Matches 351 - 400 out of 440 < 1 2 3 4 5 6 7 8 9 >
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5561605 Arc detection using current variation  
In an electric circuit supplying AC line current to a load (30, 31) from an AC source (26) of given frequency providing repetitive cycles, arc detection is provided by sensing cycle to cycle...
5557800 Data compression device allowing detection of signals of diverse wave forms  
The data compression device allows detection of signals of diverse wave forms and also recording of the time and number of their next appearance. In particular, the Information Compressor includes...
5555514 Method of and apparatus for generating doppler sounds  
Method and apparatus for generating Doppler sounds, even when there are segmented Doppler modes, wherein I and Q components of a Doppler signal are respectively converted into left and right sound...
5537388 Method and apparatus for characterizing and compensating for non-linear components  
A method of determining the degree z of a hyperbolic non-linear characteristic, of a process that is controlled by application of a manipulated variable signal thereto for varying a first...
5537318 Lightning strike detection and mapping system  
A lightning strike detection and mapping system which determines the range and bearing of each valid lightning strike by (1) computing the Fourier Transform, and more preferably the discrete...
5532943 Particle analyzing apparatus and method therefor  
A particle analyzing apparatus includes a particle detector for measuring each of many particles to obtain at least one kind of data for each particle, a conversion unit for converting the obtained...
5530373 Method and apparatus for determining and selectively displaying valid measurement information  
An electronic test instrument adapted for displaying only meaningful information notwithstanding the intermittent arrival of valid input signals due to probing operations is provided. Two...
5528134 AC power analyzer  
A harmonic analyzer using a short sampling window eliminates truncation artifacts in the sampling of an AC power waveform by equating the length of the sample period to a period of the sampled...
5499189 Signal processing method and apparatus for discriminating between periodic and random noise pulses  
Specific noise components in an input signal are identified and isolated for processing in a desired manner. The method comprises determining an interval during which the noise component is...
5495168 Method of signal analysis employing histograms to establish stable, scaled displays in oscilloscopes  
A method of signal analysis for establishing display scaling and stable triggering for digital oscilloscopes employs amplitude and time histograms to analyze an input signal and establish the...
5493515 Twice scaled waveform display  
The twice scaled waveform display apparatus combines a twice scaled factor indication with the autoscaled waveform display so that an input data quality indication is produced based on factors such...
5487016 Apparatus for generating a signal representative of total harmonic distortion in waveforms of an A/C electrical system  
A microprocessor based device for generating a representation of the total harmonic distortion in an ac waveform derives from digital samples of the waveform a fundamental signal representing the...
5471396 Estimator of amplitude and frequency of a noisy-biased sinusoid from short bursts of samples  
The amplitude or frequency of a sinusoidal signal represented as sample values S 1 , S 2 , S 3 , S 4 is estimated by computing a triplet of differences x 1 , x 2 , x 3 , where x 1 is a difference...
5457637 Flash waveform analyzer method and device  
A flash waveform analyzer (10) includes a transmission line (12) for propagating a signal from an input (14). The transmission line (12) contains a plurality of samplers (16) located at different...
5448503 Acoustic monitor  
A system for real-time analysis of weld quality in an arc welding process. he system includes a transducer which receives acoustic signals generated during the welding process. The acoustic signals...
5392218 Electrically isolated approach to sensing dc voltages referenced to a floating ground  
An analog isolation barrier data acquisition system comprises a plurality of satellite sampling modules which are referenced to remote grounds for sensing direct current (dc) voltages which are...
5375067 Method and apparatus for adjustment of acquisition parameters in a data acquisition system such as a digital oscilloscope  
A data acquisition system such as a digital oscilloscope includes a central processing unit which controls the waveform memory, analog to digital converter, trigger generator, and display to...
5347464 High-pass filter for enhancing the resolution of AC power line harmonic measurements  
An instrument employs a high-pass filter and an associated amplifier to reduce the number of Analog-to-Digital-Converter bits required to determine the amplitude of harmonics contained in digitally...
5323331 Method and circuit arrangement for level monitoring  
In a method and circuit arrangement for level monitoring, a received or, respectively, absent data signal should be reliably recognized by the level monitoring equipment even given great...
5321365 Reduced noise sensitivity in inverse scattering through filtering  
An inverse scattering processing method with enhanced noise immunity and resolution capabilities for use in modeling multi-layer acoustic, electromagnetic or other propagating media. A time bounded...
5274569 Dual sense non-differencing digital peak detector  
A dual sense non-differencing peak detector locates a peak without introducing unwanted noise components, and also corrects for signal asymmetries. This is accomplished by identifying two...
5247454 Reconfigurable circuit monitoring system  
A circuit monitoring system for a distributed power network employs waveform capturing techniques for efficient and highly accurate monitoring. The system includes a plurality of circuit monitors...
5243537 Method and apparatus for rapid measurement of AC waveform parameters  
Errors introduced into ac waveform measurements based on discrete amplitude samples because the waveform period is not an integral number of sampling intervals are substantially averaged out by...
5233538 Waveform capturing arrangement in a distributed power network  
A circuit monitoring system for a distributed power network employs waveform capturing techniques for efficient and highly accurate monitoring. The system includes a plurality of circuit monitors...
5180971 Method and apparatus for increasing throughput in random repetitive digitizing systems  
Circuits for increasing throughput in random repetitive signal acquisition systems that use triggers. The circuits allow the random repetitive signal acquisition systems to terminate an acquisition...
