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8664934 
System and method for verifying the operating frequency of digital control circuitry
A system and method are presented for verifying the operating frequency of digital control circuitry. The system and method according to the present disclosure provide for a digitally controlled... 

8384372 
Nonlinear electrical actuation and detection
A method and system is disclosed to detect and analyze an electric signal based on movement between an element and a counter electrode influenced by a nonlinear electric field produced by an... 

8140283 
Independent frequency measurement and tracking
Independent frequency measurement and tracking of a signal using a measurement interval where the frequency of the signal is measured and a sampling rate is calculated, and a settling interval... 

8131490 
Methods and systems for determining a received signal frequency
A system and method for determining a received signal frequency by sampling the received signal at a rate less than twice a predefined nyquist rate. The system includes a distorting component... 

8111106 
Switched phase and frequency detector based DPLL circuit with excellent wander and jitter performance and fast frequency acquisition
Some embodiments of the present invention may include a DPLL circuit comprising a firmware. The firmware may comprise a resampled NCO phase detector capable of receiving a reference clock timing... 

8040125 
Device and method for the analysis of a measured signal transmitted via a multichannel system
A device, in particular, a multichannel oscilloscope, for the analysis of at least one measured signal transmitted via a multichannel system, with several measurement channels. The device... 

7652465 
No dead time data acquisition
A “no dead time” data acquisition system for a measurement instrument receives a digitized signal representing an electrical signal being monitored and generates from the digitized signal a... 

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 semiconductive or conductive element at resonance. Through... 

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... 

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... 

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;... 

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... 

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... 

6839657 
Method of and an arrangement for characterizing nonlinear behavior of RF and microwave devices in a near matched environment
A method of and an arrangement for characterizing nonlinear behavior of RF and microwave devices under test in a near matched environment. The method comprises the steps of exciting the device by... 

6545454 
System and method for testing an integrated circuit device using FFT analysis based on a noniterative FFT coherency analysis algorithm
A system tests analog and mixed signal IC devices using an FFT algorithm, supported by a noniterative Fast Fourier Transform (FFT) coherency analysis algorithm to establish FFT sampleset... 

6541952 
Online cancellation of sampling mismatch in interleaved sampleandhold 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... 

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... 

6344735 
Spectrum analyzer and spectrum measuring method using the same
A power spectrum waveform is obtained by logarithmically amplifying a signal received by a frequencysweep operation, detecting the amplified output of each frequency sweep, converting the... 

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... 

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.... 

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... 

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... 

5714876 
Inservice serial digital source signallevel and cablelength measurement
An inservice cable length and source signal level measurement system uses a simple, zeroIF superheterodyne receiver tuned to only two reference frequencies to generate samples of a serial... 

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... 

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... 

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... 

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... 

5508605 
Method for measuring RF pulse frequency
A method for measuring the frequency of a stream of RF pulses using multipurpose, commercialofftheshelf test devices, such as an RF signal down converter, a digitizer and a signal processor.... 

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... 

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... 

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... 

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... 

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... 

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... 

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... 

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... 

4789950 
Preinterpolation 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... 

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 tn. An... 

4779044 
Voltage, current and frequency measuring of nonstandard waveforms
A regularly repetitive, almost periodic but nonregularly shaped waveform is amplitude sampled at an interval different from that of the waveform under investigation. For a voltage measurement,... 

4771232 
Noninterruptive 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... 

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... 

4716363 
Exponential decay time constant measurement using frequency of offset phaselocked loop: system and method
Oxygen determination based on luminescence quenching of fluorescent dye is effected by using the frequency output of an offsetphase locked loop to calculate the time constant for the exponential... 

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... 

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 twostate... 

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 fs to a sampling mixer to produce a first intermediate... 

4646004 
Phaselocked sampling of a periodic signal
A method for phaselocked sampling measurement of a periodically varying quantity. The samples are designated g(I) . . . g(In) and may comprise one complete period or a half of one period. The... 

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,... 

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... 

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.... 

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... 