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55 results about "Linear term" patented technology
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A linear term is a term with a degree of 1, or simply x. In this example, 2x 2 is a quadratic term because the x has a degree of 2, and the 5 is just a constant.
Method, apparatus, and computer-readable medium for pre-reconstruction decomposition and calibration in dual energy computed tomography
ActiveUS20090262997A1Easy to handleReconstruction from projectionMaterial analysis using wave/particle radiationDecompositionDual energy
A method of obtaining a computed tomography image of an object includes determining linear terms and non-linear beam hardening terms in a pair of line integral equations for dual-energy projection data from inserting average and difference from average attenuation terms, obtaining an initial solution of the line integral equation by setting the non-linear beam hardening terms to zero, and iteratively solving the line integral equations to obtain one line integral equations for each basis material. Attenuation by the first basis material corresponds to a photoelectric attenuation process, and attenuation by the second basis material corresponds to a Compton attenuation process. The line integral equations can be inverted by an inverse Radon procedure such as filtered backprojection to give images of each basis material. The images of each basis material can then be optionally combined to give monochromatic images, density and effective atomic number images, or photoelectric and Compton processes images.
Owner:TOSHIBA MEDICAL SYST CORP
Connection admission control based on bandwidth and buffer usage
A connection admission control (CAC) technique for a telecommunications node approximates probability of loss using a log moment generating function and its two partial derivatives of workload on a queue over a time interval. The approximation uses four state variables, which depend on the log moment generating function and its two partial derivatives. The four state variables are: (1) Linear term in approximation to log loss ratio at a working point; (2) the argument of logarithmic term in approximation to log loss ratio at the working point; (3) a buffer limit used at the working point; and (4) a multiplier of imaginary traffic used at the working point. Advantageously, these state variables vary linearly with the traffic, so a new connection can simply add its contributions to them. The connection admission control (CAC) uses the state variables to produce the following three parameters: (1) an approximation q=z-log(c) to the logarithm of the probability of loss; (2) a buffer size limit B; and (3) a multiple m of imaginary traffic from a design mix. The traffic on all connections is admissable if four conditions are satisfied. The present invention applies, e.g., to a single queue and server, and can be generalized to multiple queues and servers.
Owner:TELEFON AB LM ERICSSON (PUBL)
Image reconstruction
InactiveUS20120155730A1Efficient solutionMagnetic measurementsCharacter and pattern recognitionResonanceMri image
A system and method of reconstructing an image through solution of a data fitting problem, wherein the data fitting problem is not susceptible to efficient solution as a whole, is disclosed, which may comprise gathering, via a computing device, k-space image data, selecting a data fitting problem solution algorithm for the k-space data, decomposing the data fitting problem solution into a plurality of sub-problem solutions each susceptible to efficient solution separately for the k-space data, obtaining, via the computing device, the plurality of sub-problem solutions for the k-space data, and reconstructing, via the computing device, the image based upon a weighted average of the plurality of sub-problem solutions for the k-space data. The image may be a magnetic resonance image. The data fitting problem may comprise a minimization of a plurality of linear terms of a least square data fitting solution. The image may comprise under-sampled k-space image data.
Owner:RUTGERS THE STATE UNIV
System and method for luminance degradation reduction using thermal feedback
InactiveUS20050248517A1Decrease in display luminanceStatic indicating devicesElectroluminescent light sourcesElectricityDisplay device
A system to compensate for luminance degradation of an emissive display is provided. As its primary components, the system includes a controller and a temperature sensor. The controller is coupled to the emissive display to provide a driving signal thereby controlling the display luminance. The temperature sensor is located proximate the emissive display and is in electrical communication with the controller. The controller receives a temperature signal from the temperature sensor and varies the luminance based on the temperature signal. As the temperature of the emissive display increases, the controller reduces the display luminance according to a transfer function. The transfer function may have a linear term and / or a non-linear term relating the operating luminance to the display temperature.
Owner:VISTEON GLOBAL TECH INC
Method and system to identify and characterize nonlinearities in optical communications channels
A method for identifying and modeling nonlinearities in communications channels, particularly optical communication channels. A channel in general is modeled as a summation of linear and non linear terms having memory. The terms are functions of the input to the channel with respect to time, such as a sequence of input bits to the channel. In one embodiment the most recent input bits are used to access a value in a look up table. The value accessed is compared to an actual value received from the channel. The difference between the value in the table and the actual channel value may be used to correct the value in the table. When the look up table and the channel converge the look up table contains a model of the channel with memory that can model nonlinearities. A nonlinear channel having memory may also be modeled in terms of Volterra Kernels.
