30results about How to "Reduce high frequency components" patented technology

The present invention discloses a non-isolated modularization three-level parallel inverter and a control method thereof and a control system thereof so as to achieve inhibition of a common mode resonance current, a ring current and a leak current. According to the non-isolated modularization three-level parallel inverter, a main control is arranged to I-shaped three-level inverter modularizationparallel, a filter is an improved LCL filter which changes a common mode loop structure to achieve inhibition of the high-frequency ring current and the leakage current. In order to inhibit the commonmode resonance caused by the improved LCL filter, the common mode loop is provided with an active controller to achieve inhibition of the common mode resonance current. The non-isolated modularization three-level parallel inverter further achieve the low-frequency ring current inhibition, the balance control of a neutral-point voltage at a direct current side and current tracking and the resonance inhibition of a difference module loop.

The invention relates to a high resolution satellite attitude fluttering detection method based on intensive control points, comprising the following steps of: 1, pre-processing a reference image; 2, intensively matching the pre-processed reference image with a satellite image obtained in real time; 3, resolving the satellite attitude fluttering. Compared with the prior art, the high resolution satellite attitude fluttering detection method can accurately detect the attitude fluttering phenomenon of the satellite platform by using the support of external reference data (DOM (Digital Orthoimage) and DEM (Digital Elevation Model)), and thereby restoring the actual state of the satellite on-orbit motion, and has the advantages of being high in accuracy and detection precision.

The embodiment of the invention discloses a video image processing method and device, an electronic device and a storage medium. The method comprises the following steps: acquiring a to-be-processed video image acquired by an image acquisition element; using a target low-pass filter to perform fuzzification processing on the to-be-processed video image, wherein the fuzzification processing is usedfor reducing a high-frequency component in the to-be-processed video image; encoding and compressing the blurred to-be-processed video image to obtain a target video image; and transmitting the target video image. According to the method, before video image data is input into an encoder, fuzzification processing is carried out, the high-frequency component in the video image is reduced, so that the problem that the data size distribution is not uniform when the processed video image is encoded by the encoder can be solved, the mosaic and block effects are reduced in the playing process afterthe video is integrally encoded, and the playing fluency is improved.

A continuous-time sigma-delta analog-to-digital converter includes a first integrator stage to integrate a difference between a first differential signal derived from a differential analog input signal and a second differential signal derived from a quantized output signal, a quantizer and a low pass filter. The first integrator stage has a differential operational amplifier, first, second, third, and fourth input resistors, and a first pair of integrating capacitors. The differential analog input signal is received at first and second input nodes of the converter. The first and third input resistors are coupled in series between the first input node and a first input of the operational amplifier. The second and fourth input resistors are coupled in series between the second input node and a second input of the operational amplifier. The first and second input resistors are coupled to the third and fourth input resistors, respectively.

A method includes following steps. The difference between the original pixel measured in spatial neighborhood of the pixel to be interpolated and the corresponding motion compensation pixel. The saiddifference value is utilized to estimate the compensation error. The estimated error is used to correct the motion compensation. The devices for executing the method includes the error detector utilized to detect and measure the differences between several original pixels and the corresponding motion compensation pixels, and the correcting compensator utilized to estimate the said differences andcorrect the motion compensation. The invention possesses the advantages of less operation quantity and good compensation effect.

The invention relates to a coordinating and smoothing control method for a wind turbine generator and an energy storing device and belongs to the technical field of safe and economical operation and control of a grid-connected wind power field. The method comprises the following steps: calculating the low-pass filtering cut-off frequency of the wind turbine generator, performing low-pass filtering on the output power of the wind turbine generator, calculating the high-pass filtering cut-off frequency of the energy storing device, performing high-pass filtering on power instruct of the energy storing device by adopting the cut-off frequency, outputting active power for power compensation of the wind turbine generator, and restraining the high frequency part of the output power of the wind turbine generator by the active power. The method not only is free of relatively largely modifying on a control strategy of the wind turbine generator, convenient in practical application, relatively slight in influence on the wind turbine generator stability and the wind energy utilization rate and capable of simultaneously effectively reducing the capacity and cost of the energy storing device, prolonging the service life of the energy storing device, and has a relatively good economic benefit.

