61results about How to "Filter implementation" patented technology

The invention relates to a mine channel wave signal wave-field separation method. An acquired channel wave signal is subjected to time frequency domain transformation to obtain a time frequency domain transformation time-frequency spectrum; a time frequency domain adaptive covariance matrix is structured; a distribution diagram of ellipticity and an azimuthal angle is obtained by feature values and feature vectors of the matrix; according to distribution features of the ellipticity and the azimuthal angle, filters for separating out different types of channel waves are structured to carry out filtering. The mine channel wave signal wave-field separation method has the benefits that only data of earthquake channel waves in the horizontal direction is analyzed, horizontal double-component earthquake wave data is subjected to time frequency domain transformation, the time frequency domain adaptive covariance matrix is structured, the distribution features of the ellipticity and the azimuthal angle, which are used for describing the size and the direction of a vibration track of a channel wave earthquake signal, are obtained, and the filters with different value ranges are structured to realize filtering on the collected channel wave data; compared with the prior art, the specific channel wave signal can be more rapidly, conveniently and accurately separated out, so that a mine stratum exploration effect is improved.

The invention discloses a macro-block filtering method, which is used for filtering 9-bit or 10-bit coding source data. The method comprises the following steps: searching an ALPHA table and a BETA table which are preset and used for supporting 10-bit range data for a value corresponding to a quantification parameter; and filtering a boundary with a filtering intensity which is determined according to the type of a prediction mode, macro-block coding information and the position of the boundary in a macro block if the difference of the values of pixels on two sides of the boundary is confirmed to be less than the value corresponding to the quantification parameter, wherein the values of the pixels on each component comprise 9-bit or 10-bit data. The invention also discloses a device for realizing the method.

A preparation method of sub-wavelength continuous surface microstructure based on negative refractive index lens: (1) quantify and decompose the target structure, and make a half-tone photolithography mask with graphic feature size on the order of nanometers; (2) The surface of the sheet is coated with photoresist, and then a spacer layer is coated on the surface of the photoresist substrate, and then a metal layer with a thickness of about 10nm-120nm is evaporated on the surface of the spacer layer; (3) a spacer layer is coated on the surface of the metal layer, The prepared halftone photolithographic mask is tightly pressed on the surface of the gap layer; (4) the incident light is vertically irradiated on the surface of the halftone mask to realize the exposure of the photoresist; (5) after the exposure is completed, the gap layer and the metal layer, and develop the photoresist to obtain the desired continuous planar structure. The invention realizes the preparation of the sub-wavelength continuous surface structure, and can be widely used in the preparation of various new functional devices based on surface plasmons.

The present invention provides a hearing aid having a near field resonant parasitic element, including: a microphone; a signal processor for processing input audio signal to compensate a hearing loss of a user of the hearing aid; a speaker connected to an output of the signal processor for providing a sound signal to the user; a transceiver connected to the signal processor. A circuit system comprises at least one element and / or further electric element in the signal processor, the transceiver, interconnecting transmission lines and an antenna structure, the circuit system extends over an area of a support substrate. The hearing aid also comprises a resonant element within a near field of the circuit system to terminate and dissipate unwanted electromagnetic radiation from at least a part of the area. The resonant element realizes a notch filter filtering the unwanted electromagnetic radiation, and can be positioned outside any signal paths of the circuit system.

The invention discloses a self-diagnosis method for faults of a rolling bearing retainer. The method comprises steps of rapidly filtering vibration signals through a high-precision rapid filter bank;selecting an optimal signal according to the spectral kurtosis of the mean square envelope autocorrelation signal of each filtered signal, and calculating an envelope spectrum of the optimal signal; then, automatically selecting the first M-order actual fault characteristic frequency according to the theoretical fault characteristic frequency of the retainer; automatically finding out a thresholdvalue meeting the probability requirement according to the statistical characteristic of the frequency spectrum; and finally, calculating a global test index and a fault occurrence rate of cyclic stability, and realizing self-diagnosis of the fault of the rolling bearing retainer. According to the invention, an effective self-diagnosis tool is provided for an intelligent bearing to analyze the fault of the rolling bearing retainer.

