36results about How to "Effectively filter out interference" patented technology

The invention discloses a 3D (three-dimensional) Gaussian space human behavior identifying method based on image depth information. The 3D Gaussian space human behavior identifying method based on the image depth information includes the steps: extracting human skeleton 3D coordinates in the depth information, normalizing the 3D coordinates and filtering joints with low human behavior identifying rate and redundant joints; building interest joint groups according to behaviors, checking human motion space characteristics based on Gaussian distance to perform AP (affinity propagation) clustering to obtain word lists of behavior characteristics, and performing data cleaning for the word lists; building human behavior conditional random field identifying models, and classifying the human behaviors according to the human behavior conditional random field identifying models. The 3D Gaussian space human behavior identifying method has high interference resistance for specific directions, skeleton sizes and space positions of a human body, high generalization capability for motion differences led in by different experiment individuals and excellent identifying capability for inhomogeneous similar behaviors.

The invention discloses a noise separation-based power transformer noise assessment method. The steps include: 1) building a voiceprint feature database in advance according to voiceprint feature information corresponding to noise signals generated by a fan component, an iron core component and a winding component when a standard power transformer is in different running states; 2) collecting in real time sound wave signals sent when a transformer to be tested runs, so as to obtain noise signals to be assessed; 3) separating noise signals generated by the fan component, the iron core component and the winding component from the noise signals to be assessed; and 4) extracting voiceprint feature information of each noise signal, identifying the running state of the transformer to be tested, and assessing the noise level of each component according to the running state. The noise separation-based power transformer noise assessment method provided by the invention can realize assessment of the noise level of each component in the power transformer utilizing acoustic characteristics, and has the advantages of easy operation implementation and high assessment precision and efficiency.

The invention discloses a large deformation flexible body dynamic stress measurement information conversion method based on neural networks, and belongs to the field of parachute measurement technologies and computer machine learning. The method is applied to the stress measurement in the movement process of a large deformation flexible body and especially applied to the stress measurement information conversion in the inflation process of parachutes, hovercrafts and the like. The method mainly includes the following steps of firstly, conducting voltage-stress calibration; secondly, filtering calibration data; thirdly, establishing a voltage-stress function; fourthly, obtaining voltage data under the actual environment and conducting filtering; fifthly, establishing the large deformation flexible body dynamic measurement data conversion neural network; sixthly, using the data training neural network under the actual environment; seventhly, obtaining and outputting stress information obtained through conversion. The voltage-stress information conversion is conducted through the neural networks, the calculation complexity is low, the conversion accuracy is high, and the method can be effectively applied to the dynamic stress measurement information conversion of the large deformation flexible body.

The invention belongs to the field of detection of traffic information, particularly relates to a piezoelectric magnetic-sensing traffic information comprehensive monitoring device and aims to provide a device with low cost and more complete functions. The comprehensive monitoring device is characterized by comprising a sensor group, a signal conditioning device, a data acquisition system and a data processing system, wherein the sensor group is connected with the signal conditioning device; the signal conditioning device is also connected with the data acquisition system; the data acquisition system is connected with the data processing system; and the data processing system is connected with a data center. By adopting the sensor group consisting of a geomagnetic image sensor, a piezoelectric sensor and a foundation temperature sensor, acquired parameters are comprehensive and precise and can meet requirements of traffic regulation and control. By adopting the signal conditioning device consisting of a first-level amplifying circuit, a second-level amplifying circuit and a high-pass filter, the measurement precision is improved. By adopting a data filter processing technology and a dynamic sampling storage speed technology based on a real-time vehicle speed, the data calculation precision can be improved effectively.

The invention belongs to the technical field of the mobile communication, and discloses an LTE uplink energy measurement method. The method comprises the following steps: detection equipment acquirespublic network information of a public network resided by user equipment through frequency sweeping; the detection equipment and the public network perform air interface synchronization; the detectionequipment acquires public network downlink data to decode PCFICH so as to acquire a CFI value, blindly detects the PDCCH to acquire uplink scheduling information; the detection equipment acquires theuplink data of the uplink scheduling information according to a HARQ mechanism; and the detection equipment measures the uplink energy of the user equipment according to the uplink data. The problemsthat the energy measurement can be started as long as the target user equipment is accessed to a pseudo base station in the existing positioning measurement method, the measurement distance is short,the measurement can be easily sensed by the target user, the volume and the power consumption of the detection equipment are large, and other user equipment can be easily interfered in the process oftracking and positioning the target user equipment are solved.

