39 results about "Distortion ratio" patented technology

The invention discloses a multi-parameter distortion compensation method for a fractured rock mass seepage similar model test, and relates to the technical field of rock mass engineering physical model tests. The method comprises the following steps of: firstly, determining two constraint conditions that the fluid property is invariable and the gravitational acceleration is invariable, correspondingly selecting a basic physical quantity and extracting a core criterion; then analyzing three types of distortion sources of geometric dimensions, dielectric materials and boundary conditions, and establishing a distortion function according to result parameters of seepage flow velocity, seepage flow and seepage pressure; secondly, parameters difficult to control are selected as distortion items, parameters easy to regulate and control are selected as compensation items, the distortion items are substituted into a distortion function to obtain a distortion ratio, the optimal distortion ratio of the compensation items is solved based on a compensation balance formula, and the parameters are adjusted; and finally verifying the interval range of the actually measured distortion ratio. According to the method, the multi-source distortion coupling influence is accurately quantified, the compensation pertinence and precision are improved, operation is easy and convenient, universality is high, and reliable support is provided for underground engineering seepage research.

The invention discloses a power supply output control method and system based on adaptive pulse width adjustment, and relates to the technical field of power supply control, and the method comprises the steps: collecting an analog envelope signal for preprocessing, and generating a probability that an amplitude falls into an interval; establishing a shortest undistorted pulse width reference model, calculating the shortest undistorted pulse width in combination with the probability that the amplitude falls into the interval, correcting the shortest undistorted pulse width, obtaining an adaptive reference pulse width, carrying out pulse edge detection, calculating an integer frequency reduction multiple and a fractional multiple correction factor, and carrying out fractional multiple frequency reduction on effective pulses to obtain a target output frequency; on the basis of the target output frequency, allocation division and allocation verification of the pulse edge are executed, and on the basis of an allocation verification result, weighting operation is executed to generate a voltage value of a step waveform; according to the invention, the distortion rate of the output waveform is reduced, and the frequency division precision and the balance of pulse distribution are remarkably improved, so that the overall energy efficiency and reliability of power supply output control are improved.

An electronic device with which a user can see an image with less distortion is provided. The electronic device includes a display apparatus and an optical device. The optical device includes a position adjustment mechanism and can perform eyesight adjustment. The display apparatus displays a correction image that has been distorted from an original image into a barrel shape to correct distortion aberration of a lens. A correction amount of the correction image (a size and a distortion rate of the image) is changed according to the position of the lens moved by the position adjustment mechanism. This enables the image to be corrected to an optimal state at all times even when the position of the lens is moved for the eyesight adjustment and thereby improves the quality of the image to be seen.

The invention discloses a multi-satellite large-scale MIMO (Multiple Input Multiple Output) downlink precoding method and a multi-satellite large-scale MIMO downlink precoding system considering power amplifier nonlinearity. According to the method, different time delays and Doppler frequency shifts of different satellite signals arriving at a user terminal are considered, and pre-compensation is carried out on each satellite sending signal; the input and output characteristics of the satellite side nonlinear power amplifier are modeled by using the polynomial model; establishing an optimization problem to jointly design a precoding vector and a receiving vector; the signal interference noise distortion ratio in the optimization problem considers interference and distortion from other satellites, interference and distortion in the satellite and a noise item; and converting a sum rate maximization problem into a weighted mean square error minimization problem for solving. And a traditional iteration updating step is further mapped into a learnable network layer structure through a deep expansion algorithm, so that the calculation complexity is reduced. Compared with the traditional method, the method provided by the invention is more in line with the actual transmission condition, can improve the system performance and reduce the online calculation overhead, and is suitable for the precoding design in a multi-satellite communication scene.