The invention discloses an ultrasonic scalpel handle with an ultrasonic generator function. The ultrasonic scalpel handle comprises a handle outer shell, a handle connecting mechanism integrated witha torque wrench is arranged at the head of the handle outer shell, and the handle connecting mechanism is used for being connected with a cutter; a cavity is arranged in the handle outer shell, and atransformer, an energy converter, a first PCB plate, a second PCB plate, gear keys and a handle are arranged in the cavity; the PCB power plate is arranged at the top of the cavity; the transformer isarranged at the tail end of the cavity; the PCB control panel is arranged at the position of a handle of the cavity; the first PCB plate and the second PCB plate can be set to be control panels or power panels; the gear key is arranged at the front part of the handle outer shell and is used for switching high and low power gears; and the handle is arranged at the front part of the handle outer shell and is used for controlling the opening and closing of the cutter. The invention further discloses an ultrasonic scalpel system with the ultrasonic generator function.

The invention discloses an improved virtual flux linkage orientation-based harmonic detection method. According to the method, a virtual power grid flux linkage is adopted as an improvement link of aphase-locked loop; the extraction of a positive sequence flux linkage is realized by means of a compound third-order generalized integrator and a positive and negative sequence component calculation module; on the basis that the phase angle and frequency of a power grid are accurately locked, the detection errors of a traditional ip-iq harmonic detection algorithm, which are caused by reasons suchas power grid voltage asymmetry, waveform distortion, direct-current offset component injection and even frequency change, are avoided, so that fundamental wave positive sequence current finally obtained by a system is basically free of distortion.

The invention discloses a medical radio frequency output power adjusting method and system, and the method comprises the steps: S1, obtaining a radio frequency power signal outputted by a power amplification module; S2, judging whether the power of the output radio frequency power signal is smaller than a preset threshold value or not, and if not, adjusting the power of the radio frequency power signal through a power switch control signal adjusting method; if yes, adjusting the power of the radio frequency power signal through a voltage adjusting method; and S3, inputting the radio frequency power signal corresponding to the adjusted power into a power amplifier for processing, and outputting the processed radio frequency power signal by the power amplifier. According to the invention, quick response under high power and good output waveform (closer to sine wave) during low-power output are maintained. When the output waveform is close to a sine wave, high-frequency components are few, and an accurate sampling result can be obtained by using relatively low sampling frequency.

The invention relates to the technical field of inverters, in particular to a double-frequency transformer-free single-phase photovoltaic grid-connected inverter which comprises an inverter shell, a circuit board is arranged in the inverter shell, and a control unit and a main loop unit are arranged on the circuit board, the main loop unit is divided into a power unit and a resonance elimination unit, and the resonance elimination unit and the power unit are connected to two sides of a single-phase power grid in parallel; the bus cathode of the resonance elimination unit is connected with thebus cathode of the power unit through a connecting capacitor; the LA terminal and the LB terminal of the power unit are connected to the L terminal and the N terminal of a power grid through a power filter. The HA terminal and the HB terminal of the resonance elimination unit are connected to the L terminal and the N terminal of the power grid through a resonance elimination filter to form the main loop unit; through a novel topological structure and a control algorithm, the ground leakage current of the transformerless grid-connected inverter is effectively suppressed, and meanwhile, the overall efficiency and the power density of the inverter are improved.

