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Patent Searching and Data


Matches 601 - 650 out of 951

Document Document Title
JP02147866
PURPOSE: To obtain a circuit device that is directly operated by an arbitrary digital signal including information and is operated in phase comparison direction for measuring jitter modulation by constituting the device, for example, by ...  
JP02145978
PURPOSE: To use a polyphase alternating-current signal as an input signal as it is and thereby to make it possible to follow quickly a change in frequency of the input signal and a change in phase thereof, by making an interphase phase d...  
JP02136756
PURPOSE: To detect an output being proportional to only a modulation component by detecting a voltage and a current of power 3-phase AC by an optical fiber sensor, and controlling the light emission quantity so that a DC component of the...  
JP02107974
PURPOSE: To enable accurate determination of a phase difference by giving a count start instruction to a phase difference detecting circuit at a time point when conversion of two voltage inputs into rectangular waves is started and a pul...  
JP02096666
PURPOSE: To enable execution of accurate estimation by subtracting 2πi/T [(i) =...-1, 0, +1..., T is a cycle] so as to make a fresh estimated value of frequency be a value within a range of ±π/T and by updating thereby an estimated va...  
JP02096664
PURPOSE: To enable execution of optimum estimation in a short time by a method wherein a detected phase error is weighted with a function based on a time and is multiplied by first and second time variation coefficients. CONSTITUTION: A ...  
JP02096665
PURPOSE: To enable execution of optimum estimation by a method wherein a detected phase error is weighted with the amplitude of an input sine wave and multiplied by first and second time variation coefficients. CONSTITUTION: A sine wave ...  
JP02054612
PURPOSE: To attain high accuracy and to obtain an optional detection time position by dividing a time width of an input pulse by a divisor in response to the desired detection time position, subtracting the result of division from a pres...  
JP02049170
PURPOSE: To obtain an exact phase difference signal by deriving an average voltage of a voltage obtained by segmenting and synthesizing at every positive or negative section waveforms of a difference voltage of a reference AC voltage and...  
JP02026218
PURPOSE: To detect a short-circuit trouble zone without information transmitting means between iron towers by discriminating the direction of the short-circuit trouble point of both end power source system by a sensor mounted near a powe...  
JP02016461
PURPOSE: To enable phase detection between input signals which differ in frequency (n) times by providing a switch means which passes a 2nd input signal only when a 1st input signal passes and calculating the mean value of its output. CO...  
JP02013859
PURPOSE: To detect abnormality such as the voltage drop and phase variation of three-phase power supply voltage by comparing levels at every phases of three-phase power supply voltage to output the first - third pulses corresponding to r...  
JP02010922
PURPOSE: To attain complete circuit integration for a digital PLL circuit for an electronic apparatus or the like by providing an n-stage of delay elements, an n-stage of delay registers, an encoder and a correction circuit so as to dete...  
JP01316631
PURPOSE: To measure the phase difference between an oscillating force being applied to a test sample and a dimensional oscillation response regardless of drift of DC component in the signal or the operating frequency by employing an elec...  
JP01305367
PURPOSE: To detect the state of loading accurately by comparing the counted value of a counter with the first preset value, and presetting the second preset value in the counter as an initial value in response to the output signal of an ...  
JP01304366
PURPOSE: To determine a large number of phase angles at high rate with high accuracy within a predetermined time by determining the phase angle through shift, omit and reference to a lookup table without performing a long time calculatio...  
JP01291175
PURPOSE: To obtain a stable simple pulse by providing either an AND circuit or an OR circuit with inputs which have one side input terminal for the signal outputted from an noncoincident circuit and another side input terminal for the si...  
JP01283015
PURPOSE: To prevent erroneous detection reliably by producing an alarm if a vector operated through a recursive algorithm does not match with a vector operated through a non-recursive algorithm. CONSTITUTION: A vector operating unit 10 a...  
JP01274074
PURPOSE: To make it possible to measure phase jitter in a total digital mode, by obtaining the time domain data of the phase errors of a digital-phase controlled oscillator (VCO). CONSTITUTION: A VCO 20 estimates data θi which represent...  
JP01257274
PURPOSE: To make it possible to perform efficient estimation characterized by few losses and a small number of data, by performing frequency conversion and discrete Fourier transformation of complex sample data blocks. CONSTITUTION: When...  
JP01250768
PURPOSE: To obtain a detecting circuit of simple construction, by a method wherein levels of outputs of two signals combined to be of a reverse phase and the same phase in a four-terminal hybrid are subjected to subtraction and amplifica...  
JP01250769
PURPOSE: To shorten a time for detection, to reduce an error in discrimination and to make a device small in size, by a construction wherein a high-speed pulse signal is counted in a prescribed number, so as to set a reset-set FF, only w...  
JP01235877
PURPOSE: To obtain a method and a circuit for producing a saw-tooth signal by generating and integrating a square wave having a duty ratio corresponding to the difference of phase/frequency between an input signal and a reference signal....  
JP01233374
PURPOSE: To determine a phase difference between phases of a current signal accurately, by calculating and displaying an absolute phase of quantity of electricity between data at a specified sampling time and a time preceding by a specif...  
JP01185450
PURPOSE: To measure the average value of the advance and delay of the phase of serial data rich in jitter components, by constituting the title circuit of an edge detection circuit, a reference clock forming circuit, a gate, an increment...  