Owner:AVAGO TECH INT SALES PTE LTD
Non-linear filtering for the reconstruction of a surface Electrocardiogram from an endocardial electrogram
InactiveUS20100249623A1Quality improvementElectrocardiographyHeart defibrillatorsEcg signalLinear filter
An active medical device using non-linear filtering for the reconstruction of a surface electrocardiogram (ECG) from an endocardial electrogram (EGM) is disclosed. The device for the reconstruction of the surface ECG comprises: a plurality of inputs, receiving a corresponding plurality of EGM signals from endocardial or epicardial electrogram (x1[n], x2[n]) each collected on a respective EGM derivation of a plurality of EGM derivations, and at least one output delivering a reconstructed surface ECG electrocardiogram signal (y[n]), related to an ECG derivation, and a non-linear digital filter (12′, 12′, 14) with a transfer function that determines the reconstructed ECG signal based on said plurality of input EGM signals. The non-linear digital filter includes a Volterra filter type (12, 12′, 12″) whose transfer function includes a linear term (h1) and at least one quadratic (h2) and / or cubic (h3) term(s).
Owner:SORIN CRM
High-order novel three-dimensional chaos model and circuit thereof
ActiveCN108075732AOvercoming the drawbacks of encryption that is easy to be decipheredRich Dynamic BehaviorSecuring communication by chaotic signalsOscillations generatorsCapacitanceElectrical resistance and conductance
The invention belongs to the technical field of chaos systems, and discloses a high-order novel three-dimensional chaos model and a circuit thereof. The circuit of the high-order novel three-dimensional chaos model comprises three channel circuits. The circuit of the high-order novel three-dimensional chaos model consists of thirty-nine elements, including nine 3554BM operational amplifiers, six multiplying units, three capacitors and twenty-one resistors. The high-order novel three-dimensional chaos circuit disclosed by the invention has a plurality of balance points and a high-order non-linear term, is more complex and abundant in dynamic behaviors, and can be applied to non-linear circuit course experiments. Moreover, the defect that encrypted information of an existing Chaos system isliable to decryption can be overcome, and a basis is laid for the application of a Chaos system.
Owner:XIDIAN UNIV
Method for using polar region ice exploring radar to extract polar region ice layer position
ActiveCN103605118AImprove computing efficiencyFocusRadio wave reradiation/reflectionFrequency spectrumFrequency compensation
The invention discloses a method for using a polar region ice exploring radar to extract a polar region ice layer position. Two-dimensional Fourier transformation is performed on a radar echo signal propagating in a multilayered medium, and a two-dimensional frequency spectrum of the radar echo signal propagating in the multilayered medium is obtained; the two-dimensional frequency spectrum is multiplied by a reference phase factor, and a radar echo signal influenced by range migration is obtained; metric inverse Fourier transformation is used to perform range migration correction on the radar echo signal influenced by the range migration to converted to a range-Doppler domain, and radar echo signal with influence of a range migration factor linear term being eliminated is obtained; a secondary and tertiary range frequency compensation function and a reference function of azimuth direction compression are used to process the radar echo signal with influence of the range migration factor linear term being eliminated, and a fully compensated radar echo signal is obtained; and later azimuth direction Fourier inverse transformation is performed, a focused image is obtained, and by performing range coordinate contraction on the focused image, the position of a layer target detected by the polar region ice exploring radar is obtained.
Owner:INST OF ELECTRONICS CHINESE ACAD OF SCI
Error correction code circuit and memory device including the same
The ECC circuit includes a Chien search unit configured to determine whether there is an error in each bit of a data sequence. The Chien search unit selects a coefficient of a nonlinear term from among terms of an error locator polynomial as a nonlinear coefficient, separates the error locator polynomial into a first location equation including only linear terms and a second location equation including only nonlinear terms, determines a third location equation by dividing the first location equation by the nonlinear coefficient, determines a fourth location equation by dividing the second location equation by the nonlinear coefficient, and determines whether there is an error for each of the bits by performing an XOR operation on a result of the third location equation using the substitution value and a result of the fourth location equation using an arbitrary element of the error locator polynomial as a substitution value.