The invention relates to an underwater magnetic field and six-axis inertia combined positioning system. The system includes the following parts: (1) and (2) are respectively a sensing chip MPU6050 composed of a three-axis acceleration sensor and a triaxial gyroscope, (3) is a triaxial magnetometer RMG144, the two sensing chips send sensed each axis acceleration, acceleration and magnetic field intensity to a host processor (4) through an I2C bus, the host processor (4) finishes preliminary calculation of attitude and determines an absolute underwater space coordinate system, then attitude calculus and action signal discrimination are completed, the absolute position of the current underwater space and the button, function and the like needing control are output to a wireless transmission module (6), a power module (5) is responsible for power supply of the whole system, a receiving module (7) is responsible for receiving and decoding previous data and converts the data into a computer identifiable signal, and a computer (8) subjects the received data to processing and modeling, thus finishing the task of establishing an underwater space trajectory description system.

The invention discloses a high-precision air pressure automatic measuring device. A high-resolution air pressure sensor, data acquisition and control and communication and operation monitoring circuits, and a spare battery are all arranged in an anti-corrosion, antitheft and waterproof closed machine case; the closed machine case is buried underground or placed in a closed room; the air pressure sensor is connected with the atmosphere pressure through a connecting pipe; a porous fiber material which is used for producing a mechanical wave filtering effect on the damping reduction of air flow is arranged in the connecting pipe; a microprocessor in the closed machine case is used for acquiring atmosphere pressure data, receiving instructions, transmitting data, and monitoring operation; wireless communication equipment is used for data communication; and a solar panel and a spare battery are used for supplying power to a system. The device combines mechanical and digital wave filtration technologies, eliminates the interference from atmosphere pressure fluctuation caused by non-meteorological factors in the atmosphere, fully plays the performance of the high-resolution air pressure sensor, improves the accuracy of the atmosphere pressure measurement, and facilitates the detailed study on change of a weather system.

The present invention provides an impulse ultra-wideband communication method basing on a multi-field cooperative multiple access technique. The invention is a communication method of an impulse ultra-wideband system multiple access basing on multiple field cooperation to settle the problem of higher system error code rate caused by the increasing of the number of the describer and the increased probability of collision of different user signals in the ultra-wideband system. Firstly a linear superposition coefficient is calculated and is stored in a transmitting end superposition coefficient memorizer. A fundamental pulse waveform gn which is obtained by executing parallel moving weighted-superposition to the generated Chips waveform modulates the information b (t). The fundamental pulse waveform obtains a transmitting signal sn (t) according to the time hopping of the time-hopping sequence. The sn (t) is divided to two signals at the receiving end. The two signals are respectively executed with pn stage and 2-pn stage Fourier Transforms. When the domain filtering wave is executed with fractional Fourier Transform, a -pn stage and pn-2 stage fractional Fourier Transforms are respectively executed. The time domain reconstruction is obtained by adding two signals. According to the pulse waveform with a same shape of the transmitting end and the time-hopping sequence, a formwork signal generator generates an integration formwork signal and is related to the signal after reconstruction. The determination is executed according the relative result and the modulating mode and the information output apparatus outputs.

The invention discloses a detection method of a series direct-current arc in a direct-current brush motor electrical circuit. According to the method, one capacitor is connected in parallel to the twoends of a direct-current brush motor which generates interference high-frequency components, and a part of the interference high-frequency components are filtered out; and an inductor is connected inseries to a circuit between the direct-current brush motor which generates the interference high-frequency components and a current probe for series direct-current arc fault detection, so that high-frequency components generated by electrical equipment are prevented from flowing through the current probe for series direct-current arc fault detection. The current probe is used for measuring the capacitance and current in a detection circuit at a direct-current output side. By detecting the current measured on the current probe and performing time-frequency domain analysis on the current, generation of a series direct-current arc fault in the direct-current circuit can be judged according to increase of the amplitude of the current in a frequency domain. Through the method, an interferencehigh-frequency signal brought by the direct-current brush motor in the arc fault detection circuit can be filtered out, and the influence of the interference high-frequency signal on series direct-current arc detection is prevented.

The invention discloses an energy-saving LED display screen, which includes a display unit, a control unit, and a power supply unit. The display unit includes a box body and a module. A plurality of modules are arranged on the box body, and each module includes a PCB board. , LED lights, driver chips, wherein the LED lights are arranged on the front of the PCB board, the driver chip is arranged on the back of the PCB board, and the control unit includes a receiving card, a sending card, and a controller, wherein the receiving card is arranged in each box to communicate with the The module is connected, the sending card and the controller are arranged in the control center; the power supply unit includes the AC/DC power supply and the power supply cascading line arranged in the box; a current regulator is arranged in the box, and the input terminal of the current regulator is connected to the control The output terminal is connected to the power input terminal of the module, which is used to adjust the brightness of the entire LED display screen. It effectively saves electric energy and avoids the waste of electric energy caused by too high brightness.

