143 results about "Waveform shaping" patented technology

An intraoral device for dental isolation and fluid evacuation is disclosed. The device includes a first flap and a second flap positioned adjacent to the first flap to form an evacuation chamber, the second flap including a plurality of peaks and troughs forming a waveform shape at a first edge and a second edge of the second flap, the plurality of peaks and troughs forming a plurality of channels in fluid communication with the evacuation chamber; and an evacuation source connection portion including an opening that is in fluid communication with the evacuation chamber and configured to facilitate fluid evacuation when the evacuation source connection portion is attached to an external vacuum suction device, wherein an interior second flap surface is configured to touch an interior first flap surface at the plurality of troughs at least when suction is applied by the external vacuum suction device.

According to the repeated impact test device for multiple impact tests and the loading waveform control method, a special-shaped impact rod is adopted to replace a traditional cylindrical impact rod, the end, making contact with the impact rod, of an incident rod is designed into a cone, and the diameter of the end face of the incident rod with the special-shaped end is consistent with that of the end face of the special-shaped impact rod; aiming at the requirements of the tested material and structure on the loading waveform, the waveform with different forms and different rising edges can be realized by designing the cone angle and the shape of a cone or designing a complex curve profile, a multi-segment cone and the like, and the accurate control of the loading waveform is realized; according to the automatic multi-impact test device based on the split Hopkinson pressure bar, the defect that disposable accessories need to be replaced in a traditional waveform shaping control method can be overcome, it is guaranteed that the waveform meets the test requirement during impact loading every time, the amplitude is constant, the waveform is consistent, stable and reliable, the test precision and efficiency are improved, and the test cost is reduced. The device can be applied to automatic multiple impact tests based on the split Hopkinson pressure bar.

A time series of raw performance data samples pertaining to performing of a set of repetitions of a movement by a user is collected from a sensor. A set of features is generated from the collected time series of raw performance data samples, including by extracting one or more waveform shape features. The set of features, including the extracted one or more waveform shape features, is provided as input to a model that outputs an estimate of repetitions in reserve.

The method includes, for example in one embodiment, exposing an odorant to a sensor array having a first sensor and a second sensor respectively configured with a first response characteristic and a different second response characteristic. In one embodiment, in response to the odorant, the first sensor outputs a first sensor signal having a signal-time characteristic and the second sensor outputs a second sensor signal having a different signal-time characteristic due to the different second response characteristic. In one embodiment, the method includes generating a signal having a complex waveform shape corresponding to the odorant, and optionally to a concentration of the odorant, using the first sensor signal and the second sensor signal. The generating includes, for example in one embodiment, converting the first sensor signal and the second sensor signal into respective sensor signal modulated oscillatory signals, and combining the sensor signal modulated oscillatory signals.

The utility model discloses a frequency converter output overcurrent protection circuit comprising a reference power supply circuit used for stably outputting a 5V voltage; the current sampling circuit is used for collecting the IGBT output current and converting the IGBT output current into a voltage signal to be output; the comparison circuit is used for comparing the acquired voltage signal with a set value and then outputting a level signal; and the buffer circuit is used for acquiring the level signal and outputting a VCE signal. According to the frequency converter output overcurrent protection circuit, output current is detected through the current detection circuit, the comparator is used for comparing real-time current values and controlling output overcurrent signals, and the phase inverter is used for carrying out waveform shaping on the output signals, so that the integrity of the signals is ensured.

The invention discloses a photoelectric red envelope acousto-optic cooperative trigger response control method, and belongs to the technical field of photoelectric control, and the method comprises the steps: extracting the ripple content from a filtered signal, comparing the ripple content with a reference value, and obtaining the quantitative representation of the ripple increase amplitude; calculating an excess between the ripple increase amplitude and a preset ripple threshold; and inputting the excess into a dynamic adjustment model to obtain a current-limiting resistance value, a filter capacitor capacity and a shaping circuit time constant of the waveform shaping circuit, and obtaining the stability of the driving current waveform and the repeatability of acousto-optic cooperative starting by iteratively adjusting the current-limiting resistance value, the filter capacitor capacity and the shaping circuit time constant. The core contradiction that the triggering sensitivity and the system stability are difficult to consider in a complex working environment in the existing light source driving technology is solved, and the technical effects of improving the photoelectric triggering accuracy, enhancing the anti-interference capability of the system and ensuring the high repeatability of acousto-optic cooperative starting are achieved.