Owner:SAMSUNG ELECTRONICS CO LTD
An adaptive dynamic surface control method of a chaotic system of a permanent magnet synchronous motor
ActiveCN109245645AEliminate swellingOvercome external disturbancesElectronic commutation motor controlVector control systemsDynamic modelsLow-pass filter
The invention discloses an adaptive dynamic surface control method of a chaotic system of a permanent magnet synchronous motor. The method comprises the following steps: (1) establishing a mathematical dynamic model of the chaotic system of the permanent magnet synchronous motor; (2) introducing first-order low-pass filter to replace the derivative of virtual control for the dynamic equation of permanent magnet synchronous motor by using neural network to approximate the unknown nonlinear term in the system equation; (3) designing the adaptive rate to update the weights of neural network. Theinvention uses RBF network to approximate the non-linear unknown term and the non-linear term of the system model, and the non-linear damping term is overcome to overcome the external disturbance. A first-order low-pass filter is introduced to replace the derivative of the virtual control to eliminate the expansion of the differential term in the inversion control method. The invention can effectively suppress the influence of unknown parameters, chaotic oscillation and external disturbance on the system, and has good effectiveness and robustness.
Owner:GUIZHOU UNIV
Real-time SAR (synthetic aperture radar) imaging method based on improved range migration algorithm
The invention discloses a real-time SAR (synthetic aperture radar) imaging method based on an improved range migration algorithm and mainly solves the problem that imaging cannot be achieved in the prior art. The real-time SAR imaging method is implemented according to the steps of 1) performing preprocessing and range compression on a datum of the nth subaperture and estimating a kinematic error of the nth subaperture; 2) subjecting the datum of the (n+1)th subaperture to kinematic error estimation; 3) obtaining a linear term a1 and a constant term a0 of error difference according to respective kinematic errors of the nth subaperture and the (n+1)th subaperture; (4) compensating the kinematic error of the nth subaperture to the datum of the nth subaperture, and performing imaging to obtain a rough-focus image; (5) projecting the rough-focus image of the nth subaperture to a projection plane; (6) imaging the data of the left subapertures to obtain rough-focus images; (7) splicing all rough-focus images to form an integral aperture image so as to finish real-time imaging. The real-time SAR imaging method is capable of achieving real-time imaging of SAR echo data and applicable to real-time natural disaster evaluation and real-time territorial resource monitoring.
Owner:XIDIAN UNIV
Method for optimizing the power supply for a towed linear transmit antenna for transmitting in omnidirectional mode
InactiveUS20080056069A1Minimize the numberOptimize the numberWave based measurement systemsSeismic data acquisitionSonarAcoustic transmission
The invention relates to sonar transmission means and in particular to transmission means for achieving omnidirectional acoustic transmission. The invention relates to a method for achieving omnidirectional transmission using of a towed linear antenna of length L greater than the wavelength λ of the signal transmitted. The antenna has a plurality of P projectors. The spacing between projectors is substantially less than λ / 2. The method according to the invention includes applying, to each projector, a transmit signal coming from a common transmit signal. The common signal is assigned a delay, the expression for which follows a law containing a non-linear term as a function of the position of the projector in the antenna. Application of this law allows the angular aperture of the transmission pattern to be modulated. The invention makes it possible in particular to produce sonar detection systems comprising transmit and receive antennas having substantially identical diameters, which can be reeled onto the same winch without it being necessary to separate them.
Owner:THALES SA
Method, apparatus, and computer-readable medium for pre-reconstruction decomposition and calibration in dual energy computed tomography
ActiveUS8194961B2Reconstruction from projectionMaterial analysis using wave/particle radiationDecompositionVolumetric Mass Density
A method of obtaining a computed tomography image of an object includes determining linear terms and non-linear beam hardening terms in a pair of line integral equations for dual-energy projection data from inserting average and difference from average attenuation terms, obtaining an initial solution of the line integral equation by setting the non-linear beam hardening terms to zero, and iteratively solving the line integral equations to obtain one line integral equations for each basis material. Attenuation by the first basis material corresponds to a photoelectric attenuation process, and attenuation by the second basis material corresponds to a Compton attenuation process. The line integral equations can be inverted by an inverse Radon procedure such as filtered backprojection to give images of each basis material. The images of each basis material can then be optionally combined to give monochromatic images, density and effective atomic number images, or photoelectric and Compton processes images.
