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7598723 |
Method and apparatus for detecting resonance in electrostatically driven elements
A method and system is disclosed that can be used to directly detect and analyze an electric signal electrostatically induced a semi-conductive or conductive element at resonance. Through detection...
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7355378 |
Source synchronous sampling
There is provided a method of source synchronous sampling, where a first clock signal of a first unit is synchronized to a second signal received from a second unit. The method includes determining...
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7132766 |
Method and apparatus for providing a switching signal in the presence of noise
A technique for controlling a switching circuit, such as a relay, includes one or more sensing circuits that generate signals based upon the presence of an actuating object and upon a randomly...
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7043383 |
Frequency error detection apparatus and method based on histogram information on input signals
A frequency error detection apparatus and method based on histogram information of an input signal. The apparatus includes an A/D converter for and converting an analog signal into digital values;...
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7026804 |
Sample and hold circuit
A method and system for sampling an analog signal that minimizes perturbations caused by noise. In one embodiment, the sample and hold circuit includes a plurality of switches in series between the...
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6922066 |
Sampler and method of measuring a waveform of a current with jitters reduced
In a sampler for use in measuring a waveform of an electric signal, a measurement target current is given as the electric signal to a sampler chip 11 and is also used to produce a trigger current...
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6839657 |
Method of and an arrangement for characterizing non-linear behavior of RF and microwave devices in a near matched environment
A method of and an arrangement for characterizing non-linear behavior of RF and microwave devices under test in a near matched environment. The method comprises the steps of exciting the device by...
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6545454 |
System and method for testing an integrated circuit device using FFT analysis based on a non-iterative FFT coherency analysis algorithm
A system tests analog and mixed signal IC devices using an FFT algorithm, supported by a non-iterative Fast Fourier Transform (FFT) coherency analysis algorithm to establish FFT sample-set...
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6541952 |
On-line cancellation of sampling mismatch in interleaved sample-and-hold circuits
The present invention relates to a high speed sample and hold circuit having a plurality of sample and hold subcircuits coupled in parallel between an input and an output. The circuit also having a...
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6483287 |
Waveform measuring apparatus
A frequency synthesized signal generator outputs a frequency synthesized signal having a frequency equal to a repetition frequency of a signal under test by employing a reference signal. A phase...
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6344735 |
Spectrum analyzer and spectrum measuring method using the same
A power spectrum waveform is obtained by logarithmically amplifying a signal received by a frequency-sweep operation, detecting the amplified output of each frequency sweep, converting the detected...
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6329806 |
Process for determining the harmonic oscillations of the fundamental component of an electrical signal
The present invention relates to a process for determining harmonic oscillations of a fundamental component of an electrical signal, wherein the signal is sampled with a sampling frequency...
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6246223 |
Method for use on a parametric tester to measure the output frequency of a ring oscillator through voltage sampling
A method is provided for use on a parametric tester that allows the parametric tester to more effectively and precisely measure the output frequency of a periodic pulse signal generating means. The...
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5932998 |
System for determining fundamental frequency of an AC signal
A system for determining the fundamental frequency of a digitized AC signal is disclosed. Each signal zero crossing is detected, and in response to each zero crossing, two discrete impulses are...
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5834930 |
Device for sensing the period of a digitized signal including noise evaluation and averaging over a plurality of zero crossing
A real time sensor for signal periods includes a zero crossing sensor for sensing a period of a signal and a noise evaluation circuit. If the noise of the signal is smaller than a predetermined...
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5714876 |
In-service serial digital source signal-level and cable-length measurement
An in-service cable length and source signal level measurement system uses a simple, zero-IF superheterodyne receiver tuned to only two reference frequencies to generate samples of a serial digital...
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5631553 |
High precision RF vector analysis system based on synchronous sampling
The signals to be measured are transformed in the system to discrete time digital signals by synchronous sampling. These digital signals are then processed by a digital signal processor for vector...
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5602709 |
High impedance fault detector
A method and apparatus for detecting high impedance faults and other arcing phenomena in an electrical distribution system. Electrical signals on the distribution system are monitored and a number...
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5589763 |
Coherent undersampling digitizer for use with automatic field test equipment
An apparatus measures a repetitive signal in a coherent manner, including a signal generating circuit to output the repetitive signal in accordance with first clock signals which are generated by a...
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5545976 |
Gated spectrum analyzer
A narrowband spectrum analyzer separates and analyzes a chosen segment of a periodic signal. The signal to be analyzed is digitized by an A/D converter. A gate generator is configured to trigger on...
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5508605 |
Method for measuring RF pulse frequency
A method for measuring the frequency of a stream of RF pulses using multi-purpose, commercial-off-the-shelf test devices, such as an RF signal down converter, a digitizer and a signal processor....
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5373236 |
Highly accurate zero crossings for frequency determination
The technique to measure the frequency very accurately for electronic warfare (EW) applications, and is simple in hardware, and which can accomplish this goal with a signal with real data (in...
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5359533 |
Method for determining a frequency/time profile of hits, and device for carrying out the method
In a method for determining a frequency/time profile of hit sequences and the corresponding device, a measuring window is opened after an external starting signal has been locked. As long as the...
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5323104 |
Method and arrangement for demodulating a frequency modulated signal
The invention relates to a method and to an arrangement for demodulating a signal (f) preferably frequency modulated with digital information, and then particularly a frequency shift modulated...
