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7355537 Built-in self-test apparatus and method for digital-to-analog converter  
A built-in self-test apparatus for a digital-to-analog converter uses a differentiation unit for differentiating a digital-to-analog (DA) signal to obtain the differences between pulses of the...
7254502 Method and device for detecting period length fluctuations of periodic signals  
To determine the period length of a first signal, the length is measured by counting the periods of a second signal with a shorter period length. To measure the fluctuations of the period length of...
7062164 Detection of data transmission rates using passing frequency-selective filtering  
A data receiver, which could be an optical transceiver, a modem, a router hub, is capable of detecting the transmission rate of incoming data. The data is converted to electrical waves appropriate...
6811291 Detector for signals with harmonically related components  
A processor that utilizes the presence of harmonic components in a noisy signal environment to enhance the desired frequency spectrum of the signal. Received signal and noise are filtered to...
6771061 High speed tester with narrow output pulses  
A tester that is well suited for operation at high speeds or with narrow pulses. The tester includes a state based pulse shaping circuit that combines edge signals into a pulsed output signal. The...
6759838 Phase-locked loop with dual-mode phase/frequency detection  
A phase-locked loop with dual-mode phase/frequency detection is provided. The phase-locked loop circuit includes a dual-mode phase/frequency detector, a loop filter, a voltage-controlled...
6624623 Method and apparatus for digitally measuring the frequency of a signal by integration of its signal phase  
In a method and apparatus for measuring the frequency of a signal by integration of its signal phase, a phase accumulator integrates the signal phase of the signal, at predetermined time intervals....
6574168 Time measuring device and testing apparatus  
A time measuring device includes: an input signal detecting unit for detecting three or more edges in an input signal and to output three or more detection signals in parallel, the three or more...
6486805 Frequency to digital converter  
According to an embodiment of the present invention, an input signal is provided to an oscillator, which creates a count signal with a greater frequency than the input signal. The input signal...
6448757 Precise digital frequency detection  
A digital frequency detector ( 10 ) and method for digitally detecting arbitrarily small phase changes between a signal waveform and a reference waveform. Both the reference waveform and the signal...
6426634 Circuit breaker with integrated self-test enhancements  
A circuit switching device or circuit breaker with integrated self-test enhancements is disclosed having separable contacts operable under processor control to control power to a circuit responsive...
6291981 Automatic test equipment with narrow output pulses  
Automatic test equipment suitable for testing high speed semiconductor devices. The test equipment includes a formatter circuit with a flip flop that produces an output in the desired format even...
6233529 Frequency spectrum analyzer having time domain analysis function  
A spectrum analyzer is provided with a continuous period measurement function which continuously measures time periods of each and every cycle of an IF signal to analyze changes in frequency and...
6115675 Double interpolation anti-skew compensation of sampled analog data points in a protective relay  
A protective relay system comprises current and voltage transducers 10, filters 12, and a multiplexor 14, the latter outputting an interleaved stream of analog phase current and voltage signal...
6026418 Frequency measurement method and associated apparatus  
The frequency measurement method and associated apparatus accurately determines the frequency of a periodic signal even if the frequency exceeds the nyquist frequency, typically established by the...
5845232 Apparatus and method for detecting splice overlaps or splice gaps in a tire  
An apparatus and related method for detecting splice gaps and splice overlaps includes a processor having a memory and a plurality of logic tables, wherein the processor is connected to an...
5832414 Generator protection system and method of compensating for errors in phasor estimation due to oscillations in discrete Fourier transform  
A new method of compensating for errors in phasor estimation due to oscillations caused by discrete fourier transforms used to estimate signal frequency is provided. The method uses a variable...
5832413 Generator protection system and method for phasor estimation and frequency tracking during frequency ramping  
A method for estimating phasors and tracking the frequency of a signal during frequency ramping is provided. The method uses a variable N-point DFT periodically to compute one or more phasors based...
5808895 Method and apparatus for low signal to noise ratio instantaneous phase measurement  
The system and method of the present invention generates high resolution phase measurements without the high processing and memory overhead requirements found in prior art circuits and methods....
5471133 Digital device for measuring the frequency of an electrical signal  
In order to permit rapid, high-resolution measurement of the frequency of an electrical signal using a digital device, the electrical signal is fed to two linear-phase non-recursive digital filters...
5440228 Simultaneous signals IFM receiver using plural delay line correlators  
A simultaneous signals frequency measurement receiver comprising a number n of delay line correlators, with a complete set of n, delays, a number 2n of digitizers, computational means to define an...
5420501 Frequency spectrum analyzer  
A frequency spectrum analyzer wherein an input signal is subjected to A/D conversion, and the converted data is multiplied by a window function; and the thus processed signal is subjected to...
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...
5357196 Circuit for converting a frequency of an input signal so a signal having a digital value corresponding to the frequency  
A measuring circuit with a simple circuit configuration is capable of correcting dispersion of a characteristic of a display apparatus and of displaying the measurement result. The measuring...
5329468 Actual operating time indicator  
An actual operating time indicator includes: a lifting motor for lifting a load up/down; a power detection unit for detecting an input power based on a current and a voltage supplied to the motor,...
