i) varying the filter parameters; (j) repeating (c)-(h) with the filter parameters varied in step (i), until a termination criterion is reached; (k) after which, selecting, from a set of points with energy loss and voltage stability values determined in step (h), a point lying on a pareto-front of the set of points.

The invention discloses a rapid direction protection method and system based on time domain parameters in a natural response stage, and belongs to the technical field of relay protection, and the method comprises the steps: collecting the three-phase voltage and current of a system line, and starting protection after detecting a system fault; obtaining fault components of the phase voltage and the phase current of the line in the time window of the natural response stage after the fault, and carrying out low-frequency filtering; performing line-mode transformation on the fault components of the filtered phase voltage and phase current to obtain 1-mode voltage and current fault components; constructing a time-frequency resistance-inductance model of 1-mode voltage and current fault components; and calculating the positive resistance sensing model conformity in the natural response stage, judging a fault type based on the positive resistance sensing model conformity, and executing a protection action according to the fault type. According to the invention, rapid and reliable fault direction discrimination and protection action are carried out by using the 1-mode fault component, the discrimination time of fault protection action response is shortened, and ultra-rapid, high-reliability and high-robustness fault direction discrimination and rapid direction protection are realized.

Method, apparatus, and non-transitory storage medium for hybrid acoustic howling suppression based on a frequency filter model and a deep neural network are provided. The method may include receiving a speech signal, the speech signal including target speech, feedback, and noise, and inputting the speech signal into a trained hybrid neural-network based howling suppression model, wherein the trained hybrid neural-network based howling suppression model is trained using training speech signal and pre-processed acoustic feedback from a first frequency filter model. The method may also include generating an enhanced speech signal with suppressed howling as an output of the trained hybrid neural-network based howling suppression model, wherein the enhanced speech signal is used to update parameters of the first frequency filter model.

The invention discloses a DMD-based high-precision light field regulation and control system and method, and belongs to the technical field of optical wavefront regulation and control. In order to suppress DMD direct current light field noise and improve light field regulation and control precision, a DMD light field regulation and control system based on high-pass filtering is designed, after the DMD light field regulation and control system is used for regulating and controlling a light field, transformation processing from a spatial domain to a frequency domain is firstly implemented, a specific filtering radius is set in a spatial frequency spectrum surface, and a specific filtering radius is set in a frequency spectrum surface; spatial low-frequency components contained in the light field are filtered out in a targeted mode, then effective removal of the direct-current light field is achieved, and finally the target of anti-scattering focusing is achieved. Compared with a traditional method, the low-frequency filtering method greatly improves the PBR, it is proved that the method can improve the contrast ratio of focal spots, and the method has obvious advantages in the aspect of anti-scattering focusing.

The application discloses a method for testing response time of a mini / micro LED direct display screen, which can avoid the influence of subjective evaluation of human visual perception on the response time, and provides a means for high-precision testing of the response time of the direct display screen through quantitative evaluation method. The method comprises the following steps: (1) a power supply inputs a stable voltage to the direct display screen, the direct display screen is lighted when a square wave driving voltage is input, light enters a microscope lens and converges on a target surface of a high-speed photoelectric detector, a response voltage signal is generated after the target surface is irradiated by the light, the voltage signal is filtered by a high-frequency filter to suppress high-frequency noise, and the voltage signal is connected to an oscilloscope through a BNC line; (2) the power supply is driven and controlled to realize different refresh rates; and step (1) is repeated to realize the response time test of the direct display screen under different refresh rates; and (3) different colors are realized by controlling a signal of the driving power supply; and step (1) is repeated to realize the response time test of the direct display screen under different colors.

The utility model discloses a multi-phase self-adaptive input-isolation double-path output power supply module. The power supply module comprises an input phase selection rectification and surge suppression unit; a high-frequency filtering unit; a high-voltage bus unit; the high-voltage bootstrap starting unit is connected to the high-voltage bus unit; the flyback conversion control unit is connected to the high-voltage bootstrap starting unit; the primary side of the isolation transformer is connected to the flyback conversion control unit; the two-way rectifying and filtering unit is connected to two secondary windings of the isolation transformer and outputs direct-current power supplies with different voltage levels respectively; and the optocoupler closed-loop feedback unit is connected between the two-way rectification filtering unit and the flyback conversion control unit and comprises a soft tap phase compensation network. The utility model has the following beneficial effects: reliable starting and stable output under the combination of AV-V wide voltage range and single-phase / three-phase arbitrary line-neutral line are realized, the standby power consumption is obviously reduced, the conversion efficiency is improved, the anti-interference capability is enhanced, and the system design is simplified.

