264 results about "Waveform shaping" patented technology

The invention provides a high-imaging-resolution method for identifying a lead sealing defect part of a cable, and relates to the field of nondestructive testing. Comprising the steps that a linear array probe array is utilized, a plurality of array elements emit ultrasonic waves to a to-be-detected defect part at the same time, and a received echo signal reflects the waveform shape and the waveform phase of the defect. A two-dimensional image is preprocessed through a synthetic aperture focusing technology, a combined image is reprocessed through a phase coherence technology, the quality and accuracy of the image are further improved, and a high-resolution three-dimensional image is constructed in combination with an imaging synthetic aperture focusing technology. The ultrasonic phased array technology, the SAFT technology, the phase coherence technology and the synthetic aperture focusing technology are combined, the imaging resolution is effectively improved, the method has remarkable advantages especially when defect parts in complex structures such as cable lead seals are recognized, the imaging quality is optimized, a two-dimensional image is converted into a high-resolution three-dimensional image, and finally an accurate defect recognition result is obtained.

The invention discloses a light beam focal length controllable system of a BOSA optical device and an implementation method thereof, relates to the technical field of optical communication, and solves the problems of focal length drift, light beam quality reduction and poor eye pattern quality caused by ambient temperature fluctuation in the prior art. Comprising a first focal length quality analysis module, a second focal length quality analysis module, an intelligent focal length adjustment module and a signal optimization module, the first focal length quality analysis module predicts future environment temperature change through a long-short term memory network, and plans an optimal focal length path in advance; the second focal length quality analysis module identifies light beam characteristic parameters by using a depth image identification algorithm, and performs multi-objective optimization in combination with an environment temperature change trend; the intelligent focal length adjustment module dynamically adjusts the focal length according to the optimization suggestion; the signal optimization module carries out waveform shaping and noise suppression by using a deep learning network, so that the eye pattern quality is remarkably improved; according to the invention, the focal length stability of the system is greatly improved, and the performance and reliability of the optical communication system are enhanced.

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.

The invention belongs to the technical field of laser application, and discloses a feedback type multi-wavelength optical fiber laser shaping and amplifying system which comprises a laser light source, an optical fiber frequency doubling device and a laser shaping and amplifying mechanism. The laser shaping and amplifying mechanism comprises a laser shaping and amplifying branch or more than two laser shaping and amplifying branches which are arranged in sequence; the laser shaping and amplifying branch comprises a feedback type laser shaping device and an optical fiber gain amplifying device; the optical fiber frequency doubling device is used for carrying out selective frequency conversion on fundamental frequency laser output by the laser light source; the feedback laser shaping device is used for carrying out waveform shaping on target wavelength laser; and the optical fiber gain amplification device is used for performing gain amplification on the shaped target wavelength laser. The device has the advantages of being simple in structure and high in expansibility, is suitable for being used in an optical fiber laser application system, and is used for modulating laser frequency, improving multi-wavelength laser waveforms and improving multi-wavelength laser output energy.

The invention provides a level shift circuit and electronic equipment, and relates to but is not limited to the technical field of integrated circuits, and the circuit comprises a level shift module which is used for outputting a first level signal according to a first input signal, and outputting a second level signal according to a second input signal; the duty ratio adjusting module is connected with the level shifting module and used for adjusting the duty ratio of the first level signal and outputting a third level signal, and adjusting the duty ratio of the second level signal and outputting a fourth level signal; and the waveform shaping module is connected with the duty ratio adjusting module, and is used for inverting the third level signal and outputting a fifth level signal, and inverting the fourth level signal and outputting a sixth level signal. The waveform duty ratios of the first level signal and the second level signal output by the level shifting module are adjusted through the duty ratio adjusting module, so that the output fifth level signal and sixth level signal can keep good duty ratios under different PVT and different working frequencies.

In certain examples, methods and circuit-based apparatuses are directed to use of logic circuitry to selectively engage (e.g., activating and / or deactivating) a plurality of resonant-isolated DC-DC converter cells ("converter cells"). The selective engagement of respective ones of the converter cells is to effect a combining of output signals from the converter cells to generate an aggregate (e.g., high-voltage) output signal having a waveform shape that is customized based on the selective engagement. In a more specific example, due to the inherent fast response of the converter cells, nanosecond level pulsing and customized high voltage waveshaping is achieved by controlling the precision timing, on the order of nanoseconds, of turning on or off the DC-DC converter cells and the voltage of each converter cell.