Owner:TOSHIBA MEDICAL SYST CORP
Short-range wide-area SAR high-resolution imaging method based on three-dimensional isometric circle model
ActiveCN110161503AFocusAchieve removalRadio wave reradiation/reflectionHigh resolution imagingImaging condition
The invention discloses a short-range wide-area SAR high-resolution imaging method based on a three-dimensional isometric circle model. Firstly, main linear RCM is removed by using LRWC at a referencepoint, thereby relieving range-azimuth coupling. Secondly, RCM linear terms of all azimuth zero point targets are removed through KT, and part of the range-azimuth coupling is relieved. Based on a processing result of Bulk RCMC, the new three-dimensional isometric circle model is provided; improved residual high-order RCMC of azimuth space variation is provided in range direction processing for processing residual high-order RCM of the azimuth space variation; and SRC is added in subsequent processing to complete the range direction processing. On the basis of the three-dimensional isometriccircle model, derived azimuth space variation slant range analysis formula and analysis formula for space variation of a spatial squint angle along with a ground distance are used for analyzing the influence of azimuth change characteristics of a Doppler phase on imaging, and removing a Doppler center frequency. The method has a better focusing effect in processing SAR echo data under a short-range wide-area and large-squint imaging condition.
Owner:HANGZHOU DIANZI UNIV
Combustor structure optimization method based on response surface method
InactiveCN104036075AAchieve low nitrogen combustion effectSpecial data processing applicationsCombustorNitrogen
The invention relates to a combustor structure optimization method based on a response surface method. The combustor structure optimization method comprises the following specific steps: (1) determining structural factors, required to be considered, of a combustor, and performing coding conversion on the structural factors; (2) determining a test scheme by adopting CCD (Central Composite Design) method; (3) completing a test according to the CCD-based test scheme; (4) establishing a response surface model, and analyzing a test result; (5) performing ridge analysis, and determining an optimized structure parameter combination. According to the combustor structure optimization method, the test scheme is determined by using the CCD method, and the test result is analyzed by virtue of response surface software, so that the linear term influence and the quadratic term influence on the combustion performance of the combustor caused by all the factors can be determined, the cross term influence of all the factors can also be determined, the optimized structure parameter combination is further determined by the ridge analysis, and a low-nitrogen combustion effect is achieved.
Owner:EAST CHINA UNIV OF SCI & TECH
AM to PM correction system for polar modulator
A transmitter includes a polar modulator that creates phase and amplitude signals which in turn drive a power amplifier. To compensate for AM to PM conversion of the amplitude signal into the amplified signal, a compensation signal is generated from the amplitude signal and combined with the phase signal such that when amplified, the compensation signal cancels the AM to PM conversion. The compensation signal may have an offset term, a linear term, a quadratic term, and a cubic term. A second embodiment comprises a technique by which AM to AM conversion may concurrently be addressed using a second compensation signal.
Owner:HUAWEI TECH CO LTD
Non-linear filtering for the reconstruction of a surface electrocardiogram from an endocardial electrogram
Owner:SORIN CRM
Image reconstruction
A system and method of reconstructing an image through solution of a data fitting problem, wherein the data fitting problem is not susceptible to efficient solution as a whole, is disclosed, which may comprise gathering, via a computing device, k-space image data, selecting a data fitting problem solution algorithm for the k-space data, decomposing the data fitting problem solution into a plurality of sub-problem solutions each susceptible to efficient solution separately for the k-space data, obtaining, via the computing device, the plurality of sub-problem solutions for the k-space data, and reconstructing, via the computing device, the image based upon a weighted average of the plurality of sub-problem solutions for the k-space data. The image may be a magnetic resonance image. The data fitting problem may comprise a minimization of a plurality of linear terms of a least square data fitting solution. The image may comprise under-sampled k-space image data.
Owner:RUTGERS THE STATE UNIV
Multi-model adaptive control method and system of continuous stirred tank reactor
InactiveCN105404144AGood control effectGuaranteed stabilityAdaptive controlModel descriptionTemperature control
The invention relates to a multi-model adaptive control method and a system of a continuous stirred tank reactor, the temperature of the continuous stirred tank reactor is controlled, the application range is expanded, an incremental model description of a continuous stirred tank reactor temperature control system is proposed, a new parameter estimation method is proposed, and the multi-model adaptive control method does not need to assume global boundness of a non-linear term of the system. The problem of non-minimum phase of the continuous stirred tank reactor can be solved via the introduction of a pole placement controller. The invention brings forward a new non-linear control structure capable of improving the precision of the multi-model adaptive control method. Compared with the conventional non-linear multi-model adaptive control method, the multi-model adaptive control method is promoted to the non-minimum phase continuous stirred tank reactor temperature control system, and the adaptability of a multi-model adaptive controller can be effectively improved.
