41results about How to "Suppress disturbing noise" patented technology

The embodiment of the invention provides a shift register unit circuit, a shift register, an array substrate and a display device and belongs to liquid crystal display technologies. According to the shift register unit circuit provided by the embodiment of the invention, a relatively small number of thin film transistors are adopted and are used for inhibiting interference noises in the circuit, so that the wiring space is reduced while the signal transmission function and the noise reduction function of a shift register unit are realized, the area occupied by the shift register unit circuit is reduced, and thus, a narrow border for a liquid crystal display with the shift register is realized.

A detection system of high sensitivity DC local discharge on large-capacity high voltage power device is prepared for providing high voltage DC voltage to balance detection impedance circuit by DC high voltage source, picking up local discharge signal of detected sample by balance detection impedance circuit, sending local discharge signal to differential amplification filtering circuit to carry out differential amplification filtering treatment than sending treated signal to data collection and analysis unit for obtaining detection and analysis result of local discharge signal.

The invention provides a face anti-counterfeiting method based on face depth information and edge image fusion, and the method comprises the steps: respectively extracting the edge information and depth image information of a face image through a double-flow network, carrying out the fusion of two types of features, and then carrying out the learning and classification through a feature fusion classification network, wherein a Sobel operator is used for extracting edge information of a face image, a PRNe is used for acquiring three-dimensional structure information of a face of a preprocessedliving body object, and adopting a Z-Buffer algorithm for projection to obtain corresponding living body face depth label. Depth information extraction network branches in the double-flow network extract differentiated depth information of living and non-living faces, and a weighting matrix and an entropy loss supervision mode are adopted to enhance the depth discrimination between a face area anda background area. Compared with the prior art, the method is slightly influenced by factors such as image quality and illumination, the problem that the hardware depth information extraction cost ishigh is solved, the characteristics of background information are expanded, and learning of redundant noise is weakened.

The invention discloses a five-phase inverter random SVPWM modulation method, and belongs to the technical field of multi-phase inverter drive control. In every sampling cycle, the sampling cycle is kept constant, a PWM pulse is delayed randomly, to achieve random change of a switch cycle, at the same time, two vector action time obtained through an NFV-SVPWM algorithm are randomly allocated, and double-random of switch frequency and zero vector action time is achieved. According to the five-phase random SVPWM modulation method, on the condition of not influencing low frequency-band harmonic performance, the amplitude of higher harmonic is drastically lowered, harmonic originally concentrated on the switch frequency and around the integral multiple switch frequency is dispersed into a wider frequency spectrum range, thus a more consecutive and even frequency spectrum is obtained, electromagnetic interference and high frequency noise are effectively inhibited, and the electromagnetic compatibility of the system is improved.

The invention discloses a five-phase inverter non-sinusoidal random SVPWM modulation method, and belongs to the technical field of multi-phase motor drive control. According to the method, two big vectors and two middle vectors which surround sectors which a fundamental wave reference voltage vector belongs to are selected to compound the fundamental wave reference voltage vector; a third harmonic reference voltage vector is compounded on a voltage vector corresponding to a third harmonic space through the chosen two big vectors and two middle vectors; when vector action time is calculated, in every sampling cycle, the sampling cycle is kept constant, a PWM pulse is delayed randomly, two zero action times are randomly allocated, and double-random of switch frequency and zero vector action time is achieved. According to the five-phase inverter non-sinusoidal random SVPWM modulation method, when a motor is driven, the torque amount of a fundamental wave current and a third harmonic current are linearly overlaid, thus the torque density of a system is increased, on the condition of not influencing low frequency-band harmonic performance, the amplitude of higher harmonic is drastically lowered, electromagnetic interference and high frequency noise are inhibited, and the electromagnetic compatibility of the system is improved.