A transmission apparatus repeatedly inserts reference signal sequences into a transmission signal sequence at different timings, and converts the transmission signal sequence, into which the reference signal sequences are inserted, into an optical signal. The reception apparatus includes a detection unit, a waveform equalization unit, and a signal quality measurement unit. The detection unit receives the optical signal transmitted through an optical transmission line, and converts the received optical signal into a reception signal of an electrical signal. The waveform equalization unit performs waveform equalization on the reception signal converted into the electrical signal. The signal quality calculation unit extracts a reception signal sequence set in each section corresponding to the reference signal sequence from the received signal on which waveform equalization performed. For each combination of different sections, the signal quality calculation unit calculates a mean square error between the mean of the reception signal sequences set in the sections included in a combination and the reference signal sequence, and calculates a signal-to-noise ratio and a signal-to-distortion ratio of the reception signal using the mean square error calculated for each combination.

The present application provides a method, apparatus and device for digital processing of text, which relates to the technical field of information processing, and can reduce the distortion rate of the digital standard point set in text restoration, and improve the restoration degree and aesthetic effect of text. The method includes: obtaining first skeleton information of the target text, where the first skeleton information is a plurality of pixel points extracted from the target image, and the target image is an image corresponding to the target text; correcting the pixel points with errors in the first skeleton information to obtain second skeleton information; performing stroke division and stroke order restoration on the second skeleton information to obtain first stroke order information; and performing widening processing on the pixel points in the first stroke order information according to the line width information to obtain the standard point set of the target text.

Disclosed herein is a method and system for training a neural network. According to one embodiment, the method includes receiving a noisy signal, generating a denoised output signal, determining a signal-to-distortion ratio (SDR) loss function based on the denoised output signal, determining a perceptual speech quality assessment (PESQ) loss function based on the denoised output signal, and optimizing a total loss function based on the perceptual speech quality assessment loss function and the signal-to-distortion ratio loss function.

The invention relates to the technical field of analog-to-digital converters, and particularly discloses a capacitance mismatch background digital correction method applied to a high-precision successive comparison analog-to-digital converter (SAR ADC). In order to solve the problems of limited calibration range and low convergence speed in the traditional correction technology, the invention provides a correction scheme combining a split ADC structure and disturbance reverse injection. The method comprises the following steps: constructing a complementary segmented capacitor array, inserting redundant capacitors, and optimizing weight distribution through capacitor sorting grouping and bridging; a dual-channel Split ADC is used for synchronous sampling, a disturbance signal is generated and reversely injected, and the capacitance weight is dynamically adjusted in combination with a least mean square (LMS) iterative algorithm; iteration is carried out until the output difference value of the two channels is zero, the real capacitance weight is obtained, and a correction result is output. The non-linear mismatch calibration range is expanded through the disturbance signal, the convergence speed is remarkably improved, and the normal conversion process of the ADC does not need to be interrupted. Simulation shows that after correction, the effective number of bits (ENOB) is increased to 15.75 bits from 9.09 bits, the signal-to-noise distortion ratio (SNDR) reaches 96.60 dB, convergence is completed in a 15k sampling point through the algorithm, and the algorithm is superior to a traditional Split ADC technology.

The invention is suitable for the technical field of impedance calculation, and provides a new energy station impedance calculation method, which comprises the following steps: inputting acquired broadband impedance characteristic data into a preset clustering algorithm model for clustering analysis, and generating a plurality of unit clusters; calculating an equivalent impedance characteristic of the current cluster, and determining an equivalent frequency domain network equivalent FDNE unit corresponding to the current cluster according to the equivalent impedance characteristic; constructing a function taking maximization of a stability margin and minimization of a harmonic distortion rate as optimization targets, and solving an optimal solution set of the function by taking key parameters of each equivalent FDNE unit of the equivalent frequency domain network as optimization variables; according to the actual electrical topology of the new energy station, the optimized FDNE units are connected, and a full-field equivalent simulation model is constructed; calculating the equivalent impedance characteristic of the grid-connected point of the new energy station through a full-field equivalent simulation model; the calculation efficiency is greatly improved on the premise of ensuring the modeling precision.