The invention relates to the technical field of electronics, and discloses a level conversion circuit, a PCB and a chip, and the level conversion circuit comprises a shaping unit, a boost unit, a conversion unit and a suppression unit. The shaping unit is electrically connected with the boosting unit, the boosting unit is electrically connected with the conversion unit and the suppression unit, and the conversion unit is electrically connected with the suppression unit; the shaping unit is used for performing waveform shaping on an input signal, the boosting unit is used for boosting a high level of the input signal to a target working voltage, the conversion unit is used for converting the input signal into a level signal, and the suppression unit is used for suppressing a transient negative voltage peak generated in a level conversion process; in the level conversion circuit, the suppression unit effectively suppresses transient negative voltage spikes generated in the level conversion process, the transient negative voltage spikes are prevented from exceeding the logic threshold value of a downstream circuit, and the accuracy and stability of signals in the level conversion process are guaranteed.

The application is a divisional application of 202610037205.X, and discloses a signal processing method, device, equipment, system, storage medium and product. A to-be-processed signal output by a target signal after passing through a nonlinear device is processed in sections to obtain a plurality of first signal regions; a preset type determination strategy is used to determine region types to which the plurality of first signal regions correspond respectively, wherein the preset type determination strategy is determined based on a steepness of a waveform shape; for each first signal region, a compensation strategy matched with a region type corresponding to the current first signal region is used to compensate a sub-signal in a corresponding region of the target signal for the current first signal region by using an ideal signal, to obtain a compensation signal corresponding to the current first signal region; and a pre-distortion signal corresponding to the ideal signal is determined according to the compensation signals corresponding to the plurality of first signal regions respectively. The application can provide an effective pre-distortion signal for a signal with complex and changeable forms.

A drowsiness degree estimation device is provided with: a Doppler sensor that detects a pulse wave of a user; and an analysis unit that analyzes the pulse wave detected by the Doppler sensor, generates an index value that digitizes the pulse wave on the basis of chaotic analysis in which pulse wave shape displacement, which is a time-series displacement of the waveform shape of the pulse wave, is used as an analysis source, and estimates the degree of drowsiness of the user on the basis of the index value. And the drowsiness degree information related to the drowsiness degree is output.

The invention discloses a wireless optical communication system adopting an amplitude limiting amplification method, which relates to the technical field of wireless optical communication and comprises a transmitting subsystem and a receiving subsystem. The transmitting subsystem is used for generating a serial signal, processing the serial signal, converting the serial signal into an optical signal and transmitting the optical signal; and the receiving subsystem is used for receiving and converting the optical signal into a current signal, converting the current signal into a signal in a voltage form, amplifying the signal, performing waveform shaping and effective bandwidth expansion on the amplified signal through the nonlinear amplitude limiting characteristic of a bandwidth expansion module, and decoding and recovering the signal after bandwidth expansion. According to the invention, the bandwidth of the system is directly expanded by using the nonlinear amplitude limiting characteristic of the amplitude limiting amplifier, so that Gbps-level transmission is realized, and the rate bottleneck of the traditional LED system is overcome. Complex transmitting end equalization is not needed, the design is simplified, the robustness is enhanced, and the stability requirement of a satellite-borne environment high-speed link is met.

