44 results about "Skew" patented technology

The invention provides an axial skewed pole motor eccentricity detection method based on asymmetric layered Hall, and the method comprises the following steps: respectively installing a first group of linear Hall sensors and a second group of linear Hall sensors on a first axial layer and a second axial layer of a stator notch of an axial skewed pole motor in an asymmetric manner; after analog-to-digital conversion is carried out on the voltage signals detected by the linear Hall sensor, a pair of orthogonal third harmonic sinusoidal signals is obtained through grouping signal superposition, and the eccentric direction is determined; and based on a complex factor filter and a synchronous reference system phase-locked loop, extracting amplitudes of a positive sequence signal, a negative sequence signal and a sideband signal from the third harmonic sinusoidal signal, and further calculating a static eccentricity rate and a dynamic eccentricity rate. According to the axial skewed pole motor eccentricity detection method, two groups of linear Hall sensors are mounted in a layered and asymmetric manner, so that the eccentricity detection sensitivity and precision are effectively improved, the eccentricity state change in the motor operation process can be quickly responded, and the dynamic and static eccentricity rates and the eccentricity direction are output.

The application discloses a method for compensating internal skew of a differential via channel, comprising the steps of: calculating skew time between differential signals; using obtained material parameters to establish a model of a PCB and a differential via; simulating the established high-precision differential model to obtain S parameters of the differential via structure through simulation; obtaining S parameters and differential internal skew values of a design measurement to calibrate a scale factor of 3D modeling; optimizing stub length difference h in the differential via structure; comparing whether the optimization result meets a design allowed differential internal skew target value, if yes, optimization is completed, and if not, stub length difference h is continuously optimized. The application occupies small layout and wiring space, and the proposed differential via structure compensates for skew of differential phase in time, effectively avoiding the influence of internal skew.

A method for estimating the statistical characteristic parameters of ice-source noise sound pressure belongs to the field of underwater acoustic signal processing technology. The statistical characteristic parameters include a characteristic exponent α, a scale parameter γ, a skew parameter β, and a location parameter δ. The method includes: 1) basic theoretical analysis of the α-stable distribution; 2) estimation of the scale parameter γ; 3) calculation of the characteristic function point ω; 4) estimation of the characteristic exponent α; 5) estimation of the skew parameter β; and 6) estimation of the location parameter δ. A statistical characteristic parameter estimation method model is constructed based on the α-stable distribution theory to achieve rapid estimation of the four statistical characteristic parameters of ice-source noise sound pressure with non-stationary and impulsive characteristics. The value of the second characteristic function point is determined by the estimated result of the scale parameter. The skew parameter is estimated by selecting different estimation formulas based on the size of the characteristic exponent. This method is applicable to both skewed and symmetric α-stable distributions, has high estimation accuracy, and does not require a quantile table, making the calculation simple.

The present disclosure is a parallel signal transmission system comprising: a transmission device that transmits a parallel signal by using a wavelength-multiplexed signal; a reception device that receives the wavelength-multiplexed signal from the transmission device and outputs the parallel signal; and a wavelength switching unit that is connected between the transmission device and the reception device and that changes at least one of the transmission wavelengths of the parallel signal so as to reduce the skew of the parallel signal in the reception device.

The invention relates to the technical field of integrated circuit verification, in particular to a queue-based clock frequency deviation monitoring device, which comprises an initialization module used for setting module-related initialization data; the clock event capturing module is used for monitoring the edge of a clock signal in real time and obtaining the accurate simulation time of the moment; the queue management and reference model module is used for storing timestamp information into a dynamic queue as required; the comparison and report module is used for obtaining the size of the queue, comparing the size of the queue with the alarm upper limit and the alarm lower limit in real time and outputting a corresponding report according to a comparison result, the dynamic distribution and efficient operation characteristics of the SystemVerilog queue are utilized, clock events are stored and processed in real time, long-time and multi-clock-domain continuous monitoring is supported, and the real-time performance of the system is improved. An efficient, reliable and low-cost solution is provided for clock verification of a modern digital integrated circuit, and verification completeness and automation level are greatly improved.