The invention provides an optical fiber gas concentration detection method with temperature compensation capacity. The method comprises specific steps as follows: step one, a laser device generates two optical signals, and central wavelengths of the two optical signals are lambda 1 and lambda 2 respectively; step two, each optical signal is split into two beams by an optical splitter after being transmitted through an optical fiber and then passes through a reference gas chamber storing reference gas and a detection gas chamber storing to-be-detected gas; step three, the spectral line intensity of light emitted from the reference gas chamber and the detection gas chamber is measured for multiple times; step four, the spectral line intensity is subjected to linear fitting, and temperature influence fitting coefficients of monochromatic light absorption coefficients of two wavelengths are obtained; step five, the gas concentration after temperature compensation is calculated according to the fitting coefficients. According to the method, a temperature compensation model of an optical fiber gas detection system is built, the optical fiber gas detection system considering temperature change factors is realized, interference of environmental temperature change to detection is inhibited in a temperature compensation manner, measurement errors caused by environmental temperature change are reduced, and the detection precision of the system is improved.

A loudspeaker arrangement in a motor vehicle includes at least one loudspeaker, which is able to be driven by an audio processor, the loudspeaker being arranged as at least one electrostatic planar loudspeaker.

The invention relates to a channel optimization device for an electric wire high speed data communication system, which is connected between the user electric appliance and the electric wire power in series, and which includes device for filtering the phase wire and ground wire. The channel optimization device concretely includes low pass network part and filter circuit part, the low pass network part is connected with the eclectic wire power for restrain high frequency normal mode noise, the filter circuit part is connected with the user's electric appliance for restrain the common mode interference noise. Thus the invention improves the noise interference resisting ability of the electric wire high speed data communication system.

The invention discloses a precise simple-pendulum type relative gravity meter. One pendulum rod or two suspension fibers are connected with a cross beam, the lower portion of the pendulum rod or the lower portions of the suspension fibers are connected with a pendulum mass, and then a simple-pendulum system is formed. A support supports the simple-pendulum system through wear-resisting contacts on the cross beam. The stability of the environment where the simple-pendulum system is located is kept through a vacuum cavity, a temperature control system, an electrostatic shielding case and a damping base, equivalent pendulum length fluctuation is reduced, and therefore high-stability low-loss simple pendulum movement is achieved. A pair of capacitor displacement transducer polar plates are arranged over the pendulum mass and a pair of capacitor displacement transducer polar plates are arranged under the pendulum mass. The capacitor displacement transducer polar plates and the pendulum mass form a variable-area capacitor displacement transducer together, wherein the variable-area capacitor displacement transducer is used for measuring real-time displacement of the pendulum mass. A first oscillation starting and pendulum locking displacement executing machine and a second oscillation starting and pendulum locking displacement executing machine are installed on the two sides of the pendulum mass respectively, and therefore an oscillation starting and pendulum locking mechanism for simple-pendulum motion is formed. The precise simple-pendulum type relative gravity meter is simple in structure, convenient to use, beneficial to maneuvering observation and capable of achieving measurement of simple-pendulum type relative gravity on the level of the resolution of 0.1mgal.

The invention discloses a remote laser ranging method and device; a laser ranging controller controls a laser emitter to emit a laser pulse to a to-be-measured object, and forms a timing start signalin the same time; the laser pulse reaches the to-be-measured object via an atmosphere channel, so the to-be-measured object device can reflect the laser pulse, and the reflected laser pulse arrives ata small visual field laser receiver via the atmosphere channel; the laser receiver receives the reflected laser pulse, the reflected laser pulse passes spatial filtering, time filtering and spectrumfiltering, and reaches a photoelectric detector with an extremely high sensitivity; the photoelectric detector forms a return light electric pulse via photoelectric conversion, and the pulse serves asa timing end signal; the laser ranging controller calculates to obtain the distance information according to the timing start and end signals. The method and device can solve the technical problems that an existing laser pulse ranging method is low in a ranging distance.

The invention discloses a channel estimation method for a multi-user multi-input multi-output (MU-MIMO) system. The method comprises the following steps of: A, performing least square channel estimation by using a local pilot frequency of a user I and a received signal sequence at a pilot frequency position to acquire an estimation sequence; B, performing time bias estimation and compensation before separating users; C, sending the estimation sequence subjected to the time bias compensation into a filter to acquire an initial channel estimation value of the user I, performing transformation domain cyclic shift processing on the estimation sequence subjected to the time bias compensation, and then sending into the filter again to acquire an initial channel estimation value of a user II; and D, performing time bias recovery on the two users respectively to acquire a channel estimation value at the pilot frequency position. By the method, noise is reduced when users are separated, so that the realization complexity can be reduced obviously and the performance of channel estimation can be improved; and an operational formula of the filter is simplified by using an orthogonality characteristic of the pilot frequency of the users. The invention also discloses a corresponding channel estimation device for the MU-MIMO system.

