102 results about "Ringing" patented technology

A circuit to suppress ringing in a Controller Area Network (CAN) bus having a CAN high (CANH) wire and a CAN low (CANL) wire is provided. The circuit may include processing circuitry to generate a CAN control signal, and a transconductance amplifier to receive a first input signal corresponding to the CAN control signal and a voltage signal from the CANL wire, and to generate an output current signal based on a difference between the first input signal and the voltage signal from the CANL wire. An output terminal of the transconductance amplifier may be coupled to the CANH wire to source current to or sink current from the CANH wire.

The invention belongs to the field of power distribution network traveling wave echo analysis, and particularly discloses a power distribution network traveling wave echo identification method based on time-frequency enhancement and multi-evidence fusion. The method comprises a closed-loop process of adaptive frequency band generalized S transformation, low-rank SVD time-frequency enhancement, double-threshold hysteresis starting point detection, physical template GLRT discrimination, double-peak fixed interval scanning and multi-band consistency rechecking. Firstly, a clear time-frequency energy diagram is obtained through preprocessing and self-adaptive frequency band S transformation, then power frequency and a slowly-changing background are suppressed through low-rank reconstruction, and then a candidate starting point is locked on a time energy track by adopting a hysteresis mechanism of'low-threshold triggering-high-threshold confirmation '; carrying out GLRT statistical discrimination in the candidate window by using single-peak / double-peak / damped ringing three types of physical templates, and quantifying time delay between peaks through fixed interval scanning when branch reflection exists; and finally, taking the energy consistency of the low / medium / high bands as cross-band physical evidence, and eliminating false detection only caused by high-frequency ringing.

The invention relates to the technical field of electric energy conversion, and discloses a high-frequency resonant topology-driven isolation power conversion system, which comprises a power conversion circuit, a driving unit, a feature sensing unit and a logic regulation and control unit, and is characterized in that the logic regulation and control unit extracts a parasitic ringing extreme point of a voltage evolution waveform in dead time; a charge release balance point is determined by calculating an arithmetic mean value of the first wave crest and the first wave trough, and high-frequency parasitic parameter interference is stripped; and predicting a time domain window of a return-to-zero potential based on a charge release balance point, performing phase compensation on a driving pulse in the time domain window according to a voltage waveform second derivative feature, and locking the starting moment of a switching tube at a zero voltage point. Interference of high-frequency distribution electromagnetic parameters on conduction judgment is eliminated, and soft switching self-healing in a full-load domain is achieved.

The invention relates to the technical field of systems for adjusting electrical variables, and discloses an automatic adjusting system for voltage fluctuation in an electroplating process, and the system comprises a feature extraction module which is used for obtaining an original sampling signal of voltage transient change of a controlled load end and extracting voltage differential information; the logic damping operation module is used for generating a logic compensation instruction according to the voltage differential information and a preset logic damping operator; and the pulse width modulation instruction reconstruction module is used for reconstructing a carrier phase and a placeholder edge time sequence according to the logic compensation instruction to correct the duty ratio. Virtual damping vectors with opposite polarities are implanted into a digital control loop, so that the output voltage generates a damping response which is subjected to exponential attenuation along with time to suppress transient voltage oscillation; according to the method, high-frequency ringing signals caused by coupling of parasitic parameters of the power transmission line and equivalent impedance of the controlled load are eliminated, and the voltage stability of the controlled load group during frequent switching of multiple task positions is guaranteed.

The invention discloses an anomaly positioning method and system for PWM signals output by power supply equipment, and relates to the technical field of power distribution systems.The method comprises the steps that firstly, edge waveforms of possibly existing high-frequency oscillation characteristics are collected, analyzed and screened out to serve as abnormal edge fragment waveforms, and the abnormal edge fragment waveforms are obtained by further screening out time periods when ringing signals are generated in a concentrated mode and energy attenuation is remarkable; and then, according to the time sequence and spatial distribution of the ringing concentration area, a possible physical path causing abnormal ringing can be effectively inferred. And finally, a plurality of abnormal signal transmission paths are further screened out, and an early warning is sent to a power supply equipment management system according to the abnormal signal transmission paths, so that related elements or lines are prompted to have structural defects or reflection mismatch problems caused by ringing excitation. According to the method, accurate extraction of transient ringing characteristics is realized, fusion analysis of time domain waveform characteristics and spatial structure parameters is effectively carried out, and the accuracy of abnormal signal positioning is greatly improved, so that the stability and reliability of power supply equipment are remarkably improved.