The present invention provides a method and device for dynamic monitoring of microbubbles for blood purification. The method comprises: measuring the amplitude and frequency of an ultrasonic signal after it passes through a pipeline; calculating the flow rate of the liquid in the pipeline using a frequency difference method based on the measured frequency; determining whether bubbles exist in the pipeline based on the measured amplitude, and returning to the first step if no bubbles exist; if bubbles exist, classifying them according to their volume; when the bubble volume exceeds a limit, determining them as large bubbles and proceeding to the next step; when the bubble volume is below a limit, determining them as small bubbles and returning to the first step; and issuing an alarm when the flow rate of the liquid in the pipeline is greater than zero and large bubbles exist in the pipeline. The device comprises an ultrasonic detection module, a liquid flow rate test module, a waveform shaping module, a comparison module, a control module, and an alarm output module; only microbubbles in the flowing liquid are accumulated, thereby accurately measuring the microbubbles, achieving microbubble monitoring and alarming, and reducing false alarms.

The present invention provides a continuous shape correction method for online detection of metal corrugated compensators, and the shape correction method includes the following steps: S1, installation of the metal corrugated compensator. S2, initial inspection of the metal corrugated compensator. S3, preparation of the shape correction component. S4, shape correction of the metal corrugated compensator. S5, inspection after shape correction. S6, judgment of waveform shape correction. During shape correction, the shape correction method can completely match the waveform on the metal corrugated compensator with the supporting teeth on the support wheel. Each waveform on the metal corrugated compensator is detected by the detection component. After the unqualified waveform is detected, the shape correction component is controlled by the controller to correct the unqualified waveforms on the metal corrugated compensator in turn. After correction, the detection component is used to detect again to determine whether it is qualified, so as to ensure that the overall waveform after correction is a qualified waveform. Compared with the existing technology, the shape correction method saves manpower and material resources and improves the shape correction efficiency.

Since it is difficult to constantly monitor a large number of unused fiber optic transmission lines in an optical submarine cable system, a light source device according to the present invention includes: a light generation unit for generating amplified spontaneous emission light; a light control unit for controlling the band and power of the amplified spontaneous emission light and generating waveform shaping spontaneous emission light; and an optical branching unit for branching the waveform shaping spontaneous emission light into a plurality of branched light beams.

The invention relates to the technical field of ecological environment monitoring and natural resource asset evaluation, and discloses an ecological product value realization and accounting method based on VEP accounting. The method comprises the following steps: setting an ecological self-maintenance reference threshold in a digital grid model; performing time domain waveform shaping on the low-frequency remote sensing data by using the high-frequency environment driving factor, and reconstructing a high-frequency background value; constructing a geographic topological impedance matrix, and performing spatial weighted correction on the instantaneous deviation of the ground monitoring data based on the minimum cumulative resistance distance; a hysteresis comparison logic and a dead zone control mechanism are introduced, and effective output states exceeding a reference threshold value are screened; integral is carried out on the net physical quantity of the effective time period, and when the accumulated value reaches the standard transaction package quota, a digital warrant is generated. According to the method, through space-time dual reconstruction and steady-state screening, the problems of multi-source data frequency mismatch and complex terrain interpolation deviation are solved, and accurate quantification and digital circulation of the ecological overflow value are realized.

The utility model discloses a novel lightning arrester resistive current on-line monitoring device which comprises a valve plate type current sensor, a voltage waveform shaping module, a microprocessor module, a communication module, a power supply module, a display module and an electric energy quality chip. The output end of the valve plate type current sensor is connected with a current interface at the input end of the power quality chip; the input end of the voltage waveform shaping module is connected with the voltage output signal end of the PT cabinet; the output end of the voltage waveform shaping module is connected with an input end voltage interface of the power quality chip; the output end of the electric energy quality chip is connected with the input end I / O port of the microprocessor module; the input end of the communication module is connected with a communication interface at the corresponding end of the microprocessor module; the input end of the display module is connected with an I / O port of the output end of the microprocessor module; and the output end of the power supply module is connected with a corresponding power supply port of the microprocessor module. The novel lightning arrester resistive current on-line monitoring device has the advantages of being high in measurement precision, good in real-time performance, easy and convenient to operate and the like, can accurately reflect the performance state of a lightning arrester, and provides powerful guarantee for safe operation of an electric power system.