The invention provides a generalized sidelobe cancellation broadband beam forming method based on frequency constraint. By performing new constraint on weight vectors of a main channel and an auxiliary channel of a GSC structure in a frequency domain, expected signals can pass through without distortion while interference is suppressed. The performance of the algorithm can be flexibly changed by controlling the number of the main channel array elements and the number of the auxiliary channel array elements, the calculation amount of the algorithm can be reduced while the degree of freedom is not wasted, and the practicability of the algorithm is improved. According to the method, the auxiliary channel weight vector is directly constrained through the constraint matrix, and the constraint matrix can be changed along with different target signals and arrays, so that the obtained auxiliary channel weight vector is most suitable for the current environment, and the premise of ensuring thatthe algorithm has high performance is also provided. According to the invention, the idea of frequency domain constraint is applied to the broadband beam forming method of generalized sidelobe cancellation without pre-delay, the calculation cost is low, and interference and noise signals can be suppressed to the greatest extent.

The invention relates to a weak plant electrical signal amplifier comprising an isolation variable resistance module, a differential amplification module, a second level amplification module, a filter module and a zero setting and power amplification module, wherein a collected weak plant electrical signal is transmitted to the isolation variable resistance module, an output end of the isolation variable resistance module carries out amplifying and filtering processing on the weak plant electrical signal through the differential amplification module, the second level amplification module and the filter module in sequence, and the weak plant electrical signal is transmitted to the power amplification module to complete the amplification of the power amplification module. The weak plant electrical signal amplifier provided by the invention can effectively amplify microvolt level plant voltage signals and can collect the plant voltage signals in multiple types, and the sensitivity is high.

The invention discloses a signal processing system for suppressing signal interference of a motor vehicle detection device. The signal processing system comprises a noise reduction circuit arranged between a switching power supply and the detection device, and a suppression circuit and an instrument amplification circuit which are connected with a sensor circuit of the detection device, the inputend of the suppression circuit is connected with the output end of the sensor circuit; and the output end of the suppression circuit is connected with the input end of the instrument amplifying circuit. According to the invention, power supply noise and signal interference are effectively suppressed, and the signal linearity and accuracy are improved.

The present invention provides an intelligent wearable system based on fetal heart rate signal, comprising: wearable device: collects the fetal heart rate data signal of the wearer, and communicates with a user terminal; user terminal: obtains the fetal heart rate data signal, directly Process the fetal heart rate data signal and transmit the processing result to a cloud computing platform, or transmit the fetal heart rate data signal to a cloud computing platform for processing; cloud computing platform: store the processing result, or process the fetal heart rate data The signal is processed, and the processing result is stored and returned to the user terminal. The invention improves the accuracy of fetal heart rate monitoring, greatly reduces the medical cost while improving the accuracy; the detection can be carried out comfortably and conveniently through the wearable device, and with the construction of the cloud platform, long-term information can be obtained.

The present invention provides a method and system for visualizing fetal heart rate data of a multi-dimensional channel sensor, including: collecting multiple dimensions of fetal heart signal data through a multi-dimensional channel sensor; projecting the fetal heart signal data into one-dimensional, two-dimensional or Three-dimensional space; the projection includes any one or more of the following: projection, clustering, principal component analysis and integral processing. The invention uses a multi-dimensional channel sensor to suppress interference noise, increases the amount of measured information, and uses dimensionality reduction information to visually display information. The use of dimensionality reduction information can not only simplify the display of existing information, but also dig out the information hidden in the data before. For example, the projection of space dimension and frequency dimension will display fetal movement, fetal position and other information.

The embodiments of the invention provide a chromaticblood flow imaging noise suppression method and device.Thechromaticblood flow imaging noise suppression method comprises the steps thatanultrasonicecho signal is received, and a complex signal and a first energy component are generated according to theultrasonic echo signal; the complex signal is subjected to a two-way treatment, a first image comprising a first velocity image component and a first variance image component and a second image comprising a second velocity image component and a mode image component are obtained respectively, the first image and the second image are marked respectively to obtain a first marked image and a second marked image, and the first marked image and the second marked image are treated according to a preset policy to obtain a binary image; a third image is generated according to the first energy component and the first image; the third image is subjected to mask calculation according to the binaryimage to obtain achromaticblood flow image. According to the chromaticblood flow imaging noise suppression method and device, blood flow interference noise can beeffectively suppressed, and thus accuracy of chromaticblood flow imaging is improved.