Techniques for valley detection in flyback power converters. In an example, circuitry implementing the techniques is configured to detect a positive slew at the onset of the leakage reset portion of the switching terminal signal, and to blank out the leakage reset portion. The circuitry is also configured to detect a negative slew of the leakage ringing portion of the switching terminal signal, and to blank out any false valley detections that occur during the leakage ringing portion. The blanking periods may be fixed or variable. The circuitry may also be configured to discern the difference between a true valley that reaches zero voltage within the magnetizing ringing portion and a false valley within the leakage ringing portion.

The application discloses a high-frequency resonant current characteristic measurement method and relates to the technical field of high-frequency electric characteristic measurement, and comprises the following steps: detecting a transient trigger signal and pausing power driving to create a measurement interval; in the measurement interval, passively collecting a natural ringing signal of a load, determining a current measurement paradigm in a passive ringing analysis paradigm and an active probe measurement paradigm based on the amplitude characteristics of the signal; and performing corresponding measurement actions according to the current measurement paradigm. The application realizes adaptive switching of the measurement paradigm by introducing a window environment diagnosis step before measurement, and solves the technical contradiction that the active probe is easily polluted by ringing and the passive measurement is easily invalid due to signal depletion.

Ultrasonic ranging systems and methods that use coding to distinguish emitted bursts from multiple transducers temporally stagger the bursts emitted from the transducers. The stagger delay between bursts from different transducers in a sensing frame can be randomized between different sensing frames to prevent blind zones. The stagger delay can be relatively small (e.g., between 3 ms and 10 ms) as compared to delays required between bursts in a single-tone ranging system (which would need to be more on the order of between 30 ms and 40 ms, depending on the maximum detecting range of the ranging system). The coding of bursts can be selected to utilize the entire bandwidth of the bursting transducer so as to preserve short-range sensitivity over transducer ringing. Schemes in which some transducers in a system only listen for bursts from other transducers but do not themselves burst within a sensing frame are also described.

The present invention relates to the field of integrated circuit technology, and more particularly to an LVDS transmitter with slew control. The present invention utilizes the characteristics of resistor and capacitor delay to output a portion of the data signal output by the LVDS circuit after a delay controlled by slew control resistors (RD1 and RD2) and the parasitic capacitance of the gate of the switch tube (M3 and M4). This process absorbs the external load resistor R L The reflection of the output signal (OUTN and OUTP) is then controlled to control the voltage swing of the output signal. On the one hand, the introduction of the slew control circuit does not increase the extra power consumption of the circuit. On the other hand, the introduction of the slew control circuit can improve the ringing phenomenon of the signal at the inversion point. Secondly, due to the use of a much larger than R L RCM1 and RCM2 thus avoid increasing the current flowing through the internal matching resistor, thereby reducing the power consumption of the transmitter. Ultimately, the present invention solves the ringing phenomenon while reducing the power consumption of the LVDS transmitter.

The embodiment of the invention provides a prompt tone playing method and a related device, and the method is applied to a calling side access network, and comprises the steps: distributing a first air interface resource for calling UE after media negotiation with a called side access network; sending resource reservation completion information to the called side access network; wherein the resource reservation completion information is used for the called side access network to send call confirmation information to the called UE after allocating a second air interface resource to the called UE; the call confirmation information is used for the called UE to send a prompt tone playing instruction to the called side access network; and receiving first ringing information which is sent by the network side based on the prompt tone playing instruction and represents a prompt tone playing mode, and instructing the calling UE to play corresponding first prompt tone data based on the prompt tone playing mode, thereby realizing a prompt tone playing function of a low-power communication system.