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5262714 |
Sinewave frequency measuring apparatus
This invention relates to sinewave frequency measuring apparatus and method and more particularly such apparatus including a frequency estimator triggered by a zero crossing of a sinewave and means...
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5198750 |
Extremely wide range frequency measurement method
This invention discloses a digital frequency measurement system, providing high accuracy and a fast dynamic response over an extremely wide frequency range. This measurement system provides for...
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5019823 |
Frequency measurement
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...
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4928251 |
Method and apparatus for waveform reconstruction for sampled data system
Representations of signal edges of a repetitive signal are sampled without triggering, then sorted out based on frequency and sequence and then superimposed along a common time base of one period...
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4862073 |
Repetitive wave sampler
A repetitive wave sample suited to monolithic integrated circuit fabrication, comprising a comparator followed by a master/slave latch feeding into an integrator. The inputs of the comparator are...
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4789950 |
Pre-interpolation adaptive filter
An adaptive filtering procedure reduces overshoot which may be present on a waveform having infinite slopes displayed on a digital oscilloscope as a result of interpolation between samples at the...
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4786861 |
Frequency counting apparatus and method
A device and method for measuring the frequency of an input signal by measuring the number of cycles of the input signal that occur in a sample interval between successive sampling times t n . An...
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4779044 |
Voltage, current and frequency measuring of non-standard waveforms
A regularly repetitive, almost periodic but non-regularly shaped waveform is amplitude sampled at an interval different from that of the waveform under investigation. For a voltage measurement, the...
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4771232 |
Non-interruptive spectrum analyzer for digital modems
A system and method are provided which allow a user to obtain a plot of the amplitude response of a channel such as a telephone line in the band occupied by a modem signal without interrupting or...
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4740744 |
Digital signal processing apparatus for analog signals having wide frequency and dynamic ranges
A digital signal processing apparatus for operating upon analog signals having wide dynamic and frequency ranges is described. The invention includes a digital section and an analog section, the...
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4716363 |
Exponential decay time constant measurement using frequency of offset phase-locked loop: system and method
Oxygen determination based on luminescence quenching of fluorescent dye is effected by using the frequency output of an offset-phase locked loop to calculate the time constant for the exponential...
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4667152 |
Method of and system for determining locations of sources of harmonics in a power distribution network
Current and voltage waveforms on the branches of each node of a power distribution network are sampled. The samples are converted to digital signals which are resolved into spectral components and...
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4661769 |
Measurement of magnitude and phase angle of voltage and current phasors and frequency deviation in power systems
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...
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4651089 |
Frequency counting arrangement
A method and apparatus for determining the frequency of an input signal. The input signal and a sampling signal having a sampling frequency f s to a sampling mixer to produce a first intermediate...
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4646004 |
Phase-locked sampling of a periodic signal
A method for phase-locked sampling measurement of a periodically varying quantity. The samples are designated g(I) . . . g(I-n) and may comprise one complete period or a half of one period. The...
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4635207 |
Field measuring system
A method and apparatus for measuring the individual strengths of two superimposed vector fields at different frequencies by sensing the three orthogonal directional components of the field,...
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4634966 |
Binary processing of sound spectrum
A frequency spectral distribution of sound signal has a plurality of discrete data at respective channels where sampling takes place. Such a spectral distribution, defining a parallel signal, is...
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4620147 |
Signal detector
A signal detector identifies a desired frequency component having the greatest amplitude in an input signal containing other frequency components of smaller amplitude such as spurious noise, etc....
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4574234 |
System for measuring selected parameters of electrical signals and method
An electrical measuring system for measuring selected parameters of electrical signals derived from magnetic recording and having a frequency within a known frequency range wherein the system...
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4542336 |
Method and apparatus for sampling broad band spectra in fuel quantity measurement systems
A method and apparatus is proposed for sampling at a low rate a broad band sparse spectrum without aliasing to a specified band in which a lowest sampling frequency is found by selecting that...
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4533867 |
Method and apparatus for measuring high frequency signals
A method and associated apparatus for accurately determining the frequency of signals in the Gigahertz range. The signal is gated and applied to a conventional prescaler, producing an output signal...
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4529930 |
Programmable delay for digitizer circuits
A digitizer circuit for converting analog waveforms displayed upon a CRT screen into digital signals suitable for storage in memory employs a microprocessor to determine, from user-specified...
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4468614 |
Average frequency measuring apparatus
An average frequency measuring apparatus in which auxiliary gate signals are converted into synchronized gate signals synchronized with either input signals or clock signals; first and second gates...
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4438392 |
Device for sampling and holding the carrier frequency of short duration pulses
A device for measuring the frequency of a pulsed carrier signal in which the carrier frequency is situated within the frequency range and to give a continuous signal whose frequency is equal to the...
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4427938 |
Very-wide-band samplers
A sampler is constituted by a section of a rectangular waveguide in which are mounted two diodes connected in series by means of a conductor which is placed at equal distance from the two large...
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4374358 |
Apparatus for measuring the oscillation frequency of a voltage controlled oscillator
The apparatus of the present invention is provided with a reference oscillator having an oscillation frequency lower than the oscillation frequency of a voltage controlled oscillator to be...
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