The invention provides an anisotropic magnetic sensor output circuit and a data wireless transmission and system control method. A differential output circuit is adopted, a positive output path and a negative output path are respectively connected to an amplifier for a two-path instrument and are subjected to amplification so that two paths of differential signals are produced. The differential signals are connected to a differential ADC driver. The driver provides enough electric currents for a later circuit. Positive and negative output parts of the driver are respectively connected to an analog input end of a first wireless transceiver module chip with an ADC. In the module, through AD conversion and primary processing, the data is sent to a second wireless transceiver module through a wireless channel. The second wireless transceiver module is connected to a computer. The data received through the second wireless transceiver module is transmitted to the computer through USB. A signal can be transmitted and amplified through a differential line transmission operational amplifier. Compared with a single-ended transmission method, the method provided by the invention can effectively inhibit interference noise in a line and improves a signal transmission distance.

The invention discloses a vehicle-mounted wireless charging device. The vehicle-mounted wireless charging equipment comprises a shell, a wireless charging coil accommodated in the shell and an NFC antenna substrate, the NFC antenna substrate is arranged above the wireless charging coil, an electromagnetic shielding device is arranged on the NFC antenna substrate, the electromagnetic shielding device comprises a grid type shielding body formed by conductive printing traces, and the grid type shielding body is arranged above the wireless charging coil. The grating type shielding body is arranged to selectively filter out frequency multiplication harmonic waves of the working frequency of the wireless charging coil. According to the invention, electronic devices do not need to be added, interference noise can be effectively suppressed by using the NFC antenna substrate through a specific PCB design, the EMC performance is improved, and the product meets the requirements.

The invention discloses a precise simple-pendulum type relative gravity meter. One pendulum rod or two suspension fibers are connected with a cross beam, the lower portion of the pendulum rod or the lower portions of the suspension fibers are connected with a pendulum mass, and then a simple-pendulum system is formed. A support supports the simple-pendulum system through wear-resisting contacts on the cross beam. The stability of the environment where the simple-pendulum system is located is kept through a vacuum cavity, a temperature control system, an electrostatic shielding case and a damping base, equivalent pendulum length fluctuation is reduced, and therefore high-stability low-loss simple pendulum movement is achieved. A pair of capacitor displacement transducer polar plates are arranged over the pendulum mass and a pair of capacitor displacement transducer polar plates are arranged under the pendulum mass. The capacitor displacement transducer polar plates and the pendulum mass form a variable-area capacitor displacement transducer together, wherein the variable-area capacitor displacement transducer is used for measuring real-time displacement of the pendulum mass. A first oscillation starting and pendulum locking displacement executing machine and a second oscillation starting and pendulum locking displacement executing machine are installed on the two sides of the pendulum mass respectively, and therefore an oscillation starting and pendulum locking mechanism for simple-pendulum motion is formed. The precise simple-pendulum type relative gravity meter is simple in structure, convenient to use, beneficial to maneuvering observation and capable of achieving measurement of simple-pendulum type relative gravity on the level of the resolution of 0.1mgal.

The invention provides an intelligent telephone repeater capable of eliminating feedback howling, inhibiting disturbance noise and enabling receiving and transmitting signals simultaneously asymmetric amplification belonging to the communication appliance field. The repeater comprises a receiving end and a transmitting end. A repeater transmitting level sampling circuit and a receiving level sampling circuit are accessed to an asymmetry function intelligent control module circuit through a level comparing module, connected to the telephone main machine transmitting end through a transmitting channel amplifying circuit and feedbacked to the transmitting level sampling circuit; the asymmetry function intelligent control module circuit is connected to a telephone handle earphone through a receiving channel amplifying circuit and a power amplifying circuit and feedbacked to the receiving level sampling circuit. The invention completely eliminates the singing and howling in the communication, enables the amplification of receiving channel to vary from 1 to 200 and that of the transmitting channel corresponding from 100 to 1. The invention automatically inhibits briefness sudden type and constant stable noise, and automatically changes the telephone to be a direct connection state when the noise strength is too large.

