142 results about "Hybrid filter" patented technology

The present invention provides a high brightness color selective light modulator (CSLM) formed by a polarization modulator positioned between two retarder stacks. The modulator changes the apparent orientation of one retarder stack relative to the other so that, in a first switching state of the modulator the two retarder stacks cooperate in filtering the spectrum of input light, and in a second switching state the two retarder stacks complement each other, yielding a neutral transmission spectrum. Two or more CSLM stages can be used in series, each stage providing independent control of a primary color. One preferred embodiment eliminates internal polarizers between CSLM stages, thereby providing an additive common-path full-color display with only two neutral polarizers. Hybrid filters can be made using the CSLMs of this invention, in combination with other active or passive filters. The CSLMs of this invention can be used in many applications, particularly in the areas of recording and displaying color images. They can be arranged in a multi pixel array by pixelating the active elements, and can be implemented as color filter arrays, using patterned passive retarders rather than active polarization modulators.

A hybrid filter assembly is provided having a first ceramic triple-mode mono-block resonator, a second ceramic triple-mode mono-block resonator and at least one metallic resonator coupled to at least one of the first and second mono-block resonators. Each triple-mode mono-block resonator supports three resonant modes and each metallic resonator supports an additional mode, thereby providing a hybrid filter assembly of reduced size having more than six poles.

A hybrid filter assembly is provided having a first ceramic triple-mode mono-block resonator, a second ceramic triple-mode mono-block resonator and at least one metallic resonator coupled to at least one of the first and second mono-block resonators. Each triple-mode mono-block resonator supports three resonant modes and each metallic resonator supports an additional mode, thereby providing a hybrid filter assembly of reduced size having more than six poles.

A computer-implemented method for retrieving information from a dataset of multiple records includes the steps of receiving a search phrase from a user or client application, the search phrase having a query keyword prefix, and traversing a multilayered spatial tree using the query keyword prefix until a termination condition occurs. The multilayered spatial tree is constructed using geographic information and has a root node and a plurality of child nodes including a plurality of leaf nodes. Each leaf node is associated with a corresponding list of records. At least some of the nodes are each associated with a corresponding hybrid filter including an object filter and a child filter. The object filter directly points to one or more records, and the child filter points to one or more child nodes for a subsequent traversal step.

The invention discloses a GNSS (Global Navigation Satellite System) multi-mode multiplexer module. The GNSS multi-mode multiplexer module comprises an antenna multiplexer and a channel multiplexer, wherein the antenna multiplexer is used for receiving a downlink channel satellite signal and transmitting the downlink channel satellite signal into a four-in-one low-noise filtering combination amplifier for combination; the combined signal further comprises a Beidou first-generation uplink channel signal transmitted through a Beidou first-generation power amplifier; the combined downlink channel signal and an uplink channel transmitted signal are subjected to bidirectional equivalent shunting through a signal transmitting and receiving hybrid circuit I; and the channel multiplexer is used for performing bidirectional equivalent combination on the downlink channel signal and the uplink channel signal through the a signal transmitting and receiving hybrid circuit II, and shunting a four-path downlink channel satellite signal in a four-in-one signal power divider. A plurality of signals are shunted through a multi-mode power divider; the isolation degree between a transmitted signal and a received signal is increased through adoption of a transmitting and receiving hybrid filtering circuit pair; interference among signals is eliminated; and low-power-consumption running of a whole system is ensured through adoption of a controllable power amplifier.

An output filter for a switching audio amplifier includes a magnetic core having a gapped central leg and a first and a second outer leg. The central leg and the first outer leg form a first independent magnetic path and the central leg and the second outer leg form a second independent magnetic path. The first and the second outer leg together form a joint magnetic path. A first coil having a first plurality of turns is wound around the first outer leg. A first load current applied to the first coil generates a first magnetic flux in a first direction through the joint magnetic path. A second coil having second plurality of turns is wound around the second outer leg. A second load current applied to the second coil generates a second magnetic flux in a second direction opposite to the first direction through the joint magnetic path.

The present invention relates to an apparatus for filtering a gas or liquid stream of impurities and to filter elements used in such an apparatus. The apparatus includes a closed vessel having a longitudinally extending length, an initially open interior, an input port at one extent and an output port at an opposite extent thereof. A partition located within the vessel interior divides the vessel interior into a first stage and a second stage. At least one opening is provided in the partition. A filter element is disposed within the vessel to extend from within the first stage. The filter element is made up of a carbon block filter media surrounded by a protective porous depth filter media.

