公开(公告)号：US06407684B1

公开(公告)日：2002-06-18

申请号：US09901644

申请日：2001-07-11

申请人： Kurt Schmidt

发明人： Kurt Schmidt

IPC分类号： H03M148

CPC分类号： G01R23/12 ,  H03H17/0286

摘要： A frequency estimator for estimating the frequency of a digital input signal (x(k)) includes a phase detection device (2) for determining the phase (&phgr;(k)) of the input signal (x(k)), a differentiator (3) for generating the phase difference (&phgr;diff1(k)) between adjacent samples of the phase (&phgr;(k), &phgr;(k-1)) and a filter (4) for averaging the phase difference (&phgr;diff(k)) and having a trapezoidal pulse response (hM(k)). The trapezoidal pulse response (hM(k)) is generated by superimposing a first triangular pulse response with a second triangular pulse response which is offset in time with respect to the first triangular pulse response.

摘要翻译： 用于估计数字输入信号（x（k））的频率的频率估计器包括用于确定输入信号（x（k））的相位（phi（k））的相位检测装置（2），微分器 3）用于产生相位（phi（k），phi（k-1））的相邻采样和用于对相位差（phidiff（k））进行平均的滤波器（4）之间的相位差（phidiff1（k））和 具有梯形脉冲响应（hM（k））。 梯形脉冲响应（hM（k））通过将第一三角形脉冲响应与相对于第一三角形脉冲响应在时间上偏移的第二三角形脉冲响应叠加而产生。

公开(公告)号：US5299231A

公开(公告)日：1994-03-29

申请号：US810217

申请日：1991-12-19

申请人： Franco Guglielmi ,  Arnaldo Spalvieri

发明人： Franco Guglielmi ,  Arnaldo Spalvieri

IPC分类号： H04L27/00 ,  G01R23/12 ,  H04L27/18 ,  H04L27/227 ,  H04L27/22

CPC分类号： H04L27/2273 ,  G01R23/12 ,  H04L2027/0067

摘要： A method of estimating the carrier frequency of a numeric signal, in which two estimates of the carrier phase are carried out in successive instants of time and the estimated carrier frequency is obtained from the comparison of the above two estimates. The invention also concerns a device for implementing the method, the device including a circuit for estimating the phase of the signal at successive instants in time, a circuit for storing the estimates, and a circuit for comparing the estimates. In a preferred embodiment, both the phase estimator and the comparison circuit are implemented by multipliers and adders.

摘要翻译： 一种估计数字信号的载波频率的方法，其中载波相位的两个估计在连续的时刻进​​行，并且从上述两个估计的比较中获得估计载波频率。 本发明还涉及一种用于实现该方法的装置，该装置包括用于估计在连续时刻的信号的相位的电路，用于存储估计的电路，以及用于比较估计的电路。 在优选实施例中，相位估计器和比较电路都由乘法器和加法器实现。

公开(公告)号：US5019823A

公开(公告)日：1991-05-28

申请号：US446543

申请日：1989-12-05

申请人： David R. Bream ,  Stephen J. Roome

发明人： David R. Bream ,  Stephen J. Roome

IPC分类号： G01R23/12

CPC分类号： G01R23/12

摘要： An apparatus for measuring the frequency of an input signal is described. The apparatus uses a quadrature sampling system to obtain values of the instantaneous phase of the signals at a succession of time intervals, the values being converted into cumulative phase values. An estimate of the frequency is obtained by determining the gradient of the straight line which would best pass through a plot of the values of cumulative phase against time.

公开(公告)号：US4661769A

公开(公告)日：1987-04-28

申请号：US693765

申请日：1985-01-23

申请人： Adly A. Girgis

发明人： Adly A. Girgis

IPC分类号： G01R23/02 ,  G01R23/12 ,  G01R25/00

CPC分类号： G01R25/00 ,  G01R23/02 ,  G01R23/12

摘要： Methods for determining magnitude, phase angle and frequency deviation in the sinusoid waveform output of electrical power generation equipment are disclosed. The first method uses a two-state linear Kalman filter to calculate the magnitude and phase angle from which the frequency deviation is calculated using the linear relationship between frequency deviation and the average rate of change of phase angle. In a second method, a three-state extended Kaman filter is employed. The frequency deviation is considered a third state variable and is recursively computed on-line.

摘要翻译： 公开了用于确定发电设备的正弦波形输出中的幅度，相位角和频率偏差的方法。 第一种方法使用双态线性卡尔曼滤波器来计算使用频率偏差和相位角的平均变化率之间的线性关系来计算频率偏差的幅度和相位角。 在第二种方法中，采用三态扩展卡曼滤波器。 频率偏差被认为是第三个状态变量，并在线递归计算。

公开(公告)号：US20240255556A1

公开(公告)日：2024-08-01

申请号：US18560608

申请日：2021-05-21

申请人： Hitachi High-Tech Corporation

发明人： Tomoko SHIMAMORI ,  Yasuhiko NARA ,  Junichi FUSE ,  Akira KAGEYAMA

IPC分类号： G01R23/12 ,  G01N23/2251 ,  G01R1/067 ,  G01R1/28 ,  G01R31/305 ,  H01J37/22

CPC分类号： G01R23/12 ,  G01N23/2251 ,  G01R1/06766 ,  G01R1/28 ,  G01R31/305 ,  H01J37/222 ,  H01J2237/221

摘要： Provided is a sample inspection apparatus capable of identifying a capacitive fault or a potential faulty point where an electrical tolerance is low. The sample inspection apparatus includes: a charged particle optical system configured to irradiate a sample 19 with a charged particle beam; a first probe 21a configured to come into contact with the sample; an amplifier 23 having an input terminal to which the first probe is connected; and a phase detection unit 40 to which an output signal of the amplifier is input, in which an AC voltage is applied to the first probe, and the phase detection unit detects the output signal of the amplifier using a reference signal synchronized with the AC voltage and having the same frequency as the AC voltage.