A combinatorial optimization problem processing device 100 comprises: a 1 × 2 Mach-Zehnder optical modulator 10 for receiving and modulating a polarization clock pulse train; an optical interference circuit 20 for receiving the polarization clock pulse train modulated by the 1 × 2 Mach-Zehnder optical modulator 10 and generating a predetermined interaction in an Ising model at a period of N pulses of the polarization clock pulse train; a modulating signal generation unit 40 for generating the modulating signal of the 1 × 2 Mach-Zehnder optical modulator 10 by waveform-shaping an electric signal obtained by photoelectrically converting an optical signal output from the optical interference circuit 20 and outputting a monitor signal representing the solution of an optimization problem to the outside; and an initialization control unit 30 for creating a neutral state for interaction between elements to initialize the optical interference circuit 20, by controlling the optical interference circuit 20 to reduce attenuation of the polarization clock pulse train input to the optical interference circuit 20. The combination optimization problem of the N elements is processed in association with the Ising model.

The invention belongs to the technical field of integrated circuits, and particularly relates to a level shift circuit applied to a three-phase motor driving chip. According to the circuit, the acceleration function of the high-voltage floating type level shift circuit is realized, and the digital logic gate circuit is used for carrying out waveform shaping on an output signal of the high-voltage floating type level shift circuit and realizing the acceleration function. The level conversion circuit part is a high-voltage floating level shift circuit, and output signals of the level conversion part are finally output by the level shift circuit through a small number of basic logic gates, high-threshold inverters, Schmitt triggers and master-slave RS triggers. The digital logic shaping circuit has the beneficial effects that the problem of overlarge time delay of the whole circuit caused by a Miller platform existing in output signals of a high-voltage floating type level shift circuit is solved, and meanwhile, the problem of waveform logic errors of the output signals caused by delay mismatching of input end signals of an RS trigger of a traditional digital logic shaping circuit is solved.

The present application relates to the technical field of communications. Disclosed are a data transmission method and a communication apparatus, which can reduce a symbol error rate in a data transmission process when signal dependent noise is considered to be used for designing a sending filter sequence. The method comprises: receiving first information, wherein the first information is used for indicating at least one of the intensity of signal dependent noise measured by a receiving end, and the ratio of the intensity of the signal dependent noise measured by the receiving end to the intensity of signal independent noise; and sending first data, wherein the first data is data formed by means of shaping a sending pulse forming waveform by a sending end, and the sending pulse forming waveform is determined on the basis of the first information. The embodiments of the present application are used for taking into consideration the impact of signal dependent noise on a sending filter sequence and a receiving filter sequence.

The application discloses a signal processing method, device, equipment, system, storage medium and product. The application performs partition processing on a to-be-processed signal output by a target signal after passing through a nonlinear device to obtain a plurality of first signal regions, wherein the target signal is related to an ideal signal; a preset type determination strategy is used to determine the region types to which the plurality of first signal regions correspond, wherein the preset type determination strategy is determined based on the steepness of a waveform shape; for each first signal region, a compensation strategy matched with the region type corresponding to the current first signal region is used to compensate and process a sub-signal in a corresponding region of the target signal in the current first signal region by using the ideal signal, to obtain a compensation signal corresponding to the current first signal region; and a pre-distortion signal corresponding to the ideal signal is determined according to the compensation signals corresponding to the plurality of first signal regions. The application can provide an effective pre-distortion signal for a signal with complex and changeable forms.

A system may include a therapy device including one or more therapy modules configured to couple to a patient. Each therapy module includes an array of radiation-emitting components, a waveform generator, and a processor coupled to the waveform generator and to the array. Each emitting component is configured to emit electromagnetic radiation in response to an electrical signal. The waveform generator is coupled to the array of radiation-emitting components and configured to generate one or more time-varying waveforms to drive the radiation-emitting components. The processor may be configured to select a protocol of a plurality of protocols. Each protocol may define one or more parameters including one or more of a waveform shape, an amplitude, a frequency, a timing parameter, and a duration parameter. The processor may be configured to send a signal to the waveform generator to generate the one or more time-varying waveforms according to the selected protocol.

