58 results about "Complex filter" patented technology

An acoustic wave device includes a silicon single crystal baseplate including a main surface, a piezoelectric layer directly or indirectly on the main surface of the silicon single crystal baseplate, and an IDT electrode on the piezoelectric layer and including electrode fingers. The piezoelectric layer is a lithium niobate layer. In the main surface of the silicon single crystal baseplate, a plane orientation is (111). When Euler angles in the main surface of the silicon single crystal baseplate are (φ, θ, ψ), the ψ in the Euler angles of the silicon single crystal baseplate is about −30 degrees <ψ< about 30 degrees.

The invention relates to the technical field of high-voltage commutation, and discloses a control method and system for a composite LC filter of a high-voltage converter station, and a storage medium. According to the method, on the basis of staggered solid / liquid-filled dielectric plates and series hollow inductors in a sealed oil tank, by obtaining a capacitance / inductance adjusting instruction, the filling and pumping volume and speed of insulating liquid and magnetic liquid are controlled according to the absolute value of an adjusting value, and continuous and accurate adjustment of the filtering frequency and reactive power is achieved. The method comprises multiple optimization: monitoring high fluctuation of liquid, synchronously filling, pumping and radiating, balancing efficiency and energy consumption according to an adjusting frequency adaptive circulation speed, and performing reverse linkage cooperative adjustment on a dielectric medium pump and a magnetic liquid pump; and magnetic liquid leakage and insulation abnormity are treated in stages, so that operation is guaranteed. The method solves a traditional adjustment dead zone, does not need a power electronic device, is low in cost, is small in loss, is adaptive to outdoors, and improves the electric energy quality and equipment safety of a converter station.

The invention relates to the technical field of electronic circuits, in particular to a filter circuit, a voltage filter control circuit, a chip and electronic equipment. The filter circuit comprises a counter, a first data selector, a digital operation circuit and a register, the counter is used for receiving the counting enable signal, outputting a counting mark value to the first data selector, determining a corresponding current logic operation mode according to the current counting mark value, and performing logic operation on the intermediate input parameter according to the current logic operation mode to obtain a first voltage error value after filtering processing; by adopting the filter circuit provided by the invention, required logical operation can be completed by virtue of the first data selector and the digital operation circuit, so that the first voltage error value is output, and the filtered voltage signal is adjusted according to the first voltage error value, so that the set frequency component in the output voltage signal is filtered out; in this way, complex filter coefficients do not need to be configured, a processor with higher computing power does not need to be used, and hardware cost is saved.

The invention relates to a virtual inertia-damping cooperative adaptive control method for a voltage source type direct-driven permanent magnet wind turbine generator. The method comprises the following steps: constructing a voltage source type direct-driven permanent magnet wind turbine grid-connected equivalent model; constructing a wind turbine generator frequency response model based on a dynamic coupling relationship between virtual inertia and virtual damping; collecting a frequency signal of a common connection point of a power grid, and carrying out collaborative optimization processing on the frequency signal by adopting a composite filter to obtain a virtual power increment; the active power reference value is introduced into an active power control loop of the grid-side converter; and controlling the power grid side converter after the additional power reference value is introduced by adopting a rotational inertia and damping coefficient adaptive control method based on a nonlinear function. According to the method, frequency steady-state deviation compensation and dynamic change rate correction can be realized, the frequency stability under wide-range disturbance can be improved through segmented nonlinear adjustment, and the requirements of unit active inertia response and power grid frequency stability are met.

The invention relates to the technical field of defect detection, in particular to a corrugated paper defect detection method and system based on machine vision. The method comprises the following steps: acquiring a corrugated paper image and converting the corrugated paper image into a frequency domain; identifying a periodic texture peak point based on amplitude spectrum angle energy distribution, generating a texture suppression filter, and combining with a multi-scale Gaussian high-pass filter to obtain a composite filter bank; the filter bank is used for filtering the frequency domain signals and performing energy weighted fusion; performing inverse transformation on the fused signal to obtain an enhanced image; and segmenting the enhanced image to obtain candidate defects, and verifying by combining the gradient information of the original image to determine a final defect. According to the scheme, the texture background can be adaptively inhibited, the multi-scale defect is enhanced, the false alarm rate is effectively reduced in combination with gradient check, and the detection accuracy and robustness are improved.

