40results about How to "Improve filtering ability" patented technology

A camera filter automatic switching device comprises a box installed on a camera; the box is provided with a lens opening which is corresponding to the lens of the camera; an installing frame which can slide directionally is installed on the lens opening; two parallel filters are fixed on the installing frame; a drive component which drives the installing frame to move is fixed in the box; wherein, the drive component comprises a micro-motor and an reduction gear set which rotate synchronously with the output shaft of the micro-motor; and a rack which is meshed with the reduction gear set is installed on a fixing frame. Simultaneously, the two ends of the box on which the installing frames are installed are provided with buffer components which prevent the installing frames from being rigidly collided with the inner wall of the box when sliding to a limit position. The invention has the advantages of compact structure, small size, high reliability, easy installation, simple use and control, good filtering effect, strong universality, and the like. With the ordinary micro-motor and a precision drive mechanism, the camera filter automatic switching device is not only provided with the advantages of the existing products, but also avoids the original shortcomings, thereby being more capable of meeting the market demand.

The invention discloses a high attenuation microminiaturte common mode transmission electromagnetic interference active filter, which includes ring high-frequency current-transformer, wherein three windings twine round the mutual-inductor; the coiling directions of three windings are the same; two windings connect the alternating current power lead-in end; another end connects the carry-in terminal of operational amplifier; the export of operational amplifier feedbacks signal to noise source device by two high-pressure capacitances and electric resistances. The filter has simple and reasonable structure, which has strong noise attenuation ability and good low-frequency filtering feature.

The invention discloses a magnetic levitation train suspension system position sensor signal processing method and device. The method includes the following steps that S100, real-time signals of a suspension system position sensor are obtained as to-be-processed signals; S200, a discrete time optimal controller is designed according to a discrete second-order series system, and a tracking differentiator corresponding to the optimal controller is constructed; S300, a suspension height signal and a speed signal required by a magnetic levitation train suspension system are obtained through the tracking differentiator according to the real-time signals of the position sensor; and S400, the obtained suspension height signal and the obtained speed signal are fed back to the optimal controller, and the system reaches the expected system state. The signals of the suspension system position sensor can be processed in real time, the filter capacity for noise of the signals is high, and thereforesafe and stable suspension of a magnetic levitation train can be guaranteed.

The invention discloses an LCL filter with coupled inductors and belongs to the field of design of power electronic devices. The input end of an alternating-current voltage side inductor of the filter is connected with an alternating-current voltage source, a counteracting inductor is connected with the output end of the alternating-current voltage side inductor in parallel after being connected with a filtering capacitor in series, a damping resistor can be connected with the filter capacitor in series or in parallel, or the damping resistor can be not adopted, the alternating-current voltage side filtering inductor and a rectification or inversion side filtering inductor are coupled and connected in series in the forward direction, and the output end of the rectification or inversion side filtering inductor is connected with a middle point of a rectification or inversion bridge arm. According to the LCL filter with the coupled inductors, not only can the size of the filter be reduced, but also the filtering effect can be improved.

The invention belongs to the field of hole machining, and particularly relates to a coupling hole precision machining method. The method includes clamping a workpiece on a rotary workbench of a five-coordinate numerical-control drilling machine, machining a first hole of coupling holes in a numerical-control manner, detecting the actual internal contour of the first hole in a layered manner through a contact probe, calculating the actual axis of the first hole by the least square method, reversely calculating the drilling point coordinate of a second hole according to the design parameter requirements of colliding points, regenerating the numerical-control machining program of the second hole, and machining the second hole automatically. According to the method, on the basis of an integral strategy of measurement and processing, contour measurement, data processing and hole machining of the coupling holes can be completed by clamping the workpiece once, the machining requirements for colliding precision of coupling holes with different diameters and inclined angles can be met, machining efficiency is high, precision consistence is high, 'zeroing' processing of machining errors is performed on the colliding points, and coupling hole precision machining is realized.

The invention relates to the technical field of electrical engineering, and provides an adaptive three-phase grid-connected converter phase-locked loop and a phase-locking control method thereof. Thephase-locked loop of the invention comprises a coordinate transformation unit, a delay signal offset module, a second-order generalized integrator, and a PI regulator. A grid voltage signal is input into the coordinate transformation unit. The output component of the coordinate transformation unit is input into the delay signal offset module. The output component of the delay signal offset moduleis connected in series with the second-order generalized integrator. A q-axis voltage component obtained by acquiring the difference between the output component of the delay signal offset module andthe output component of the second-order generalized integrator is connected in series to the PI regulator. The sum of the frequency difference output by the PI regulator and the rated angular frequency of the grid voltage is subjected to an integration link such that the phase angle of the grid voltage signal is obtained. The phase angle of the grid voltage signal is fed back to the coordinate transformation unit. The method can dynamically detect the grid voltage phase at high accuracy in the event of complex conditions, especially asymmetric grid faults and introduced harmonic components.

The invention discloses a method and system for filtering non-stationary non-Gaussian noise from PLC communication signals. The filtering method comprises that an actually measured PLC signal sequenceand the multi-dimension decomposition layer number in a PLC communication system are obtained; each layer of filtered PLC communication signal sequence is determined according to the multi-dimensiondecomposition layer number and a multilayer low pass filter cutoff frequency; the length of a time window of the present layer is determined according to the filtered PLC communication signal sequencein the present layer; an analysis sequence is constructed; pseudo Wigner-Ville distribution of the analysis sequence in the length of the time window of the present layer is determined; each layer ofthe filtered PLC communication signal sequence is recovered according to pseudo Wigner-Ville distribution, and a recovered PLC communication signal sequence is determined; and from the last of the multi-dimension decomposition layer number, non-stationary non-Gaussian noise is filtered from the PLC communication system according to the recovered PLC communication signal sequence of the present layer and the interpolated PLC communication signal sequence of the last layer. Thus, the non-stationary non-Gaussian noise can be filtered from the PLC communication system effectively.

