30 results about "Pulse pattern" patented technology

The invention relates to a human body health state assessment system and assessment method based on multi-point acquisition, and the system comprises an event sensing module which is used for collecting an image data signal, a physiological signal and an environment data signal of a human body, and outputting an asynchronous pulse event flow when the signal change is detected; the pulse coding module is used for generating a space-time pulse sequence through a preset adaptive threshold coding technology; the neural network processing module is used for performing event driving processing by utilizing leakage integral distribution neurons in a preset pulse neural network according to the space-time pulse sequence to obtain a current health characteristic pulse mode; and the health state decoding module is used for obtaining a health state score and a risk classification result of the current human body through a preset pulse distribution rate analysis algorithm and a preset time sequence decoding technology according to the current health characteristic pulse mode. Therefore, the problems of high power consumption, high delay, low data transmission efficiency, low early pathological feature recognition accuracy and the like of a human health state evaluation system are solved.

The invention provides an operation state data processing method and system applied to an electronic circuit board, and the method comprises the steps: obtaining the real-time voltage fluctuation data of each power path of the electronic circuit board in a preset monitoring time, and carrying out the self-adaptive time-frequency decomposition of the real-time voltage fluctuation data; separating to obtain a steady-state substrate component representing stable operation characteristics of the circuit board and an instantaneous pulsation component reflecting an instantaneous interference phenomenon, and constructing an amplitude-time sequence correlation heat map in a two-dimensional data plane based on an amplitude change sequence of the steady-state substrate component and a time interval parameter corresponding to a sampling timestamp; performing pixel-by-pixel morphological fusion on the pulse pattern and a standard pulse pattern stored when the circuit board leaves a factory to generate a fusion difference spectrum containing space distribution characteristics of difference pixels, and calculating a state coupling coefficient of each power supply path according to the space density distribution characteristics of the difference pixels; and integrating the state coupling coefficients of all the power paths to obtain a quantitative condensation index. According to the invention, the reliability and comprehensiveness of operation state evaluation can be improved.

The present invention relates to the field of (digitally controlled) electric motors, (digital) control systems, (electric) motor-based systems, including those (digital) control systems, and methods relating thereto. The present invention addresses the complexity of dynamic switching between two or more different modulation algorithms, such as SVPWM (Space Vector Pulse Width Modulation), SPWM (Sinusoidal Pulse Width Modulation), THIPWM (Third Harmonic Pulse Width Modulation), DPWM (Discontinuous Pulse Width Modulation), OPP (Optimized Pulse Pattern).

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.

An electroporation system is provided. The electroporation system includes a catheter comprising a plurality of electrodes; and a pulse generator coupled to the catheter, the pulse generator being configured to generate a waveform delivered using at least one of the plurality of electrodes. The waveform includes a first pulse pattern and a second pulse pattern consecutive to the first pulse pattern, wherein the pulse period defined between the start point of the first pulse pattern and the start point of the second pulse pattern is in the range of 1 millisecond (ms) to 100 ms, such that the waveform contributes to increasing the depth of lesion.

The invention provides a traditional Chinese medicine pulse diagnosis instrument based on artificial intelligence and a data analysis method thereof. The pressure detection mechanism comprises an air bag wrapping the to-be-detected part, an inflation part used for inflating the air bag to enable the air bag to pressurize the to-be-detected part of the user, a gas pressure sensor linked with the air bag and a flexible pressure sensor, and the pressure detection mechanism is used for applying different pressures to the to-be-detected part and collecting pulse information under the different pressures; the data acquisition module is used for converting the analog signal into a digital signal and preprocessing the digital signal; the signal processing module is used for carrying out segmentation, calibration, normalization and SG smoothing on the pulse waveform and extracting features; and the pulse condition analysis module is used for carrying out pulse condition recognition and classification on the quantization parameters by utilizing a machine learning algorithm. According to the method, pulse information under different pressures is collected and processed, and stable, accurate and lossless collection and quantitative analysis of pulse condition information are achieved through one-to-one mapping of characteristic values and traditional Chinese medicine conclusions.

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.

Systems, methods, and computer program products are provided for calibrating ultrasonic flow sensors. An example system includes an ultrasonic flow sensor that includes a flow tube, a first piezoelectric sensor or transducer, and a second piezoelectric sensor or transducer; and at least one processor configured to: (vi) modify, based on (i) whether a signal-to-noise ratio (SNR) associated with at least one ultrasonic signal satisfies at least one threshold SNR ratio and (ii) whether the at least one ultrasonic signal includes saturation, a number of excitation pulses included in an excitation pulse pattern.