The invention discloses an integrated navigation method based on non-linear mapping self-adaptive hybrid Kalman / H infinite filters, which comprises the following steps of: establishing and describing a state equation and an observation equation of an integrated navigation system; 2, simultaneously running the Kalman filter and the H infinite filter in an integrated navigation hybrid filter; 3, obtaining the performance quantitative indicator of the Kalman filter; 4, establishing a nonlinear mapping relation between the performance quantitative indicator of the Kalman filter and the weighted parameter of the hybrid filter and adaptively adjusting weighted parameters; and 5, taking the weighted sum outputted by the Kalman filter and the H infinite filter as the whole hybrid filter as the whole hybrid filter to be outputted through the weighted parameters and finishing integrated navigation information processing. The integrated navigation method has the advantage that when the environmental noise and the system model interference are changed, higher filtering precision is obtained through automatic switching among Kalman filter state estimation, hybrid filter state estimation and H infinite filter state estimation.

The invention discloses a hybrid filtering-based depth image hole repair method. The method comprises the following steps of obtaining a to-be-repaired depth image; identifying a hole region of the image; calculating priorities of pixels in a hole; putting the pixels with the priorities higher than a threshold into a priority queue for performing filling; after the repair of the hole region is finished, repairing a non-hole region; and for the hole region and the non-hole region, repairing a non-edge region and then repairing an edge region. The priorities are set for all the pixels in the hole and depend on the support degree and credibility of neighborhood pixels to central hole pixels. With continuous filling of unknown pixels, the hole edge is continuously reduced, the priorities of the pixels of the hole edge are updated, and the threshold is adaptively updated, so that the pixel with the highest priority is ensured to be filled preferentially. Texture and structure information isadded in combination with a bilateral filtering principle, so that a relatively good processing effect is achieved for images with complex textures and structures.

The invention discloses an active tuning type hybrid filter, which is characterized in that the output of an APF (active power filter) is directly connected with two ends of a filter reactor L of a PPF (passive power filter) in parallel (or by a coupling transformer in parallel). The invention also discloses a control method of active tuning, which comprises the following steps by using the hybrid filter: connecting a branch with a linear load required to filter in parallel; obtaining each single harmonic current component to be filtered by detecting a harmonic current; comparing a condenser voltage with a reactor voltage and then carrying out PI adjustment so as to obtain the detuning degree under the condition of the frequency of harmonic to be filtered; generating the detuning degree into a harmonic compensating current weighting coefficient; forming a harmonic compensating current command; generating an active current command of fundamental waves; summing to obtain a command current of the APF; and generating a PWM (pulse-width modulation) drive signal after the command current and an actually-output current signal are subjected to PWM generation and drive. The method is remarkable, safe and reliable.

A class D amplifier is configured to accept a digital input signal wherein the control loop of the class D amplifier employs a hybrid filter merged with the front-end of a sigma-delta ADC converter. The term hybrid refers to the filter using both digital and analog components in which the digital delay elements serve as shift registers while the filter coefficients are analog. The filter converts the digital PDM data into a step-wise sinusoidal signal. The sigma-delta ADC receiving a feedback signal subtracts the step-wise sinusoidal signal from the continuous sinusoidal signal and converts the result to a digital PDM signal, without decimation, which passes through a digital filter, a PWM generator, and a pre-driver, to provide power to the load.

The present invention provides a high brightness color selective light modulator (CSLM) formed by a polarization modulator positioned between two retarder stacks. The modulator changes the apparent orientation of one retarder stack relative to the other so that, in a first switching state of the modulator the two retarder stacks cooperate in filtering the spectrum of input light, and in a second switching state the two retarder stacks complement each other, yielding a neutral transmission spectrum. Two or more CSLM stages can be used in series, each stage providing independent control of a primary color. One preferred embodiment eliminates internal polarizers between CSLM stages, thereby providing an additive common-path full-color display with only two neutral polarizers. Hybrid filters can be made using the CSLMs of this invention, in combination with other active or passive filters. The CSLMs of this invention can be used in many applications, particularly in the areas of recording and displaying color images. They can be arranged in a multi pixel array by pixelating the active elements, and can be implemented as color filter arrays, using patterned passive retarders rather than active polarization modulators.

