115 results about "Distributed filtering" patented technology

A housing for a distributed filter removably mounts to a wall plate between the wall plate and a wall-mount telephone without the use of a tool. The housing includes a base and a cover attached to the base that together define a cavity. A filter circuit for filtering voice signals is disposed within the cavity. A phone jack and at least one auxiliary jack are also disposed in the cavity and accessible through the cover. In one embodiment, viewing windows are formed through the cover to permit an installer to view the mounting studs on the wall plate during installation. A slide lock is also provided to secure the housing to the wall plate. In another embodiment, a push-button lock is provided to secure the housing to the wall plate. The push-button is forced outwardly during installation when a mounting stud engages a slot formed in the base and is subsequently depressed to secure the housing to the wall plate.

A multispectral sensor is provided with an illumination source and a digital imaging system. The illumination source is disposed to provide light at multiple wavelengths to an object. The digital imaging system is disposed to receive light scattered from the object and has a digital array of light detectors and a color filter array. The color filter array has a multiple distributed filter elements, each of which is adapted to transmit light of one of a limited number of specified narrowband wavelength ranges. The color filter array is disposed to filter the light scattered from the object prior to encountering the digital array of light detectors.

The invention discloses a method for detecting a fissure on the surface of a subway tunnel. The method for detecting the fissure on the surface of the subway tunnel comprises the steps that high-speed image acquisition is conducted on the surface of a subway tunnel body by means of a visual system formed by high-speed area-array cameras; an acquired image is preprocessed to enable a binary image to be obtained; the communication area of the binary image is calculated, multi-level filtering processing is conducted based on the communication area, and a tunnel surface image with irregular noise points which are irregularly distributed filtered out is obtained; detection of the fissure on the surface of the tunnel is conducted according to the tunnel surface image with the irregular noise points which are irregularly distributed filtered out, and the size of the fissure is calculated after the fissure is detected. By the adoption of the method for detecting the fissure on the surface of the subway tunnel, a complicated noise background can be eliminated effectively, and the fissure detection accuracy is improved.

The invention belongs to the technical field of distributed filtering and target tracking, and particularly relates to a distributed target tracking method based on improved joint probability data association. The method provided by the invention comprises the steps that (1) a motion model is established for each target of a sensor multi-target tracking system; (2) a data association filtering method is carried out on each sensor to acquire the state estimation of the target within a detection range related to each sensor; and (3) spatial association is carried out on the state estimation of each sensor, and then the state estimation of the same target is fused to acquire the final target state estimation value. The simulation result proves the performance of the algorithm. The method can achieve the same precision as a traditional joint improved version data association method, and is superior to a joint probability data association method in time performance. The time of the algorithm is reduced.

A filter mechanism comprises a plurality of coaxially arranged filter rolls each having a multitude of uniformly distributed filtering pores for retaining impurity particles in water, when it is mounted within a water filter. The filter rolls are made of a selected antirust material and therefore can be cleaned and reused once the filtering effect is deteriorating, so that the cost of maintenance and the pollution to the environment can be significantly reduced.

A method and a computer program product for sample rate conversion that features distributive or hybrid filtering to reduce unwanted artifacts, such as aliasing and the computational requirements to avoid the aforementioned artifacts. The method includes receiving, at a first sample rate, a plurality of data points, associated with a first signal, operating on the plurality of data points to associate the signal with a predetermined set of parameters, with the set of parameters including a first transition band having an image associated therewith; and varying the sample rate associated with the first signal by interpolation with an interpolator having associated therewith a second transition band, with the width associated with the second transition band being a function of a spectral separation between the first transition band and its image, wherein a second signal is produced having a sequence of data samples approximating the first signal.

A gradiently distributed filter material with gradually decreased pore diameter from top to bottom for high selectivity and low filter resistance is prepared through beating plant fibres to obtain pulp, dispersing the synthetic fibres and inorganic fibres in the aqueous solution of disperser, mixing, adding wet reinforcing agent, shaping by net, dewatering, reinforcing by resin, and drying again.

A network device coordinates with other devices in a network to create a distributed filtering system. The device detects an attack in the network, such as a distributed denial of service attack, and forwards attack information to the other devices. The devices may categorize data into one or more groups and rate limit the amount of data being forwarded based on rate limits for the particular categories. The rate limits may also be updated based on the network conditions. The rate limits may further be used to guarantee bandwidth for certain categories of data.