The application discloses a dynamic terminal resistance adaptive adjustment method, device, equipment and medium, and belongs to the technical field of industrial fieldbus communication. The method comprises the following steps: judging whether the current node is the physical end of the bus or not, disconnecting the terminal matching if the current node is not the end, and injecting a preset rising edge calibration pulse into the bus if the current node is the end; collecting a reflected signal generated by the calibration pulse on the bus, and recording waveform characteristic parameters including at least an overshoot amplitude and a ringing duration; according to the waveform characteristic parameters, iteratively adjusting a terminal resistance value by using a variable step strategy, increasing the resistance value when the overshoot amplitude exceeds a preset amplitude threshold, decreasing the resistance value when the ringing duration exceeds a preset time threshold, and stopping until a matching completion condition is met; and locking the optimal terminal resistance as the matching resistance value under the current communication mode. The application realizes automatic identification of the end node and closed-loop adaptive adjustment of the terminal resistance, and significantly improves the signal integrity and reliability of the bus communication.

To provide a signal processing device capable of suppressing generation of ringing itself and further improving gradation reproducibility.SOLUTION: A step waveform data generation unit (409) generates step waveform generation data having, for each horizontal scanning period, the data value corresponding to each display gradation and the temporal length corresponding to the number of pixels of each display gradation, for generating a step waveform signal, based on a gradation value of each display gradation and a start time of a display gradation period for each display gradation. A gradation conversion video data generation unit (410) generates gradation conversion video data, which is video data obtained by converting pixel values of the pixels in each horizontal scanning period of video data into dispersed pixel values corresponding to selection periods corresponding to the display gradations.SELECTED DRAWING: Figure 4

The invention discloses a design method of a buffer circuit for removing DC-DC switching node noise and a circuit, and relates to the technical field of switching power supply noise suppression, and the method comprises the steps: measuring the ringing frequency fr of a resonant circuit switching node; the method comprises the steps of determining a ringing frequency fr, determining a test capacitance Ctest by combining the ringing frequency fr, calculating a parasitic capacitance Cp according to the test capacitance Ctest, calculating characteristic impedance Z0 according to the parasitic capacitance Cp and the ringing frequency fr, further determining a buffer resistor Rsn, calculating a buffer capacitance Csn according to the parasitic capacitance Cp, and finally determining rated power PR of the buffer resistor Rsn according to the buffer capacitance Csn, an input voltage Vin and a switching frequency fsw. By quantizing the parameters of the RC buffer circuit, the higher harmonic noise of the switching node of the DC-DC converter is efficiently removed, and the additional power consumption is minimized.

Monitoring the status of a distance sensor operating by determining the transit time of electromagnetic waves includes: during operation, detecting an operating temperature of the distance sensor and determining an operating frequency spectrum of a ringing signal generated and detected at the operating temperature, wherein a reference frequency spectrum of a ringing signal generated and detected at a reference temperature in a good state of the distance sensor is stored in the distance sensor; determining an expected reference frequency spectrum from the operating temperature and the operating frequency spectrum determined at the operating temperature; comparing the reference frequency spectrum stored in the distance sensor with the expected reference frequency spectrum in a comparison step; determining a reference frequency spectrum deviation based on the comparing; determining a state deviation of the distance sensor from the reference frequency spectrum deviation; and signaling, at least indirectly, the state deviation.

Provided is an acoustic magnetic (AM) anti-theft system with which it is possible to widen the permissible range of a resonance frequency of a tag. The acoustic magnetic anti-theft system comprises a transmission unit 20, a tag 10, a reception unit 30, and a tag detection processing unit 42. The transmission unit 20 transmits a burst signal during a transmission period. The tag 10 resonates with the burst signal that is transmitted from the transmission unit 20, and outputs a ringing-down signal. The reception unit 30 receives the ringing-down signal during a reception period after the transmission period. The tag detection processing unit 42 detects the tag 10 on the basis of the ringing-down signal that is received by the reception unit 30. Each cycle includes a transmission period in which a burst signal in the 57 kHz band is transmitted and a transmission period in which a burst signal in the 58 kHz band is transmitted.