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 photoelectric conversion apparatus including a first substrate including a first semiconductor layer and a first wiring structure stacked on the first semiconductor layer, and a second substrate including a second semiconductor layer and a second wiring structure stacked on the second semiconductor layer, includes an avalanche photodiode arranged on the first semiconductor layer, a first resistive element arranged on the first substrate and connected to the avalanche photodiode, a waveform shaping portion arranged on the second semiconductor layer and configured to shape an output signal of the avalanche photodiode, and a second resistive element arranged on the first substrate and connected to the avalanche photodiode, the waveform shaping portion, and the first resistive element.

This waveform shaping device comprises a reception unit for receiving ultrasonic waves having a frequency that corresponds to a frequency control value and outputting a reception signal, and an analysis unit for generating a shaped reception signal obtained by synthesizing the reception signal and an adjustment signal in which the reception signal is delayed to adjust the level thereof. The analysis unit derives an evaluation value obtained by synthesizing and integrating the reception signal and a delay signal in which the reception signal is delayed by a delay time that corresponds to the frequency control value, and searches for a frequency control value at which the evaluation value is minimized. The analysis unit generates the adjustment signal on the basis of the delay signal corresponding to the frequency control value at which the evaluation value is minimized.

The present disclosure relates to a light reception element with which it is possible to perform inspection in a shorter time. Provided is a light reception element comprising a pixel array unit in which pixels are arranged in an array form, each of the pixels comprising an avalanche photodiode element, a waveform shaping circuit that shapes the output of the avalanche photodiode element into a pulse, and a counter circuit that counts a detection pulse outputted by the waveform shaping circuit or an inspection pulse outputted by an inspection pulse generation circuit, wherein the pixel has a determination circuit that determines whether the counter circuit is normal or not on the basis of a count value outputted from the counter circuit. The present disclosure can be applied, for example, to a light reception element in which a counter circuit for counting the number of photons is provided for each pixel.

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.

An antenna pattern includes a base material, and a dipole antenna formed in a band shape, made of a conductive material on a front surface of the base material, and extending linearly. The dipole antenna has a connection portion positioned in the middle of the dipole antenna in a longitudinal direction, and to which an IC chip is connected. A pair of long sides of the dipole antenna positioned at both ends of the dipole antenna in a width direction and extending in the longitudinal direction of the dipole antenna are formed in waveform shapes in which a plurality of concave and convex shapes are arranged in the longitudinal direction.

The invention relates to a head unit and a liquid ejecting apparatus. The head unit includes: an ejection unit that includes a piezoelectric element driven according to a drive signal and ejects a liquid according to the driving of the piezoelectric element; a waveform shaping circuit to which a first residual vibration signal corresponding to residual vibration generated by the drive signal is input and which outputs a second residual vibration signal obtained by shaping the waveform of the first residual vibration signal; a temperature detection circuit that outputs a temperature information signal corresponding to the temperature of the waveform shaping circuit; and a determination circuit configured to determine a state of the ejection unit, the waveform shaping circuit including: an amplification circuit configured to amplify the first residual vibration signal; and an amplification factor setting circuit that sets the amplification factor of the amplification circuit, the waveform shaping circuit outputs a second residual vibration signal based on the signal amplified by the amplification circuit, the amplification circuit and the amplification factor setting circuit constitute a single semiconductor device, and the determination circuit determines the state of the ejection unit based on the second residual vibration signal and the temperature information signal.

The present application provides a wave shaping circuit of a laser driving circuit, a laser driving circuit and a laser device, by attenuating the wave at the start of the pulse to a lower power, and then outputting the original pulse power after a delay, the laser relaxation oscillations disappears or occurs at a lower power of the light emission, with which the amplitude and probability of generation of the relaxation oscillations are reduced, thereby reducing the abnormal power at the moment of pulse operation and preventing the optical fiber from being overheated and damaged.

A state diagnosis system (101) can appropriately ascertain the state of a battery. A state diagnosis device (11) comprises a waveform approximation model processing unit (24) that acquires characteristic curve information (D25) for a battery (10) under measurement, a battery state estimation unit (30) that estimates the state of the battery (10) on the basis of the location within the characteristic curve information (D25) of a characteristic point that satisfies a prescribed condition, and a waveform parameter searching unit (44) that selects, and applies to waveform approximation model information (D28), a waveform parameter (D26) that corresponds to the battery (10) under measurement from a database (15) that stores, in association with a plurality of types of batteries (10), a plurality of waveform parameters (D26) for respectively determining the waveform shapes of characteristic curve information (D25) that corresponds to the types.