An L-band optical amplifier has a rare earth doped gain medium including a filter distributed over a finite physical portion of the gain medium. The filter is distributed over between about 25% to substantially the entire length of the gain medium. The distributed filter substantially eliminates out-of-band light emission (C-band ASE, 1520 nm-1565 nm) and thus improves the performance of L-band amplification (1565 nm-1620 nm). Examples of distributed filters include discrete type filters such as long period gratings, or continuous type filters such as rare earth doped, twin core fibers, non-adiabatically tapered fibers and coaxial resonant ring fibers.

A distributed filtering and sensing structure includes a base board divided into a plurality of regions, and more than ten filtering and sensing modules distributed on the respective sections, wherein the total area occupied by the filtering and sensing modules is less than one half of the total area of the regions, wherein each filtering and sensing module is used to receive a first electromagnetic wave with a first wavelength range. Each filtering and sensing module includes a non-organic filtering element for filtering the first electromagnetic wave to obtain a second electromagnetic wave with a second wavelength range; an electromagnetic sensor disposed under the non-organic filtering device for receiving the second electromagnetic wave; and an electron / hole collecting module electrically connected to the electromagnetic sensor. The second wavelength range is part of the first wavelength range. Furthermore, the distributed filtering and sensing structure can be applied on an optical device.

The invention discloses a global navigation satellite system (GNSS) / inertial / navigation system (INS) ultra-tight combination navigation apparatus and a relative navigation system thereof. On the basis of the traditional GNSS / INS ultra-tight combination navigation apparatus, the provided GNSS / INS ultra-tight combination navigation apparatus uses a distributed filtering structure. Slave filters are used for carrying out pretreatment on I,Q signals of all satellite channels; and the processed information is sent to a combined filter. Meanwhile, the GNSS / INS ultra-tight combination navigation apparatus is also applied to a relative navigation system; while the navigation state and the inertia measurement of a carrier itself are received, navigation information and a carrier phase of another carrier are also received; with a dual-different carrier phase and inertia measurement, recursion filtering resolving is carried out by using an optimal kalman filter and an optimal relative position and a relative speed between each two carriers among multiple carriers are estimated.

The invention relates to an emulsion high-pressure automatic back-flushing filtering device which comprises at least one group of filtering unit, wherein the filtering unit comprises a filtering body.The invention is characterized in that the filtering body is a flat square integral structure, the front part of the filtering body is provided with a two-way liquid inlet hole, a two-way liquid outlet hole and a two-way back-flushing drain hole which are laterally distributed, and the rear part of the filtering body is provided with at least three longitudinally distributed filtering holes. Theinvention has the advantages of no leakage, favorable rigidity, high capability of bearing high pressure, high safety, convenience in removing a filter element, compact structure and the like.

In a message delivery system, messages are carried over a network in packets. Server hosts support applications for originating and receiving messages and network interfaces. Switches interconnect the server hosts and form the packet network. Some of the switches are linked to the local server hosts. Distributed filtering / matching modules associated with the local server hosts register interests for applications on the associated local server hosts, inspect packets received over the network or from a local server host to match messages with registered interests and remove any unmatched packets from the packets. The matched messages are forwarded to the local server host for delivery to the applications. This system offers the ability to use special purpose hardware for the filtering / matching function without requiring connections to a common message broker.

Discussed herein are a sensor-network system and a method thereof for detecting and isolating faults occurring in sub-systems and sensors included in the network. The sub-systems and the sensor measurements are subject to noise and disturbances. A bank of Kalman-filters (KF) is used to detect and isolate the faults. Each KF is driven by either a pair of consecutive sensor measurements or a pair including a reference input and a sensor measurement. The KF residual is computed for each measurement pair and is a reliable indicator of a fault in subsystems and sensors located in the network.

The invention relates to a novel flat-sheet membrane module, which comprises filtering membranes and a support diaphragm plate for fixing the filtering membranes, wherein the support diaphragm plate is clasped with two front and back mesh plates through a frame; the front lateral surface and the back lateral surface of the support diaphragm plate are uniformly provided with densely distributed filter meshes; the two lateral surfaces are fixed with the filtering membranes in a mode of sticking or welding; membrane holes on the filtering membranes are communicated with a hollow inner cavity through the meshes on the support diaphragm plate; and a stream guiding area is arranged in the hollow inner cavity, and one end of the support diaphragm plate is provided with an effluent nozzle communicated with the stream guiding area. When the flat-sheet membrane module is applied, under the action of the negative pressure of a self-priming pump or the positive pressure of a filter hybrid hydraulic head, liquid infiltrates the surfaces of the filtering membranes, runs through the meshes of the support diaphragm plate to enter the hollow inner cavity, and then flows into an effluent trench through the stream guiding area and outflows from the outflow nozzle to realize the integral filtering process. The membrane module has the characteristics of easy machining, high utilization factor of the membrane, uniform distribution of pressure in the cavity and the like, is easy to be assembled into membrane assemblies in various forms, and is applicable in the fields of industrial filter and water treatment.