The invention discloses a ringing elimination method and device based on a time-frequency domain. The method comprises the following steps: acquiring an original received signal; filtering the original receiving signal to obtain a filtered original receiving signal; determining to construct an initial damping sine wave model according to transducer parameters and actual calibration data; optimizing the initial model parameters to obtain target model parameters; replacing initial model parameters in the initial damping sine wave model with target model parameters to obtain a target damping sine wave model; inputting the filtered original receiving signal into a target damping sine wave model to obtain a ringing signal; and subtracting the filtered original receiving signal from the ringing signal to obtain an echo reflection signal, and determining that ringing elimination is completed. Through the target damping sine wave model, the ringing signals of different ringing modes can be accurately output, that is, the ringing signals of a complex ringing mode can be accurately separated and eliminated, so that the purpose of accurately eliminating the ringing signals of the complex ringing mode is achieved.

The invention discloses a broadband high-gain flatness near-field tangential electric field probe integrated with a balance transition structure, and relates to the field of electromagnetic compatibility and electromagnetic field near-field testing. The probe is designed based on four layers of printed circuit boards, and at least comprises a coupling tip, a balance transition structure, a ferry edge structure, a signal via hole and a side plug-in connector. The hook type metal patch is connected to the twisted crossed dipole through the via hole array to form a capacitive loading effect, so that the sensitivity of the probe is improved; a balanced transition structure based on microstrip-slot transition converts differential mode current generated by the twisted and crossed dipoles into single-ended common mode output current, and the test is simplified; the edge transition structure based on Chebyshev gradual transition design reduces impedance mismatch between the balance transition structure and the side plug-in connector, and inhibits ringing ripples in probe frequency response. The tangential electric field probe disclosed by the invention has the advantages of wide frequency band, high gain flatness, low cost and the like, and is convenient for engineering popularization.

The present disclosure discloses a power stage of a multiphase switching converter that reliably detects a fault and includes a high side switch and a low side switch in series between a first power supply terminal and a ground terminal. The gate driver generates a drive signal to the two switches based on a control signal received from the phase controller. The fault logic block is powered by the second power supply terminal, and generates a binary bias signal indicating whether a corresponding fault exists by checking a state inside the power stage. When a control signal is switched between logic levels, ringing may occur at the ground terminal and the power supply terminal. The fault logic block generates a fault signal by sensing the deviation signal according to a delayed version of the control signal. Wherein the time amplitude of the delay is greater than the stable time of the ringing. By such delaying the sensing of the deviation signal, any interference of ringing can be avoided.

The present application relates to the technical field of circuit control, and particularly relates to a fast switching diode circuit control method for high-frequency signal processing, comprising: acquiring working temperature data, reverse recovery time data, ringing decay time data and frequency spectrum data; determining whether the diode thermal stability is qualified based on the junction zone transient temperature rise index, and determining the rising slope of the anode driving voltage according to the difference; when the high-frequency signal between the two ends of the diode reaches a preset switching threshold, the driving circuit switches the diode from the on state to the off state; determining whether the diode switching responsiveness is qualified based on the recovery speed representation parameter, and determining the adjustment of the off driving voltage according to the relative difference; determining whether the stability of the circuit signal processing is up to the standard based on the harmonic distortion characteristic value, and determining the adjustment of the off rate or the initial value of the anode driving voltage in the on state according to the ratio. The present application improves the stability of the fast switching of the diode circuit.