The present invention provides a transceiver circuit, which includes a receiving circuit and a digital circuit, and the receiving circuit includes a first mixer, a second mixer, a bias voltage circuit, a complex filter and an ADC. In the operation of the transceiver circuit, the digital circuit controls the bias voltage circuit to sequentially switch the first bias voltage to a plurality of first bias values, and the receiving circuit generates a plurality of first digital signals respectively corresponding to the plurality of first bias values, wherein the plurality of first digital signals are used to calculate a plurality of first quality parameters respectively corresponding to the first bias values. The digital circuit controls the bias voltage circuit so that the first bias voltage has the first bias value corresponding to an optimal quality parameter, wherein the optimal quality parameter is determined according to the plurality of first quality parameters.

The invention discloses a hybrid echo cancellation method and system based on depth filtering and frequency band weighted loss, and the method comprises the steps: carrying out the preprocessing of a microphone signal and a reference signal through a low-complexity linear echo cancellation preprocessing module, and outputting an error signal; the three paths of input are sent to a hybrid conditional filter network (HHF-Net); complex domain time-frequency features are extracted through an encoder, and a complex time-frequency spectrum is recovered through a decoder after bottleneck layer modeling; a depth filtering module learns a complex filter coefficient for each time frequency unit, and suppresses echo through causal two-dimensional convolution; a mixed loss function training model of frequency band weighted amplitude loss and scale invariant signal-to-noise ratio (SI-SNR) loss is adopted. The problems of target voice information loss, poor output voice listening feeling and overlarge model parameter quantity in a double-talk scene are solved, an average opinion score (MOS) index is remarkably improved, and echo components are effectively inhibited while voice distortion is reduced.

The embodiment of the application provides a direct current offset correction method and a correction system, the method comprising: obtaining a first direct current output offset voltage of a complex filter to be corrected; determining a relationship between a direct current input voltage and the direct current output offset voltage under an ideal filter based on a preset virtual ground characteristic of an operational amplifier, according to an input current of an input point of the operational amplifier and a preset resistance of the complex filter; determining a to-be-corrected current according to the relationship between the direct current input voltage and the direct current output offset voltage under the ideal filter and the first direct current output offset voltage, and working under a normal working condition by using the to-be-corrected current; and based on the preset virtual ground characteristic of the operational amplifier, performing one or more iteration calculations on the input current of the input point of the operational amplifier, the preset resistance of the complex filter and the to-be-corrected current, so that a second direct current offset voltage is a preset value, the IQ structure of the complex filter is not damaged, and the I / Q two paths can be simultaneously corrected, and one-step correction is completed.

The application discloses a kind of membrane preparation waste liquid recovery processing equipment, it is related to membrane preparation wastewater treatment technology, including processing box body, and the liquid discharge notch being opened in the right side upper portion of processing box body;Further include: the left side upper portion of processing box body is provided with initial filter component, and initial filter component contains initial filter box body, and the liquid outlet notch being opened in the right side upper portion of initial filter box body is correspondingly distributed in the left side upper portion of processing box body;Wherein, the right side outer wall of initial filter box body is rotatably provided with follow-up guide pulley by bearing, and follow-up guide pulley is arranged below liquid outlet notch;The inside of processing box body is provided with impurity removal component, and impurity removal component contains filter screen plate.This membrane preparation waste liquid recovery processing equipment, by initial filter box body to waste liquid precipitation, and discharge to processing box body inside carries out filtration treatment, and push the sundries in waste liquid to processing box body outside, avoid causing blockage at the same time, complex filter component carries out depth filtration, and then realize the recovery processing of membrane preparation waste liquid.

