74 results about "Modulation function" patented technology

The invention discloses a power grid power load intelligent prediction method, system and device and a medium, and relates to the technical field of power distribution network transmission optimization. Power load data is decomposed into a trend component, a periodic component and a random fluctuation component, and then the importance of different components is evaluated by using a feature channel attention layer; the time sequence attention layer captures key moments in each component time sequence and extracts features at the key moments, and then the features extracted based on the importance and the features extracted at the key moments are fused, so that the multi-scale features of the power load are captured; and then inputting the fused features into the dynamic gating residual connection LSTM network for prediction, and in the prediction process, improving the attention degrees of long-term sequences, short-term sequences and fluctuation sequences in different features through a residual modulation function, thereby more accurately capturing the multi-scale features of the power load and obtaining a prediction value of the power load.

The invention discloses an acoustic excitation digital modulation noise reduction method and system for laser acoustic vibration detection and application. Comprising the following steps: step 1, acquiring single-point measurement time sequence parameters of laser vibration measurement equipment, step 2, measuring response characteristics of an audio excitation device, and determining pre-stabilization time required by an audio excitation signal from starting to reaching a stable amplitude; step 3, constructing an on-off keying modulation function, generating a digital gating function according to the time sequence parameter and the pre-stabilization time, and performing time domain multiplication on the audio excitation signal and the digital gating function to generate a modulated intermittent audio excitation signal; and 4, controlling the audio excitation device to play intermittent audio excitation signals, and synchronously triggering the laser vibration measurement equipment to scan and collect the measurement points on the surface of the object to be measured according to the time sequence parameters. Through the on-off keying digital modulation technology, audio excitation can be started only in the effective detection time period of laser vibration measurement, and therefore the average noise level and equipment power consumption are remarkably reduced.

The invention provides an engineering construction monitoring method and system based on multi-source data fusion, and relates to the technical field of engineering construction monitoring. Structural vibration, wind power and multi-dimensional environment data are fused, a wind load modulation function and an environment correction model are constructed, the influence of a wind load nonlinear amplification effect and environment disturbance on vibration signals is effectively eliminated, and the accuracy of the vibration signals is improved. The accuracy and sensitivity of damage feature extraction are improved; meanwhile, in combination with a signal decomposition technology and multi-layer Bayesian reasoning, probabilistic evaluation and real-time risk early warning of the structural damage state are realized, the response capability and the discrimination capability of the monitoring system to structural state changes under complex working conditions are enhanced, and the precision and the reliability of health monitoring of the engineering building structure are improved.

The invention discloses a system and method for generating, regulating and controlling a partially coherent space-time light field. The system comprises a pulse shaping assembly composed of a plurality of optical elements and an incident light source used for providing a completely coherent ultrafast pulse light field. An optical element in the pulse shaping assembly comprises a first blazed grating, a first cylindrical lens, a two-dimensional dynamic holographic modulator, a second cylindrical lens and a second blazed grating which are sequentially arranged in the light field propagation direction. The focal lengths of the first cylindrical lens and the second cylindrical lens are the same, and the distance between the adjacent optical elements is equal to the focal lengths of the first cylindrical lens and the second cylindrical lens; the two-dimensional dynamic holographic modulator is used for loading a specific complex amplitude modulation function to reconstruct the spatial-spectral characteristics of the light field. According to the invention, the two-dimensional space-spectrum function of the pulse is dynamically modulated, the generation of the partially coherent space-time wave packet is realized, and the amplitude and structure distribution of the space-time coherence can be designed and regulated as required.

The invention belongs to the technical field of time modulation arrays, and relates to a direction and polarization joint estimation method based on a time modulation array, which comprises the following steps: establishing an alternating polarization time modulation array, obtaining a receiving signal of each array element, a time modulation function and a polarization vector of each array element, and further obtaining an actual receiving signal of each array element, establishing a linear relation among a harmonic component, a polarization parameter and an incident direction of a received signal of each sub-array; according to the linear relation, the relation between direction disturbance and direction function disturbance is obtained, a vector formed by subarray harmonic components is rewritten into a form containing a noise item, error disturbance between a truth value of a direction function and a corresponding estimator is obtained, and then a direction estimation value is obtained; according to the linear relation, the relation between the polarization matching coefficient of the array manifold vector estimation value and antenna polarization and radiation source polarization is obtained, and then the polarization estimation value is obtained. According to the invention, joint estimation of direction and polarization can be realized.