JP01168118
PURPOSE: To give a convenience to a circuit connected to the next stage by outputting two kinds of pulses inverse in logic to each other to be used as phase comparison outputs. CONSTITUTION: The 1st leading detection circuit D1 detects t...  
JP01152373
PURPOSE: To digitally evaluate the frequency and phase of a signal with a digitized sample by processing the phase of the signal and estimating parameters to be analyzed based on the amount of estimation and a selection standard entirely...  
JP01143968
PURPOSE: To dispense with a vector voltage ratio meter and to realize reduction in size and cost and increasing speed by using a digital signal processing unit (DSP). CONSTITUTION: The output of an amplifier 7 is A/D-converted 21, and in...  
JP01137819
PURPOSE: To quicken pull-in of speed or a phase by making the period of a slope narrow only when a 2nd signal rushes from the minimum or the maximum value of a trapezoidal wave into the slope part to add the hysteresis characteristic. CO...  
JP01121773
PURPOSE: To detect a clock waveform without using any sampling clock whose timing needs to be adjusted and to detect even a slight phase shift by smoothing a dot OR waveform and detecting abnormality of a clock waveform as an analog cont...  
JP01110253
PURPOSE: To measure the phase of a signal rapidly and accurately by maintaining the phase of a secondary electrical signal at a constant in a method for detecting the secondary electrical signal by the surface of a sample with particle b...  
JP01110254
PURPOSE: To measure the phase of a signal rapidly and accurately by maintaining the phase of a secondary electrical signal at a constant in a method for detecting the secondary electrical signal by scanning the surface of a sample with p...  
JP01101469
PURPOSE: To display a frequency deviation, etc., automatically on the same range full scale irrelevantly to a signal to be measured by correcting the pulse width of a signal based upon the phase difference between two signals with the fr...  
JP01091622
PURPOSE: To shorten sharply an operation time of obtaining a phase angle difference by computing the phase angle difference by the use of the effective power of a measured branch. CONSTITUTION: The state of connection of the whole electr...  
JP01077329
PURPOSE: To obtain correct positional information between clocks different in frequency band by using a ring oscillator whose oscillation frequency is synchronized with an input clock as a part for delaying an input clock by means of del...  
JP01078171
PURPOSE: To automatically detect and set an optimum aperture by comparing a delay calculated from a phase detecting output from a phase detector and an aperture value derived from an aperture table, with a decided value determined in adv...  
JP01073262
PURPOSE: To enable quick measurement of an overhead ground wire current in case of a fault in an overhead transmission line, by detecting the position of a flat part of an input signal waveform to determine a current amplitude and a curr...  
JP01066566
PURPOSE: To detect a phase difference accurately, by determining zero cross time Tx and Ty of two analog signals while zero cross time Tz is determined for one thereof to compute a phase difference between the analog signals from the tim...  
JP01035387
PURPOSE: To obtain a high-accuracy variable and BPF for resolution setting by mixing mutually 90° out-of-phase signals with a signal passed through a fixed band BPF respectively and inputting them to a digital filter, and calculating th...  
JP01013468
PURPOSE: To improve calculation accuracy by calculating a phase difference θbased on cosθ and sinθ, and using a cos system or a sin system properly according to the error of the phase difference θ is large or not. CONSTITUTION: The o...  
JP01003569
PURPOSE: To improve computation accuracy and detection responsiveness by using a first-in-first-out type memory, outputting data of 90° delay from input and making vector synthesis. CONSTITUTION: A clock generating circuit 11 generates ...  
JP63317779
PURPOSE: To dispense with a phase comparator and to make complicated adjustment unnecessary, by inputting an input signal to a frequency converting part, a band-pass filter, an A/D converter and a plurality of fast Fourier transform oper...  
JP63313081
PURPOSE: To obtain a vector analyzer which has low production cost and high detection accuracy by generating a two-phase signal by a counter consisting of a digital circuit and a ROM table. CONSTITUTION: To the output side of the counter...  
JP63309868
PURPOSE: To speed up a response by a phase variation quantity and a phase variation direction which are obtained by presetting the number of clock pulses at the time when there is no phase variation to a period counter as a reference val...  
JP63309867
PURPOSE: To execute a response at a high speed by a phase variation quantity and a phase variation direction which are obtained by presetting to a period counter by using the number of clock pulses when there is no phase variation, as a ...  
JP63274874
PURPOSE: To easily and speedily find the phases of M (maximum) series by employing AND or OR for the calculation of the correlation between two M series. CONSTITUTION: This consists of a phase varying circuit 1 which varies the phase of ...  
JP63274875
PURPOSE: To measure the phase of an object M series by selecting the equal numbers of successive elements of the same order from two M (maximum) series and calculating the autocorrelation functions of their sum signals. CONSTITUTION: The...  
JP63259474
PURPOSE: To enable highly accurate measurement of phase, by performing a double integration of a phase difference between a reference signal and an input signal. CONSTITUTION: Phase differences are compared with a phase comparator 5 betw...  
JP63233382
PURPOSE: To increase an accuracy by providing two latch circuits for using a pulse signal from a pulse generating circuit as a strobe signal, taking-in the complementary output voltage of a differential amplifier circuit at the time when...  
JP63188774
PURPOSE: To measure the current value and phase of a detection current with high accuracy by inputting the bipolar detection current to the input terminal of one LED when the detection current is in specific phase, and causing the LED to...  

Matches 601 - 650 out of 951