A negative pressure respirator 20' that has an integrally-disposed filter element 28 and that covers at least the nose and mouth of a wearer. The respirator 20' includes an exhalation valve 22 and an impactor element 50 that covers the exhalation valve 22. The exhalation valve 22 has a diaphragm and an orifice and opens in response to increased pressure when the wearer exhales to allow exhaled air to be rapidly purged from the mask interior. The impactor element 50 is positioned in the exhale flow stream to remove particles and other contaminants from the exhaled air. The exhalation valve and impactor element have a ratio of Zn:Dj of less than about 5. The respirator 20' is beneficial because it provides comfort to the wearer by allowing warm, moist, high-CO2-content air to be rapidly-evacuated from the mask interior through the valve 22 and also protects the wearer from splash-fluids and from polluted air while at the same time protecting other persons or items from being exposed to particles and other contaminants exhaled by the wearer.

The invention relates to a distributed filtering network system and a design method. The system comprises the following parts: a filter network unit comprising filters distributed at different physical sites; a sensor sampling unit comprising vehicle-mounted sensors and filtering sensors, wherein the vehicle-mounted sensors are embedded in an automobile suspension system and acquire state information of the automobile suspension system, and the filtering sensors are embedded into the filters and acquire exchange information between the filters and set adjacent filters; and an event trigger unit comprising event triggers corresponding to the filters, wherein each event trigger determines event occurrence time of a corresponding filter, at the event occurrence time, the filters receive the automobile suspension system state information acquired by the corresponding vehicle-mounted sensors and the exchange information of the set adjacent filters, and otherwise, the filters do not act. Compared to the prior art, the system provided by the invention can satisfy the demand of multiple terminals for simultaneously obtaining data, can also effectively prevent filter network collapse, and is low in energy consumption, high in efficiency and high in stability.

A method for constructing a radio frequency filter (100) includes depositing on a dielectric substrate (102) a plurality of layers of a conductive material (210, 216, 218, 220, 222), a dielectric material (217), and a sacrificial material (1200, 1500, 1700, 1900). The deposition is controlled to form at least one transmission line (104, 106, 108) including a shield (202) and a center conductor (204) disposed coaxially within the shield. The deposition is further controlled to form at least one distributed filter element electrically coupled to the center conductor (204), and at least one housing (402) electrically coupled to the shield. The method also includes dissolving at least one layer of the sacrificial material to form an interior channel (226) within at least one shield. The dissolving of the sacrificial material also results in the formation of a interior space within at least one housing containing the distributed filter element.

The invention provides a pipetting gun head structure with filter elements. The pipetting gun head structure solves a problem that pollution of one pipetting gun head causes cross infection on a pipetting gun and other pipetting gun heads, and the pipetting gun head structure guarantees accuracy of experimental data. The pipetting gun head structure comprises a pipetting gun head body and is characterized in that the pipetting gun head body is close to two vertically-distributed filter elements which are installed on a connection ring face of the pipetting gun in a filled mode, the two vertically-distributed filter elements comprise an upper filter element structure and a lower filter element structure, a cavity is left between the upper filter element structure and the lower filter element structure, and the upper filter element structure and the lower filter element structure are both formed by assembling a plurality of layers of high-density glass fibers.

An L-band optical amplifier has a rare earth doped gain medium including a filter distributed over a finite physical portion of the gain medium. The filter is distributed over between about 25% to substantially the entire length of the gain medium. The distributed filter substantially eliminates out-of-band light emission (C-band ASE, 1520 nm-1565 nm) and thus improves the performance of L-band amplification (1565 nm-1620 nm). Examples of distributed filters include discrete type filters such as long period gratings, or continuous type filters such as rare earth doped, twin core fibers, non-adiabatically tapered fibers and coaxial resonant ring fibers.

An optimized distributed state estimation method based on a sensor network is used in the field of control system and signal processing technology. The present invention solves the problem that existing conventional state estimation method cannot simultaneously process the state estimation of a sensor network with multiplicative noise and a non-linear interference phenomenon randomly occurring. Atthat same time, the method considers the influence of multiplicative noise and randomly occurring non-linearity on the state estimation performance, and a distributed filtering method based on Riccati-Riccati difference equation is obtained. Compared with existing conventional state estimation method of a nonlinear time-varying system, the method of the invention can control the estimation errorin a very small range, and can improve the estimation accuracy by more than 10% while being easy to solve. The invention can be applied to the field of control system and signal processing technology.