The application provides a phase optical element and a method for obtaining stable transmission of light intensity of non-diffraction light beams. The phase optical element having an equivalent light field modulation function to the amplitude optical element is used to replace the amplitude optical element, so that the light intensity distribution of the non-diffraction light beams is obtained. Compared with the amplitude optical element, the phase optical element has the advantages of small energy loss, low cost, easy processing and the like, and is suitable for more extensive practical applications.

The present invention discloses an intermittent sampling interference method and system based on pseudo-random sequence frequency shift modulation, which relates to the technical field of radar electronic countermeasures, including intermittent sampling of enemy radar signals to obtain intermittent sampling signals; setting a pseudo-random sequence and a frequency shift amount, constructing a frequency shift amount function and a frequency shift modulation function; using the frequency shift modulation function to modulate and forward the intermittent sampling signal to obtain a frequency shift modulation interference signal; then performing matched filtering processing, parsing the filtered interference signal to obtain an optimal frequency shift amount matrix; substituting the optimal frequency shift amount matrix into the filtered interference signal to obtain an optimal interference signal, and implementing interference on the enemy radar. The present invention causes false targets to randomly superimpose around the real target, forming strong false targets with random distributions of leading, nearby, and lagging; not only adjusting the amplitude and position distribution of the strong false targets, but also destroying the time-frequency distribution and spatial distribution characteristics of the intermittent sampling interference, having both suppression and deception interference effects.

An optical multiplexer includes: an coupled MMI optical multiplexing part formed by coupling, from an input side, a first MMI optical multiplexing part and a second MMI optical multiplexing part having a width narrower than the first MMI optical multiplexing part; two optical input side optical waveguides connected to the first MMI optical multiplexing part; and a single optical output side optical waveguide connected to the second MMI optical multiplexing part, wherein one light input side optical waveguide is a two-color propagation light input side optical waveguide for propagating a combined laser light composed of two laser lights having different wavelengths, and the other is a one-color propagation light input side optical waveguide for propagating one laser light having a wavelength different from the two laser lights, and the second MMI optical multiplexing part is disposed on an extension of the one-color propagation light input side optical waveguide.

The invention provides an optical multiplexer, an optical multiplexing member, an optical multiplexing member with an optical modulation function, a visible light source module, an optical engine, and XR glasses which can be reduced in size and reduced in optical loss compared with the prior art. An optical multiplexer (100) is provided with: an MMI-coupled optical multiplexer unit (50) in which a first MMI-type optical multiplexer unit and a second MMI-type optical multiplexer unit having a narrower width than the first MMI-type optical multiplexer unit are coupled; two optical input-side optical waveguides connected to the first MMI-type optical multiplexer unit; and one optical output-side optical waveguide connected to the second MMI-type optical multiplexer unit. One optical input side optical waveguide is a two-color propagation optical input side optical waveguide for propagating a combined laser beam comprising two laser beams having different wavelengths, and the other optical input side optical waveguide is a single-color propagation optical input side optical waveguide for propagating one laser beam having a wavelength different from that of the two different laser beams. The second MMI-type optical multiplexer is disposed on an extension line of the monochromatic propagation light input-side optical waveguide.

Methods, systems, and computer-implementable algorithms for determining time-varying pulses for a patient with an implantable stimulator device (ISD) are disclosed. At least one time-invariant tonic stimulation pulse parameter (e.g., amplitude, pulse width, or frequency) is modified by a modulation function to produce a time-varying pulse (TVP), and one or more measurements are made to determine the effectiveness of the TVP. The measurements can be objective and taken from the patient, and / or subjective and determined based on feedback from the patient. In one example, the objective measurements can include one or more features determined from an epidural spinal cord electrogram (ESG) signal detected by the ISD, which can include an evoked compound action potential. The one or more measurements are used to determine a score for the TVP, which is useful in selecting the best TVP for use with the patient, or for adjusting the modulation function applied to the tonic stimulation parameters.