Provided is a composite filter device capable of increasing the out-of-band attenuation of a band-pass filter. This composite filter device is provided with: a piezoelectric substrate (2); a first filter as a band-pass filter, the first filter including a longitudinally coupled resonator-type elastic wave filter (6) formed on the piezoelectric substrate (2); a second filter including at least one resonator and an inductor (L4) connected to a reference potential; and a reference potential wiring (9) which is provided on the piezoelectric substrate (2), is connected to a reference potential, has a substantially annular portion (9a) having an annular shape via a gap, and surrounds the longitudinally coupled resonator-type elastic wave filter (6) in the substantially annular portion (9a). The substantially annular portion (9a) of the reference potential wiring (9) has a first end portion (9b) and a second end portion (9c) that face each other with a gap therebetween, and a reference potential connection portion (9d) that extends from the first end portion (9b) and connects the longitudinally coupled resonator-type elastic wave filter (6) to a reference potential. The inductor (L4) includes one parallel wiring section (La) extending parallel to the reference potential connection section (9d) in plan view, or two or more parallel wiring sections (La) extending parallel to the reference potential connection section (9d) in plan view, arranged in a direction orthogonal to the direction in which the reference potential connection section (9d) extends, and having the same current flow direction. When a region including a parallel wiring portion (La) located closest to one side in a direction orthogonal to a direction in which the parallel wiring portions (La) extend to a parallel wiring portion (La) located closest to the other side in the direction is defined as a parallel wiring portion region (L), the parallel wiring portion region (L) and the reference potential connection portion (9d) overlap each other in a plan view. The direction (arrow B) of the current flowing through the parallel wiring section (La) and the direction (arrow A) of the current flowing through the reference potential connection section (9d) are the same.

The application relates to the technical field of semiconductor manufacturing, and discloses a wafer defect detection method, a wafer defect detection device and a medium. The method comprises the following steps: performing image processing on a target wafer image of a wafer object to be detected to obtain a plurality of local spectrum regions; performing complex filtering processing on the local spectrum regions in a plurality of scales and a plurality of directions to obtain response information of each local spectrum region under different scales and different directions; determining a phase consistency residual graph, a frequency band leakage residual graph and a direction offset residual graph based on phase responses and energy responses in the response information, a pre-constructed spectrum phase reference field, a main frequency band and a main direction; performing multi-scale residual back projection processing on the target wafer image to obtain a multi-scale residual back projection graph; generating a defect saliency graph based on any one or several of the phase consistency residual graph, the frequency band leakage residual graph, the direction offset residual graph and the multi-scale residual back projection graph; and performing defect detection based on the defect saliency graph to obtain a target detection result.

The invention relates to the technical field of water sample filtering devices, and discloses a portable water sample sediment screening and filtering device and a using method.The device comprises a screening filter, a water inlet is formed in the upper portion of the screening filter, a first thread is arranged in the water inlet and used for being connected with an external water bucket, and a water outlet is formed in the lower portion of the screening filter; a second thread is arranged on the outer surface of the water outlet; a cavity is formed in the screening filter, and a plurality of layers of filter plates or filter screens are arranged in the cavity; an air inlet is formed in the upper side of the screening filter and can be externally connected with an air pump. By arranging the silt screening filter and the filtering barrel which are detachably connected, a filtered water body is placed on the upper portion, solid-liquid separation and glue-liquid separation are achieved through screening of different particle sizes and pressurization flow increasing, meanwhile, the device provides multiple use choices, natural water body sampling, primary filtering and fine filtering are completed in a one-stop mode, and the device is high in practicability and high in practicability. Meanwhile, the problems of complex assembly, complex filter membrane replacement and unstable pressure control can be solved, and the device is suitable for daily, field or emergency scenes.

The present application belongs to the technical field of intelligent state evaluation of generator set operation, and discloses a natural gas generator set operation intelligent state evaluation method and system, which comprises the following steps: obtaining multi-physical field operation data, reconstructing the multi-physical field operation data based on different time scales to obtain a physical perception state point cloud set; performing complex filtering on each time scale point cloud, and performing multi-scale unit operation state topology evolution analysis on the filtered complex sequence; inputting the topology feature vectors into a topology random forest model for training, and performing joint reasoning to output a fault mode posterior distribution; calculating a unit health index, and combining the unit health index with a dynamic early warning threshold to realize natural gas generator set operation state evaluation. The present application can deeply mine the dynamic evolution law of different physical processes such as combustion, machinery, heat and degradation, and effectively capture early weak faults and multi-field coupling abnormalities that are difficult to identify by traditional methods.