The present invention discloses an electrically controlled conversion terahertz single-frequency, dual-frequency, and triple-frequency bandpass filter, which is composed of a high-resistance silicon layer, a polyimide layer, a common ground electrode, and a frequency control structure. The polyimide layer and the high-resistance silicon layer are superimposed, and the lower surface of the polyimide layer is in contact with the upper surface of the high-resistance silicon layer; the frequency control structure is superimposed on the upper surface of the polyimide layer, and the common ground electrode is superimposed on the lower surface of the high-resistance silicon layer. The two electrode patches of the frequency control structure are respectively connected to the positive pole of a DC regulated power supply via a switch, and the common ground electrode is directly connected to the negative pole of the DC regulated power supply. Compared with the prior art, the present invention can realize multi-frequency filtering, is suitable for different occasions, has a simple structure, and is easy to operate.

The present invention relates to an antenna RF filter assembly, and more particularly, the present invention comprises a main board on which a plurality of electric components are mounted; a plurality of RF filters provided on one surface of the main board; and a filter support member disposed between the main board and the plurality of RF filters, formed of a metal material, and spaced apart from the plurality of RF filters in the direction of the one surface of the main board, thereby providing the advantages of preventing cracks in the solder paste due to the difference in the thermal expansion coefficients of the main board and the RF filters, and achieving a more precise arrangement of the RF filters, and improving the reliability of the product.

A method, apparatus, and processor-readable medium for detecting a physical change in an environment are provided, the method comprising: acquiring a first set of sound frames representing sound waves reflected in the environment; applying frequency filtering to extract from the first set of sound frames a corresponding first set of filtered frames limited to a predefined frequency band, the predefined frequency band corresponding to a frequency band of a predefined cyclic acoustic detection signal; calculating an instantaneous amplitude of the filtered frame in the first set of filtered frames; evaluating whether the first set of sound frames is indicative of a physical change in the environment based on the calculated instantaneous amplitude and a predefined reference parameter corresponding to a reference state of the environment; when the evaluation indicates the physical change, a predefined operation is caused to be performed.

Method, apparatus, and non-transitory storage medium for hybrid acoustic howling suppression based on a frequency filter model and a deep neural network are provided. The method may include receiving a speech signal, the speech signal including target speech, feedback, and noise, and inputting the speech signal into a trained hybrid neural-network based howling suppression model, wherein the trained hybrid neural-network based howling suppression model is trained using training speech signal and pre-processed acoustic feedback from a first frequency filter model. The method may also include generating an enhanced speech signal with suppressed howling as an output of the trained hybrid neural-network based howling suppression model, wherein the enhanced speech signal is used to update parameters of the first frequency filter model.

This invention discloses a method, apparatus, device, and medium for demodulating optical tag signals, relating to the field of optical signal modulation. The method includes: acquiring a preset reference value for the intensity of the demodulated optical tag signal; performing target frequency filtering on the optical tag signal to be demodulated to obtain a filtered optical tag demodulated signal containing only the target frequency; comparing the intensity of the filtered optical tag demodulated signal containing only the target frequency with the preset reference value; and determining, based on the comparison result, whether the wavelength of the optical channel corresponding to the optical tag signal to be demodulated has deviated. This achieves low-cost, high-reliability processing of optical tag signals, effectively adapting to the low computing power characteristics of embedded microprocessors. Furthermore, it allows for rapid and accurate determination of whether the wavelength of the optical channel has deviated based on the comparison result of the demodulated signal intensity and the preset reference value, significantly improving the monitoring reliability, engineering feasibility, and application adaptability of dense wavelength division multiplexing systems based on micro-rings.

The utility model belongs to the technical field of filters, and particularly relates to a novel efficient high-frequency machine filter, which comprises an air switch, a large filter, a contactor, a high-voltage transformer, a high-voltage rectifier, a high-frequency oscillator, an ampere meter, a power transformer, a small filter, a touch screen and a programmable logic controller (PLC). Damage of high-frequency electromagnetic waves generated by a high-frequency oscillator on a power transformer, a filter, a touch screen and a PLC in the same line is reduced, current and voltage in a circuit have reverse high-frequency electromagnetic waves, the current and voltage are safely output to the PLC after secondary filtering of a large filter and a small filter, the PLC cannot be burnt down due to impact of the high-frequency electromagnetic waves generated by a high-frequency machine, and the service life of the PLC is prolonged. The PLC touch screen is free of interference and more accurate in control, and the high-frequency machine realizes automatic control of necessary components.