The invention discloses a control method of a nasal irrigator and the nasal irrigator, and relates to the technical field of nasal irrigators. The control method comprises the step of controlling to enter a pulse mode in response to a pulse starting instruction. In a pulse mode, at least M PWM signals with different duty ratios are circularly and alternately output so as to drive the water outlet assembly to generate changing (M-1) groups of pulse water flows; wherein M is a positive integer greater than 1. Thus, diversified pulse water flow can be provided, natural physiological stimulation can be more effectively simulated or flushing can be conducted on nasal cavity areas with different blocking degrees, and stubborn secretions and particulate matter can be more thoroughly loosened and removed through the variable water flow intensity; cleaning dead angles or insufficient flushing possibly caused by single-intensity water flow is avoided, and the problem that an existing nasal irrigator is poor in cleaning effect is solved.

A pulse diagnosis device and pulse pattern recognition method are disclosed. The pulse diagnosis device includes: a wearable body for wearing on the wrist to be tested; the wearable body is provided with a pressure sensing mechanism and an ultrasound detection mechanism; wherein the ultrasound detection mechanism is used to locate at least three target pulse points on the wrist to be tested; the pressure sensing mechanism is used to apply gradient pressure to the at least three target pulse points on the wrist to be tested and to collect the pulse pressure signals of the at least three target pulse points under the action of the gradient pressure; the ultrasound detection mechanism is also used to collect vascular feature information corresponding to each of the at least three target pulse points. The technical solution of this application can effectively improve the accuracy of the pulse diagnosis device.

Method for regulating and / or controlling an electrical machine by extended synchronous modulation based on space vector modulation, using the following input variables: - a set (α) of switching times (α1, ..., α x ), which appear within a subsequent sampling interval, - a current angular error (α Error,Now ) and a subsequent angular error ( α Error,Next ), - a minimum switching angle (α min ), where an online calculation of switching angles (τ1) and a flow trajectory (ψ) ab ) is done, and where pulse pattern (s uvw (γ el )) depending on a modulation level (m) can be calculated online, characterized by the fact that with different signs of the angular error (α) Error,Now , α Error,Next ) α the smaller angular error in absolute value (α Error,Now , α Error,Next) determines the maximum switching time (Δα) Error,max ) can potentially be redistributed, where by summing all around the minimum switching angle (α min ) reduced switching times from the set (α) that corresponds to a current or subsequent space vector ( u → Now , u → N ext ) are associated with the switching time (Δα) Now,max , Δα Next,max ) is determined to predict the occurrence of the space vector ( u → Now , u → N ext ) can be reduced to a maximum within the sampling interval, - where in the case of a negative current angular error (α) Error,Now ) to shorten the current space vector ( u → Now ) the actual switching time to be redistributed (Δα) from the minimum of the maximum switching time (Δα) Error,max ) and α of the switching time (Δα Now,max) is determined, whereby the switching duration to be redistributed (Δα) is chronologically distributed to the corresponding switching durations (α) Now,i ) divided and then each individual switching duration (α) Now,i ) to determine the corresponding Δα i is reduced, whereby the extension of the switching state ( u → N ext ) to determine the switching duration to be redistributed (Δα) solely by considering the first associated switching duration (α) Next,1 ) is done, - where in the case of a positive angular error (α Error,Now ) to shorten the space vector ( u → N ext ) the actual switching time to be redistributed (Δα) from the minimum of the maximum switching time (Δα) Error,max ) and the switching time ( Δα Next,max ) is determined, whereby the switching duration to be redistributed (Δα) is chronologically distributed to the corresponding switching durations (α) Next,i ) divided and then each individual switching duration (α) Next,i ) around the corresponding (Δα i) is reduced, whereby the extension of the switching state ( u → Now ) to determine the switching duration to be redistributed (Δα) solely by considering the first one for the switching state ( u → Now ) apparent switching time (α) Now,1 ) is carried out, where the modified set (α) of switching durations is output.

An implantable nerve stimulation device is configured with a current delivery architecture having at least two digital-to-analog converters (DACs); and a therapy definition circuit using the therapy configuration is provided, which allows the two therapy configurations to be linked together. When two therapy configurations are linked, each therapy configuration uses a different one of the DACs to deliver therapy in an overlapping or simultaneous manner using the same or different electrodes.