A transport device includes a skew correction unit configured to correct skew of a medium by colliding with the medium and a buffer unit provided with a contact portion configured to come into contact with the medium between a first transport unit transporting the medium to the skew correction unit and the skew correction unit in a transport direction. The buffer unit is configured such that a second transport velocity is lower than a first transport velocity, the first transport velocity being a transport velocity of the medium upstream of the buffer unit in the transport direction, the second transport velocity being a transport velocity of the medium when the medium collides with the skew correction unit after coming into contact with the contact portion. The buffer unit is configured such that the contact portion does not collide with the medium strongly enough to correct the skew of the medium.

The application relates to the field of radio astronomy signal processing, and discloses a radio frequency interference reduction method and device for a phased array radio telescope, wherein the method comprises the following steps: acquiring relative position information of a plurality of navigation satellites, determining potential interference satellites from the plurality of navigation satellites according to the relative position information; acquiring a wideband signal collected by the phased array radio telescope, and determining a plurality of interfered subbands in the wideband signal; matching the interfered subbands with the potential interference satellites, and determining subband interference information of the interfered subbands according to a matching result; acquiring a signal subspace and an interference subspace of the interfered subbands, and then determining a skew projection matrix of the interfered subbands; and simultaneously performing interference reduction and digital beam forming on the interfered subbands according to the skew projection matrix and the signal subspace. The technical scheme provided by one or more embodiments of the application can realize continuous interference reduction of the phased array radio telescope on the in-orbit satellites.

The application provides a minimum phase channel skew correction method and device, electronic equipment and storage medium, and relates to the technical field of communication.The application first acquires training result data corresponding to each line pair of a plurality of line pairs of a target communication system in a training mode, wherein the training result data includes a tap coefficient sequence of a DFE and a received symbol sequence; the plurality of line pairs include a reference line pair and a plurality of to-be-corrected line pairs; then, based on the tap coefficient sequence corresponding to each line pair and a preset cross-correlation operation algorithm, timing offset data is determined; further, based on the timing offset data and the received symbol sequence corresponding to each line pair, the receiving order of each line pair is determined, so as to correct the skew of the target communication system in a data transmission mode based on the timing offset data and the receiving order of each line pair. In this way, skew correction with low complexity and high reliability is realized, the skew correction can be quickly completed in the starting stage, and the accuracy of data transmission is ensured.

A circuit is disclosed that includes timer interleaved (TI) analog-to-digital converter (ADC) circuitry that generates a digital output signal. Correction circuitry receives the digital output signal from the TI ADC circuitry and uses weight values to generate a corrected output signal to correct for time skew. The correction circuitry includes a derivative filter that removes a frequency dependency between the weight value and an input signal to the TI ADC circuitry. Weight update circuitry receives the correction output signal and generates an updated weight value for the correction circuitry. The weight update circuitry includes a notch filter that suppresses spectral content in the corrected output signal to eliminate spurious dependencies during a weight update process.

To provide a composite cable with a small outer diameter and reduced skew. [Solution] The composite cable 1 comprises a bundled core 3 formed by twisting together multiple stranded wires 2 in multiple layers, and a sheath 6 that covers the bundled core 3. The bundled core 3 includes multiple types of stranded wires 2, and the stranded wires 2 include quad stranded wires 21 formed by twisting together two pairs of differential signal lines 210 that transmit differential signals, and multiple quad stranded wires 21 are included in one layer of the bundled core 3.

A divider circuit is disclosed. The divider circuit includes a pair of differential latch circuits. The divider circuit receives complementary clock signals as a pair of differential signals. The divider circuit generates frequency divided signals based on the complementary clock signals, inverted versions of the complementary clock signals, and input signals. The frequency divided signals may be substantially ripple-free. Further, the frequency divided signals remain substantially ripple-free in a presence of the skew between the complementary clock signals.

As the timing-based servo (TBS) patterns of the first and second servo bands rotate, the heights of the upper and lower portions of the servo stripes of the servo frames of the TBS patterns are adjusted to compensate for the change in the usable height of the servo stripes caused by the rotation.