To surely prevent a normal mode from being restored from an energy saving mode by off-hook.SOLUTION: The ringer interrupt control unit 44 outputs the ringer interrupt signal S2 according to the ringer detection signal S1 when the off-hook detection signal S3 is not output (that is, in a state where the receiver of the external telephone 37 is put down), so that the mode control unit maintains the energy saving mode and does not switch to the normal mode even when the receiver of the external telephone is lifted and the off-hook signal is output (that is, even when the off-hook detection signal is output) in the energy saving mode. As a result, the mode control unit does not switch from the energy saving mode to the normal mode only by lifting the receiver of the external telephone, thereby preventing a decrease in energy saving efficiency.SELECTED DRAWING: Figure 2

The system according to the embodiment includes an analysis unit, a determination unit, and a ringing unit.The analysis unit analyzes the content of a telephone call. The determination unit determines, based on the content analyzed by the analysis unit, whether the call is a safe call. The ringing unit sounds a ringtone when the determination unit determines that the call is a safe call.

The application provides a conference audio merging method supporting dual-mode coexistence and synchronous ringing, and belongs to the technical field of audio processing. The method realizes real-time maintenance of the connection state of VoIP and eLink through a connection state monitoring unit, dual-mode incoming call signaling detection based on stable connection, synchronous ringing unified control, three-party conference through hardware mixing processing, and audio routing and optimization to improve sound quality. The method solves the problems of poor interoperability between existing VoIP devices and eLink software, inability to support three-party conference, complex operation and the like, realizes efficient conference audio merging under dual-mode coexistence, improves call efficiency and user experience, and is suitable for communication cooperation scenes in remote office.

Time-varying templates for improved short-range performance in ultrasonic ranging are disclosed. Ultrasonic ranging systems and methods that transmit a coded burst signal (802) and correlate converted acoustic echoes (808, 812, 816) of the burst signal (802) with a receive template that characterizes the burst code to determine time-of-flight information use a receive template of time-varying length to improve short-range object detection. The template length (810, 814, 818) is based on a time index measured from the start of transmission (804) of the burst signal (802). Detection can resolve a blind zone of transducer ringing (807) after the burst signal (802). A time-varying gain based on the time index can also be applied to the correlation signal. The length (810, 814, 818) and gain can be adjusted at a reduced time frequency to reduce computational cost.

The present invention provides a method for eliminating ringing artifacts in single-pixel imaging, belonging to the field of image filtering technology. The present invention uses a Butterworth low-pass filter to automatically eliminate the ringing artifacts from a single-pixel imaging spectrum graph containing ringing artifacts and reconstruct a higher-quality image. The present invention solves the problem that ringing artifacts exist in the reconstructed target scene of SPI at low sampling rates. The present invention can automatically eliminate ringing artifacts using only a Butterworth low-pass filter, which is more efficient than existing methods and provides a method for achieving high-quality SPI at low sampling rates.

The present invention discloses a method for generating a pulse signal, a pulse generating device, and a partial discharge measurement system, which relates to the technical field of signal generating devices, and solves the problems of relatively low pulse peak values of existing pulse generators and relatively large rise times of output pulses. The main technical solution is as follows: An AC signal source is obtained; the AC signal source is subjected to two-stage in-phase signal amplification processing to obtain an AC electrical signal; the AC electrical signal is successively subjected to rectification, voltage reduction, and delay processing to generate a pulse signal. The present invention performs signal amplification processing on the AC signal source to reduce the relative influence of external interference, obtains an AC electrical signal, and based on the subsequent rectification, voltage reduction, and delay processing, which play the roles of edge sharpening of the AC electrical signal, allowing the generation of narrow pulses to maximize the signal bandwidth, and reducing ringing, so that when the rise time of the pulse front decreases, the overshoot pulse peak value increases.

A signal processing method and device of a fast neutron detection device, electronic equipment and medium, which acquires a waveform signal output by a preamplifier of the fast neutron detection device and continuously samples to obtain a discrete sampling signal; determines a baseline mean, a baseline standard deviation and a slope standard deviation during the continuous sampling process, and determines an amplitude trigger threshold and a slope trigger threshold accordingly; jointly triggers through an amplitude condition and a slope condition to determine a trigger time; intercepts an event window from the cached signal based on the trigger time, and calculates event characteristics such as a peak amplitude, a rising edge slope, a pulse width characteristic, a negative polarity proportion and a zero-crossing number according to a signal amplitude sequence in the event window; discriminates the event characteristics according to a preset rule set and determines a comprehensive score to distinguish effective fast neutron events and false pulses; and outputs a fast neutron counting result according to the effective fast neutron events. The present application can reduce false triggering caused by microphone interference, ringing and baseline drift, and improve the reliability of the fast neutron counting result.

