202 results about "Frequency filtering" patented technology

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 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.

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 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 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 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.

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.

An apparatus and a method for facilitating a first frequency filtering and a second frequency filtering together with non-reciprocal frequency conversion for electromagnetic isolation.

The invention discloses a security check stand column ferromagnetic detection system for a nuclear magnetic resonance room, which comprises a ferromagnetic detection device, a door opening detection device and an alarm device, and is characterized in that the ferromagnetic detection device and the door opening detection device are arranged close to a door of the nuclear magnetic resonance room; the door opening detection device is electrically connected with the ferromagnetic detection device; the ferromagnetic detection device comprises a magnetic field induction assembly and a signal processing assembly, the output end of the magnetic field induction assembly is electrically connected with the input end of the signal processing assembly, and the magnetic field induction assembly sends a magnetic field change signal to the signal processing assembly; the signal processing assembly comprises a band-pass filtering and amplifying unit, and the band-pass filtering and amplifying unit is used for performing amplification, high-frequency filtering and low-frequency filtering coupling processing on the magnetic field change signal to obtain a processing signal; and the alarm device is electrically connected with the signal processing assembly and is used for acquiring and identifying the processing signal and carrying out alarm work according to an identification result, so that the probability of metal leak detection or false detection is effectively reduced.

An electronic device, according to one embodiment, comprises: a main portion; a communication portion; an intermediary portion comprising a frequency filter and a diplexer; a first connection unit connecting the intermediary portion and the main portion; a second connection unit connecting the communication portion and the intermediary portion; and at least one first antenna, wherein the frequency filter is connected between the first antenna and the diplexer, and the diplexer may be connected to each of the frequency filter, the first connection unit, and the second connection unit.

The invention discloses a lightweight semantic preserving coding and decoding and voice signal reconstruction method, which comprises the following steps of: acquiring an analog audio signal from an environment, inputting an original audio signal and an audio signal subjected to high-frequency filtering to two ends of a comparator, outputting an ultralow-bit-rate binary bit stream and transmitting the ultralow-bit-rate binary bit stream to a receiving end, and after the receiving end receives the signal, outputting the ultralow-bit-rate binary bit stream to the voice signal reconstruction end. The method comprises the following steps: inputting a voice signal to an end-to-end U-Net convolutional neural network of a bottleneck layer integrated LSTM module, outputting a reconstructed voice signal, training the network by using voice coding sample reconstruction loss and multi-scale short-time Fourier transform, and performing voice signal reconstruction on an ultra-low bit rate binary bit stream of a to-be-reconstructed audio after training. The technical contradiction that in resource-limited remote audio collection and distributed sensing tasks, node hardware resources are extremely limited, and ultra-low bit rate signal compression distortion causes that node microminiaturization deployment and high voice reconstruction quality cannot be considered at the same time is solved.

A device includes a housing. a first interface on a first side of the housing, a second interface on a second side of the housing opposite the first side, and circuitry within the housing. The first interface is configured to couple to a multimode receiver (MMR) rack. The second interface is configured to couple to a MMR external to the housing. The circuitry is configured to receive, via the first interface, digital data representing navigation signals received at an antenna. The circuitry is configured to perform time, space and frequency filtering operations using the digital data to generate modified digital data. The circuitry is configured to output modified analog navigation signals, based on the modified digital data, to the MMR via the second interface.

A relay driver control system comprising: a voltage conversion unit configured to: receive and convert an AC input voltage signal to a DC voltage signal; a frequency filtering unit in electrical communication with the voltage conversion unit, the frequency filtering unit being configured to: filter out frequency components of the DC voltage signal exceeding a frequency threshold; a voltage limiting unit in electrical communication with the frequency filtering unit, the voltage limiting unit being configured to: limit the filtered DC voltage signal to voltage values not exceeding an upper voltage threshold; and a voltage monitoring unit in electrical communication with the voltage limiting unit and a relay driver, the voltage monitoring unit being configured to: generate an enabling signal based on the limited DC voltage signal; monitor the enabling signal relative to an activation threshold; and output an activation signal to the relay driver when the enabling signal meets the activation threshold.