The apparatus includes a clock skew calibration circuit configured to be coupled to the multi-phase clock generator via a plurality of delay lines, wherein the first clock skew calibration unit comprises: a frequency multiplier configured to receive a plurality of multi-phase clock signals and to generate a clock signal based on the plurality of multi-phase clock signals; a frequency divider configured to receive the clock signals and to generate a reduced frequency signal based on the clock signals; and a delay line control circuit configured to compare a duty cycle of the reduced frequency signal with a predetermined duty cycle and to generate a first control signal to adjust the skew of the first multi-phase clock signals by adjusting a first delay applied to the first multi-phase clock signals until a calibrated signal of the first multi-phase clock signals is achieved.

Disclosed are integrated circuit structures with buried rails and backside metals for routing input signals to and / or output signals from one or more cells of the integrated circuit structures. Port landing-free connections to input ports and / or from output ports are enabled. As a result, signal routing flexibility is enhanced.

The application belongs to the technical field of optical fiber communication, and proposes a receiver IQ skew measurement method and system based on frequency domain reorganization ZC sequence, comprising: generating ZC sequence based on two different root indexes for the training sequence of the transmitting end; calculating the real part and the imaginary part of the ZC sequence based on orthogonal frequency domain time-frequency transformation, reorganizing the sequence based on the real part and the imaginary part, and taking the reorganized ZC sequence as the training sequence of the transmitting end; and based on the frequency domain, block the received sequence signal, perform conjugate summation on adjacent frequency domain sub-blocks, solve the phase angle based on the summation result, and obtain the IQ skew based on the phase angle. Compared with the prior art, the application reduces the calculation complexity of error solving.

A system for altering an input / output (I / O) data signal of a NAND programming operation includes a skew-gen circuit comprising: a delay block coupled to an input of a two input logic OR gate, and a MUX logic gate coupled to an output of the logic OR gate. The skew-gen circuit is configured to: alter the pulse width of a input data signal by increasing the width of the data high signal and decreasing the width of the data low signal; and output the altered data signal to the MUX, the MUX configured to select either the altered data signal or the input data signal depending on the mode.

To provide a circuit board in which a signal line pair with a broadside coupling structure is arranged on an inner layer of the circuit board, and which can reduce skew between two points where the signal line pair is connected while making effective use of one surface of the circuit board.SOLUTION: A circuit board on which a transmission line consisting of a signal line pair 3 is formed, the signal line pair 3 being first signal lines 3a1, 3a2 and second signal lines 3b1, 3b2 in a broadside coupling configuration arranged on at least two or more inner layers, the first signal lines 3a1, 3a2 and second signal lines 3b1, 3b2 each connecting two points P1, P2 and having an intersection 4 that alternates one or more times between the two points P1, P2.SELECTED DRAWING: Figure 3

A technique for signal skew correction in an integrated circuit memory device is described. The integrated circuit memory device includes a first interface for receiving command / address (CA) signals and a clock signal, a data interface, and a mode register. During a CA bus loopback mode, the first interface receives a pattern of the CA signals and the clock signal, and the data interface outputs a pattern of the CA signals. During the CA bus loopback mode, the mode register can be programmed with a value representing a timing offset between the clock signal and a sampling point of the first interface.

The invention discloses a subsynchronous oscillation mode identification method and device based on SMSST-CDSSI, and the method comprises the steps: employing a ridge extraction method, screening out a time-frequency coefficient representing each subsynchronous oscillation component according to the energy of the time-frequency coefficient in each second-order multiple synchronous compression transformation coefficient matrix, and obtaining an optimal instantaneous frequency track; performing time domain reconstruction of each oscillation mode according to the optimal instantaneous frequency trajectory; the method comprises the following steps: constructing a state space model of an n-order system according to input and output signals of a power system and considering deterministic and random noise, and constructing a corresponding Hankle matrix according to input and output variables; performing LQ decomposition on the input / output Hankel matrix to calculate an oblique projection matrix Oi; and performing singular value decomposition on the oblique projection matrix Oi, calculating a state matrix A of a discrete system, performing eigenvalue decomposition on the state matrix A, solving a discrete eigenvalue of the state matrix A, and solving the frequency fi and the modal damping ratio xii of the subsynchronous oscillation according to the relationship between the discrete system and the continuous time system. The device comprises a processor and a memory.