The invention provides a design method of a dual-beam time modulator. The method comprises the following steps: expanding a time modulation function into Fourier series; keeping the amplitude weighted value of the target sideband consistent, and setting the amplitude weighted values of the other sidebands as 0; setting the initial phase of the target sideband as a certain value, and setting the initial phases of the other sidebands as 0; a + 1 secondary sideband and a-1 secondary sideband are selected as target sidebands, the initial phase of the + 1 secondary sideband is independently controllable, the amplitudes of the + 1 secondary sideband and the-1 secondary sideband are set to be 1, the initial phases are set to be delta phi and 0 respectively, and a dual-beam time modulation function with the adjustable initial phases is constructed; a programmable time modulator architecture is utilized to realize a dual-beam time modulation function with an adjustable initial phase.

The invention relates to a method configured for computing, by computer, data of an ophthalmic lens for manufacturing the ophthalmic lens using the data, the method comprising a step of generating data of a random modulation surface of the ophthalmic lens, and the method is characterized in that the data of the random modulation surface results from applying a continuous random surface modulation function or a scaled continuous random surface modulation function to a predefined surface of the ophthalmic lens.

The application discloses a spatial light modulator control method, a spatial light modulator and a control system, and relates to the technical field of spatial light modulator development and application. The method comprises the following steps: after obtaining addressing data and control data of a spatial light modulator, the addressing data and the control data are fused and encoded on resolution indication bits and bit depth indication bits in an addressing data format to obtain a video signal to be transmitted; then the video signal is transmitted to the spatial light modulator through a video signal transmission channel; the spatial light modulator parses the addressing data and the control data from the video signal; the corresponding light wave modulation function is completed according to the addressing data; and the corresponding control function is completed according to the control data. Thus, the interface requirement of an upper computer can be reduced, the purpose of transmitting signals by using the same interface and time sequence is achieved, the synchronous precision is high, the user operation is easy, and the method is convenient for practical application.

Evaluation and adjustment of time-varying pulse patterns in spinal cord stimulator systems are disclosed. Methods, systems, and computer-implemented algorithms are disclosed for determining time-varying pulses for a patient having an implantable stimulator device (ISD). At least one time-invariant stimuli pulse parameter (e.g., amplitude, pulse width, or frequency) is modified by a modulation function to produce a time-varying pulse (TVP), and one or more measurements are made to determine the effectiveness of the TVP. The measurements may be objective and taken from the patient, and / or subjective and determined based on feedback from the patient. In one example, the objective measurements may include one or more features determined from electrospinal cord (ESG) signals detected by the ISD, which may include evoked composite action potentials. One or more measurements are used to determine a score of TVP, which is useful in selecting an optimal TVP for use with a patient, or in adjusting a modulation function applied to an ankylosing stimulation parameter.

The invention relates to an OFDM (Orthogonal Frequency Division Multiplexing) general inductance integrated waveform optimization method and device and a medium, and the method comprises the steps: carrying out the optimization processing of information bits through employing an optimization algorithm, and generating reserved bits; deploying OFDM subcarriers by adopting a fragmentation and layering mode based on the reserved bits and the information bits, and coding each layer of bit plane to obtain a coded bit sequence; modulating the coded bit sequence of each layer of bit plane through a preset modulation function; and synthesizing the modulated bit sequence to generate an OFDM (Orthogonal Frequency Division Multiplexing) general inductance integrated waveform. According to the method, the peak-to-average ratio (PAPR) and the sidelobe ratio (PSLR) are suppressed, and meanwhile, the radar receiving end can correctly reconstruct the reference signal through a decoding technology.

