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JP4143463B2 |
To provide an insulation monitor which is small and is capable of identifying a phase, in which degradation in ground insulation has occurred. A zero-phase current of a three-phase electric path 7 is measured with a zero-phase current tr...
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JP2008197876A |
To provide an abnormality detection device capable of detecting various kinds of abnormality generated in a processor processing a processed body with high accuracy.This abnormality detection device is an abnormality detection device det...
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JP2008197873A |
To determine the number or form of a distribution function without previously setting a model.Discrete data of a statistical distribution by statistic data or spectral intensity distribution by optical measurement or the like are input a...
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JP4141971B2 |
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JP4138059B2 |
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JP2008182751A |
To make an output frequency non-integer relation to an input frequency.A method and system for digital resolution translation is described. An input frequency is received, as is a desired output frequency. The desired output frequency is...
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JP4126117B2 |
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JP2008155564A |
To provide a current carrying controller of an electrofusion joint significantly improving reliability of fusion work.The controller detects a frequency or a cycle of an AC power source supplied to the current feeding controller feeding ...
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JP4110747B2 |
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JP4108691B2 |
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JP2008521014A |
In a preferred embodiment, methods for improving oscilloscope bandwidth involve the use of frequency up-conversion and down-conversion techniques to obtain system bandwidth that significantly exceeds the bandwidth achievable by interleav...
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JP2008139225A |
To provide a spectrum display device capable of performing efficiently frequency analysis, and a Fourier analyzer using it.This device is formed by improving a spectrum display device for displaying a spectrum based on a transformation r...
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JPWO2006075584A1 |
Provided are an electromagnetic field distribution measuring method capable of measuring an electromagnetic field distribution in consideration of temporal fluctuations of measured values, an apparatus thereof, a computer program, and an...
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JP2008131066A |
To provide a level measuring circuit which has a small circuit scale of a band-limiting filter of a down converter and also has high response speed.The band-limiting filter of the digital down converter is composed of a CIC filter having...
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JP2008122311A |
To provide a spectrum analyzer capable of measuring a spectrum of an electromagnetic wave concerning radio communication of IEEE 802.15.4.This spectrum analyzer for measuring the spectrum of the electromagnetic wave concerning the radio ...
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JP2008516253A |
The present invention relates to a method and apparatus for measuring a frequency or a phase of a measuring signal, wherein the frequency (fg) or the phase (φg) are estimated by approximating the relationship between a collecting clock ...
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JP2008111832A |
To provide a frequency spectrum from which a noise corresponding to fractional spurious is removed.The spectrum analyzer includes a local signal generation part for generating a local signal having a designated frequency; a multiplicatio...
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JPWO2006035776A1 |
The sound field measuring device according to the present invention uses as a measurement signal a measurement signal having at least one turning point and having a frequency spectrum having a shape corresponding to the shape of the freq...
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JP2008107277A |
To provide a signal measuring indicator that can for easily and speedily discriminate the frequency of the source of occurrence of beat noises.The signal measuring indicator for displaying the amplitude at each frequency, by measuring si...
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JP2008107172A |
To solve such a problem that the sweep type spectrum analyzer cannot measure the correct spectrum at the low frequency region because of generating a large spurious signal at the vicinity of 0 Hz because if the frequency of input signal ...
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JP4084934B2 |
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JP4080952B2 |
A frequency measuring device can measure the frequency of a noisy power system at high speed. The system voltage is measured at timings obtained by equally dividing one reference-wave period. Voltage vectors are calculated which have tip...
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JP2008089458A |
To enable analyses of frequency components of a modulated input signal to be compared directly and simply by displaying waveforms of specific frequency components, and to easily make a quantitative determination of the integrity (quality...
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JP4077380B2 |
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JP4076391B2 |
In a periodic signal controller of the present invention, a first phase difference detection circuit 1 and a first sine-wave signal generation circuit 2 constitute a phase-locked loop for processing instantaneous values. A frequency diff...
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JP2008082809A |
To provide electronic equipment by which a precise measurement result of a crystal oscillator is obtained using a measurement device and an investigation work, a unit body evaluation work, and an inspection work of the crystal oscillator...