The invention belongs to the technical field of optical fiber communication, and provides a receiver IQ skew measurement method and system based on a frequency domain recombination ZC sequence, and the method comprises the steps: generating a ZC sequence for a training sequence of a transmitting end based on two different root indexes; calculating a real part and an imaginary part of the ZC sequence through time-frequency transformation based on an orthogonal frequency domain, performing sequence recombination based on the real part and the imaginary part, and taking the recombined ZC sequence as a training sequence of a transmitting end; the method comprises the following steps of: partitioning a received sequence signal based on a frequency domain at a receiving end, performing conjugate summation on adjacent frequency domain sub-blocks, solving a phase angle based on a summation result, and obtaining IQ skew based on the phase angle. Compared with the prior art, the method has the advantage that the calculation complexity of error solving is reduced.

The invention discloses a branch deflection damage measurement method, device and equipment of a coherent optical communication system and a storage medium, and relates to the technical field of coherent optical communication, and the method comprises the steps: generating an emission training sequence of each signal transmission processing dimension based on a preset real number sequence, the emission training sequences on different signal transmission processing dimensions have different cyclic shift amounts; after it is detected that a transmitting end transmits a transmitting training sequence to a receiving end, a receiving training sequence, received by the receiving end, of each signal transmission processing dimension is obtained, and the receiving training sequence is obtained after the transmitting training sequence is subjected to transmitting end branch damage, optical fiber transmission damage and receiving end branch damage; reversely deriving a damage matrix based on the received training sequence; and based on the transmitting end skew component and the receiving end skew component separated from the damage matrix, determining transmitting end branch skew damage and receiving end branch skew damage. Through the method, the IQ deflection of the transmitting end and the receiving end can be synchronously separated and estimated in single measurement, and the efficiency is improved.

A sequence pattern generation device that can control skew between lanes of a plurality of lanes by controlling a transmission start timing of a sequence pattern of a plurality of outputs. The sequence pattern generation device includes a primary module 2 and a secondary module 3 each having two outputs of data signals, and a device control unit 16 that, in a case where a start of a sequence of the outputs of the data signals is synchronized, sets delay amounts, aligns phases of clocks of the primary module 2 and the secondary module 3, locks phases of clocks of a primary data generation unit 26 of the primary module 2 and a secondary data generation unit 36 of the secondary module 3, and starts the sequence with the delay amounts set in the primary data generation unit 26 and the secondary data generation unit 36.

The invention provides a time offset signal calibration method for a high-speed time-interleaved analog-to-digital converter. The method comprises the following implementation steps: acquiring a training sample set and a test sample set; constructing a time offset signal calibration network model and carrying out iterative training on the time offset signal calibration network model; and obtaining a time offset signal calibration result. In the process of training a time offset signal calibration network model and obtaining time offset signal calibration results, a full connection module carries out various calibration mapping on time offset signals, and a weighted summator carries out weighted summation on a plurality of preliminary calibration results output by the full connection module based on weight vectors output by a weight generation network. The defect that in the prior art, a single full-connection layer is adopted to conduct calibration mapping on the feature map, and consequently the feature map is difficult to adapt to time offset signals with complex and changeable high-frequency region features is overcome, and the problem that the high-frequency region calibration effect is reduced is solved.

An electronic apparatus includes an alignment unit and a control unit. The alignment unit includes: an alignment roller that supplies a recording medium to a processing unit that performs processing on the recording medium; and a correction motor capable of operating the alignment roller to correct the offset of the recording medium. The control unit drives the correction motor using a first pulse signal having a first frequency, and then drives the correction motor using a second pulse signal having a second frequency lower than the first frequency. And a frequency at which a vibration component having a phase opposite to that of the vibration of the alignment unit can be applied to the alignment unit.

A technique for synchronizing a secondary clock (100; 800; 900; 1091; 1092; 1130) with a primary clock (300) is provided. As to a first method aspect, a method comprises a step of receiving (202), from the primary clock (300), a synchronization signal (302) indicative of a reference time at each of a plurality of synchronization events. The method further comprises a step of estimating (204) an offset and a skew of the secondary clock (100; 800; 900; 1091; 1092; 1130) based on the reference time and a local time retrieved from the secondary clock (100; 800; 900; 1091; 1092; 1130) for each of the synchronization events. The offset and the skew of the secondary clock (100; 800; 900; 1091; 1092; 1130) are estimated (204) using a Kalman filter, KF, comprising an offset variance and a skew variance. The offset variance being indicative of a power of noise of the offset and the skew variance being indicative of a power of noise of the skew. The offset variance is set according to an internal noise power measured for the secondary clock (100; 800; 900; 1091; 1092; 1130). The skew variance is set according to an external influence on the secondary clock (100; 800; 900; 1091; 1092; 1130) measured for an environment of the secondary clock (100; 800; 900; 1091; 1092; 1130). The method further comprises a step of updating (206) the secondary clock (100; 800; 900; 1091; 1092; 1130) based on the estimated (204) offset and skew.