The application discloses a current measurement method based on an optical fiber current sensor and belongs to the field of optical fiber sensing. The period of a basic digital square wave is composed of a current signal collection period and a vibration signal collection period, and the size is related to the round-trip time of the modulated light. The current phase shift and the vibration phase shift are collected in the two collection periods respectively, the first digital step wave and the second digital step wave are obtained according to the two phase shifts, the total phase of the optical fiber current sensor is kept at the sensitive point of pi / 2 in the current signal collection period through the reset and closed-loop modulation functions, the total phase of the optical fiber current sensor is kept at the insensitive point of 0 in the vibration signal collection period, the current signal and the vibration signal are obtained, the time of vibration occurrence is determined through the vibration signal, and the vibration filtering is performed on the current signal. The method can improve the measurement precision and stability and avoid the occurrence of false locking accidents.

The present invention provides a method for calculating an optical modulation transfer function based on a knife-edge image, comprising the following steps: using an optical modulation function measurement device to collect a knife-edge image and converting the knife-edge image into a grayscale image; calculating the knife-edge rising edge width of the grayscale image; performing a convolution operation on the grayscale image using a differential template matrix to obtain an LSF image; identifying the edge coordinates of the LSF image, and then rotating the LSF image using an affine transformation; and then performing a discrete Fourier transform to obtain an optical modulation transfer function curve. The optical modulation transfer function calculation method provided by the present invention calculates the average value of the rising edge pixel width of each row to obtain a corresponding adaptive differential convolution template, then convolves the knife-edge image to obtain a line spread function (LSF) image, and finally obtains an optical transfer function curve through a discrete Fourier transform. Because the differential method of this method relies on an adaptive differential template to perform convolution, it effectively removes noise.

To provide an optical multiplexer which is connectable to or can be integrated with an optical modulator using a lithium niobate film, and which can be more downsized than before.SOLUTION: An optical multiplexer 100 according to the present invention multiplexes a plurality of laser beams differing in wavelength, and comprises an optical multiplexing unit 50, a plurality of optical input-side optical waveguides 21-1, 21-2, 21-3 connecting thereto, and one optical output-side optical waveguide 22T connecting to the optical multiplexing unit 50, with the optical multiplexing unit 50 composed of one stage or multiple stages of MMI-type optical multiplexing units. The optical input-side optical waveguides 21-1, 21-2, 21-3 have a trapezoidal cross section, and the optical multiplexing unit 50 and the optical output-side optical waveguide 22T have a trapezoidal or a rectangular cross section. The lower side internal angles α21, α22 of the trapezoidal or a rectangular cross section of the optical multiplexing unit 50 and the optical output-side optical waveguide 22T are larger than at least one of the two lower side internal angles α11, α12 of the trapezoidal cross section of the optical input-side optical waveguides 21-1, 21-2, 21-3.SELECTED DRAWING: Figure 1

A polishing method includes: holding a substrate against the polishing surface of a polishing pad using a carrier head; generating relative movement between the substrate and the polishing pad; applying a first pressure modulated by a first modulation function to a first region of the substrate; applying a second pressure modulated by a second modulation function orthogonal to the first modulation function to a second region of the substrate; monitoring the substrate with an in-situ friction monitoring system to generate a sequence of measurements during the polishing of the substrate; and determining the relative contribution of the first region and the second region to the sequence of measurements based on distinguishing between a first frequency and a second frequency.

The application belongs to the technical field of time modulation array, and relates to a direction and polarization joint estimation method based on a time modulation array, which comprises the following steps: establishing an alternating polarization time modulation array, obtaining the received signal of each array element, a time modulation function and the polarization vector of each array element, then obtaining the actual received signal of each array element, and establishing a linear relationship among the harmonic component of each subarray received signal, a polarization parameter and an incident direction; according to the linear relationship, obtaining the relationship between the direction disturbance and the direction function disturbance, rewriting the vector formed by the subarray harmonic component into a form containing a noise term, obtaining the error disturbance between the true value of the direction function and the corresponding estimation quantity, and then obtaining the estimation value of the direction; according to the linear relationship, obtaining the relationship between the polarization matching coefficient of the array manifold vector estimation value and the antenna polarization and the polarization of the radiation source, and then obtaining the estimation value of the polarization. The application can realize joint estimation of the direction and the polarization.