Owner:SHANGHAI JIAO TONG UNIV
Charge Pump Linearization Technique For Delta-Sigma Fractional-N Synthesizers
ActiveUS20100327981A1Reduce in-band noiseImprove referencePulse automatic controlElectric variable regulationLinear termCharged current
A delta-sigma fractional-N frequency synthesizer having a charge pump with error canceling circuitry eliminates a non-linear term from the charge pump transfer function. The charge pump includes a matched pair of charging current sources, each supplying a first current IP1 to a common node, when enabled. The charge pump also includes a matched pair of discharging current sources, each sinking a second current IN1 from the common node, when enabled. The error canceling circuitry includes a charging current source, which supplies a current equal to the second current IN1 to the common node, when enabled. The error canceling circuitry also includes a discharging current source, which sinks a current equal to the first current IP1 from the common node, when enabled. The charging and discharging current sources of the error canceling circuitry are both enabled when either one of the matched pairs of charging and discharging current sources is enabled.
Owner:INTEGRATED DEVICE TECH INC
Method for measuring popping ball deficiency in popping ball filter stick, readable storage medium and equipment
The invention provides a method for measuring popping ball deficiency in a popping ball filter stick, a readable storage medium and equipment. The method comprises the following steps that: determining the value range of the density wave crest of each popping ball; fitting a curve equation Y=aijX2+bijX+cij of the density wave crest of each popping ball, wherein Y is the density of the density waveof the popping ball, X is a detection unit serial number corresponding to the density, aij, bij and cij are independently the quadratic term coefficient, the linear term coefficient and the constantcoefficient of the curve equation of the jth popping ball of the i filter stick; and comparing -aij with p or p' to judge whether the jth popping ball of the i filter stick is subjected to deficiencyor not.
Owner:CHINA TOBACCO SHANDONG IND
Image processing method and image processing device based on neural network
ActiveCN106548207AEnhance expressive abilityIncrease training complexityCharacter and pattern recognitionNeural architecturesFeature vectorImaging processing
The invention discloses an image processing method and an image processing device based on a neural network in order to solve the problem that the accuracy of image processing is low in the prior art. The method comprises the following steps: receiving a to-be-processed image; and processing the to-be-processed image by use of a neural network containing at least one transformation layer which is a factor decomposition bilinear layer to get a processing result, wherein the output result of each neuron in the factor decomposition bilinear layer is the sum of the linear term of the input feature vectors of the neuron and the factor decomposition quadratic term characterizing the correlation between the input feature vectors of the neuron. According to the technical scheme, the factor decomposition quadratic term characterizing the correlation between the input feature vectors of each neuron is added to the output result of the neuron, so that the expression ability of the neural network is improved. Through image processing using the neural network with strong expression ability, the accuracy of image processing is improved.
Owner:BEIJING TUSEN WEILAI TECH CO LTD
Speech presence probability calculation method, speech presence probability calculation device and electronic equipment
ActiveCN106997768AReduce computationImprove robustnessSpeech analysisSignal-to-noise ratio (imaging)Linear term
The invention provides a speech presence probability calculation method, a speech presence probability calculation device and electronic equipment. A measurement parameter for a first channel signal signal-to-noise ratio and a measurement parameter for a signal power level difference between the first channel and a second channel are introduced in the speech presence probability calculation, the above measurement parameters are subjected to normalization and nonlinear transformation processing, a linear term and a product term of power series of the above parameters are used for fitting the speech presence probability, the computation burden for the speech presence probability can be reduced, the computation result is more robust to parameter fluctuation, and the method and the device can be widely applied to an application scene for each two-microphone speech enhancement system.
Owner:CHINA ACAD OF TELECOMM TECH
Rational approximate optimization method for unsteady aerodynamic load of aerodynamic servo elastic system
ActiveCN110674599AEnables Efficient Derivative ComputationGeometric CADSustainable transportationAerodynamic loadOriginal data
The invention discloses a rational approximate optimization method for an unsteady aerodynamic load of an aerodynamic servo elastic system. Two types of original data of an analysis structure are obtained through existing commercial engineering numerical calculation software. On the basis, an unsteady aerodynamic force rational approximate expression form recognized by modern engineering analysisis applied, and a two-stage alternating double-iteration numerical optimization algorithm of two variables including a linear term coefficient and a nonlinear term coefficient is established. Two-stage double optimization iteration is performed until an optimal coefficient in a high-precision rational approximate fitting formula is obtained. The prediction precision of the unsteady aerodynamic load process in modeling analysis of the aerodynamic servo elastic system of the airplane selected structure is improved, rational approximate fitting errors are greatly reduced, and therefore high-precision load process numerical values are provided for dynamic response, dynamic stability and active elastic control of the airplane aerodynamic servo elastic system.