公开(公告)号：US20230341448A1

公开(公告)日：2023-10-26

申请号：US18002733

申请日：2021-06-22

申请人： Lam Research Corporation

发明人： Ashish Saurabh ,  Karl Frederick Leeser

IPC分类号： G01R23/163 ,  G01R19/252 ,  G01R23/12

CPC分类号： G01R23/163 ,  G01R19/252 ,  G01R23/12

摘要： An apparatus may include one or more measurement sensors, which may measure power coupled to one or more process stations of the apparatus. The apparatus may additionally include one or more analog-to-digital converters coupled to an output port of a corresponding one of the one or more measurement sensors, which may provide a digital representation of a RF signal measured by the one or more measurement sensors. A processor, coupled to a memory, may determine a crossing of the digital representation of the signal with a reference signal level and may thus determine a frequency content of the RF signal and the characteristic, which may permit the nulling out of phase lag of the one or more measurement sensors.

公开(公告)号：US11668760B2

公开(公告)日：2023-06-06

申请号：US17353529

申请日：2021-06-21

申请人： Tsinghua University

发明人： Shilin Gao ,  Ying Chen ,  Shaowei Huang ,  Chen Shen ,  Zhendong Tan

IPC分类号： G01R31/42 ,  G01R23/12 ,  G01R31/40 ,  G05F5/00

CPC分类号： G01R31/42 ,  G01R23/12 ,  G01R31/40 ,  G05F5/00 ,  H02P2209/00

摘要： The present disclosure provides an optimization method, a unit, and an electronic device of a shifted frequency (SF)-based electromagnetic transient simulation, comprising: determining a current amplitude and a voltage frequency based on a node voltage and a branch current calculated from a shifted frequency on a basis of a current time step; determining an optimal shifted frequency of the current time step based on the current amplitude and the voltage frequency; and updating the shifted frequency by adopting the optimal shifted frequency of the current time step for calculating a node voltage and a branch current of the next time step. The method, the unit, and the electronic device provided in the present disclosure may gradually update and optimize the shifted frequency in the simulation process so to enable the shifted frequency to reach the best, thus ensuring the accuracy of output current and voltage simulation results.

公开(公告)号：US20190212376A1

公开(公告)日：2019-07-11

申请号：US16240347

申请日：2019-01-04

申请人： Delta Electronics (Thailand) Public Co., Ltd.

发明人： Christian KRUMPHOLZ

IPC分类号： G01R23/12 ,  G01R23/14

CPC分类号： G01R23/12 ,  G01R19/16566 ,  G01R19/175 ,  G01R19/2506 ,  G01R19/2513 ,  G01R23/02 ,  G01R23/14

摘要： A method for estimating a property of a signal (1) sensed in an electrical system, comprises the steps of sensing the signal (1) and estimating a fundamental period of a fundamental of the signal (1) by comparing the sensed signal (1) with at least one threshold (2) to detect threshold crossings and estimating the fundamental period from the threshold crossings. The signal property is then estimated from the fundamental period and/or from the sensed signal (1) during an interval of a length of the fundamental period.An electronic device according to the invention comprises a micro controller and/or an analogue circuitry which performs the method for estimating a property of a signal. Preferably, the micro controller and/or analogue circuitry controls other parts of the electronic device depending on the results obtained by the method for estimating a property of a signal.

公开(公告)号：US20180017696A1

公开(公告)日：2018-01-18

申请号：US15716125

申请日：2017-09-26

申请人： KYUSHU INSTITUTE OF TECHNOLOGY ,  AI TECHNOLOGY, INC.

发明人： Yasushi Sato

IPC分类号： G01V3/08 ,  G01R23/12

CPC分类号： G01V3/088 ,  G01R23/12 ,  H03D3/10

摘要： Provided is a detection circuit that has a first inductor connected to two opened input ends and detects an external signal having a waveform with a gradient at each input end. The detection sensor further includes an output circuit that has a second inductor magnetically coupled with the first inductor as a primary side. In the output circuit, a third inductor constituting a delay circuit having one end connected to an intermediate tap of the second inductor is connected. Diodes are respectively connected to terminals of the second inductor in a forward direction. Other terminals of the diodes are connected to another terminal of the third inductor via elements each having an impedance characteristic. The output circuit outputs a detection signal detected at the input ends, from the other terminal(s) of at least one of the diodes.

公开(公告)号：US20180003750A1

公开(公告)日：2018-01-04

申请号：US15547539

申请日：2015-03-04

申请人： Mitsubishi Electric Corporation

发明人： Kenichi TAJIMA ,  Kazuhide HIGUCHI ,  Morishige HIEDA ,  Takuya SUZUKI

IPC分类号： G01R23/12 ,  H03H17/02 ,  G01R25/00

CPC分类号： G01R23/12 ,  G01R25/00 ,  H03H17/02 ,  H03H17/06

摘要： Filter circuitry is constituted by transversal filters which are connected in parallel to each other. The transversal filters change amplitude and a phase of an input digital signal Xin[n·Ts] and output different digital signals X1[n·Ts], X2[n·Ts], and X3[n·Ts] as respective resulting digital signals whose amplitude and phase have been changed. A phase frequency computer computes a phase θX[n·Ts] and a frequency fX[n·Ts] of the input digital signal Xin[n·Ts] by performing phase computation and frequency computation using the digital signals X1[n·Ts], X2[n·Ts], and X3[n·Ts] output by the transversal filters.