The present application relates to a kind of microlens array refractive power distribution modulation method, application, verification method and vision correction element, comprising the following steps: constructing space weight modulation function to the refractive power of each microlens is dynamically modulated, the refractive power of each microlens from center to edge smooth transition, adjacent microlens curvature is continuous, adjacent microlens has continuous curved surface / step surface and refractive power at boundary;Wherein, the curved surface / step surface position between adjacent microlenses, curved surface / step surface slope and curved surface / step surface curvature smooth connection.The modulation method of the present application is dynamically modulated to the refractive power of each microlens, the refractive power of each lens in microlens array from center to edge smooth transition, and through single parameter adaptation different refractive power demand, user no longer perceives the sudden change of correction degree when scanning across lens boundary, and viewing experience is uniform and comfortable, belong to optical element design technical field.

An optical coupler of the present disclosure couples laser light beams with a plurality of different wavelengths, and includes an MMI connected optical coupling unit formed by connecting a first MMI type optical coupling element that shifts an incidence position and a second MMI type optical coupling element having a width wider than the width of the first MMI type optical coupling element, one or more first light input side optical waveguides that are connected to the first MMI type optical coupling element, one or more second light input side optical waveguides that are connected to the second MMI type optical coupling element and one light output side optical waveguide that is connected to the second MMI type optical coupling element.

The invention relates to a method and system for treating an area with radio frequency radiation with a resonant frequency and modulation function calibrated to destroy harmful pathogens, such as bacteria, viruses or other germs. According to the present invention, transmitters are used to neutralize harmful pathogens within a space, and may be used with corresponding receivers are used to verify the functional performance of the transmitters, and to create a data stream so that human occupants of the spaces so being treated can be assured that the areas they occupy have been so treated.

An image processing method includes the following operations. An environmental image is captured by a web camera. And the web camera calculates an automatic photographing parameter according to the environment image, wherein the automatic photographing parameter comprises an automatic white balance parameter, an automatic exposure parameter or an automatic focusing parameter. And the automatic photographing parameters are transmitted to a controller chip of the display by the network camera. And the controller chip executes a modulation function according to the automatic photographing parameters so as to adjust a display picture of the display.

To provide an optical multiplexer that can be reduced in size and has reduced optical loss compared to before.SOLUTION: An optical multiplexer 100 shown in a figure 1 comprises: an MMI coupled-type optical multiplexing part 50 obtained by coupling a first MMI-type optical multiplexing part 50-1 and a second MMI-type optical multiplexing part 50-2 having a narrower width than the width of the first MMI-type optical multiplexing part 50-1; two optical input-side optical waveguides 21-1, 21-2 connected to the first MMI-type optical multiplexing part 50-1; and one optical output-side optical waveguide 22 connected to the second MMI-type optical multiplexing part 50-2. One optical input-side optical waveguide is the optical input-side optical waveguide 21-1 for two-color propagation through which a multiplexed laser beam comprising two laser beams with different wavelengths propagates, and the other optical input-side optical waveguide is the optical input-side optical waveguide 21-2 for one-color propagation through which one laser beam with a different wavelength from those of the different two laser beams propagates. The second MMI-type optical multiplexing part 50-2 is arranged on an extension line of the optical input-side optical waveguide 21-2 for one-color propagation.SELECTED DRAWING: Figure 1

The application discloses a data-driven TOF depth imaging method capable of removing multipath error. The steps are as follows: three-dimensional modeling is carried out for a scene with multipath effect, depth rendering is carried out on the scene to obtain a depth map label and corresponding scene parameters; the scene is described in the form of a triangular mesh, transient rendering based on pbrt is carried out to obtain a pulse response transient map; a learnable modulation function is convolved with the pulse response transient to obtain echo after the modulation function illuminates the scene; a learnable TOF demodulation function is used, multiplied with the output of the previous step, integrated and added with ambient light and noise, and input into a reconstruction subnetwork; the network is trained, a modulation function is obtained, laser is modulated, the scene is illuminated, echo is measured by a photodetector, multiplied with the obtained demodulation function and filtered; and a voltage value is input into the trained reconstruction subnetwork to obtain a depth map. The method enhances the robustness of TOF depth imaging to multipath error and improves imaging accuracy.

