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Patent Searching and Data


Matches 101 - 150 out of 951

Document Document Title
WO/1995/006260
A transmitting box (101) is connected to a first electrical outlet in a building. The phase of the first electrical outlet is used as the reference phase. The transmitter box senses each of the zero-cross-overs of the reference phase and...  
WO/1994/011744
This invention gives a very precise and simple digital circuitry as well as basis for software to measure the phase difference between harmonic components of any of two of the input signals. The apparatus may be used also for measuring t...  
WO/1994/003818
A method and apparatus for rapidly and continuously sampling AC voltage and current signals in a plurality of power distribution circuits. The sampled signals are then analyzed in a sine board computer to derive the number of fundamental...  
WO/1991/014329
An electrical circuit for producing a digital value which is representative of instantaneous phase of an electrical input signal relative to a reference frequency signal. The circuit includes a digital counter for continuously generating...  
WO/1991/008493
Method and device for comparing analog signals by transformation of analog signals into binary logic signals, detection of zero crossings by means of comparators (30), and providing a correlation signal by means of a logical circuit (32)...  
WO/1991/005422
A phase-detector circuit for a phase-locked loop clock recovery system detects the phase difference between an information signal and a clock signal and produces a phase error signal representative of the phase difference. The phase dete...  
WO/1990/015482
A digital phase detector (500) for providing an output (520) characterized by the phase difference of a first input signal (175) and a second input signal (275) is provided. The phase detector comprises a first (200) and a second (300) d...  
WO/1990/013040
The invention relates to a method and an apparatus for accurate digital determination of the time or phase position of a signal pulse train in relation to a fixed time or frequency reference. The arrangement generates and produces direct...  
WO/1989/009450
A method and apparatus for evaluating the performance of a device, such as a quadrature encoder (14), wich generates at least two electrical wave train signals (10, 11), each varying between first and second states and the two normally b...  
WO/1989/001634
A method for measuring channel-to-channel skew or phase difference in an electronic system of the type having a plurality of input channels which are sampled by sampling pulses having a frequency fo and a period Po. The sampling pulses a...  
WO/1988/010432
A method for removing phase errors from RF signals generated by movement of the cable interconnecting a network analyzer (22) and a device under test (14). The method includes the steps of measuring (30) the phase difference between inci...  
WO/1988/009938
A method and apparatus of deriving a directional polar diagram from the signals R received by a synthetic-aperture aerial (in direction-finding applications), or P from such an aerial (in radio-beacon applications), these signals includi...  
WO/1988/005543
A system (Fig. 3) and method for detecting an abnormality in a network (10) for distributing or transmitting electric power at a predetermined fundamental frequency. The system produces a signal (40) representing the fundamental frequenc...  
WO/1988/002867
The invention relates mainly to a phase measuring device. The use of adapted filters (140) makes it possible to increase the signal/noise ratio of a received signal. Nevertheless, if a plurality of signal samples having each a different ...  
WO/1987/003097
A phase-frequency discriminator comprising a first RS latch coupled to provide first output signals, said first RS latch including an S input terminal coupled to receive first input signals; a second RS latch coupled to provide second ou...  
WO/1986/006174
An apparatus for measuring the signal level of a signal to be measured is provided with a reference signal oscillator, a variable local signal oscillator, a heterodyne-type mixer, a band-pass filter, and means for automatically correctin...  
WO/1986/002722
A device for measuring the flow velocity of a liquid in a conduit, comprising two ultrasonic transducers and an electronic circuit arrangement, in which each one of the two transducers concurrently transmits a burst to the other transduc...  
WO/1982/003276
A power transducer (Fig. 2) of a variety utilizing time division multiplication and configured under a principle of operation incorporating an integrator stage (51). Phase adjustment for the transducer is provided by a network (56) which...  
WO/1982/002987
A phase detector circuit (10) has low offsets and is easily made as a bipolar integrated circuit. A first input (11) to the phase detector controls a transistor (14) which in turn controls a current source (17). The output of the current...  
JP2013250231
To quickly and highly accurately detect a phase difference between two AC signals.A phase difference operation part calculates a phase difference φr(=φ2-φ1) of two detected voltages v1(phase angle φ1), v2(phase angle φ2). After oper...  
JP2013205147
To provide a phase display unit capable of easily indicating a phase difference between three-phase AC currents at two points.The phase display unit indicates a phase difference of the phases corresponding to each other at the two points...  
JP2013195222
To calculate an effective value and a phase difference of an AC signal easily.When an AC voltage and an AC signal are detected and then filter sections 51 and 52 extract a fundamental wave component, arithmetic processing in the filter s...  
JP2013190301
To provide a phase detector capable of stably detecting a phase.A phase detector 10 comprises an oscillation circuit 9 that oscillates a phase θi to be synchronized with an AC system voltage V1, generates a waveform V2 with a phase φ o...  
JP2013167500
To accurately detect a phase of an input signal while reducing influence of unbalanced components and harmonic components.A phase detection device 10 comprises: a fundamental wave orthogonal component calculator 10A that includes a three...  
JP2013053929
To provide a phase-contrast measurement system capable of accurately measuring a phase contrast by improving a way of processing by a Lissajous method.A phase-contrast measurement system 1 comprises: an A/D converter 7 that applies A/D c...  