The invention discloses an FPGA-based buried pipeline damage harmonic magnetic field detection system and an implementation method. The system is characterized in that a magnetic information detection module comprises a harmonic magnetic field focusing detection probe and a power-adjustable pulse carrier excitation source, and is used for the detection and induction of a magnetic signal; the data acquisition module comprises acquisition and quantification of probe induction data under harmonic excitation; the data information high-speed processing module FPGA is used as a main control chip and is used for carrying out high-speed parallel acquisition, processing and communication on multi-channel data; the algorithm filtering module performs data cleaning to filter impurity signals in the magnetic signals and realize adjustable filtering parameters; the mobile displacement calculation module is used for positioning defects and marking strong magnetic interference under actual working conditions; the data storage module uses an ARM as a main control chip and is used for real-time arrangement and storage of data. The system is advantaged in that a problem of accurate positioning of pipeline damage is solved, accuracy of a defect detection result is guaranteed, engineering detection efficiency is improved, and the engineering detection requirement can be met.

The invention relates to a wideband frequency-agile frequency source. The frequency source comprises a synchronous crystal oscillation module, a fundamental frequency module, a frequency conversion module, a power calibration module, and a switch filtering module which are connected in sequence. The frequency source has the advantages that continuous frequency-dividing harmonic wave extraction is carried out on a fundamental frequency to achieve the purposes of ultra-wideband, small frequency steps and high frequency agility, stray indicators are improved, the system frequency conversion time is shortened, and the system reliability is improved.

The embodiment of the invention discloses a power signal filtering method and system using shrinkage gradient. The method comprises the following steps: step 101, acquiring a signal sequence S acquired according to a time sequence; 102, calculating a shrinkage factor beta; 103, solving an initial value x0<SM> of the shrinkage sequence x<SM>; 104, creating an iterative control parameter k and assigning 0, and creating a contraction step length tk and assigning delta T; step 105, solving a gradient vector shown in the specification; step 106, solving a shrinkage gradient function gk; 107, judging whether the shrinkage gradient function gk is smaller than an absolute value shown in the specification or not and obtaining a first judgment result; step 108, adding 1 to the value of the iterativecontrol parameter k, and calculating the kth step value of the shrinkage vector x<SM>; step 109, solving an adjacent error e; 110, judging whether the adjacent error e is greater than or equal to a preset threshold epsilon 0 or not to obtain a second judgment result; 111, recording a signal sequence SNEW from which noise is filtered, specifically, SNEW=xk<SM>;

The invention discloses an interference signal suppression device, which comprises a low noise amplifier module, a signal conversion module, a signal processing module and a power amplifier module. Inputted radio frequency signals are processed by the low noise amplifier module, the signal processing module and the signal conversion module and are then amplified and outputted by the power amplifier module. The signal conversion module is used for carrying out gain control on the signals inputted by the low noise amplifier module, carrying out first conversion processing on the signals after gain control, outputting the signals to the signal processing module, carrying out second conversion processing on the signals outputted by the signal processing module and outputting the signals to thepower amplifier module. The signal processing module is used for controlling the signal conversion module for gain control and carrying out gain compensation processing on the signals after first conversion processing. The invention also provides a method of suppressing strong interference signals. According to the device and the method disclosed in the invention, the communication quality of network communication equipment can be improved, the reliability of a communication system is improved, and the effect of expanding the application scenario of the communication system can be achieved.

The present invention provides a filter comprising a substrate, a dielectric layer on the substrate, a first metal layer in the dielectric layer, a trough-line resonant cavity formed in the first metal layer to expose the dielectric layer under the first metal layer, an input feed line and an output feed line. According to the technical scheme of the invention, the trough-line resonant cavity is formed in the metal layer, so that signals can be transmitted via trough-lines. Therefore, the signal filtering effect is realized. The filter is compact in structure and can be easily manufactured through the integrated circuit process.