The invention belongs to the technical field of power system synchronization, and particularly relates to a three-phase phase-locked loop control method and device. The method comprises the following steps: acquiring a q-axis power grid voltage sampling value of a three-phase power grid voltage sampling value under a two-phase rotating coordinate system; inputting the q-axis power grid voltage sampling value into a complex coefficient filtering sliding mode observer, extracting alternating current frequency multiplication disturbance brought by the distorted power grid voltage, and obtaining a q-axis voltage estimated value, a direct current estimated value in the alternating current frequency multiplication disturbance and a total alternating current estimated value in the alternating current frequency multiplication disturbance; the complex coefficient filtering sliding-mode observer is obtained by connecting a complex number filtering item of a complex coefficient filter in parallel in the sliding-mode observer; and calculating a phase angle estimation value of the three-phase phase-locked loop after feedback compensation based on the q-axis voltage estimation value, the direct current quantity estimation value in the alternating current frequency multiplication disturbance, the total alternating current quantity estimation value in the alternating current frequency multiplication disturbance and the power grid phase voltage amplitude. The control efficiency and accuracy of the phase-locked loop are improved, and the method has good stability and robustness.

The utility model relates to sewage treatment technical field, concretely is a kind of sedimentation tank with anti-blocking function, it includes pool body and central tube, the position of central tube near bottom is equipped with aeration unit, the aeration unit includes aeration assembly and aeration pipe, aeration pipe is arranged between aeration assembly and central tube, and the aeration gas stream released when aeration assembly periodic operation enters central tube to carry out water flow disturbance by aeration pipe;That is, the disturbance water flow formed by aeration gas stream in central tube solves the problem of central tube blockage, without manual cleaning, without setting complex filter device, in addition, the aeration unit of the scheme only as auxiliary flushing unit periodic operation, therefore, the influence to the sedimentation environment of sedimentation tank is less;Visible, the sedimentation tank of the structure of the scheme has the advantages such as high operating efficiency and long service life, and maintenance cost is also reduced and operation process is simplified, has wide application prospect and economic benefits.

The utility model relates to a water quality purification circulating device for aquaculture, which belongs to the technical field of water quality purification and comprises a filter tank and a re-filter tank, a filter purification mechanism is arranged between the filter tank and the re-filter tank and comprises a support rod fixedly mounted at the top of the filter tank, and a filter screen is fixedly mounted on the surface of the support rod. And a grid supporting plate is fixedly mounted in the filter box. According to the water quality purification circulating device for aquaculture, a filter screen and a filter cotton pad are arranged on the filter box, large impurities in water can be intercepted and filtered, and meanwhile, the filter screen is installed through a hook and a connecting ring, so that the filter screen is convenient to maintain; a graphene filter element and a ceramic filter element are arranged in the filter box and can adsorb fine impurities and other organic pollutants in water, and an activated carbon layer and a quartz sand layer can be used for carrying out secondary adsorption filtration on the water, so that the filtering and purifying effects on the water are greatly improved.

The embodiment of the present application provides an anti-interference method and system, a household appliance and a storage medium. The anti-interference method comprises the following steps: starting timing from a current time; when the timing time reaches a preset time, acquiring working data of a processing module, wherein the preset time is equal to or shorter than a communication interval length between the processing module and an associated module or a starting length consumed by the processing module for starting the associated module; judging whether the working data is normal; and resetting the working data if the working data is not normal. Compared with the existing anti-interference technology using a complex filter device, the anti-interference scheme relies on a software algorithm, and thus is simple to realize, easy to modify and low in cost.

The application discloses a transmissive array antenna with high selective gain filtering characteristics, which comprises a planar transmissive array as a transmissive surface and a horn antenna as a feed source; a 180-degree transmissive phase difference is realized by rotating a feed part of a magnetic electric dipole of the planar transmissive array by 0 degree or 180 degrees around a central axis; the planar transmissive array comprises a plurality of periodically and seamlessly distributed transmissive units, each of which generates a different compensation phase when subjected to a y-polarized incident wave, so as to form a required beam direction; the method is based on a magnetic electric dipole antenna loaded with split ring resonators, can realize higher selectivity under a planar structure, avoids the design of a complex filter part and a higher profile of a three-dimensional structure in an antenna-filter-antenna structure, can be widely applied to long-distance communication, and can more fully utilize limited electromagnetic spectrum.