A belt type high-pitch vibrating diaphragm forming device with an arc-shaped structure comprises a pressing device, a laser device, a folding device, a cutting device and a positioning device, and the laser device is used for cutting metal foil to form a metal circuit layer; the pressing device is used for hot-pressing the metal circuit layer to fit the metal circuit layer on the base layer; the folding device is used for folding the pressed product into a wave shape; the cutting device is used for cutting the wavy vibrating diaphragm into a required shape, and the positioning device is used for assembling and forming the wavy vibrating diaphragm and the outer frame; the vibrating diaphragm provided by the utility model has extremely high frequency response and excellent tone quality performance in performance. And the production cost can be saved in process manufacturing, the structural design of the shape of the product can also enable the product to have better sound listening performance, and a plurality of different materials and different product shapes can be combined and matched. The high-frequency ductility of the vibrating diaphragm is better, the distortion rate is lower, and the horizontal directivity is wide. And the product has the advantages of flexibility, diversification and customization.

The present invention discloses a low-latency layered video coding method, computer equipment and medium, relating to the field of video coding. The method includes calculating the reconstruction distortion and motion compensation prediction error of each pixel block based on the initial quantization parameter of the current frame to be coded and the Lagrange multiplier determined based on the influence degree of the current frame to be coded on subsequent frames, determining the distortion influence factor of each pixel block in the current frame to be coded based on the influence degree of the current frame to be coded on subsequent frames, the reconstruction distortion and motion compensation prediction error of each pixel block in the current frame to be coded, determining the weight factor of the pixel block according to the distortion influence factor, and encoding the current frame to be coded based on the Lagrange multiplier and quantization parameter of the coding tree unit calculated above. The present invention takes into account key frames and non-key frames, sets the influence degree of key frames on subsequent frames to be greater than the influence degree of non-key frames on subsequent frames, and uses the distortion influence factor to calculate the distortion influence factor, thereby improving the distortion rate performance of video coding.

The application discloses a kind of real-time dynamic identification and positioning method for sugarcane stem node, comprising the following steps: (1) collecting sugarcane sample;(2) making dataset;(3) selecting model and evaluation index;(4) improving sugarcane stem node recognition model;(5) distortion correction of sugarcane stem node position;(6) selection optimization of cut position: based on the pixel position of stem node after distortion correction in step (5), the cut position is calculated, and the selection of cut position is optimized.The real-time dynamic identification and positioning method for sugarcane stem node of the application improves the model in detection accuracy and speed by improving the multi-scale detection structure, then introduces Ghost structure to achieve the effect of simplifying the model.Secondly, the transverse distortion ratio function is fitted by using polynomial function and least square method, which solves the problem of picture transverse distortion, makes the cutting operation more reliable, and improves the cutting accuracy.Finally, the selection optimization algorithm of cutting position is designed to improve the reliability of cut selection.

The invention provides a simulation joint coding modulation method, device and equipment based on amplitude probability shaping, and the method comprises the steps: carrying out the deep coupling of S-K mapping coding and multi-ring constellation modulation based on amplitude probability shaping, and constructing a geometric shaping and probability shaping joint modulation architecture; wherein the radius of each ring of the constellation diagram is jointly determined by an amplitude scaling factor and a cumulative probability, uniform phase offset is introduced between adjacent rings to optimize geometric layout, and then the signal distortion ratio is maximized through joint iterative optimization of S-K mapping coding parameters, constellation amplitude and phase parameters, so that the system complexity is not increased, and the system performance is improved. Cooperative adaptive optimization of coding and modulation can be realized by a single modulation architecture, and the end-to-end transmission performance of the system is remarkably improved.

The present invention discloses a MEMS speaker and a method for improving its performance. By applying a DC bias voltage to the peripherally clamped speaker, its linear working range is expanded, the output sound pressure level is increased, and the distortion rate is reduced. By applying the DC bias voltage, the speaker can be bent. As the DC bias voltage increases, the working mode transitions from the bending mode to the stretching mode, which can improve the driving efficiency of the speaker / correct the linearity of the speaker, allowing the speaker to generate a larger displacement and sound pressure level output under the same distortion rate requirement. By adjusting the magnitude of the DC bias voltage of the speaker, the linear working range of the speaker can be expanded, thereby reducing the total harmonic distortion of the speaker and increasing the output sound pressure level.