The invention discloses a biological filtration device, which comprises a front pool and a biological filtration bed, the front pool comprises an adjustment pool for preliminary sewage treatment, a refluxing pool for receiving refluxed water from the biological filtration bed, a water-outlet sand-filtering pool for filtering the of the refluxed water from the refluxing pool for a second time; an ejector arranged on the ground floor for mixing the refluxed water from the refluxing pool and the sewage from the adjustment pool, and discharging the mixed water into the biological filtration bed; the biological filtration bed comprises a shell, a filling device which is arranged in the shell and is used for treating the sewage, an inlet connected with the outlet of the injector, an outlet connected with the refluxing pool; the biological filtration bed provides an air inlet and an air outlet for ventilation. The device is arranged underground, but the wearing parts are installed on the ground, therefore, the maintenance is convenient, and the device has strong capability to treat wastewater and does not cause sludge blocking.

The invention provides a lung CT image classification method based on feature migration. According to the technical scheme, the depth and the number of freezing layers of the pre-trained GoogLeNet network are determined through preprocessing, data enhancement and feature visualization of the CT image data, intrinsic information of the image is effectively extracted, and the classification accuracyand the classification efficiency of the model are improved. According to the invention, an adaptive CT image filtering algorithm is adopted to filter images acquired by different devices; contrast stretching is carried out on the CT image, image information is enriched, and image features are better extracted; a selection is provided for network depth determination of the model by using a feature map visualization technology, and hyper-parameter adjustment is reduced. By applying the method, the feature extraction problem of the label-free image can be solved, the problem of dimensionality disasters faced by high-dimensional image data classification is relieved, and the accuracy of image classification is remarkably improved.

The embodiment of the invention discloses a power signal filtering method and system using Dantzig total gradient minimization. The method comprises the following steps: step 101, acquiring a signal sequence S acquired according to a time sequence; step 102, solving the total gradient sparsity p of the Dantzig; 103, solving a delay matrix D; step 104, solving a Dantzig total gradient vector gamma;and step 105, solving a signal sequence Snew after the noise is filtered out.

The invention provides an ADS-B data filtering method and device, a computer device and a storage medium, relates to the technical field of aviation. The method is used for filtering ADS-B data and removing noise in the ADS-B data. The method mainly comprises: obtaining observation Gaussian distribution of ADS-B data at the current moment, prediction Gaussian distribution of the ADS-B data and a process error matrix Q, the observation Gaussian distribution comprising a covariance matrix R, and the prediction Gaussian distribution comprising a covariance matrix P; adding the covariance matrix P in the prediction Gaussian distribution to the process error matrix Q; fusing the observation Gaussian distribution and the prediction Gaussian distribution added with the process error matrix Q to obtain calibration Gaussian distribution at the current moment; updating the observation Gaussian distribution of the ADS-B data at the current moment according to the calibration Gaussian distribution at the current moment; wherein the observed latitude and longitude coordinates conform to the observed Gaussian distribution, and the predicted state vector conform to the predicted Gaussian distribution.

The invention discloses an adaptive code rate telemetry equipment FM quadrature modulation device and a method thereof, comprising a pre-filter module, which obtains a PCM data stream and filters it; an adaptive baseband modulation module receives the pre-filtered data and The code rate of the PCM data stream, after phase accumulation, outputs I and Q quadrature signals through the DDS module; the digital up-conversion module performs CIC interpolation and up-conversion on the I and Q quadrature signals to generate frequency modulation signals; the DA chip converts the frequency modulation signals Perform digital-to-analog conversion and then transmit it wirelessly. Based on the FPGA platform, the FM quadrature modulation of various code rates is realized through the improved adaptive code rate hardware architecture.

The invention provides an acquisition circuit of airborne vibration signals of an engine. A capacitor C4 used for filtering extremely-low frequency interference signals is added in front of a current limiting resistor of a negative input end of an operational amplifier of a single-ended electric charge amplification circuit. A feedback resistor R1 of the operational amplifier is connected to a joint between the capacitor C4 and the current limiting resistor. A feedback capacitor C3 is connected to the front end of the capacitor C4. The capacitance of the capacitor C4 is determined by working characteristics of the engine during change of rotation speed. According to the invention, complex interference signals in engine vibration signals of the engine can be effectively filtered and precise acquisition of the electric-charge type engine vibration signals is achieved.