The application discloses a phase-locked loop based on a pre-filter and belongs to the field of grid voltage synchronous signal extraction. The application solves the problem of poor phase-locked precision caused by high harmonic content of grid voltage, and improves the ability of the phase-locked loop to track grid voltage synchronous information. The application introduces an improved complex filter (ICCF) before the Clarke transformation, thereby eliminating the harmonic components in the input three-phase grid voltage from flowing into the phase-locked loop control loop at the source, and adding a phase compensation module to offset the phase offset introduced by the improved complex filter (ICCF). The application is mainly used for extracting three-phase grid voltage synchronous signals in a grid-connected inverter.

A transceiver circuit and a control method thereof are disclosed. The transceiver circuit includes a receiving circuit and a digital circuit. The receiving circuit includes a first mixer, a second mixer, a bias circuit, a complex filter, and an analog-to-digital converter. In operation of the transceiver circuit, the digital circuit controls the bias circuit to sequentially switch a first bias to a plurality of first bias values, and the receiving circuit generates a plurality of first digital signals corresponding to the plurality of first bias values, respectively, and calculates a plurality of first quality parameters corresponding to the plurality of first bias values, respectively; and the digital circuit controls the bias circuit to make the first bias have a bias value corresponding to a best quality parameter, wherein the best quality parameter is determined by at least the plurality of first quality parameters.

The invention discloses an inverted pendulum control method, device and system based on EKF and LPF compounding, a sensor collects swing rod angle information and trolley position information, the data are transmitted to a low-pass filter (LPF) for processing, the processed data are embedded into extended Kalman filter (EKF) for iterative optimization processing, and the data are closer to reality; the core controller calculates the state according to the feedback gain and the data processed by the composite filter, outputs the voltage of the direct current motor, and controls the inverted pendulum system. In the process, the core controller carries out iterative optimization estimation on state input variables of collected data through EKF and LPF composite filtering, interference of random noise and high-frequency vibration noise of the inverted pendulum system on the state data of the inverted pendulum system is weakened, and the control effect of the controller is guaranteed. According to the invention, the problems of instability, loud noise and the like of input data are solved, so that the advantages and disadvantages of different control strategies are researched.

Systems and methods for joint stereo coding. A method for stereo audio signal encoding includes passing a left channel and a right channel of a stereo audio signal to a complex valued filter bank analysis section and calculating an energy of the left channel, an energy of the right channel, and a covariance of the left channel and the right channel. The method includes selecting a stereo encoding mode for encoding a left channel and a right channel. The method comprises: calculating a phase difference between a left channel and a right channel, adjusting phase alignment between the left channel and the right channel based on the phase difference, converting the aligned left channel and the aligned right channel into an intermediate signal and a side signal, and generating a residual signal based on side prediction data and the side signal; and encoding the intermediate signal, the residual signal, the phase difference, and the side prediction data in a bit stream, and transmitting the bit stream.

This invention belongs to the field of intelligent status assessment technology for generator sets, and discloses a method and system for intelligent status assessment of natural gas generator sets. The method includes: acquiring multi-physics field operation data; reconstructing the phase space of the multi-physics field operation data based on different time scales to obtain a set of physically perceived state point clouds; performing complex filtering on the point clouds at each time scale, and conducting multi-scale topological evolution analysis of the filtered complex sequences; inputting the topological feature vectors into a topological random forest model for training, and performing joint inference to output the posterior distribution of fault modes; calculating a generator set health index, and combining the generator set health index with a dynamic early warning threshold to achieve the assessment of the operating status of the natural gas generator set. This invention can deeply explore the dynamic evolution laws of different physical processes such as combustion, mechanical, thermal, and degradation, and effectively capture early weak faults and multi-field coupling anomalies that are difficult to identify using traditional methods.