The present invention relates to an apparatus for filtering a gas or liquid stream of impurities and to filter elements used in such an apparatus. The apparatus includes a closed vessel having a longitudinally extending length, an initially open interior, an input port at one extent and an output port at an opposite extent thereof. A partition located within the vessel interior divides the vessel interior into a first stage and a second stage. At least one opening is provided in the partition. A filter element is disposed within the vessel to extend from within the first stage. The filter element is made up of a carbon block filter media surrounded by a protective porous depth filter media.

A mixer filter that is fastened to a transmission shaft of a mixer is provided. The mixer filter includes a filter body and a blocking member. The filter body includes a base, a filter web and a top ring. The base includes a circular plate upwardly connecting the filter web along the peripheral of the circular plate. The filter web forms a hollow conical shape that has a larger upper radius and a smaller lower surface. The top surface of the filter web connects the top ring. The blocking member is formed on the top ring of the filter body. Accordingly, the juice and the fruit meat can completely be separated so as to enhance the juicing rate.

Systems and methods of the present disclosure involve passive, hybrid, and active filtering configurations to mitigate current harmonics for various electrical loads. One hybrid filtering configuration is medium voltage (MV) active filtering using a DC-DC converter and a multi-level inverter, and low voltage (LV) passive filtering. Another hybrid filtering configuration is MV passive filtering and LV active filtering using a two-level inverter. An active filtering configuration includes both MV and LV active filtering. The present disclosure also features power distribution unit (PDU) transformers electrically coupled to respective power supplies on the LV side of an electrical system. Each PDU transformer includes primary coils in a delta configuration and secondary coils in a wye configuration. The secondary coils are in series with respective leakage inductance coils. The secondary coils and the leakage inductance coils are integrated together into a single unit or module.

A hybrid FIR filter includes a plurality of FIR filter units arranged as Direct Form FIR filters, connected together in an arrangement similar to a Transpose Form FIR filter. The hybrid filter arrangement may be used to configure a larger FIR filter in a programmable logic device having one or more specialized functional blocks, incorporating multipliers and adders, that are particularly well-suited for configuration as small Direct Form FIR filters.

An apparatus and method for reducing EMI generated by a power conversion device, as well as a power conversion device employing such apparatus or method (and / or devices employing such a power conversion device) are disclosed. In at least some embodiments, the apparatus includes a hybrid filter for use in reducing EMI. The hybrid filter includes a passive filtering component, and an active filtering component coupled at least indirectly to the passive filtering component. The active filtering component includes a voltage controlled voltage source, and the hybrid filter operates to reduce a level of a common mode current, whereby the EMI generated due to the common mode current is reduced.

The invention provides an online robot kinematics calibration method based on a multi-sensor hybrid filter. The online robot kinematics calibration method comprises the following steps: 1, respectively measuring the orientation and position of an end effector of a robot by using an inertia sensor and a position sensor; 2, estimating the postures of the end of the robot by using Kalman filtering; 3, estimating the positions of the end of the robot by using particle filtering; and 4, collecting the postures of the robot by using a hybrid sensor, and calculating the differential error of the kinematic parameters by using extended Kalman filtering so as to optimize the kinematic error. According to the online robot kinematics calibration method, the robot parameters can be quickly corrected online without stopping the robot, so that the operation precision and efficiency of the robot are greatly improved.

The invention discloses a humiture automatic control type purifying combined air conditioning unit, which relates to the technical field of the purification engineering of pharmacy, electron, an animal house and the like, in particular to the technical field of purifying air conditioning units for purifying air. The humiture automatic control type purification combined air conditioning unit comprises a hybrid filter section, a surface cooling, heating and humidifying section, an air outlet section of a blower fan and a control section, wherein one side of the control section is provided with the hybrid filter section, the surface cooling, heating and humidifying section and the air outlet section of the blower fan which are interconnected with each other; and the control section is connected with the hybrid filter section, the surface cooling, heating and humidifying section respectively. The purifying humiture automatic control type combined air conditioning unit realizes the aims ofconvenient use, simple structure, high integration degree and automatic control.