The invention aims to provide a local descriptor generation method based on a time-frequency fusion module and skewness self-adaption, which comprises the following steps of: constructing a feature extraction network based on a time-frequency fusion convolution module, and generating a feature descriptor from an input image block; obtaining training data, and organizing the feature descriptors into a triple; constructing a self-adaptive weighted triple loss function based on skewed distribution, and obtaining the total loss of the training data by using the self-adaptive weighted triple loss function; performing back propagation according to the total loss, and dynamically adjusting and updating the parameter weight of the feature extraction network based on the time-frequency fusion convolution module through an optimizer to obtain an optimized feature extraction network; and generating a local descriptor by using the optimized feature extraction network. According to the method, the local image descriptor with stronger discriminant ability, better robustness and better matching performance can be generated.

The invention relates to the field of radio astronomical signal processing, and discloses a radio frequency interference reduction method and device for a phased array radio telescope, and the method comprises the steps: obtaining the relative position information of a plurality of navigation satellites, and determining potential interference satellites in the plurality of navigation satellites according to the relative position information; the method comprises the following steps: acquiring a broadband signal acquired by a phased array radio telescope, determining a plurality of interfered sub-bands in the broadband signal, matching the interfered sub-bands with a potential interference satellite, and determining sub-band interference information of the interfered sub-bands according to a matching result; and acquiring a signal subspace and an interference subspace of the interfered sub-band, further determining a skew projection matrix of the interfered sub-band, and performing interference reduction and digital beam forming on the interfered sub-band according to the skew projection matrix and the signal subspace. According to the technical scheme provided by one or more embodiments of the invention, the continuous interference of the phased array radio telescope on an on-orbit satellite can be reduced.

The present disclosure relates to a UCIe receiving end skew calibration method, device and chip, the method comprising: determining minimum phase interpolation and maximum phase interpolation of a clock signal in the case that a UCIe receiving end correctly receives data from a UCIe sending end based on preset minimum skew value and preset maximum skew value of data link skew coding of the UCIe receiving end; obtaining skew calibration value of the data link skew coding of the UCIe receiving end in the case that the clock signal adopts optimal phase interpolation according to the preset minimum skew value, the preset maximum skew value, the minimum phase interpolation, the maximum phase interpolation and the optimal phase interpolation of the clock signal. The present disclosure helps to solve the problem that the real optimal line delay point on the UCIe receiving end side is ignored due to the nonlinearity between the data link skew coding and the line delay, and helps to improve the robustness of data transmission.

The invention provides an anti-oblique-insertion high-mechanical-stability high-frequency connector, which effectively avoids oblique insertion, ensures smooth butt joint of a contact pin and a jack, and remarkably improves the assembly efficiency and the connection reliability. And a complete shielding layer and impedance matching design is kept, high-frequency signal transmission as high as 20GHz is supported, and the performance is stable. The connector is a female end, and is characterized by comprising an integrated housing structure; a center terminal; the insulator comprises a front positioning cavity and a rear stripped cable positioning cavity, and the front positioning cavity is used for placing the central terminal; the integrated shell structure comprises an insulator positioning and placing cavity, a middle crimping part and a tail cable crimping part which are arranged on the front part in a manner of copying the shape of the insulator; and the insulator positioning and placing cavity, the middle crimping part and the tail cable crimping part are integrally manufactured to form an integral structure.

An apparatus may comprise a skew detection circuit to sample a common mode voltage of a differential signal, wherein the sampled common mode voltage is indicative of an amount of skew between a first signal of the differential signal and a second signal of the differential signal; and a skew compensation circuit to adjust a delay of the first signal or the second signal based on the sampled common mode voltage to reduce the amount of skew.