The invention relates to a denitration and demercuration catalyst and belongs to the field of environment-friendly catalysts. Components of the catalyst form a Mo-V-W/TiO2-Al2O3 system, the functions of denitration and demercuration are achieved at the same time under the effect of the active components Mo, V and W and the carrier TiO2-Al2O3, the structure of tail gas filtering and exhausting equipment can be effectively simplified, and environmental protection cost is reduced. In addition, the catalyst has high dust interference resisting capacity, and still can exert maximum filtering performance on the basis that no frequent halt is needed for removal of accumulated dust, and the catalyst is uniform in aging speed, high in filtering-out capacity and long in service life.

The invention belongs to the technical field of optical detection and optical information processing, and is used for realizing filtering of discontinuous stripes, achieving a stronger denoising ability and a better filtering result. The technical scheme adopted by the invention is that a discontinuous fringe filtering method based on shear wave transform and machine learning includes: according to the direction and density of a discontinuous fringe pattern, the discontinuous fringe pattern is divided into several sub-images which are divided by discontinuous dividing lines by using a fuzzy C-means clustering algorithm, then the sub-images are filtered by shear wave transform, and the filtered results are added together to realize the filtering of the discontinuous fringe pattern. The invention is mainly applied to optical detection and optical information processing.

The invention discloses a method of computer video synthesis. The method comprises: receiving a video synthesis request of a user. The method is characterized in that the video synthesis request comprises a video material, an audio material and a material demand determined according to the video synthesis request. The method comprises the following steps: (1) determining a video, then generatingtime domain distribution information for video synthesis according to a determination result, synthesizing each media material through intelligent combination software, and after synthesis, performingnoise reduction on the synthesized video, wherein the noise reduction comprises the following steps: step (1) extracting three continuous frames of images of an input video: a previous frame, a current frame and a next frame. According to the method disclosed in the embodiment of the invention, in the process of synthesizing the video, the picture and the audio, corresponding special effects canbe added at the same time, the time required for video synthesis is shortened, the user experience is improved, the noise component can be better removed, the blocking effect is reduced, the details of the high-frequency part can be reserved, and the subjective visual perception is improved.

The invention discloses a nondestructive testing method for an open joint of a track plate, which comprises the following steps: presetting a track plate with an open joint under the same working condition of an engineering field as a standard sample, arranging a plurality of measuring points at the position of the open joint of the track plate, and receiving impact elastic wave signals generatedat the open joint; extracting the impact elastic wave signals by utilizing spectrum analysis, and taking a frequency spectrum characteristic value according to the frequency spectrum value of the impact elastic waves of each measuring point; arranging a plurality of measuring points on a track plate to be measured, carrying out coordinate positioning on the measuring points, and receiving impact elastic wave signals generated by point-by-point knocking; and calculating a frequency spectrum value of a signal tested by the track plate, comparing and analyzing the frequency spectrum value with the frequency spectrum characteristic value, and carrying out plane imaging on all the measuring points to obtain a distribution state plane graph of the open joint area of the whole track. The open joint and open joint damage of the adjusting layer of a ballastless track can be efficiently and quickly identified.

The invention discloses an atomic current sensor, which belongs to the field of electronics. The atomic current sensor comprises a light source control circuit, a light source, an atom absorption foam assembly and a sensor signal processing circuit, wherein the light source is controlled by using the light source control circuit; the atom absorption foam assembly is used for receiving an optical signal transmitted by the light source; and the sensor signal processing circuit interacts with the atom absorption foam assembly. Through the setting, the defect that an electromagnetic sensor applied in the fields of engineering detection of high-accuracy current detection, current metering detection and the like cannot well met requirements is overcome; and the atomic current sensor is simple in structure, has high measuring accuracy, and is suitable for popularizing and using.

The invention provides a monocular vision deviation detection method and device for an AGV, and the method comprises the steps: carrying out the gray processing and sampling of collected image data, calculating a dynamic segmentation threshold through sample image data, carrying out the threshold segmentation of gray data, and obtaining a binary image; screening the binary images, carrying out morphological filtering on objects which may be foreground noise, and carrying out threshold segmentation on filtered pixel points again; segmenting the acquired image by using grids, traversing all gridunits, and forming a set by the grid units containing foreground colors; clustering the elements in the set, and separating positioning blocks; solving a central point coordinate of the positioning block by adopting an average value method; and establishing a space conversion relation model between an image coordinate system and a pixel coordinate system according to the center point coordinatesof the positioning block, and resolving the deviation. According to the invention, the anti-interference capability of the AGV can be improved while the use precision is satisfied.

The invention provides a communication interference defense circuit. The communication interference defense circuit comprises two groups of circuits with the same structure, wherein the first group of circuits comprises a first differential amplification circuit, a first delay amplification circuit, a first comparison circuit and a first interlocking circuit which are sequentially connected from an input end to an output end; and the second group of circuits comprises a second differential amplification circuit, a second delay amplification circuit, a second comparison circuit and a second interlocking circuit which are sequentially connected from the input end to the output end. The input end of the first differential amplification circuit is connected with a first communication port, the output end of the first differential amplification circuit is connected to the first input end of the first interlocking circuit after sequentially passing through the first delay amplification circuit and the first comparison circuit, and the second input end of the first interlocking circuit is connected with the second output end of the second interlocking circuit; the first output end of the first interlocking circuit is connected with the second communication port, and the second output end of the first interlocking circuit is connected to the second input end of the second interlocking circuit. The communication anti-interference problem in the duplex communication signal transmission process can be solved.