20 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 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 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.

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 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.

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.

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.

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 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 invention discloses a transformer substation noise intelligent separation method and device, equipment and a medium, and relates to the field of audio processing, and the method comprises the steps: collecting equipment noise generated when a plurality of target equipment works, carrying out the preprocessing of the equipment noise, and constructing a target mixed noise data set based on the obtained preprocessed noise data; mixing the original audio signals, decomposing the obtained mixed audio signals to obtain decomposed audio signals, and constructing a signal distortion ratio and a scale-invariant signal distortion ratio through the original audio signals, the decomposed audio signals and the mixed audio signals; and optimizing a preset multi-channel speech enhancement model through the distortion ratio and the target mixed noise data set, and performing noise separation on the to-be-processed noise data based on the obtained target multi-channel speech enhancement model to obtain a separated noise signal and a separated audio signal. Therefore, the noise signal can be processed through the multi-channel speech enhancement model, and the noise separation effect is further improved.

This application provides a method for improving headphone audio experience and device battery life, comprising: acquiring high-frequency energy loss data from the headphone amplifier circuit, comparing it with a preset threshold, and determining whether material parameters need to be optimized; performing performance simulation on core circuit components based on the comparison result to determine the optimized material parameter configuration; acquiring circuit dynamic response data based on the material parameter configuration, analyzing fluctuation characteristics, and determining a response speed improvement scheme; adjusting high-frequency performance test signals based on the circuit stability enhancement model to determine a structural design correction path; acquiring audio purity sampling data through the structural design correction path, determining the distortion ratio, and obtaining sound quality improvement verification results; processing battery life simulation input based on the sound quality improvement verification results to determine a power consumption reduction configuration; and acquiring overall audio experience feedback through the power consumption reduction configuration, determining a balance index, and determining the final circuit deployment scheme.

To reduce the distortion rate of the input current. [Solution] The power conversion device includes a control unit. The control unit includes a feedforward unit 60 that derives the duty cycles of the upper arm switching element and the lower arm switching element by feedforward control of the input voltage and output voltage command value, a comparator 75 that outputs a PWM signal based on the duty cycle derived by the feedforward unit 60, a determination unit 58 that outputs a high-level or low-level output signal depending on whether the input voltage is positive or negative, and a logic circuit 80 that outputs control signals to control the upper arm switching element and the lower arm switching element based on the PWM signal and the output signal.

This application relates to a wave element correction method, comprising the following steps: binarizing a wave image and a grid image to obtain wave lines and grid lines; removing abnormal data at grid line intersections based on the changes in pixel data across multiple width ranges along the length of each line within the grid; obtaining corrected grid lines based on the coordinates of the two endpoints along the width of each line within the grid; acquiring the rate of change in the number of pixels on either side of the grid where the wave height or wavelength is located, and combining this with the position of the wave height or wavelength within the grid and the number of pixels it occupies to obtain the wave height and wavelength data. The above wave element correction method, by combining the rate of change of the wave height or wavelength on either side of the grid, obtains the distortion ratio of both sides of the grid; by using the number of pixels separated from one side of the grid, it obtains the pixel change at the grid position where the wave height or wavelength is located; and by combining this change with the number of pixels and the number of grids, it obtains the actual data. The data calculation is accurate and fast.

The application discloses a music rhythm-somatic rhythm synchronous control method and system based on mechanical resonance avoidance, and the method comprises the following steps: obtaining the inherent resonance frequency, quality factor and resonance bandwidth of an electromagnetic actuator-seat coupling system; collecting an audio signal and extracting a beat frequency, which is converted into a target driving frequency; calculating the frequency distance ratio between the target driving frequency and the inherent resonance frequency; when the frequency distance ratio is less than a resonance danger threshold, performing frequency offset on the target driving frequency and compensating the amplitude-frequency response attenuation at the offset frequency through an amplitude compensation formula. Through the cooperative strategy of frequency offset and amplitude compensation, the application can maintain the perceptual consistency of the rhythm intensity while avoiding mechanical resonance, reduce the resonance zone amplitude amplification multiple, and reduce the rhythm distortion rate.

Provided is, inter alia, a signal processing device that performs reference channel selection or sensor subset selection based on SDR. A signal processing device selects at least one of a sensor subset and a reference channel on the basis of maximization of a value that corresponds to a signal-to-distortion ratio of an output signal in beamforming.

The invention belongs to the technical field of energy operation safety management, and provides a safety management and early warning system for an energy operation site, which comprises the following steps of: calculating a historical temperature-monitoring distortion rate through a sensor acquisition frequency and a monitoring system receiving frequency, clustering to obtain a temperature range-distortion rate range set, analyzing relevance based on a Pearson's correlation coefficient method, constructing a linear or nonlinear influence model, outputting a distortion rate range corresponding to the current temperature, judging stability through fluctuation variance, judging whether vacuum is caused or not in a stable state, improving acquisition frequency compensation, and judging a sensor fault by utilizing an LSTM (Long Short Term Memory) time sequence prediction model in an unstable state; according to the invention, hardware does not need to be added, multi-energy operation scenes are adapted, and monitoring continuity and reliability are guaranteed.