5325049 Frequency deviation measuring apparatus  
Based on a desired center frequency and a frequency resolution for a signal to be measured which are entered via an operator section, a micro-CPU calculates the frequency dividing number, a preset...
5245311 Logical comparison circuit for an IC tester  
In the case of setting one comparison timing in one operation period, a select signal is set to the "0" level, by which first, second and third counters are each put in the state of operation of a...
5235287 Frequency measurement receiver with bandwidth improvement through phase shifted sampling of real signals using sampling rate selection  
This is a technique for extending the frequency range which employs a power divider having two outputs, one output being supplied to a first A/D converter, and the other output being supplied via a...
5225768 Field test instrument  
A calibration generator for furnishing signals to tachographs, taximeters and other instruments used in fleet management systems. Calibrated frequencies and amplitudes are provided by the generator...
5218291 Meter and meter driving system with indication fluctuation suppression and enhancement  
A meter driving system receives pulse signals from a sensor, counting frequencies or periods of the input signals. The counted results are weight-averaged to determine an output value and a value...
5198748 Frequency measurement receiver with bandwidth improvement through synchronized phase shifted sampling  
A technique covered by patent applicaton S.N. 07/672,309 divides power of an input signal to two A/D converters. A processor receives the outputs of the two A/D converters. The input signal is...
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...
5165051 Modified fast frequency acquisition via adaptive least squares algorithm  
This is a method and associated apparatus for accurately and quickly estimating the amplitude, frequency and phase of a signal of interest. The method comprises the steps of, inputting the signal...
5128607 Constant events frequency measurement and fast inverse circuit  
A method and apparatus makes rapid frequency measurements by measuring time intervals for a series of blocks of event counts with the number of events in each block held constant. This makes the...
5111134 Method and apparatus for determining the frequency of short oscillation bursts of electrical signals  
In a method and an apparatus for determining the frequency of short oscillation bursts of electrical signals firstly oscillation bursts in desired number are read into a storage means and read out...
5099243 Digital frequency measurement receiver with bandwidth improvement through multiple sampling of complex signals  
This is a technique for extending the frequency range which employs in-phase and quadrature components of the signal coupled with non-uniform sampling to gain the advantages of a high sampling rate...
5099194 Digital frequency measurement receiver with bandwidth improvement through multiple sampling of real signals  
This proposed approach to extending the frequency range uses non-uniform sampling to gain the advantages of a high sampling rate with only a modest increase in the number of samples. The basic idea...
5095264 Frequency counter and method of counting frequency of a signal to minimize effects of duty cycle modulation  
A dual-edge frequency counter and method for minimizing the effects of duty cycle modulation. In its simplest form, a dual-edge counter (50) includes a first counter (52) that accumulates reference...
5089770 Frequency measuring system  
The disclosure is of a system for measuring the frequency of an audio signal by converting the signal to a rectangular wave, counting the number of oscillator pulses which can be generated during...
5077519 Pulse period to frequency conversion system  
A frequency conversion system for converting a pulse period into a frequency value by calculating a reciprocal value of a binary digit value of a pulse period from a remote period counter. The...
5019786 Phase measurement system using a dithered clock  
A phase measurement system which measures the phase shift between two signals by dithering a clock signal and averaging a plurality of measurements of the phase differences between the two signals.
5012808 Pulse generation, parameter determination, and modification system  
A pulse generation and tracking system for connection to an object or a subject under treatment therewith, the waveform being a train of repetitive complex pulses each pulse comprising a large...
4983906 Frequency estimation system  
A signal of interest is periodically sampled and the samples decomposed into quadrature components. The signal's phase angle at each sample is computed from the ratio of the real to imaginary...
4945303 Frequency detector  
A frequency detection device and associated method are disclosed. The frequency detection device divides a time base into a plurality of discrete time bases. Clock pulses are added during the...
4926115 Unique phase difference measuring circuit  
A Unique Phase Difference Measuring Circuit which measures the phase difference between a reference pulse train and a slave pulse train. The present invention includes delay lines that determine...
4926351 Digital processing device for analog input  
A processing module is disclosed for capturing of analog input values, in particular for microprocessing systems and storage-programmable control systems. The control unit (40) comprises a program...
4922195 Extraneous frequency detector  
An extraneous frequency detector especially suited for analyzing the three-phase output of a variable speed constant frequency (VSCF) generator generates in a sample-and-hold circuit amplitude...
4922343 Apparatus for detecting frequency of input signal with a digital scanning G-converter  
A frequency detector is used with a digital scanning converter that enables a monitor receiver having a particular horizontal deflection frequency to monitor various video signals having various...
4914600 Programmable frequency identifier circuit  
A programmable frequency identifier circuit for identifying the frequency of a contaminated signal including a digital finite impulse response filter, a zero crossing detector, a zero crossing...
4895060 Electronic device of a type in which musical tones are produced in accordance with pitches extracted from input waveform signals  
A musical tone generating device generates musical tones of a frequency in accordance with pitches which are extracted from input waveform signals by a pitch extracting means. When a pitch...
Matches 1 - 50 out of 302 1 2 3 4 5 6 7 >