The invention discloses a data mining based hybrid filtering film recommendation method. The data mining based hybrid filtering film recommendation method comprises the steps that firstly, a film attribute matrix M and a preliminary user score matrix G are established; then film key words daily browsed by a user are mined, then user clustering is performed by utilizing an ant colony method, user score which is empty in the preliminary user score matrix G is simulated, the sparsity problem of the user score matrix G is solved, and a perfect user score matrix G is obtained; a user interesting matrix H is obtained according to the perfect user score matrix G and the film attribute matrix M; finally, the user interesting matrix H is combined with the film attribute matrix M to obtain a recommended film score matrix Q. The clustering effect is improved by utilizing mined data, meanwhile the accuracy and stability of the ant colony method are improved, and the weight of a user interesting vector in the user interesting migration problem is optimized.

The invention discloses an apparatus of detecting sealing of packaged food. The apparatus of detecting sealing of packaged food includes a detection box and a water tank, wherein a support is arrangedat the upper end of each of the left and right sides of the detection box; a telescoping device is arranged at the upper side of the each support; a support plate is arranged at the upper end of thetelescoping devices; pull rods are arranged at the lower side of the support plate in a bilaterally symmetrical manner; a cover plate is arranged at the lower end of the pull rods; connecting rods arearranged at the lower side of the cover plate in a bilaterally symmetrical manner; a press plate is arranged at the lower end of the connecting rods; a plurality of water holes are formed in the press plate; the water tank includes a tank body; a quartz sand filter layer, an EPS foam filter bead filter layer, and an efficient fiber bundle and particle activated carbon hybrid filter layer are successively arranged in the tank body from left to right; a cavity is formed in the cover plate; a plurality of heating rods are arranged in the cavity; an air vent is formed in the upper side of the cavity; a vacuum pump is arranged on the air vent; and a plurality of air outlets are formed in the lower side of the cavity. The apparatus of detecting sealing of packaged food has the advantages of being simple in structure, being convenient to use, being preferable in defection effect, being high in efficiency, saving the energy, and reducing the working difficulty.

The invention discloses a blending filter for a liquid material. The blending filter comprises a filter box, wherein an extending box is arranged at the top of the filter box; a filter cavity is formed in the middle of the filter box; a rotating disk is arranged in the middle of the filter cavity; one or more stirring filter sheets are uniformly distributed outside the rotating disk; a filter meshplate is arranged in the middle of each stirring filter sheet; one or more filter mesh holes are uniformly formed in each filter mesh plate; the bottom of the filter box is provided with a liquid storage cavity; the liquid material is arranged in the liquid storage cavity; a material feeding cavity is formed in the extending box; the material feeding cavity is communicated with the filter cavity;an arc-shaped protrusion is arranged on the side, which is close to the material feeding cavity, on the inner wall of the filter cavity; part of the stirring filter sheets are in contact with the arc-shaped protrusion; and a cleaning mechanism and a liquid collection mechanism are arranged in the material feeding cavity. The blending filter for the liquid material is simple in structure, can achieve blending of materials, and has a filter function and a function of unblocking the filter mesh holes to shorten the time of cleaning the mesh plates.

The invention discloses a radar multi-target tracking PHD implementation method, and the method specifically comprises the following steps: S1, calculating the state prediction estimation of each target at the k moment based on the states of a plurality of tracking targets at the k-1 moment; S2, converting the radar measurement data at the moment k into target state likelihood data under a Cartesian coordinate system; S3, performing product hybrid filtering on the Gaussian component predicted in the step 1 and target state likelihood data; S4, calculating Gaussian components and final weightsof all targets in the radar tracking area; S5, abandoning the Gaussian components of which the final weights are smaller than a pruning threshold value, and combining the Gaussian components of whichthe distribution distances are smaller than a combination threshold value; S6, taking the weight sum of all Gaussian components as the number of tracking targets, taking the mean value of the Gaussiancomponents with the weight greater than 0.5 as the target state, and iteratively carrying out the next round of filtering until the tracking is finished; the data fusion process is simple, the anti-clutter performance is excellent, the state estimation precision of the tracking target is high, and the target number estimation is accurate.