To suppress the surge voltage of the first surge voltage caused by square waves and the second surge voltage caused by harmonic frequency components, to broaden the frequency characteristics of the output of the switching amplifier and to make the output frequency variable.SOLUTION: A switching amplifier in push-pull configuration with narrow bandwidth filter on the output side comprises a partial resonance circuit to suppress the first surge voltage caused by square waves and a LCR series resonator to suppress the second surge voltage caused by harmonic frequency components, and the waveform shape of the drain-source voltage Vds of the switching element is a trapezoidal waveform.SELECTED DRAWING: Figure 1

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.

A power conversion device (1) that performs power conversion comprises one or more switching devices that are included in at least one power converter among one or more power converters that perform power conversion, a waveform shape alteration unit (340) that can alter the waveform shape of a switching waveform of the switching devices, state quantity detection units (501–505) that detect a state quantity that indicates the operating state of the power conversion device (1), and a waveform shape setting unit (420) that sets the waveform shape of the switching waveform of the switching devices in accordance with the state quantity when the switching waveform of the switching devices is to be altered by the waveform shape alteration unit (340). The switching loss of the switching devices is equal to or greater than the conduction loss of the switching devices.

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.

To provide a head unit of which discharge part state determination accuracy is improved.SOLUTION: A head unit comprises: a discharge part which includes a piezoelectric element driven by a driving signal, and discharges liquid in response to drive of the piezoelectric element; a waveform shaping circuit to which a first residual vibration signal in response to residual vibration generated by the driving signal is inputted and which outputs a second residual vibration signal in which the waveform of the first residual vibration signal is shaped; a temperature detection circuit which outputs a temperature information signal in response to the temperature of the waveform shaping circuit; and a determination circuit which determines the state of the discharge part. The waveform shaping circuit has an amplifier circuit for amplifying the first residual vibration signal and an amplification factor setting circuit which sets an amplification factor of the amplifier circuit, and outputs the second residual vibration signal based on a signal amplified by the amplifier circuit. The amplifier circuit and the amplification factor setting circuit are configured as one semiconductor device, and the determination circuit determines the state of the discharge part on the basis of the second residual vibration signal and the temperature information signal.SELECTED DRAWING: Figure 19

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.

The present invention discloses a frequency-adaptive alignment method for multiple homologous waveforms, including: collecting relay protection devices and fault recorder waveform files generated by the same system disturbance or fault; the minimum sampling frequency of each waveform is set as the reference frequency, and the waveform of the non-reference frequency is resampled; the analog channel with a change characteristic before and after the zero moment in the reference waveform is selected; the sampling point deviation between the waveform to be aligned and the reference waveform and the required moving angle are obtained according to the absolute value and the minimum difference of the analog channel sampling value between the waveforms as the criterion; all analog channels in the waveform to be aligned perform waveform interception and waveform movement according to the sampling sequence number deviation, and complete the alignment of different waveforms under the same time coordinate. The present invention enhances the adaptability of the waveform alignment method to the system frequency and the adaptability of the waveform morphology, improves the accuracy of waveform alignment under different working conditions of the power grid, and has better engineering application capabilities.

The first surge voltage caused by a square wave and the second surge voltage caused by a harmonic frequency component are suppressed, and the frequency characteristic of the output of the switching amplifier is made broadband and the output frequency is made variable. [Solution] A switching amplifier having a push-pull configuration with a narrow-band filter on the output side is provided with a partial resonant circuit that suppresses a first surge voltage caused by a square wave and an LCR series resonant element that suppresses a second surge voltage caused by a harmonic frequency component, and the waveform shape of the drain-source voltage Vds of the switching element is made trapezoidal.

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.

A transmitter (1; 21) is disclosed for wirelessly transmitting an amplitude modulated data signal (2) in a radio frequency field (3) to a receiver (4) of a radio frequency identification communication system (5; 22). The transmitter (1; 21) comprises: a wave generator (6) for generating a carrier signal (7) having a specific frequency and waveform; a modulation stage (15) for modulating the carrier signal (7) with respect to the data signal to be transmitted; an antenna (11) connected to the modulation stage (15) or the wave generator (6) via an amplifier (9) and a matching circuit (10) for wirelessly transmitting the amplitude modulated data signal (2) in the radio frequency field (3), characterized in that the transmitter (1; 21) further comprises a shaping stage (16) connected to the wave generator (6) for selecting the waveform of the carrier signal (7) directly or indirectly depending on the data signal.

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.