The invention discloses a real-time filtering method for multi-frame joint detection and tracking algorithm output trace point sequences, and belongs to the technical field of radar target detection and tracking. In order to solve the problem that existing processing methods lack real-time performance in improving the tracking accuracy of a target, and the correlation between the trace point sequences output by a tracking algorithm before detection is difficult to calculate, a track point set belonging to the same target at the same time is first obtained according to the track point sequencesoutput by the tracking algorithm before detection in batches, then trace points in the track point set are separately subjected to Kalman filtering to obtain corresponding updated state estimate andposterior covariance estimate, and then a minimum value of the updated posterior covariance estimate is obtained based on the determinant minimization criterion to obtain corresponding weight values;and finally, the obtained weight values are used for obtaining the state estimate and the posterior covariance estimate after weighted sum, and the filtering of the track point sequences is completed.According to the real-time filtering method for the multi-frame joint detection and tracking algorithm output trace point sequences, the tracking accuracy of the tracking algorithm before detection is significantly improved.

The embodiment of the invention discloses a power signal filtering method and system utilizing an energy scale. The method comprises the following steps: step 101, acquiring a signal sequence S acquired according to a time sequence; step 102, solving an energy scale coefficient sequence; step 103, solving an edge energy scale coefficient; step 104, solving a direction energy scale coefficient; step 105, solving a direction scale threshold value; step 106, solving a high-density energy scale coefficient; and step 107, solving a signal sequence after noise filtering.

The invention provides a reactive power compensation device. The reactive power compensation device is a three-phase circuit which is connected with the three-phase bus of a power distribution network. Each phase circuit of the reactive power compensation device includes a high-pass filter resistor, a filter capacitor, a series reactor and a compensation capacitor, wherein the filter capacitor, the series reactor and the compensation capacitor are connected in series. The filter capacitor of each phase circuit of the reactive power compensation device is connected in series with the three-phase bus of the power distribution network. The compensation capacitor of each phase circuit of the reactive power compensation device is in common star connection on the tail end of the branch. One endof the high-pass filter resistor of each phase circuit of the reactive power compensation device is connected in series between the series reactor and the filter capacitor on the phase circuit, and the other end is in common star connection on the tail end of the branch. Compared with the prior art, the reactive power compensation device provided by the invention can form a C-type heterogeneous high-pass filter to filter out a variety of high-frequency harmonics without overload damage.

The invention provides a broadband filtering unit. The broadband filtering unit comprises a grounding supporting seat, a feed balun and a square radiating surface; the front surface and the back surface of the square radiating surface are both coated with copper; the shape of the copper coating the front surface is similar to four square structures combined together, and the two square structurespositioned on diagonal lines form two oscillator arms in a polarization direction; the middle position of each oscillator arm is completely hollowed out; each oscillator arm is composed of a pluralityof LC circuits which are connected in series; each oscillator arm is further provided with a plurality of open-circuit filtering branch knots. The broadband filtering unit is used for a multi-frequency multi-array combined antenna and can well avoid interference between the multi-frequency multi-array combined antenna and an adjacent array; the special multi-filtering structure of the broadband filtering unit can adapt to various special-shaped arrays, so that the antenna size is effectively reduced, the performance of an antenna interlaced array is improved; and the broadband filtering unitis simple in structure, convenient to install and low in cost; and meanwhile, expansion of different frequency bands and filtering of different frequency bands can be realized by adjusting the positions of the LC circuits on the radiating surface of the unit and the lengths of the filtering branch knots.

The invention belongs to the field of electromagnetic compatibility, relates to an anti-counterattack interference power supply filter for a direct-current system and aims to effectively suppresses reverse counterattack interference on a direct-current power supply bus by current surge generated in the operation of electrical equipment taking a high-power IGBT element as a core. The filter is mainly applied to a direct-current power supply system of a Dongfeng diesel locomotive, and is used for suppressing counterattack interference on a power supply bus caused by current surge generated during the operation of air conditioner frequency converter equipment connected with the power supply bus of the same direct-current system so as to improve the reliability and safety of other vehicle-mounted electrical equipment in the same direct-current system. The power supply filter provided by the invention comprises a set of full-balance structure pi-type low-frequency filter circuit module mainly used for suppressing electromagnetic interference of low-frequency components, a set of high-frequency filter circuit module which is composed of a full-balance four-order Butterworth low-pass filter circuit and is mainly used for suppressing the electromagnetic interference of medium-high frequency components, and a set of RDC damping absorption circuit module which is designed in a redundantmode and aims at suppressing high-amplitude direct current surge. According to the low-frequency filter circuit module and the high-frequency filter circuit module provided by the invention, the full-balance circuit structure form is adopted, so that surge of counterattack interference can be suppressed when fleeing into a bus from a positive electrode end or a negative electrode end.