A power supply system is disclosed that includes a first interleaved power supply, a second interleaved power supply, and a common electromagnetic interference filter. The common electromagnetic interference filter is configured to provide DC power from a DC power source to both the first interleaved power supply and the second interleaved power supply. In one example, the common electromagnetic interference filter comprises a localized filter stage configured to receive DC power from the DC power source, and a distributed filter stage configured to receive DC power from the localized filter stage. The distributed filter stage includes a first set of common mode capacitors electrically connected to and physically proximate input power lines of the first interleaved power supply, and a second set of common mode capacitors electrically connected to and physically proximate input power lines of the second interleaved power supply.

The invention discloses energy-saving and environment-friendly grinding equipment for plastic recycling. The energy-saving and environment-friendly grinding equipment includes a shell, the left end ofthe upper surface of the shell is provided with a feeding hopper, the middle of the inner side face of the shell is provided with a circular plate, the upper surface of the circular plate is providedwith evenly distributed filter holes, the middle of the upper surface of the circular plate is provided with a crushing device, the upper end of the side face of a rotating shaft of the crushing device is rotatably connected with the shell through a bearing, and the lower end of the side face of the rotating shaft is rotatably connected with the upper surface of the circular plate through the bearing; and the upper end of the rotating shaft is provided with a driving device. According to the energy-saving and environment-friendly grinding equipment for plastic recycling, environment-friendlyplastics can be crushed, cut and ground, and the grinding strength can be adjusted; the environment-friendly plastics can be heated and dried, and the drying temperature can be observed and adjusted;and moisture reduction on the surfaces of the plastics is facilitated, thus the grinding effect is improved, operation is easy, and use is convenient.

A digital shunt system comprises an input signal partition cache module, a circular read and write control module, a circular judging sequence adjusting module, a weighted multiplier module, a time sequence synchronizing module, a multi-stage splicing-adding module, a distributed filter module, a position sequence arranging and computing module, a ping-pang cache module, a sequence FFT (fast Fourier transform) module and a snapshot output cache module. Weighted splicing operation is carried out in digital shunting of the digital shunt system by the circular judging method, the integral process is controlled by a clock and utilizes the circular judging structure, the output part is processed by FFT and is output in a frequency division and snapshot manner, time sequence is reinforced by the design, resource consumption is lower and signal processing is smoother.

The invention discloses a configurable inertial / celestial / Beidou multi-integrated navigation system, which comprises an inertial element, a Beidou receiver and a star sensor, wherein the inertial element, the Beidou receiver and the star sensor transmit data to a navigation computer module, the navigation computer module transmits a navigation calculating result to an upper computer for real-time displaying, and the upper host computer controls the navigation computer module at the same time. The invention further discloses a configurable inertial / celestial / Beidou multi-integrated navigation method, which calculates a main body by means of strapdown inertial navigation, adopts a distributed filtering scheme, and configures different combination modes and filtering time by means of the upper computer. The entire navigation device can select navigation modes such as pure strapdown inertial navigation, inertial / Beidou, inertial / celestial and inertial / celestial / Beidou, thereby facilitating the tailoring of a sensor module and verification of an algorithm. The configurable inertial / celestial / Beidou multi-integrated navigation system and the configurable inertial / celestial / Beidou multi-integrated navigation method can effectively solve the problems of transportability, real-time performance, precision and the like of the navigation method, and provide beneficial reference for the engineering and productizationof teaching, scientific research and multi-integrated navigation systems.

The invention provides a method for distributing sensors in collaborative detection. Based on the optimal Kalman distributed filtering, a new information entropy incremental computation method and a global optimal distribution scheme are put forward, only the optimal solution of a distribution equation formed by new information entropy increments, serving as parameters, of all targets to all single sensors under the constraint condition is calculated, and sensors attaching to the same target under the optimal solution form a sensor group of the target. The new information entropy incremental computation method is put forward, so that the problem that a covariance matrix of a target under distributed fusion filterers is not just linearly summed through a sensor group formed by respective covariance matrixes of multiple single sensor filters and multiple single sensors is solved.

The invention discloses a distributed filtering device for a MIMU and GPS combined navigation system, which comprises 5 difference comparison units and 5 filters. The difference comparison units and the filters respectively filter the course and speed information as measurement input and outputted by the MIMU and GPS, and transmit the information after filtering back to the MIMU for rectification; finally, the rectified speed, attitude and position information is used as the final output of the MIMU / GPS combined navigation system. The filtering device can reduce the calculated quantity of the system, has high error tolerance capacity, also compensates through real-time gyrodrift estimation, and accordingly improves the accuracy of the output information of the MIMU / GPS combined navigation system.