The present invention provides a frequency-constrained generalized sidelobe cancellation wide-band beamforming method. By performing a new constraint on the weight vectors of the main and auxiliary channels of the GSC structure in the frequency domain, the interference can be suppressed while the desired signal has no Distortion passes. By controlling the number of array elements of the main and auxiliary channels, the performance of the algorithm can be flexibly changed, and the calculation amount of the algorithm can be reduced without wasting degrees of freedom, thereby improving the practicability of the algorithm. The present invention directly constrains the auxiliary channel weight vector through the constraint matrix, and the constraint matrix will change with the target signal and array, so the obtained auxiliary channel weight vector is the most suitable for the current environment, which also guarantees the high performance of the algorithm premise. The present invention applies the idea of ​​frequency domain constraint to the broad-band beamforming method without pre-delay and generalized sidelobe cancellation, which has low calculation cost and can suppress interference and noise signals to the greatest extent.

The invention provides a fetal heart data visualization method of a multi-dimensional channel sensor and a system thereof. The fetal heart data visualization method comprises the steps that fetal heart signal data of multiple dimensions are collected through a multi-dimensional channel sensor; and the fetal heart signal data are projected to a one-dimensional, two-dimensional or three-dimensionalspace, wherein the projection comprises any one or more of projection, clustering, principal component analysis and integral processing. The multi-dimensional channel sensor is used for restraining interference noise, the quantity of measured information is increased, and information is visually displayed through dimension reduction information. By means of the dimension reduction information, existing information can be displayed in a simplified mode, and information hidden in the data before can be mined. For example, information such as fetal movement and fetal position can be displayed through projection of the spatial dimension and the frequency dimension.

The invention relates to a wide dynamic photoelectric detection system for testing the stray light coefficient of a point source transmittance method, and belongs to the field of optical performance testing of space optical instruments such as star sensors and space optical remote sensing imaging cameras. The invention solves the technical problems that the detection range of the existing detection device is not enough, and the combination of different types of photodetectors is used to produce non-linear technical problems in the test process. The wide dynamic photodetection system uses three identical wide dynamic photodetection devices to respectively detect the entrance pupil of the space optical system, the irradiance at the image plane and the background stray light, and the data acquisition computer collects the data of the photodetection devices through the RS422 interface and calculates the points Source transmittance. The invention realizes large-scale linear measurement of irradiance through three wide dynamic photoelectric detection devices, and the detection dynamic range is better than 10 9 , to meet the stray light coefficient test requirements of the point source transmittance method of space optical instruments, which is of great significance for the development of special stray light test equipment based on the point source transmittance method.

The invention provides a fetal heart detection sensor matrix of a multidimensional channel sensor, and fetal heart detection equipment. The fetal heart detection sensor matrix of the multidimensionalchannel sensor comprises a plurality of sensors, wherein each sensor comprises a plurality of sound sensitive unit groups; the plurality of sound sensitive unit groups adopt difference measurement toform a single collection channel; and each sound sensitive unit group comprises a plurality of sound sensitive units. By using a passive sensor, the potential hard of active emission to a pregnant woman and a fetus is completely avoided; interference noise is effectively inhibited, so that the activities in daily life cannot influence fetal heart monitoring data; lying still for measurement is notneeded; signals can still be accurately measured under the condition that the fetus position of the fetus moves; and the use by the pregnant woman or family members is convenient.

The invention discloses a five-phase inverter random SVPWM modulation method, belonging to the technical field of multi-phase inverter drive control. In each sampling period, the sampling period is kept constant, and the PWM pulse is randomly delayed to realize the randomization of the switching period. Double randomization of vector action times. The modulation method of the present invention can greatly reduce the amplitude of high-order harmonics without affecting the performance of low-frequency harmonics, and disperse the harmonics originally concentrated around the switching frequency and its integer multiples into a wider spectrum range , so as to obtain a more continuous and uniform frequency spectrum, effectively suppress electromagnetic interference and high-frequency noise, and improve the electromagnetic compatibility of the system.