The utility model provides a high-frequency filter heat dissipation assembly. The high-frequency filter heat dissipation assembly comprises a filter body, wherein a heat dissipation block is mounted on the front side of the filter body; a heat dissipation substrate is arranged on one side, close to the filter body, of the heat dissipation block, and the heat dissipation substrates on the two sides are tightly attached to the two sides of the filter body; a heat dissipation assembly is arranged between the heat dissipation substrate and the heat dissipation block; a mounting groove is formed in the side, away from the filter body, of the heat dissipation block, a heat dissipation fan is mounted on the inner wall of the mounting groove, and a dismounting and mounting assembly is arranged between the heat dissipation fan and the heat dissipation block. The heat dissipation substrate is tightly attached to the filter body, so that the contact thermal resistance is effectively reduced, and the heat conduction efficiency is improved; the wave-shaped radiating fins are matched with the ventilation holes, so that the radiating area and the air circulation are increased; the air guiding system composed of the air guiding groove, the flow dividing block, the flow guiding block and the air guiding plate enables airflow generated by the cooling fan to accurately and efficiently act on the cooling fins, and compared with a traditional single cooling mode, the cooling efficiency is improved.

The utility model provides a filter circuit and a filter assembly, the filter circuit is used for the filter assembly of an electric drive controller of a vehicle, the filter circuit comprises a first bus, a second bus, a plurality of groups of capacitance circuits and at least one inductance circuit, the first bus is used for accessing a first level signal; the second bus is used for accessing a second level signal; the plurality of groups of capacitor circuits are arranged at intervals along the flowing direction of the first level signal or the second level signal, and the capacitor circuits are connected between the first bus and the second bus; the capacitance circuit is used for performing high-frequency filtering processing on the first level signal and the second level signal; the inductive circuit is arranged between two groups of adjacent capacitive circuits along the flowing direction and is connected with the first bus and the second bus; the inductance circuit is used for carrying out high-frequency filtering processing on the first level signal and the second level signal. Through the mode, the filtering effect of the filtering assembly can be effectively improved, so that the working stability of the electric drive controller is effectively improved.

A generalized demodulation kernel-based evolutionary optimization single hydrophone multi-source signal separation method comprises the following steps: preprocessing a plurality of low and medium frequency non-stationary sound source mixed signals collected by a single hydrophone, generating a complex signal, and performing generalized demodulation to obtain a complex modulation signal; in a high-dimensional parameter space, an adaptive evolutionary optimization strategy is utilized to iteratively search demodulation parameters, a corresponding signal component is extracted in combination with time-frequency filtering, and a residual signal is used as a next round of separation input to carry out iterative processing, so that high-precision separation and reconstruction of multi-source signals are realized. Under the condition of no target time-frequency priori knowledge, parameter optimization is carried out through a differential evolution algorithm, and time-domain waveforms of different underwater sound sources are obtained through separation.

The invention belongs to the technical field of filter capacitor detection, and provides a fault detection method and system for a filter capacitor, and the method comprises the steps: determining a current abnormal frequency band corresponding to a high and low frequency filtering combination of different low frequency equivalent series inductors; determining a frequency-ripple current coupling relation of high and low frequency filtering combinations of different low-frequency equivalent series inductors in a current abnormal frequency band; judging whether a ripple current fault occurs or not, if so, judging whether filter capacitor fault depth tracking is needed or not through low-frequency equivalent series inductance change of a current high-low frequency filter combination and comparison of a current frequency band and a current abnormal frequency band, and if so, judging whether the filter capacitor fault depth tracking is needed through the frequency band and the ripple current in a ripple current fault time period. And matching verification of a frequency-ripple current coupling relationship is carried out to determine whether the ripple current fault of the high-frequency filter capacitor is caused by one-way fault transfer between the high-frequency filter combination and the low-frequency filter combination, so that the fault diagnosis accuracy of the filter capacitor is improved.

Specific vibrations generated by processing equipment are detected early.An information processing device (10) comprises: a maintainer (12) that receives vibration data indicating a vibration generated during a machining operation performed by the machining equipment; an analyzer (13) that analyzes the vibration data received by the maintainer (12) to identify one or more specific frequencies that are one or more frequencies of specific vibrations contained in the vibration specified in the vibration data; a filter (14) that extracts a vibration component containing the one or more specific frequencies contained in the vibration specified in the vibration data received by the maintainer and calculates an amplitude of the extracted vibration component; and a display (15) that displays the amplitude calculated by the filter (14).