Owner:NORTHWESTERN POLYTECHNICAL UNIV +1
Transcendental function evaluation
The present invention discloses a transcendental function evaluation. In described examples, an apparatus 500 is arranged to generate a linear term, a quadratic term, and a constant term of a transcendental function with, respectively, a first circuit 530, a second circuit 550, and a third circuit 580 in response to least significant bits of an input operand 510 and in response to, respectively, afirst, a second, and a third table value 520 that is retrieved in response to, respectively, a first, a second, and a third index generated in response to most significant bits of the input operand.The third circuit 580 is further arranged to generate a mantissa of an output operand in response to a sum of the linear term, the quadratic term, and the constant term.
Owner:TEXAS INSTR INC
Method for correcting gray distortion of nuclear magnetic resonance image
ActiveCN103630860AGray scale distortion correctionImprove image qualityMagnetic measurementsWeight coefficientImaging quality
The invention discloses a method for correcting gray distortion of a nuclear magnetic resonance image. The method comprises the following steps that: spherical-harmonic expansion is performed on a nonlinear gradient field so as to obtain a linear term and a higher-order nonlinear term; the heterogeneity of the gradient field can be obtained through conventional fast Fourier transform (FFT); a heterogeneous mapping relationship between the geometric position and brightness of the image is obtained; a weighted coefficient between the nonlinearity of the gradient field and the gray distortion of the image; and therefore, the correction of the gray distortion of the image can be accomplished. Compared with the prior art, the method for correcting the gray distortion of the nuclear magnetic resonance image of the invention can quickly realize the correction of the gray distortion of the nuclear magnetic resonance image, and therefore, imaging quality and the reliability of clinical diagnosis can be improved, and the method has important significance in the nuclear magnetic resonance imaging field.
Owner:JIANGSU MAGSPIN INSTR
Simulation of microstructure evolution of material as solved based on exponential time-difference format
PendingUS20220058311A1Improve accuracyImprove stabilityChemical processes analysis/designDesign optimisation/simulationTheory modelComputational physics
A method and device for simulating microstructure evolution of a material based on solution in an exponential time-difference format. The method includes: establishing a reaction rate theory model for substance defects, wherein the model is expressed with equations that comprise linear terms having coefficients characterized with matrixes; and iteratively solving the equations by using an exponential time-difference format, wherein during the iterative solving, the linear terms with exponential powers of the matrixes as the coefficients are integrated. Since a rate theory is not limited by spatial-temporal scales, the advantages of the rate theory can be significantly reflected when the microstructure evolution is simulated under a high damage dose condition; and then, the equations are solved by using the exponential time-difference format, with a solved result better in accuracy and higher in precision.
Owner:CHINA INSTITUTE OF ATOMIC ENERGY +1
Systems and methods for manufacturing semiconductor device
A method of manufacturing a semiconductor device includes preparing a reticle having at least three mask registration keys on respective four sides of a key field, aligning the reticle by irradiating light, after mounting the reticle on an exposure system, and measuring a mask registration including a non-linear term of the reticle from the mask registration keys using the irradiated light.
Owner:SAMSUNG ELECTRONICS CO LTD
Non-linear filtering for the reconstruction of a surface electrocardiogram from an endocardial electrogram
An active medical device using non-linear filtering for the reconstruction of a surface electrocardiogram (ECG) from an endocardial electrogram (EGM) is disclosed. The device for the reconstruction of the surface ECG comprises: a plurality of inputs, receiving a corresponding plurality of EGM signals from endocardial or epicardial electrogram (x1[n], x2[n]), each collected on a respective EGM derivation of a plurality of EGM derivations, and at least one output delivering a reconstructed surface ECG electrocardiogram signal (y[n]), related to an ECG derivation, and a non-linear digital filter (12′, 12′, 14) with a transfer function that determines the reconstructed ECG signal based on said plurality of input EGM signals. The non-linear digital filter includes a Volterra filter type (12, 12′, 12″) whose transfer function includes a linear term (h1) and at least one quadratic (h2) and / or cubic (h3) term(s).
Owner:SORIN CRM
A Ship Dynamic Positioning Control System Based on Equivalent Disturbance Compensation
ActiveCN105867382BControl localization to desired stateEasy to controlPosition/course control in two dimensionsThree degrees of freedomState observer
Owner:HARBIN ENG UNIV
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