The invention discloses a WOA-VMD, PSR and AWMF-based multi-stage event maintenance type microseismic signal noise reduction method, and relates to the technical field of microseismic signal processing, and the method comprises the steps: obtaining an original signal; decomposing the original signal to obtain a plurality of intrinsic mode function (IMF) components; dividing the IMF component into a first component, a second component and a third component; noise reduction is carried out on the first component, the second component and the third component, and a preliminary noise reduction signal is obtained through reconstruction; performing phase-space reconstruction on the preliminary noise reduction signal, and performing noise reduction; filtering the IMF component; analyzing the event window, and smoothing a non-event window to obtain a final noise reduction signal; according to the method, the VMD decomposition process is automatic and can be reproduced, and the signal-to-noise ratio and the reconstruction precision are remarkably improved on the aspects of multiple types of synthetic signals and on-site micro-seismic signals; through combination of phase-space reconstruction and local SVD, residual coherent noise and random disturbance are effectively suppressed, and a main lobe structure and chaotic characteristics of a micro-seismic signal are maintained. And fine suppression of high-frequency noise and ringing is realized through wavelet-morphology combined filtering.

The application belongs to the field of interrupt control, and specifically discloses a control signal generation method and device for timing interrupt based on a second pulse. Through the application, the reception of a second pulse signal, the optimized shaping of a second pulse single-ended signal, the output of a second pulse effective indication signal, and the output of a second pulse absence indication signal are realized, and a precise control signal based on the second pulse for controlling a timing interrupt implementation circuit is generated. In application occasions with more signal defects, the application can eliminate the influence of ringing, noise, jitter, etc. on the second pulse single-ended signal, can meet the requirement of precise control of the external second pulse signal on the timing interrupt implementation circuit, can make the timing interrupt implementation circuit adapt to the mismatch between the local clock precision and the external clock precision, and can avoid the timing problems caused by the mismatch, and has good robustness and stable and reliable operation.

A circuit comprises a CAN bus line with two wires, an adaptive notch filter that is coupled to the CAN bus line and configured to filter a CAN signal received from the CAN bus line, and a CAN receiver. The circuit further comprises a first comparator circuit, a time-to-digital converter, and a digital control circuit. The first comparator circuit is coupled to the CAN bus line and configured to generate an output signal representing a ringing of the CAN signal. The time-to-digital converter is coupled to the first comparator circuit and configured to convert the output signal of the first comparator circuit into a digital word representing a frequency of the ringing. The digital control circuit is connected to the time-to-digital converter and configured to digitally control a frequency response of an adaptive notch filter based on the digital word.

The application discloses a SiC-CMC material fatigue failure early warning system based on STAF and R-CT combination, a STAF model carries out time domain signal difference reference combined with multistage filtering processing on received digital acoustic emission signals, and outputs effective damage information under a damage state; in the R-CT model, information is first processed by using R-type factor analysis method, the relationship between data quantity and factors in acoustic emission characteristic parameters is obtained, and thus comprehensive factor scores are obtained; based on and combined with dovetail mutation theory, characteristic information of transition points of damage states in the SiC-CMC material fatigue failure process is obtained. The application adopts time domain reference-multistage filtering technology, removes noise signals by comparing signal parameter differences of different time domain intervals, and further carries out multistage filtering on waveforms to remove noise signals in the waveforms. The comprehensive factor scores are obtained by carrying out factor analysis on ringing counts, energy and absolute energy of damage signals to carry out dovetail mutation calculation, and thus the life prediction and early warning of SiC-CMC structural fatigue damage are realized.