This invention relates to the field of cross-section borehole positioning technology, specifically disclosing a cross-section borehole positioning method based on central projection. By acquiring the 3D point cloud reconstruction mesh model of the cross-section and its projection pose parameters, the ray intersections and topological constraints are simultaneously calculated within a preset projection domain. An initial intersection set with occlusion determination and distortion ratio form a complete spatial mapping chain. An adaptive correction loop is constructed to relax the mesh protrusion occlusion and borehole spacing distortion in a linked manner, deriving the individualized optimal 3D borehole position distribution in reverse. This method breaks through the rigid limitations of traditional 2D templates, achieving accurate projection based on the true geometric shape of the cross-section, and providing a new high-fidelity pre-distortion guidance path for complex curved surface blasting operations.

The embodiment of the present application provides a kind of depth image processing method and equipment, the method includes obtaining the first depth image of first object;The depth value of pixel in the first depth image is corrected by field phase correction coefficient matrix to obtain second depth image, wherein, the field phase correction coefficient matrix is the matrix for correcting field phase error obtained after the preprocessing of n initial depth images, the n initial depth images are the depth image obtained in first condition, the first condition is the start time of the light source of shooting device and the start time of the sensor of the shooting device are different time, the preprocessing includes the mean processing made according to the n initial depth images, and n is the integer greater than 1.It can reduce the distortion rate of depth image by using the embodiment of the present application.

The invention belongs to the technical field of millimeter wave radar signal processing, discloses a close-range speckle noise elimination method for a side lamp type FOD detection radar, and aims to solve the problems that an existing algorithm is poor in environmental adaptability, insufficient in multipath interference suppression, unbalanced in target resolution and noise suppression and the like. Echo amplitude entropy, phase variance and environment sensor data dynamic adaptation parameters are fused, side lamp geometry prior modeling is utilized, multipath interference is pre-counteracted through an MMSE algorithm, differential multi-view processing is carried out on a clutter area and a target area, and the filtering intensity is dynamically adjusted based on phase continuity. Experimental verification shows that by means of the method, the close-range speckle noise power can be reduced by 20-24 dB, the detection rate of non-metal fragments with the size of 1 cm is increased to 95% from 62%, and the target edge distortion rate lt is increased; the environmental adaptability and the detection precision are remarkably improved, special hardware support is not needed, and the method can be directly deployed in an existing radar system and is suitable for high-safety-demand scenes such as airport runways.

The invention provides a material testing machine and a control method of the material testing machine. In the process of executing a material test, a user can master whether the shape of the output waveform is appropriate or not. A fatigue testing machine (1) that performs a fatigue test in which a test force (F) is applied to a test piece (TP) and mechanical characteristics of the test piece (TP) are measured, the fatigue testing machine (1) being provided with: a hydraulic actuator (18) that applies the test force (F) to the test piece (TP); a generation unit (511) that generates a sinusoidal input waveform (W1) indicating a test force target value (TF), which is a target value for the test force (F); a detection unit (513) that detects a test force (F) applied to the test piece (TP) by the hydraulic actuator (18); and a calculation unit (514) that, during the execution of the fatigue test, calculates a distortion rate (HD) of the output waveform (W2) indicating the detection result of the detection unit (513).

The invention provides a high-precision delta-sigma modulator based on time-sharing chopping. The high-precision delta-sigma modulator comprises a first-stage integrator, a second-stage integrator, a third-stage integrator, an adder, a comparator, two pairs of chopper circuits and an analog-to-digital converter, according to the invention, two pairs of chopper circuits are arranged, a time-sharing clock control technology is adopted, and a virtual device layout matching design is combined, so that accurate suppression of multi-source low-frequency interference is realized. The modulator adopts a three-order CIFF architecture, internal noise and imbalance of an operational amplifier are eliminated through a time-sharing controlled chopper 1, input charge injection, switching nonlinearity and DAC feedback errors are eliminated through a system-level chopper 2, and the stability of the sampling and integration process is ensured in cooperation with an optimized clock delay design. Under the sampling frequency of 1.024 MHz, the signal-to-noise distortion ratio reaches 106.7 dB, the noise suppression capability is improved by 68.1 dB, and the total power consumption is only 504 mu W.