The present disclosure relates to a gastroscopic image analysis method using image segmentation technology, and a computer system. The method comprises: segmenting a gastroscopic image into a plurality of blocks; inputting the blocks into an encoder to obtain an encoded feature map; inputting the encoded feature map into a decoder to obtain a decoded feature map; and inputting the decoded feature map into a masked focus modulation decoder, wherein the masked focus modulation decoder is used for inputting a first template feature into a focus modulation function to obtain a focus modulation feature, inputting the decoded feature map into a scaling function and then substituting the decoded feature map into a projection function to obtain a scaled feature, and generating a second template feature on the basis of a mask, the scaled feature and the focus modulation feature; and on the basis of the second template feature, generating a prediction mask, which is used for segmenting a gastric intestinal metaplasia region. In the present disclosure, a gastroscopic image is analyzed by means of image segmentation technology, thereby achieving the effect of segmenting a gastric intestinal metaplasia region in the gastroscopic image.

The invention relates to the technical field of seismology, and provides a near fault pulse type seismic motion synthesis method considering seismic source characteristics, which comprises the following steps: 1) obtaining seismic motion horizontal component coherence coefficients among field points; 2) constructing a power spectrum matrix between field points; 3) decomposing the power spectrum matrix, calculating to obtain an amplitude and a phase angle, and synthesizing a stable seismic oscillation time history by adopting a trigonometric series method; 4) synthesizing stationary seismic oscillation by using a non-stationary modulation function; 5) predicting pulse occurrence probabilities corresponding to parallel and vertical fault components at the design position of the near fault region; 6) calculating to obtain a pulse period, a pulse amplitude, a pulse shape parameter, a pulse phase angle and a pulse peak arrival time corresponding to the horizontal component, and synthesizing a low-frequency velocity pulse time history of the horizontal component; and 7) superposing the synthesized non-stationary seismic oscillation time history corresponding to the same horizontal component and the equivalent velocity pulse on the time history. The method can better perform seismic oscillation synthesis.

The invention discloses a design method of a lithium niobate film phase modulator with a high polarization extinction ratio, and belongs to the field of integrated optical gyroscopes. The method comprises the following steps: firstly, designing a lithium niobate film phase modulator comprising a silicon substrate, a silicon dioxide cladding, a lithium niobate film optical waveguide core layer and a modulation electrode; the double-layer conical gradient waveguide meeting the TE mode light fundamental mode transmission condition couples light into a chip, and polarization of a transmittable light mode is limited by designing the width and the thickness of the waveguide; the effective refractive index, the bending radius, the waveguide width and the center distance are designed for the directional coupling unit, and polarization is generated through phase matching polarization beam splitting; the multimode interference coupler is polarized by designing the length and width of a multimode interference region; the bending beam splitting unit is polarized by designing bending radius leakage; finally, through an electric field generated by a modulation electrode, the light is subjected to phase change, and two beams of light with phase difference are output; according to the invention, a high polarization extinction ratio is realized on the basis of a basic beam splitting modulation function.

This invention relates to a video classification method based on Mamba Networks for adaptive adjustment of the image base model. By combining the state-space model of the Mamba Network with the image base model, efficient extraction and adaptive adjustment of spatiotemporal features in video data are achieved, thereby improving the accuracy and computational efficiency of the video recognition system. The main steps include: preprocessing the input video into a long sequence of video features; grouping the long sequence of video features using window partitioning and calculating autocorrelation features within each group; processing the long sequence of video features using the Mamba Network and adjusting them through a modulation function; feeding the modulated features into subsequent layers of the image base model for forward propagation; and classifying the video using a classifier. This invention provides a novel video recognition framework that can improve video recognition performance without changing the structure of the base model, through the adjustment mechanism of the Mamba Network.