The present application belongs to the technical field of physiological electrical signal detection, and particularly relates to a physiological electrical signal down-sampling method, which first divides the whole data of a physiological electrical signal into multiple buckets to obtain a set bucket, a front bucket and a rear bucket corresponding to the set data and the front data and the rear data of the set data; for the set bucket, a feature point is used as a sampling point of the set bucket; the first sampling point of the set bucket is used to iteratively obtain the sampling points of the front bucket in sequence; and the last sampling point of the set bucket is used to iteratively obtain the sampling points of the rear bucket in sequence. The waveform shape near the feature point is better retained, the amplitude and the latent period of the feature point after down-sampling are least affected, and the down-sampling distortion of a specific period can be effectively reduced for an induced electrical signal.

This invention relates to integrated circuit technology, specifically an on-chip aging detection circuit and an integrated circuit chip. The invention comprises a signal sampling and processing module, a voltage-controlled oscillator (VCO), and a Schmitt trigger module connected in series. The signal sampling and processing module outputs a temperature-dependent voltage signal to the VCO. The Schmitt trigger shapes the output waveform of the VCO. The VCO is composed of an odd number of identical inverters arranged sequentially. In adjacent inverters, the output of the preceding inverter is connected to the input of the following inverter; the output of the final inverter is connected to the input of the first inverter. This invention can detect the aging degree of a chip at different temperatures, with temperature having minimal impact on the detection results.

The utility model relates to an inductance transmitter, it includes the inductance sensor and signal acquisition and processing circuit of electric connection, signal acquisition and processing circuit includes the LC oscillation circuit, waveform shaping circuit, frequency division circuit and frequency voltage conversion circuit that electric connection in proper order, LC oscillation circuit includes triode Q1, waveform shaping circuit includes comparator U1, frequency division circuit includes the chip U2 of foot 11 node A's junction, frequency voltage conversion circuit includes chip U3, the utility model discloses reasonable in design, compact structure and convenient to use.

The application relates to an ultrasonic transducer self-checking circuit. The ultrasonic transducer self-checking circuit comprises an ultrasonic wave generating module, a self-checking control module and a waveform shaping module. The self-checking control module is used for generating a first enabling control signal, a second enabling control signal and a third enabling control signal based on a self-checking enabling signal and a self-checking clock signal. The ultrasonic wave generating module comprises an ultrasonic transducer, is connected with the self-checking control module and is used for generating ultrasonic waves based on the first enabling control signal and the second enabling control signal. The waveform shaping module is connected with the self-checking control module and the ultrasonic wave generating module and is used for obtaining a square wave signal. The self-checking control module is further used for comparing an aftershock count result with a diagnosis count result when the third enabling signal is at a high level, and generating an alarm signal when the comparison result is abnormal. The ultrasonic transducer self-checking circuit can realize self-checking of the ultrasonic transducer and can timely discover and alarm when the ultrasonic transducer is abnormal.

The application relates to a reflective optical fiber turbine oxygen supply flow detection and avionics conversion system and method, and belongs to the technical field of airborne oxygen supply detection and avionics bus. The system comprises the following: an optical fiber turbine oxygen supply flow detection unit, which is used for rectifying the oxygen supply airflow to be detected and then conveying the airflow to a turbine to drive the turbine to rotate, and collecting a periodic light pulse signal generated by the rotation of the turbine; a signal processing and conversion unit, which is used for converting the periodic light pulse signal into a voltage pulse signal and performing hierarchical processing, and obtaining a calibrated pulse signal after waveform shaping and proportional scaling; a bus conversion unit, which is used for measuring the frequency of the calibrated pulse signal, calculating an instantaneous oxygen supply flow value and converting the value into an ARINC429 protocol data frame; and a driving differential output circuit, which is used for converting the ARINC429 protocol data frame into a differential electrical signal of bipolar return-to-zero code and outputting the signal to an avionics bus network. The application can meet the urgent needs of high-performance aircraft for intelligentization and high reliability of an oxygen supply system.