The invention discloses a static LED display screen driving circuit. The static LED display screen driving circuit comprises LED lamps and driving chips. The three driving chips and the three groups of LED lamps form one display unit, each driving chip drives one group of LED lamps, each signal output pin of each driving chip is connected with one LED lamp, the static LED display screen driving circuit further comprises a filtering circuit, the filtering circuit comprises a power supply filtering circuit and a signal filtering circuit, the power supply filtering circuit comprises at least three capacitors with different capacitance values, the signal filtering circuit comprises magnetic beads, the input end of each control signal is connected in series with one magnetic bead, and the data input end and the data output end of each driving chip are each connected in series with one magnetic bead. According to the invention, three-grade capacitance value filtering is employed so that interference of each frequency range can be effectively filtered, and the magnetic beads are used for serial connection with signal input ends and signal output ends so that crosstalk can be effectively filtered, and signal completeness is guaranteed.

The invention discloses an energy-saving (light emitting diode) panel control system, which comprises an LED panel and a controller. The LED panel comprises a display unit, a control unit and a power supply unit, wherein the display unit comprises a box body and modules; the control unit comprises a receiving card which is arranged in the box body and connected with the modules; and the power supply unit comprises an AC/DC power supply arranged in the box body and a power supply cascade wire. The controller comprises a sending card and a control interface. The box body is internally provided with a current regulator. The LED panel is provided with a brightness sensor which is used for detecting the entire-screen brightness of the LED panel, and regulation is carried out on the entire-screen brightness of the LED panel. The control interface comprises a current brightness display window and a current regulating window, and the current regulator can be adjusted manually on the control interface. The system can automatically adjust the current regulator, and can also manually adjust the current regulator. The entire-screen brightness is regulated according to different external environments, thereby effectively saving electric energy, and reducing light pollution.

The invention discloses a hot roller temperature control device for superfine denier nylon 66 production, which comprises a roller body, a controller and a roller body temperature monitoring module, and is characterized in that the roller body temperature monitoring module comprises an infrared temperature sensor arranged above the roller body, and the infrared temperature sensor is used for detecting the heating temperature of the surface of the roller body; a detection signal is sequentially sent to the filter amplification circuit and the ripple elimination circuit for conditioning and then sent to the controller, and a detection feedback regulation circuit is further arranged at the output end of the filter amplification circuit and used for forming stable regulation in the filter amplification stage; the controller adjusts the heating temperature of the roller body in real time by controlling the heater in the roller body, so that the melting temperature of the hot roller is always in the optimal range value, it is guaranteed that fibers are evenly heated in the rapid production process, and the production quality is improved.

The invention discloses a radiation protection LED (light emitting diode) panel, which comprises a display unit, a control unit and a power supply unit, wherein the display unit comprises a box body and modules, the box body is provided with a plurality of modules, each module comprises a PCB (printed circuit board), an LED lamp and a driving chip, the control unit comprises a receiving card, a sending card and a controller, and the power supply unit comprises an AC/DC power supply arranged in the box body and a power supply cascade wire. The PCB comprises multiple layers which are sequentially arranged. The multiple layers of the PCB are two component layers, a power supply layer, at least one ground layer and at least one wiring layer, wherein the obverse side and the reverse side of the PCB are the component layers, the ground layer is below the obverse side and/or the reverse side of the PCB, the wiring layer is arranged between the power supply layer and the ground layer or is arranged between the ground layers. The PCB is provided with the independent and integral ground layer, thereby being capable of playing an effect of absorbing signal clutter, preventing electromagnetic radiation from spreading around, and avoiding influences imposed on operations of electronic equipment around.

The invention provides a high-voltage low-pass filter. The filter comprises an electric reactor and a capacitor, and the high-voltage low-pass filter is a low-pass filter with the voltage grade of 100kV or higher. The high-pressure low-pass filter further comprises a grading ring located at the top of the high-voltage low-pass filter and between the electric reactor and the capacitor of the high-voltage low-pass filter, so that the electric field intensity of the surface of a high-voltage electrode is reduced. The invention further provides a method for designing the high-voltage low-pass filter.