The invention provides a hybrid filtering method for the multi-source noise of a gyroscope and a test platform. The test platform comprises a real-time simulation target machine, a triaxial rate rotary table, a triaxial gyroscope, a star sensor, a star simulator, an attitude determination module, an attitude control module and an executing mechanism. According to the hybrid filtering method for the multi-source noise of the gyroscope, the device noise of the gyroscope is suppressed through H2 optimization, and the modeling error of a filtering system is inhibited through H-infinity optimization. In combination with the H2 optimization and the H-infinity optimization, a hybrid filter is designed, so that the estimated error meets the requirement of a performance index. The hybrid filtering method designed for the multi-source noise of the gyroscope effectively improves the accuracy of the attitude determination. Based on the method, the attitude determination module of the test platform is running in real time. The test platform is directed to verify the effectiveness and the engineering practicality of the hybrid filtering method for the multi-source noise of the gyroscope, thus being applicable to the ground simulation verification in the aerospace field.

A hybrid filtering compensation device is characterized in that a grid-side signal acquisition module sends a signal detected on a current-voltage transformer CT1 on the grid side to a passive filtering compensation module, a shunt reactor L outputs inductive reactive power for compensating the capacitive reactive power generated by a filtering compensation branch; a load-side signal acquisition module sends a signal detected by a current-voltage transformer CT2 on the load side to an active filtering module; a knife switch QK is connected with a busbar between the grid side and the load side; The wire output end of the knife switch QK is connected with three fuses; the three fuses are connected with the shunt reactor L, the passive filtering compensation module, the active filtering module, and a touch screen controller; a circuit breaker QF1 is installed between a power main circuit and the wire input end of the passive filtering compensation module, and the touch screen controller is connected with the passive filtering compensation module and the active filtering module through a 485 communication bus.

The disclosure generally relates to an enhanced positioning system and method using a combination or hybrid filter. In one embodiment, Time-Of-Flight (ToF) measurements are used to determine an approximate location for a mobile device in relationship to one or more Access Points. The ToF combined with known and unknown variables are then processed through a hybrid filter system to determine location of the mobile device. The hybrid filter system may include a Kalman Filter (KF) for processing linear models and generally Gaussian noise distribution. The KF assumes that the state probability of mobile device location is Gaussian. Such variables include, for example, WiFi ToF bias. The hybrid filter system may include a Bayesian Filter (BF) for processing variables having non-Gaussian noise distribution and non-linear models. Such variables include, for example, the coordinates of the mobile device. A probability determination from each of the KF and BF is then applied to estimate the mobile device location.

An active linear regulator circuit in parallel with a filter capacitor of a switching voltage regulator injects current to a load only when the switching regulator and capacitor cannot supply adequate current to follow high frequency load transients in a manner which is compatible with adaptive voltage positioning (AVP) requirements. control of current injection and determination of the insufficiency of current from the switching regulator and capacitors is achieved by impedance matching of the linear regulator to the switching regulator. The linear regulator thus operates at relatively low current and duty cycle to limit power dissipation therein. By matching impedances and increasing the bandwidth of the switching regulator, filter capacitor requirements can be reduced to the point of being met entirely by packaging and / or on-die capacitors which may be placed close to or at the point of load to reduce parasitic inductance, as can the linear regulator.

The invention discloses a near-surface scene infrared small target detection method, which comprises the following steps of (10) infrared image preprocessing: preprocessing an infrared image by adopting a hybrid filtering algorithm; (20) background suppression: performing background suppression on the preprocessed infrared image by adopting Robinson filtering to obtain a background suppression infrared image; (30) target enhancement: calculating an integral image of the background suppression image, calculating background factor parameters, and readjusting the image by using the background factor parameters to obtain a target enhanced image; (40) obtaining the centroid of the target potential area: carrying out threshold segmentation, morphological processing and connected domain marking on the target enhanced image to obtain the centroid coordinates of the target potential area; and (50) obtaining real coordinates of the target: performing time domain association and track discrimination on the potential target to obtain the real coordinates of the target. The small target detection method is high in robustness, low in false alarm rate and high in detection precision.

The technical scheme provided by the invention includes the steps of acquiring the topology structure of a distribution network; solving a pre-established optimal configuration model by adopting a genetic algorithm based on the topology structure of the distribution network to obtain an optimal solution; and acquiring the position, type and quantity of filtering devices required to be installed based on the optimal solution. The optimal configuration model is constructed by taking the construction of the filtering device type and installation information determined by the optimal loss of the distribution network as an objective. The filtering devices include active filters, passive filters and passive and active hybrid filters according to the type. The technical scheme provided by the invention combines the genetic optimization algorithm, network harmonic power flow analysis and comprehensive optimization design of passive and active filter bank parameters, can effectively suppress harmonic waves and enables the total investment cost of the filtering devices to be low.