JP2012211896
To provide a method of determining at least one parameter (frequency, phase angle, amplitude) of a sinusoidal signal generated by a power grid.The frequency of the signal is determined iteratively based on a linear relationship among the...  
JP2012108085
To provide a harmonic calculation parameter analysis apparatus which accurately estimates a harmonic calculation parameter and is so accurate as to estimate a worst value of the harmonic calculation parameter, and a harmonic calculation ...  
JP2012093341
To detect frequency of input signals, the frequency being unknown or changing over time, without using a PLL.A signal detection apparatus 1 includes a control block composed of a band-pass filter 2 whose coefficient a1 is variable, a fir...  
JP2012026738
To give means for performing binary phase detection with a high signal-to-noise ratio for a feeble micro wave signal.In the state where a signal desired to detect is inputted to a resonator, the resonator is parametric-oscillated. By uti...  
JP2011247852
To provide a phase detection method of an AC signal having one or more phases, of which a frequency range is preliminarily known, of a voltage or the like of a power system.Following steps (a) to (f) are repeatedly executed; the step (a)...  
JP2011242195
To simply discriminate a phase of a distribution line of each phase constituting a high-voltage distribution line using an inexpensive apparatus in a phase discrimination portion.A phase discrimination apparatus includes: firstly measuri...  
JP2011242211
To provide a phase difference measuring device capable of continuously and stably measuring the phase difference between two input signals in a range of 0 to 360 degrees.A phase difference is calculated by subjecting two input signals R ...  
JP2011208975
To provide a device for detecting a phase angle difference of a power system capable of detecting accurately a voltage phase angle difference between optional nodes in the power system easily without requiring complicated calculation.A t...  
JP2011179988
To provide a digital test plug available for both CTT and PTT, and capable of preventing unexpected accidents, such as, electrical shocks and measuring electric power, and so on.The digital test plug includes: common conductors 24, dispo...  
JP2011169625
To quickly and accurately detect a phase difference between two signals.The phase difference detection device 1, for detecting a phase difference between detection signals S1 and S2, includes a signal detection part 2 detecting the detec...  
JP2011122907
To notify a user of erroneous connection intelligibly, even in the case of an inexpensive segment type liquid crystal or 7-segment LED which is a main current of an electronic indicating instrument.This instrument includes a measuring op...  
JP2010258605
To provide a pulse detector which generates a sample hold signal and holds a signal level of a high-frequency signal even though the attenuation of the signal level is slow when a load having a high Q value to generate plasma is connecte...  
JP2010212929
To provide a PLL performance measuring device accurately evaluating a PLL circuit.A moving average for a phase error detected in a phase locked loop circuit is obtained. On the basis of the comparison of the moving average and a threshol...  
JP2010014616
To provide an inexpensive phase detector as compared with the conventional example for instantaneously detecting phase jump in frequency variation or phase variation of a single phase alternating current voltage due to a simple configura...  
JP2009300089
To provide a new mechanical synchronism detector capable of greatly reducing the size, the weight and cost, while following excellent visibility by a conventional mechanical rotary pointer.In this synchronism detector for indicating a ph...  
JP2009247086
To solve problems related to the installation site of a phase detector and realize a wide variety of applications utilizing phase information.A phase detection system for electric power systems detects the phases of alternating-current v...  
JP2009186345
To detect accurately a phase at a prescribed point of time of a measured signal on which a harmonic is superimposed.This device is equipped with a correlation calculation part 4 for determining an autocorrelation function Dc of a measure...  
JP2009176107
To smoothly conduct a loop switching by rapidly and accurately obtaining the phase difference of an identical phase to early determine the right and wrong of the opening/closing of switches, and preventing a cross current impacting the d...  
JP2009014432
To provide a method for detecting an amplitude and a phase of a sine-wave signal to be measured by using only a sampling processing, through no orthogonal synchronous detection and no phase detector.The sine-wave signal to be measured is...  
JP2008292192
To provide a transformer tester for accurately and rapidly measuring an electronic transformer.This transformer tester is used for comparing the secondary output of a tested transformer structured as an electronic transformer with the se...  
JP2008281498
To provide a phase difference measuring circuit that can measure the difference of transition timing regardless of advance or delay of the 2 signals.EXOR 11 outputs a signal S3 that has a pulse width corresponding to the phase difference...  
JP2008249472
To provide a system and device capable of accurately measuring a phase difference of an AC electrical quantity between two points without electrically connecting the two points mutually, even when each frequency of input waveforms on the...  
JP2008245003
To provide an apparatus for driving and measuring at a plurality of frequencies for a spherical surface acoustic wave (SAW) element, capable of driving and measuring at the plurality of frequencies in spite of a configuration using a sin...  
JP2008185449
To provide a terminal tool for detecting a voltage phase that can obtain high measurement precision irrespective of a size or a shape of an insulation electrical wire of an electrical path of which the voltage phase is to be measured in ...  
JP2008164418
To largely improve the measurement accuracy and measuring dynamic of a vector network analyzer (VNA).The 7 port joint is used for the VNA for measuring an S parameter of a device DUT to be measured. The wave from a power supply VS is put...  

Matches 101 - 150 out of 951