In a composite filter, first to third filters are connected to any ports of a first hybrid including a 90° hybrid coupler. The first filter has a first passband. The second filter and the third filter have a second passband that does not overlap the first passband. An electrical section from the first filter to the first hybrid is referred to as a first part. A combination of an electrical section from the second filter to the first hybrid and an electrical section from the third filter to the first hybrid is referred to as a second part. At least one of the first part or the second part does not include a matching network containing an inductor including a conductor of a multilayer substrate.

A transceiver includes a receiving circuit, which includes a first mixer, a second mixer, a complex filter, a switch module, and an analog-to-digital converter. In operation of the transceiver, the first mixer mixes an input signal to generate a first mixed signal, the second mixer mixes the input signal to generate a second mixed signal, the complex filter generates a first intermediate frequency signal and a second intermediate frequency signal based on the first mixed signal and the second mixed signal, the switch module selects one of the first intermediate frequency signal and the second intermediate frequency signal based on a control signal to generate an output intermediate frequency signal, and the analog-to-digital converter performs an analog-to-digital conversion operation on the output intermediate frequency signal to generate a digital signal.

The present invention provides a transceiver circuit including receiver circuit, wherein the receiver circuit includes a first mixer, a second mixer, a complex filter, a switch module and an ADC. The first mixer is configured to mix an input signal with a first oscillation signal to generate a first mixed signal. The second mixer is configured to mix the input signal with a second oscillation signal to generate a second mixed signal. The complex filter is configured to generate a first intermediate frequency signal and a second intermediate frequency signal according to the first mixed signal and the second mixed signal. The switch module is configured to select one of the first intermediate frequency signal and the second intermediate frequency signal to serve as an output intermediate frequency signal. The ADC is configured to perform an analog-to-digital conversion operation on the output intermediate frequency signal to generate a digital signal.

A technique for creating a GraphQL Application Programing Interface (API) schema is disclosed. The technique includes generating a filter input object for an object defined in a GraphQL API schema. The filter input object provides the ability for a GraphQL API user (i.e., an API developer or an end user) to perform filtering operations in a query operation on schema objects defined in a GraphQL API schema. The filter input object comprises a set of object attributes and a set of custom attributes. The custom attributes provide the ability for an API developer (or an end user) to perform complex filtering operations in a query operation on schema objects defined in a GraphQL API schema. The technique further includes receiving a query operation to be performed and executing the query operation against a backend datasource to obtain a query result. The query result is transmitted to a GraphQL API user.

The application provides a time slot displacement calculation method based on momentum intersection relaxation constraint, steps S1, selecting the motion position points of a positioned carrier in two continuous time slots, and marking the first position point as ST1 and the second position point as ST2; step S2, for the target time slot position point ST k of the positioned carrier, constructing a gradient description model based on the motion continuity of the first position point ST1 and the second position point ST2, and estimating a virtual common point ST k '; step S3, based on the sphere intersection principle, converting the non-common point positioning problem of the positioned carrier into a common point solving problem; step S4, constructing an optimization problem of a relaxation constraint model, realizing the quantitative calculation of the time slot displacement, extracting the motion characteristics by selecting the motion position points of the continuous time slots to accurately estimate the virtual common point, eliminating the positioning equation no solution or conjugate solution problem caused by the motion of the positioned carrier, reducing the positioning error, and meanwhile, by introducing the relaxation constraint model, the calculation redundancy caused by the complex filtering algorithm can be avoided, and the calculation complexity is reduced.

This invention discloses an automatic detection and classification method and system for micro-defects in OLED displays, relating to the field of display panel quality inspection technology. The method includes acquiring OLED display images and preprocessing them; modeling pixel responses based on the preprocessed images and generating an ideal background image; performing differential processing and multi-scale residual feature enhancement to obtain an enhanced residual image; segmenting the enhanced residual image to extract a set of candidate defect regions and extracting global features; based on the set of candidate defect regions, performing frequency domain enhancement on the global features using a local frequency domain prior-guided complex filter to obtain enhanced global context features; based on the enhanced global context features, using a meta-learning mechanism to obtain new screen type adaptation parameters for defect category probability prediction; and performing uncertainty estimation based on the defect category probability prediction results. This invention enables more accurate, flexible, and reliable OLED display defect detection and classification.