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JP4069127B2 |
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JP4070985B2 |
A method for detecting loose blades in a hand piece connected to an ultrasonic surgical system by performing frequency sweeps of a drive signal through a range which includes the resonance of a hand piece/blade system and the resonance o...
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JP4070725B2 |
Noise detection is performed by using the output of the phase comparator that the PLL comprises. The phase comparator (2a) outputs a signal that is based on the phase difference between the output of the voltage controlled oscillator (2c...
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JP4067360B2 |
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JP2008064653A |
To provide a spectrometer for simultaneously measuring electric power component ratios of electromagnetic wave at a plurality of different frequencies without sweeping.A rectangular waveguide 2 where cut-off frequency gradually increases...
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JP2008051535A |
To provide an electronic device which allows accurate measurement result of a crystal oscillator to be obtained, without the use of measuring apparatus, and to improve efficiency in investigation work, unit assessment work, and inspectio...
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JP4056004B2 |
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JP2008039762A |
To provide an electromagnetic disturbance wave measuring system that divides the measurement of the amplitude probability distribution of the disturbance wave over a wide band into a plurality of frequency bands, performs the measurent c...
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JP2008039780A |
To convert an electrical signal from the time domain into the frequency domain and analyze and display the electrical signal.Time-domain input data is calculated (402), and frequency-domain data is calculated, by converting the input dat...
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JP4051185B2 |
A method of identifying a signal type uses parameters of the signal as a basis for automatic identification. A signal of interest is selected from a display of a spectral waveform for a specified frequency An occupied bandwidth for the s...
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JP4038009B2 |
A correlation function measuring method and apparatus can correct a correlation vector with high accuracy. The correlation function measuring apparatus includes first signal processing means 18a to 22a for processing a first monitored si...
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JP4038484B2 |
A synchronous vector measuring device can measure an absolute phase angle of a synchronous vector excellent in continuous numerical stability at high speed and with high accuracy in a noisy electric power system. A voltage measuring part...
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JP2007333553A |
To provide a resonance frequency measuring method which prevents a self-arc-suppressing type switching element from breaking down, and can measure the resonance frequency of a resonance circuit with high accuracy, by using an oscillating...
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JP2007333478A |
To provide an inspection method and the like of a semiconductor integrated circuit capable of inspecting fundamental waves, higher harmonics and spurious power without using an expensive device. This inspection device includes first to t...
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JP4027418B2 |
A handheld vector network analyzer (VNA) providing a wide bandwidth test signal FO utilizing a narrowband test signal synthesizer which provides the test signal through a frequency divider or harmonic generator. With a 550-1100 MHz narro...
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JP4028140B2 |
In contrast with a known dynamic gate-level simulation method, a method of analyzing electromagnetic interference (an EMI analysis method) according to the present invention enables estimation of EMI noise, by means of calculating signal...
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JP4023684B2 |
A frequency-current conversion circuit permits stabilization of the frequency characteristic of an equalizer that is used in a high-speed optical disc apparatus. The frequency-current conversion circuit includes a comparison circuit that...
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JP2007322153A |
To provide a spectrum interpolation method and the like for determining from a discrete spectrum generated by FFT calculations the spectrum of an arbitrary frequency between two discrete points which does not appear on the discrete spect...
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JP4013445B2 |
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JP2007304060A |
To obtain an IFM device capable of instantaneously detecting effective frequency. A frequency calculation circuit 4 sends out frequency data q1 of an input signal a, based on phase detection videos b1, b2 and outputs phase detection vide...
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JP4011582B2 |
The invention relates to a fading frequency estimating apparatus that performs a predetermined signal processing on a radio frequency signal that arrives through a radio transmission channel, to estimate a frequency of fading occurring o...
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JP4009419B2 |
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JP2007285941A |
To measure accurately and easily a carrier wave frequency without being influenced by a modulation system of a radio communicator or phasing of a transmission path. A radio signal is received and converted into an intermediate frequency ...
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JP2007530917A |
Simple conventional frequency measurement circuits comprise two counters as essential elements. In such counters a problem may occur that the count value has a relative error of ±1/N, corresponding to the measurement interval. According...
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