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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...
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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...
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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...
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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...
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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...
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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...
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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...
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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 ...
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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...
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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...
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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...
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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...
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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...
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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...
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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 ...
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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...
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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...
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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)...
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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...
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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 ...
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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...
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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...
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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...
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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...
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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...
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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...
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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...
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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...
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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...
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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...
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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...
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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...
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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...
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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...
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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...
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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...
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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 ...
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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...
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JP2008154452 |
To provide a step-out detecting apparatus capable of surely detecting a step-out among a group of generators at both sides of interconnected lines in a power system, irrespective of the predetermined difference in phase angles.The step-o...
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JP2008076175 |
To provide a technology capable of accurately detecting the peak position of an analog signal even if the amplitude of the analog signal changes.A reference position detecting section detects two time positions where a signal level of th...
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JP2008064523 |
To provide an amplitude calculation device, impedance measuring device, amplitude calculation method and impedance measuring method equipped with the same capable of simply and quickly obtaining the amplitude of the AC signal in the meas...
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JP3956062 |
To reduce a data error rate owing to errors caused by interpolation. A sum (9Si+1+9Si) of a nine-fold value (9Si+1) obtained by multiplying a sample value delayed by a delay element 21 by nine by means of an adder 22 and also a bit shift...
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JP3931072 |
To provide a method and device by which a state of internal memory in a writing device for a data carrier can be recognized at any time, and also a request to a transmission bus is suppressed, when monitoring the state of the internal me...
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JP2007047181 |
To detect leak current caused by ground insulation resistance.This leak current detection device comprises: a leak current detection section 10 for detecting leak current from a measured line; an amplifying section 11 for converting the ...
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JP2007010347 |
To simplify the configuration of a time interval measuring apparatus and achieve high-precision measurement.For first and second signals, of which the time difference is to be determined, a voltage value corresponding to a lapse of time ...
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JP2007010596 |
To provide a phase difference measuring circuit, applicable to low frequency, having high-accuracy over 360 degrees, the identical phase timing can be obtained if a received signal intensity varies, reducing the higher harmonics noise in...
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JP2006317435 |
To provide a phase/amplitude detector capable of detecting a phase and/or an amplitude of an AC electric quantity within one cycle of the AC electric quantity.The AC electric quantity is read by an input part 11 at predetermined sampling...
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JP2006300746 |
To calculate a phase difference quickly and precisely.This processor is provided with an A/D conversion part 22 for sampling two alternating current signals respectively at a preset prescribed period, and for converting those into altern...
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JP2006300804 |
To provide a high-frequency signal measuring instrument easy to connect and precluding a phase noise of an oscillator from acting as phase measuring error.The high-frequency signal measuring instrument is provided with a plurality of cha...
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JP3864488 |
To obtain a specific number of arithmetic results from a final arithmetic stage by equipping each arithmetic stage with a delay element and pipelining them, and then performing butterfly operation by each arithmetic stage each time one s...
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