Methods and systems are provided herein for an adjustable current individualized stimulation system. In one example, a stimulation system comprises a device comprising a plurality of stimulation electrodes and at least one isolated current source (ICS), wherein the device is configurable to adjust current parameters and a pulse pattern of pulses of stimuli applied to a patient.

A semiconductor device for generating PWM modulation signals, for example an optimized pulse pattern (OPP), is provided. An ADC 42 outputs the motor angle and is connected to a coprocessor 52, for example a digital signal processor (DSP). The coprocessor 52 has an observer 44 connected to the angle inputs for generating a motor angle, and a lookup table 48 for generating a PWM signal as a direct function of the generated motor angle. A processing unit 46 has an input connected to the coprocessor 52, and the processing unit is configured to select a lookup table based on the generated motor angle and to store the selected lookup table as the lookup table 48.

The invention discloses a porous medium multi-sequence splitting lap-joint net-forming grouting control method and system, and belongs to the technical field of grouting engineering.By conducting multi-sequence splitting lap-joint net-forming grouting with multiple sequences and the interval set time of the adjacent sequences, in the interval time between every two sequences, due to the viscosity time-varying characteristic of grout, the number of the multiple-sequence splitting lap-joint net-forming grouting is increased, and the number of the multiple-sequence splitting lap-joint net-forming grouting is increased. And the tip of the previous order split pulp vein tends to be initially set. The local stress distribution is changed due to the initial setting of the preorder slurry vein part, so that the subsequent cleavage channel is forced to occur at a new position and diffuse in a new direction, and after bypassing the influence range of cleavage-compaction-initial setting of the preorder cleavage slurry vein, the subsequent cleavage channel returns to develop in the direction of the maximum principal stress, and a dendritic cleavage slurry vein form is formed in a target grouting range; the mechanical reinforcement effect of splitting a pulp vein framework to form a net is achieved in an injected medium; and the defect that only trunk split pulp veins with limited quantity and single direction are formed due to continuous diffusion of the pulp along a dominant split channel in the direction of the maximum principal stress is avoided.

The application discloses a kind of pore medium multi-sequence split lap netting grouting control method and system, belong to grouting engineering technical field, by carrying out multi-sequence and adjacent sequence interval setting time multi-sequence split lap netting grouting, in the interval time between every two sequences, due to the time-varying characteristics of slurry viscosity, the tip of previous sequence split slurry pulse tends to initial setting.Due to the partial initial setting of previous sequence slurry pulse, the local stress distribution changes, forcing the post-sequence split channel to occur in a new location and spread in a new direction.After passing through the influence range of the previous sequence split slurry pulse "splitting- compaction-initial setting", it returns to develop along the direction of the maximum principal stress, forming a dendritic split slurry pulse pattern in the target grouting range, which plays a mechanical reinforcement effect of splitting slurry pulse skeleton netting in the grouted medium;Avoid the disadvantage of continuous splitting channel diffusion of slurry along the direction of the maximum principal stress, only forming a limited number of main trunk split slurry pulses with a single direction.

A method for controlling an electrical converter is provided. The invention relates to an electrical converter comprising a main stage adapted to convert a DC voltage into an intermediate voltage having at least two voltage classes, and a filter cell stage having filter cells for each phase of the main stage, the main stage comprising a DC link, and each filter unit is adapted to add or subtract the unit voltage of the filter unit to the intermediate voltage. The method comprises the following steps: determining a first optimized pulse pattern of the primary stage and a second optimized pulse pattern of the filter unit from optimized pulse patterns calculated offline, the first optimized pulse pattern comprising a switching time of the primary stage on the next calculation window (); and wherein the second optimized pulse pattern comprises a switching time of the filter unit on the next calculation window (); determining a midpoint potential (VNP) based on the measured lower DC link voltage and the measured upper DC link voltage of the DC link; determining a first balance signal for the primary stage based on the determined midpoint potential (VNP), determining a second balance signal for the filter cell based on a measured cell voltage of the filter cell; determining a first differential mode voltage from the first balanced signal; determining a second differential mode voltage from the second balanced signal; determining a first voltage change from the first balanced signal and the second differential mode voltage; determining a second voltage change ([delta] UAF, abc) from the second balanced signal and the first differential mode voltage; adjusting the first optimized pulse pattern by moving a switching time of the first optimized pulse pattern on the next calculation window based on the first voltage change, and adjusting the second optimized pulse pattern by moving a switching time of the second optimized pulse pattern on the next calculation window based on the second voltage change; determining a reference flux trajectory on the next computational window based on the adjusted first and second optimized pulse patterns; and controlling the electrical converter based on the determined reference flux trajectory and the adjusted first and second optimized pulse patterns.