The invention relates to a method for detecting and reducing reception interferences, especially multiway reception interferences, in an input signal (E) of a radio receiver. According to said method, a reception interference of this type is detected in a detector device (10) and a corresponding detector signal (MWS, AMS, MKS) is transmitted to a processing device (20) which then evaluates this detector signal (MWS, AMS, MKS). A corresponding control signal (S) is then generated by the processing device (20) and transmitted to an audio unit (30), which generates an audio signal lying in a frequency interval delimited by a lower limit frequency (GO") and an upper limit frequency (GO'). The audio unit (30) lowers the level of the audio signal (A) generated by the same using the input signal (E) within the frequency range above a lowered upper limit frequency (G1', G2') below the aforementioned upper limit frequency (GO') of the audio signal (A). According to the invention, the level of the audio signal (A) is lowered in the range below a lower limit frequency that has been raised above the aforementioned lower limit frequency (GO") at the same time as the level of the audio signal (A) is lowered in the frequency range above the lowered upper limit frequency (G1', G2').

The invention provides a method for denoising and filtering a flat area, which comprises the following steps of: S1, determining a block to be filtered which meets the following two conditions: 1) the number of gray values is 2, and the difference between the two gray values is 1; 2) the number of one gray value is larger than a set threshold value, and the number of the other gray value is smaller than the set threshold value, and the gray values are called a large probability gray value b and a small probability gray value s respectively; S2, denoising and filtering: 2.1, when the pixel point spacing is set to be 1, calculating the gray level co-occurrence matrix of the to-be-filtered block, judging the distribution condition of small-probability gray levels, wherein the smaller the number of the adjacent small-probability gray levels is, the larger the sum of diagonal lines is, and the more discrete the small-probability points are; on the contrary, the textures of the small probability points are thicker; reducing the filtering intensity of the small-probability gray block of the coarse texture; increasing the filtering intensity of discrete small-probability gray blocks; and S2.2, reducing blurring of the coarse texture or eliminating of the coarse texture. According to the method, the strong noise in the flat area is filtered, the residual error information amount is reduced, and the noise consumption of the code stream is further reduced.

The invention provides an intelligent positioning method and device for an impact load, and belongs to the technical field of impact positioning. The problem of impact positioning in the prior art is solved. According to the intelligent positioning method and device for the impact load, sensor arrays arranged in four directions around an impact area are included, each direction sensor array comprises two sensors arranged in the outward radiation direction relative to the center of the impact area, and the four sensor arrays are located in the same plane. The shock wave velocities of the two sensors of the sensor array can be approximately the same, so that the number of unknown numbers can be reduced, and the equation set can be solved. The included angle between the axial direction of the sensor and the shock wave propagation direction is larger than or equal to 45 degrees, at the moment, the sensitivity of the fiber bragg grating sensor is high, meanwhile, high-frequency components in amplitude-frequency characteristics are few, and detection of the sensor is facilitated. The detection precision is improved by eliminating the sensor array with the largest included angle with the impact source.

The invention provides an image compression processing method and apparatus, an electronic device and a storage medium. The method comprises the steps of obtaining a to-be-processed Bayer image; wherein the Bayer image to be processed adopts GRBG * color arrangement; the GRBG * color arrangement in the Bayer image to be processed is converted into YUVY * color arrangement; performing format conversion on the data of the YUVY * color arrangement to obtain target color array data; filtering the target color array data; and carrying out compression processing on the filtered target color array data. According to the image compression processing method and device, the electronic equipment and the storage medium provided by the invention, the resolution ratio of the image before and after compression processing can be ensured to be unchanged, meanwhile, the correlation of RGB color space is eliminated, the high-frequency component between pixels is reduced, and the image quality is improved.

The embodiment of the invention provides a performance warning method and device. The method includes the steps of obtaining a first performance data set, wherein the first performance data set comprises M performance data corresponding to first performance; conducting smooth filtering on the first performance data set so as to determine the first performance data set where filtering is conducted; determining whether to trigger the performance warning corresponding to the first performance or not according to the performance data in the first performance data set where filtering is conducted. By means of the technical scheme, high-frequency components and low-frequency components in the performance data can be reduced, and the shock of the performance data can be reduced. Thus, the frequency performance warning and warning recovery caused by the shock of the performance data can be reduced.