An image processing apparatus includes a memory storing instructions, and a processor configured to execute the instructions to generate, using a first image obtained by imaging a three-dimensional space including an object through an optical system of a first projection method, a second image obtained by a second projection method different from the first projection method, and perform object detection using the second image. A distortion ratio on the second image satisfies a predetermined condition.

The embodiment of the invention provides a power transformation equipment defect identification method and system based on video stream analysis, and belongs to the technical field of power transformation equipment monitoring. The method comprises the following steps: acquiring an infrared image frame in a current video stream; determining the actual position of the power transformation equipment based on the infrared image frame; calculating a distortion ratio of the actual position; judging whether the distortion ratio is smaller than or equal to a preset distortion ratio threshold value or not; under the condition that it is judged that the distortion ratio is larger than the distortion ratio threshold value, the intersection-union ratio of the actual position and the default anchoring frame position is calculated; judging whether the intersection-union ratio is smaller than a preset threshold value or not; under the condition that the intersection-to-union ratio is smaller than the threshold value, adjusting the angle of the current camera, and returning to execute the step of obtaining the infrared image frame in the current video stream; and under the condition that the intersection-to-union ratio is judged to be greater than or equal to the threshold value, performing defect identification operation based on the infrared image frame and the visible light image.

Given a sequence of images in a first keyword representation, methods, processes, and systems are presented for image reconfiguration using distortion-rate optimization, where reconfiguration allows the images to be encoded in a second keyword representation that enables more efficient compression than using the first keyword representation. Syntax methods for signaling reconfiguration parameters are also presented.

This invention provides an analog joint coding modulation method, apparatus, and device based on amplitude probability shaping. By deeply coupling S-K mapping coding with multi-ring constellation modulation based on amplitude probability shaping, a modulation architecture combining geometric shaping and probability shaping is constructed. The radius of each ring in the constellation diagram is jointly determined by the amplitude scaling factor and the cumulative probability. A uniform phase offset is introduced between adjacent rings to optimize the geometric layout. Then, through joint iterative optimization of S-K mapping coding parameters and constellation amplitude and phase parameters, the signal distortion ratio is maximized. Thus, without increasing system complexity, a single modulation architecture can achieve collaborative adaptive optimization of coding and modulation, significantly improving the end-to-end transmission performance of the system.

The application discloses a target speaker extraction method and system based on a multi-scale multi-modal alignment network, and relates to the technical field of target speaker extraction. The application constructs a multi-scale multi-modal alignment network to perform target speaker extraction. On one hand, the multi-scale multi-modal alignment network acquires speech embedding of different time scales through multi-scale coding and extracts more abundant speech embedding through multi-direction deep coding. On the other hand, the multi-scale multi-modal alignment network introduces a modal alignment unit based on contrast learning, minimizes the distance between electroencephalogram features and speech embedding at the same time step during network training, and constructs a noise contrast estimation loss to form a scale-invariant signal distortion ratio loss used by the entire network together with a scale-invariant signal distortion ratio loss formed based on the output of a speech decoding unit. The multi-scale multi-modal alignment network not only realizes alignment of cross-modal data and reduces the difficulty of multi-modal fusion, but also realizes adjustment of overall parameters of the network, thereby guaranteeing and improving the overall performance of the network in target speaker extraction.

A multi-channel analog-digital converter (ADC) subsystem for test device such as a spectrum analyzer may include multiple multi-channel ADCs to receive down-converted signals and convert the received signals to digital output signals, a field programmable gate array (FPGA) to select one or more ADCs based on a frequency, a bandwidth, and / or a signal type of each received signal and a characteristic of each ADC, and an ADC sample clock to provide a clock signal to the selected ADCs. Characteristics of the ADCs may include a resolution, a signal-to-noise-and-distortion ratio (SINAD), an effective number of bits (ENOB), a signal-to-noise ratio (SNR), a total harmonic distortion (THD), a total harmonic distortion plus noise (THD+N), and / or a spurious free dynamic range (SFDR).