In some embodiments, a method of providing a neurostimulation therapy to a patient, comprises: generating a noise pulse pattern defining a pulse train of pulses to be generated according to a noise profile in an external device; communicated the generated noise pulse pattern to an implantable pulse generator (IPG) of a patient; generating, by the IPG, a series of pulses in sequence for noise stimulation of the patient using the noise pulse pattern from the external device, wherein the IPG applies one or more randomization operations to the pulse pattern from the external device without expanding memory storage for the pulse pattern while maintaining the noise profile of the pulse pattern from the external device; and applying the series of pulses in sequence to neural tissue of the patient using one or more electrodes of one or more stimulation leads.

Methods for controlling an electric motor using an inverter and optimal pulse patterns (OPPs) are provided. The method includes pre-generating a plurality of optimal switching angles corresponding to voltage waveforms for a range of modulation indices; storing the pre-generated optimal switching angles; generating a voltage command using a model-free predictive controller based on a flux error signal of the electric motor; selecting optimal switching angles from stored pre-generated optimal switching angles based on the voltage command; modifying the selected optimal switching angles using a pulse pattern modifier to compensate for dynamic changes in motor operating conditions; and generating gating signals for the inverter based on the modified switching angles to drive the electric motor.

Systems, methods, and computer program products are provided for calibrating ultrasonic flow sensors. An example system includes an ultrasonic flow sensor that includes a flow tube, a first piezoelectric sensor or transducer, and a second piezoelectric sensor or transducer; and at least one processor configured to: (vi) modify, based on (i) whether a signal-to-noise ratio (SNR) associated with at least one ultrasonic signal satisfies at least one threshold SNR ratio and (ii) whether the at least one ultrasonic signal includes saturation, a number of excitation pulses included in an excitation pulse pattern.

The invention provides a data / knowledge collaboratively driven pulse map Gaussian mixture feature extraction method and device, and relates to the field of data processing. The method comprises the following steps: acquiring a PPG signal; the PPG signal is a photoplethysmography signal; based on the PPG signals, structural features are extracted through a Gaussian mixture model; extracting physiological features based on physiological feature points of dominant waves, reflected waves and dicrotic waves in the PPG signals; the physiological features have clear physiological significance; on the basis of the distribution interval of the physiological features, constructing a constraint space, and taking the constraint space as a boundary condition for parameter optimization of a Gaussian mixture model to obtain an optimized Gaussian mixture model; and on the basis of the optimized Gaussian mixture model, pulse map Gaussian mixture features of the PPG signals are extracted. The PPG signal feature extraction method and device are used in the data / knowledge collaborative driven pulse map Gaussian mixture feature extraction process, and the technical problem that in the prior art, PPG signal feature extraction effectiveness and interpretability are difficult to consider at the same time is solved.

A neurostimulation system configured for providing neurostimulation therapy to a patient. A user customizes a pulse pattern on a pulse-by-pulse basis. Electrical stimulation energy is delivered to at least one electrode in accordance with the customized pulse pattern.

Method for determining a current space vector and an offset of a current measurement, where the motor current of an inverter-fed electric motor is measured, with means arranged in the bridge branches of the inverter for scanning the currents flowing in the bridge branches, where the motor current space indicator is non-vanishing, wherein, in a bridge branch that is not energized at the time of measurement, the current detected by the means arranged in that bridge branch is recorded as an offset value for the current detection in that bridge branch, wherein the respective switched-off bridge branch, in which the respective current offset value is determined, is chosen differently depending on the average output voltage space vector, by not determining an offset value in the bridge branch for which the expected time interval for a vanishing current sample value is too short to perform interference-free acquisition, and only determining an offset value when the mean output voltage space vector is correspondingly changed, i.e., when the time interval for a vanishing current sample value is then sufficiently long for interference-free acquisition. wherein the current space vector is determined from the current sampling values ​​determined in switched-on bridge branches, wherein the mean output voltage space vector is determined by the differences of the output potentials of the three output phases averaged over one pulse width modulation period, where - to control the half-bridges, a pulse pattern is generated within a time interval equal to one pulse width modulation period, such that at a first sampling time lying within the pulse width modulation period, at least one upper or one lower bridge branch, equipped with means for sampling the current, is switched off. wherein in a further switched-off bridge branch current sampling values ​​lying symmetrically before and after the first sampling time are recorded in order to determine the offset value.