The utility model discloses a novel terahertz wave detection module, and relates to the technical field of terahertz wave detection. The detection module comprises a terahertz input waveguide and a quartz substrate, a terahertz waveguide conversion probe on the quartz substrate stretches across the terahertz input waveguide, and the outer side end of the terahertz waveguide conversion probe extends to the left end of the quartz substrate. The end part of the inner side of the terahertz waveguide conversion probe is connected with one end of a terahertz detection Schottky diode through a terahertz detection Schottky diode matching network, and the other end of the terahertz detection Schottky diode is connected with one end of an intermediate frequency filter through an intermediate frequency filter matching network; the other end of the intermediate-frequency filter is connected with the output end of the direct-current bias module and the input end of the intermediate-frequency interface, one end of a beam lead is connected with the terahertz detection Schottky diode matching network through a microstrip line, and the other end of the beam lead extends to the outer side of the quartz substrate and is used for being connected with a cavity. And grounding is realized. The detection module has the advantages of wide detection range, high sensitivity and the like.

The invention discloses a high-precision denoising method suitable for gravity data of a metal mine area, which belongs to the technical field of gravity data denoising, and comprises the following steps: (1) data preparation and initial preprocessing; (2) quickly focusing, inverting and extracting a geologic structure template; (3) forward modeling calculation and signal extraction; (4) noise field estimation and feature analysis; (5) constructing an adaptive filter; and (6) applying filtering and iteration to terminate judgment. According to the method, the inherent limitation of an existing frequency filtering method in the aspect of distinguishing mine-induced anomalies and noise is effectively solved, the dependence on artificial experience is remarkably reduced, the objectivity of filtering parameter selection is improved, a reliable scheme is provided for high-precision denoising of metal mine area gravity data, and the method is suitable for popularization and application. And effective support is provided for accurate detection and positioning of the weak concealed ore body.

A method (1) for operating an ultrasonic flow meter (2) for measuring the flow rate through a measuring tube (4) through which a medium (3) flows is presented and described, wherein the ultrasonic flow meter (2) comprises at least one transmitting ultrasonic transducer (5) for transmitting ultrasonic signals (6) and at least one receiving ultrasonic transducer (7) for receiving ultrasonic signals (6) and a control and evaluation unit (8), wherein the ultrasonic transducers (5, 7) are arranged such that they realize an ultrasonic measurement path (9) in the medium (3) and wherein the control and evaluation unit (8) controls the transmitting ultrasonic transducer (5) such that it emits the ultrasonic signal (6).The receiving ultrasonic transducer (7) receives the emitted ultrasonic signal (6), and the control and evaluation unit (8) determines, during measurement operation (14), at least an indirect value for the flow rate (Vp) of the medium (3) through the measuring tube (4) from a determined signal transit time (t_sig) of the ultrasonic signal (6) by evaluating the emitted and received ultrasonic signals (6). The method can react flexibly to changing measurement conditions by the control and evaluation unit (8) controlling the transmitting ultrasonic transducer (5) so that a broadband ultrasonic signal (USb,tx) is emitted, by determining an optimal measurement frequency range (M_opt) in an evaluation step (10), by frequency-filtering (11) the received broadband ultrasonic signal (USb,rx) into several measurement frequency ranges (M) of the received broadband ultrasonic signal (USb,rx), by furthermore calculating (12) at least one quality value (Q) from the frequency-filtered ultrasonic signal (USb,rx,f) of the corresponding measurement frequency range (M) for each of the measurement frequency ranges (M) and determining the measurement frequency range (M) that achieves the highest quality value (Q) as the optimal measurement frequency range (M_opt), and by using a signal propagation time (t_sig) when determining the at least indirect value for the flow rate (Vp).which was determined after frequency filtering (11) of the received broadband ultrasound signal (USb,rx) from the optimal measurement frequency range (M_opt).

The invention discloses an impedance extraction device and method under magnetic core saturation excitation, and relates to the technical field of electromagnetic compatibility. The device comprises an injection device and an extraction device. The injection device comprises a power amplification circuit, an AC-DC power supply, a signal generator, an MCU control circuit and a current detection circuit, and the extraction device comprises a high-frequency filter circuit, a feed-through capacitor, a first radio frequency current probe, a second radio frequency current probe, a magnetic core clamp, a first high-pass filter, a second radio frequency current probe and a vector network analyzer output end. According to the method, controllable current is applied to the magnetic core through the injection device to enable the magnetic core to be saturated, and meanwhile, the impedance of the magnetic core in a saturated state is extracted on line by utilizing a vector network analyzer and a double-probe method in the extraction device in combination with SOL calibration and a specific impedance calculation formula. According to the method, the impedance of the magnetic core under different saturation degrees can be obtained, the test process is simple, and the sensitivity and operability are high.