To provide a multiple perspectives signal codec which enables a higher compression rate or a better rate / distortion ratio.SOLUTION: The encoder 20 achieves a higher compression rate or a better rate / distortion ratio by adopting or predicting the second encoding parameters to be used for encoding the second view 122 of the multiple perspectives signal from the first encoding parameters 461, 481, 501 used when encoding the first view 121 of the multiple perspectives signal 10. The redundancy between the viewpoints of the multiple perspectives signal is not limited to the viewpoints themselves such as the video information of these viewpoints, but is a point that the coding parameters when coding these viewpoints in parallel also indicate similarity, and if this point is used, the coding rate can be further improved.SELECTED DRAWING: Figure 1

The present disclosure relates to a kind of vehicle-mounted LED backlight and control method, which comprises: determining target ambient light intensity according to light intensity, determining the distortion ratio of display image according to the product between driving speed and target ambient light intensity, determining minimum clamping gray value and maximum clamping gray value according to distortion ratio and the initial gray value corresponding to each pixel point, generate the clamping gray value of first target pixel point, the gray value distribution of image is extended to preset gray range by linear mapping, determine the extension gray value of each pixel point in image, calculate the ratio between the initial gray value of each pixel point and the extension gray value corresponding to each pixel point, the product of the initial LED backlight brightness of each pixel point corresponding ratio and the value after weighted summation is used as target LED backlight brightness. To reduce the backlight brightness of LED backlight, achieve the technical effect of high efficiency and energy saving of vehicle-mounted display screen.

The invention discloses an audio transmission system based on a high-precision photoelectric sensor, and relates to the technical field of photoacoustic signal conversion, and the system comprises a laser emission module, an optical cable, a photoelectric sensor and a signal reconstruction module. The laser emission module is connected with the decoding unit, and the laser emission module is used for converting a first audio signal generated by the decoding unit into an optical signal; the photoelectric sensor is connected with the laser emission module through an optical cable and is used for converting an optical signal into a current signal; and the signal reconstruction module is connected with the photoelectric sensor and the playing unit, and the signal reconstruction module is used for performing audio signal reconstruction based on the current signal to obtain a second audio signal and transmitting the second audio signal to the playing unit. According to the invention, signal distortion and electromagnetic interference in the long-distance transmission process of the audio signal are effectively suppressed, the audio transmission efficiency and transmission quality are improved, and the distortion rate is reduced.

The present application belongs to the technical field of energy operation safety management, and provides a kind of safety management and early warning system of energy operation site, comprising: the historical temperature-distortion rate of frequency is calculated by sensor acquisition frequency and monitoring system receives frequency, temperature range-distortion rate range set is obtained by clustering, correlation is analyzed based on pearson correlation coefficient method, linear or nonlinear influence model is constructed, the distortion rate range corresponding to current temperature is output and stability is judged by fluctuation variance, whether it causes vacuum under stable state is judged and is compensated by increasing acquisition frequency, sensor failure is judged using LSTM time series prediction model under unstable state;The present application does not need to add hardware, adapts to multiple energy operation scenarios, and guarantees monitoring continuity and reliability.

The embodiment of the invention discloses a microphone output critical value measuring method and system, and belongs to the technical field of microphone testing. The method comprises free field sensitivity test and maximum sound pressure level conversion, and the free field sensitivity of a moving coil microphone / sound head to be tested is tested according to a standard method; inputting a tested stepping amplitude voltage signal to the moving coil microphone / sound head to be tested through a signal generator, and recording and collecting the output response of the standard measurement microphone; distortion rate calculation and judgment are carried out through the audio signal analyzer, and finally conversion of the maximum sound pressure level is carried out. According to the method, near-field test conditions are adopted, high-signal-to-noise-ratio sound pressure signal collection is achieved, meanwhile, the harmonic distortion rate is accurately calculated through the signal processing technology, it is ensured that data are accurately recorded when the specified distortion rate is reached, and the reliability of a test result is improved.