5130933 Rotation sensing system having sensor malfunction detection  
A rotation sensing system includes a rotation sensor for outputting sinusoidal pulses, a waveform shaping circuit for shaping each of the sinusoidal pulses into a rectangular pulse, and a...
5122974 Phase modulated spectrophotometry  
The present invention to provides methods and apparatus for studying photon migration using signal modulation techniques such as time, frequency and phase modulation. The photon migration data may...
5123034 Automatic anomalous event detection  
An automatic anomalous event detection method uses a pair of counters to count the occurrence of main triggers simultaneously with the occurrence of advanced triggers indicative of anomalous events...
5075867 Method for limiting spurious resonant cavity effects in electronic equipment  
Spurious cavity resonance effects in a cabinet housing electronics circuitry are suppressed by determining the maximum repetition rate or frequency for legitimate signals which can appear in the...
5047991 Lithology identification using sonic data  
A method of identifying lithology of a formation traversed by a borehole from which sonic data is acquired is disclosed. The sonic data acquired comprises a data set of m waveforms, each of the...
5043927 Digital signal quality analysis using simultaneous dual-threshold data acquisition  
A method for performing signal quality analysis on digital signals uses simultaneous dual threshold data acquisition. Using this method, the data need not be repetitive and, because the reference...
5019995 Input signal discrimination method  
An input signal discrimination method is provided wherein the on/off state of an AC input signal is discriminated. An AC input signal (1) is input to a processor (21) through a photocoupler (13)....
5001419 Method of deriving an AC waveform from two phase shifted electrical signals  
The voltage between two objects is measured utilizing an electro-optic crystal exhibiting birefringence in two axes (slow and fast) mutually orthogonal to an optic axis extending between the two...
4979122 Apparatus and method for monitoring power  
A power monitor, for determining real and imaginary power associated with one or more line signals, samples a plurality of line cycles during an observation window to generate a plurality of...
4953147 Measurement of corrosion with curved ultrasonic transducer, rule-based processing of full echo waveforms  
An acoustic transducer having a curved surface to match the inner or outer surfaces of a target surface such as a cylindrical borehole tubular is disclosed. A sequence of excitation pulses causes...
4908622 Process and circuit for sampling according to instantaneous signal value, independent from the frequency range of the signal to be recorded  
An unkown signal is sampled by simultaneously comparing its value with that of each of a plurality of predetermined monitoring levels. An independent time variable is recorded that represents the...
4901009 Method and device for the automatic recording of signal curves  
In a digital oscilloscope, the recording of transients exceeding a predetermined tolerance range is to be provided by simple means. A method and a device for carrying out this method are provided...
4878194 Digital signal processing apparatus  
A digital signal processing apparatus includes an A/D converter for converting an analog input signal to digital data, a memory having a plurality of memory blocks for storing the digital data, and...
4873647 Digital waveform analyzer  
An automated waveform analyzer for designing, on a computer, a logic implementation of an interface circuit connected between a first digital device and one or more other digital devices. The...
4827259 Circuit for high-frequency sampling and compression of data for high-frequency electrical transient signals superimposed in a low frequency steady-state signal  
A circuit samples and stores high frequency transient events that affect low frequency steady state signals. The circuit digitizes the high frequency transient signal and samples the digital...
4807147 Sampling wave-form digitizer for dynamic testing of high speed data conversion components  
A sampling digitizer system which may be expanded for the dynamic testing of high speed data conversion components is provided. The sampling waveform digitizer system comprises a sampling...
4800895 Electroencephalographic data display method and system  
A novel display method and system for electroencephalographic data includes the use of a linear array of picture elements whose distance from each other is inversely proportional to the power of...
4799165 Level detecting waveform sampling system  
A level detecting waveform digitizer for repetitively sampling an analog waveform and converting analog samples into representative digital data is provided with a predictive time base circuit for...
4794543 Multi level split gate signal processor determining the centroid of a signal  
Successive MLS scanning signals are received as pulse-type analog signals and converted into corresponding digital signals. The centroid of each digital signal is determined at at least two...
4707797 Function generator for NMR system  
A modular function generator for generating a plurality of analog waveforms for use in an NMR imaging system. The function generator includes a plurality of waveform synthesizer modules which are...
4697236 Densitometer with automatic gain and reference value adjustment of analog waveform  
A computer controlled diagnostic densitometer for analyzing optical density patterns of blood samples or the like scans a sample and generates an analog waveform signal representative of the...
4665390 Fire sensor statistical discriminator  
Circuitry for using the statistical properties of detected radiation in the time domain to discriminate between stimuli from fire and non-fire sources. Statistical discriminators for fire sensing...
4658368 Peak position detector  
The position of a peak in a digital signal is determined by a circuit consisting of a finite impulse response filter constructed in accordance with either the expression (1+z -1 )(1+z -2 ) (1-z -5...
4654584 High-speed precision equivalent time sampling A/D converter and method  
A circuit for precisely measuring very high-speed recurring waveforms includes a comparator coupled between an analog input terminal and a successive approximation register. A digital-to-analog...
4647862 Trigger holdoff system for a digital oscilloscope  
A trigger holdoff system particularly useful in digital oscilloscopes is provided in which a holdoff pulse is generated in response to a trigger pulse from a trigger generator and applied to the...
Matches 351 - 400 out of 440 < 1 2 3 4 5 6 7 8 9 >