The embodiment of the invention discloses a power signal filtering method and system using Mercer projection. The method comprises steps of step 1, inputting an actually measured signal sequence S; and step 2, carrying out noise filtering processing of the signal sequence S according to Mercer projection, wherein the signal sequence after noise filtering is SNEW, the specific formula is as follows, SNEW=WOPTS, the WOPT is an optimal projection matrix of the Mercer.

The invention provides an anti-interference detection circuit for a feedback pin of an LED driving chip. The anti-interference detection circuit comprises a detection circuit body and also comprises an anti-interference module, wherein the anti-interference module is connected with the detection circuit body and is used for preventing a feedback detection voltage of the detection circuit body from exceeding a fixed threshold value and filtering the feedback detection voltage. By the anti-interference detection circuit for the feedback pin of the LED driving chip, a protection mechanism can be prevented from being triggered by mistake due to excessive high feedback detection voltage, meanwhile, the interference of the feedback detection voltage can be effectively filtered on the basis of no influence on resonance detection of the feedback detection voltage, and the effectiveness and the accuracy of a detection result are improved.

The invention discloses an LED driving power supply. The LED driving power supply includes a rectifier circuit, a first filter circuit, an isolation transformer, a controller, a second filter circuit,a sampling feedback circuit, a pulse width modulator and a switching switch, wherein an output end of the rectifier circuit is sequentially connected with the first filter circuit, the isolation transformer, the controller and the second filter circuit, one end of the sampling feedback circuit is connected with the second filter circuit, the other end is connected with the pulse width modulator,the pulse width modulator and the switching switch are connected, and the switching switch is connected with the isolation transformer. The LED driving power supply is advantaged in that output is stable, power supply efficiency is high, and the power supply efficiency can reach 80-90%.

A self-diagnosis method for rolling bearing cage faults, fast filtering of vibration signals through high-precision fast filter banks, and then selecting the optimal signal according to the spectral kurtosis of the mean square envelope autocorrelation signal of each filtered signal and calculating Its envelope spectrum, and then automatically select the first M-order actual fault characteristic frequency according to the theoretical fault characteristic frequency of the cage, and then automatically find out the threshold that meets the probability requirement according to the statistical characteristics of the spectrum, and finally calculate the cyclostationary global test index and fault occurrence rate, The self-diagnosis of the fault of the rolling bearing cage is realized, the invention provides a method for automatically diagnosing the fault of the rolling bearing cage, and provides an effective self-diagnosis tool for the intelligent bearing to analyze the fault of the rolling bearing cage.

The embodiment of the invention discloses a power signal filtering method and system by using random projection. The method comprises the following steps: step 101, acquiring a signal sequence S acquired according to a time sequence; 102, solving a geometric random projection matrix Fe; 103, solving a Gaussian random projection matrix Fg; and step 104, solving a signal sequence Snew after the noise is filtered out.

The embodiment of the present invention discloses a power signal filtering method and system utilizing noise and jitter properties. The method includes: Step 101 to obtain the signal sequence S collected in time order; Step 102 to obtain the noise and jitter scale factor; Step 103 to obtain Noise jitter translation factor; Step 104 asks for N noise jitter factors; Step 105 asks for filtering threshold; Step 106 asks for N 2 filter weights; Step 107 obtains the signal sequence after filtering the noise.

The embodiment of the invention discloses a power signal filtering method and system using a conversion learning algorithm. The method comprises the following steps: step 101, acquiring a signal sequence S acquired according to a time sequence, step 102, solving the number of signal segmentation segments, step 103, solving a segmentation sequence, step 104, solving a sparse conversion control factor, step 105, initializing iteration process parameters, step 106, updating iteration process parameters, step 107, judging the value of the iteration control parameter and ending the iteration process, and step 108, solving a filtered signal sequence.