An apparatus for optic fiber measurement based on Brillouin optical correlation domain analysis using pulse waveform control of bits is disclosed, the apparatus including a PRBS generation unit generating electrical two identical electrical pulse pattern signals so that a probe optical signal and a pump optical signal have a time difference, and generating a first PRBS signal and a second PRBS signal by distorting a per-bit pulse waveform of each two pulse pattern signals; a probe phase modulation unit performing phase modulation of the probe optical signal according to the first PRBS signal; a pump phase modulation unit performing phase modulation of the pump optical signal according to the second PRBS signal; and a BOCDA sensor unit measuring Brillouin gain spectrum by inputting the probe optical signal and the pump optical signal with the time difference to both ends of a sensing optical fiber.

The application provides a partial discharge detection pattern data compression and decompression method and system, which comprises the following steps: obtaining a partial discharge pulse pattern, wherein the partial discharge pulse pattern comprises a plurality of pulse signals; during compression, one power frequency cycle is divided into a plurality of phase windows, the amplitude is represented in a logarithmic form, 7 bit positions are occupied, 1 bit position is used to represent whether the data after the amplitude data is the amplitude or the interval number, the interval number is used to replace the cycle number, and 8 bit positions are occupied; during decompression, the opposite idea is adopted to obtain decompression data.

In a method for controlling an inverter (I) having a plurality of half-bridges (P1 - P3), a pulse pattern is to be obtained which characterizes target switching times of semiconductor switches (11 - 13, 21 - 23) of the inverter (I). Switching times (ZA, ZB) of different switches (11 - 13, 21 - 23) separated from one another by less than a minimum duration are determined as switching times (ZA, ZB) that are too close to one another, which is linked to a fault in the actuation signals of the switches (11 - 13, 21 - 23). The switches (11-13, 21-23) of the inverter (I) are controlled according to the target switching times and according to shifted switching times. The shifted switching times (ZA', ZB) are obtained by shifting the switching times that are too close to one another. The second switching times (ZA', ZB) are then temporally separated from one another by more than the specified duration. The invention also relates to a corresponding control device and to a corresponding vehicle drive.

A semiconductor device for generating PWM modulation signals, for example an optimized pulse pattern OPP is provided. An ADC 42 outputs the angle of the motor, and is connected to a coprocessor 52 for example a digital signal processor DSP. The coprocessor 52 has an observer 44 connected to the angle inputs for generating a motor angle and a look up table 48 for generating a PWM signal as a direct function of the generated motor angle A PWM signal is output to timer unit 50. A calculating unit 46 has an input connected to the coprocessor 52, the calculating unit being arranged to select a look up table based on the generated motor angle and to store the selected look up table as the look up table 48.

An electrical converter (10) comprises a main stage (12) adapted for converting a DC voltage into an intermediate voltage comprising at least two voltage levels and a filter cell stage (14) with a filter cell (30) for each phase of the main stage (12), each filter cell (30) being adapted for adding or subtracting a cell voltage of the filter cell (30) to the intermediate voltage. A method for controlling an electrical converter (10) comprises a pattern determination part (44) comprising the steps of: selecting and reading an offline-computed optimized pulse pattern (OPPbase) from a database, wherein the selected optimized pulse pattern (OPPbase) comprises switching instants for the main stage (12) and the filter cells (30) over a next computation window (αwin) of a predetermined width (αw); adjusting the optimized pulse pattern (OPPbase) by moving its switching instants such that average output voltages generated in the filter cells (30) are shifted towards an average output voltage reference (Ubal,abc) of the filter cells (30), which is determined from measurements in the filter cells (30), and compensating these adjustments by corresponding modifications of switching instants of the main stage (12). The method comprises further a model predictive control part (46) comprising the following steps, which are performed several times during the next computation window (αwin): modifying the adjusted optimized pulse patterns (66) by moving at least one transition time of a switching instant, such that a flux error determined from a difference between an estimated flux (74) of the electrical converter (10) and a reference flux trajectory (Ψref) is minimized; and applying at least a next switching instant from the modified adjusted pulse pattern to the electrical converter (10).