The application discloses a common-mode conducted electromagnetic interference suppression circuit based on split inductors and split capacitors, which can be applied to a single-phase full-bridge inverter. The application splits input capacitors to construct a neutral point, splits output filter inductors and capacitors, and combines the neutral point to realize voltage clamping. Two auxiliary windings coupled with the split inductors induce a compensation voltage with the same waveform shape as the original noise source and proportional amplitude, and the compensation voltage is injected into an input DC bus through an injection branch composed of four compensation capacitors to counteract common-mode conducted electromagnetic interference in the converter. Under the condition that the filter inductors are ideally coupled with the auxiliary windings, the common-mode conducted electromagnetic interference in the converter can be almost completely counteracted; under the condition that the filter inductors are not ideally coupled with the auxiliary windings, more than 20dB of amplitude attenuation can be provided in the frequency range of 150kHz-5MHz. The components used in the application are all passive components, and the application has the advantages of low cost, small size and good effect.

This invention provides a portable NRD neural response signal generator, comprising: a shell, a display screen, a microcontroller control circuit board, side control buttons, and an input / output connector; the display screen shows the current amplitude of the neural response signal, the output status of the neural response signal, and the battery level; the microcontroller control circuit board acquires the output voltage signal of the electrodes of the cochlear implant and outputs a corresponding simulated neural response signal based on the output voltage signal; the side control buttons are used for power-on operation and selection and confirmation of the neural response signal waveform; the input / output connector is used for programming, battery charging, and signal output. This invention provides equipment support for verifying the accuracy of measuring neural response signals in cochlear implants, solving the problems of high signal interference and insufficient amplitude in existing general-purpose telemetry equipment for measuring neural responses; the waveform shape can be customized, the minimum output waveform amplitude reaches ±50μV, and the waveform is stable and free from external interference.

A head unit includes: a first pressure chamber and a second pressure chamber; a nozzle communicating with the first pressure chamber and the second pressure chamber; a first piezoelectric element configured to output a first residual vibration signal; a second piezoelectric element configured to output a second residual vibration signal; and a residual vibration signal acquisition circuit configured to acquire a composite residual vibration signal, in which the residual vibration signal acquisition circuit includes a waveform shaping circuit configured to output a shaped residual vibration signal obtained by shaping a signal waveform of the composite residual vibration signal, a first hold circuit configured to hold a maximum value of the shaped residual vibration signal, a second hold circuit configured to hold a minimum value of the shaped residual vibration signal, and a period signal output circuit configured to output a residual vibration period signal.

In certain examples, methods and semiconductor structures are directed to circuit-based apparatus in which an amplifier includes stacked, first and second circuit amplification stages to operate out of phase from one another for providing a push-pull operation, with each of the first and second circuit stages including a switching circuit and an impedance path to drive the switching circuit. The apparatus further includes a waveform-shaping circuit to shape, in response to each of the first and second circuit stages, a voltage signal for presentation to the switching circuit. As may be implemented in various more-specific examples, the apparatus may generate a constant output voltage with high efficiency across a wide range of resistive loads.

The invention discloses a deep geological environment temperature-liquid-gas multi-field coupling dynamic model test device and method, and the device achieves the partition temperature rise and temperature gradient construction through a temperature control module under the triaxial stress condition; the liquid seepage module and the gas loading module are mutually independent and can cooperatively form a flow / gas coupling loop; the dynamic loading system adopts two switchable or combined modes of drop hammer and flexible bag waveform shaping and servo hydraulic quasi-static / low-frequency loading. The monitoring system takes an FBG (Fiber Bragg Grating) sensor, an AE acoustic emission array attached to the inner wall of a loading frame and TDLAS (Tunable Diode Laser Absorption Spectroscopy) gas concentration monitoring as a core to realize nanosecond multi-mode signal synchronous acquisition. The device accords with a stress wave propagation and multi-field cooperative control theory, is feasible in structure, flexible in coupling and high in control precision, can highly restore a deep complex environment, and effectively overcomes the defects of difficult field coupling and poor boundary control of a traditional method, so that the test precision is remarkably improved, and the engineering risk is reduced.