Class 324/76.44 - With filtering

Subclass of Class 324 - Electricity: measuring and testing
Definition: Subject matter including a selective network of resistors,
No. of patents: 73
Last issue date: 09/30/2008

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Number	Title	Issue Date
7429896	Frequency stability measuring apparatus A frequency stability measuring apparatus for measuring a frequency fluctuation of a signal outputted from a given signal source includes: a reference signal output unit that outputs a reference frequency signal; a mixer that mixes a signal outputted from the signal...	09/30/2008
7254790	Method of moment computations in R(L)C interconnects of high speed VLSI with resistor loops A moment computation technique for general lumped R(L)C interconnect circuits with multiple resistor loops is proposed. Using the concept of tearing, a lumped R(L)C network can be partitioned into a spanning tree and several resistor links. The contributions of netw...	08/07/2007
7222035	Method and apparatus for determining changing signal frequency A method and apparatus for estimating the changing frequency of a signal received by a satellite receiver from, illustratively, positioning system satellites is disclosed that enables a more accurate measurement of the change in frequency of that signal due to movem...	05/22/2007
7177771	Digital dynamic filtering and beat frequency reduction for power monitoring A power metering apparatus meters a power signal in a powered system. A low-pass filter receives the power signal and outputs a filtered signal. The filter implements a corner frequency programmable based on a first clocking signal and anti-aliases high frequency co...	02/13/2007
7123000	Adjacent channel leakage power ratio measuring apparatus, channel power measuring apparatus method, program, and recording medium with recording the program The frequency of an adjacent channel signal is reduced by a down converter (12), wherein the signal (adjacent channel signal) in a predetermined band centered around the adjacent channel frequency passes through a band-pass filter (22). At this time, a...	10/17/2006
7003413	System and method of extraction of nonstationary sinusoids Signal processing techniques and systems and, in particular, an apparatus, system, algorithm and method of extraction of sinusoidal signals of time-varying nature is described. The apparatus, system, algorithm and method provide for extraction of a specified single ...	02/21/2006
6653826	Alternating voltage detector An alternating voltage detector having a sensor for the detection of an electric alternating field, an electrical signal transducer connected to the sensor for signaling an electrical alternating field detected by the sensor, and an indicator unit connect...	11/25/2003
6636816	Vector signal analysis method and apparatus therefor An error-suppression signal measurement system and method therefor is provided. The system transmits a test signal from a first probe, through a device under test, and into a second probe. The probes extract normalization signals from reference signals th...	10/21/2003
6577990	Method for determining launch system velocity, acceleration and displacement certification parameters A method is provided to process system test data to determine certification parameters of the system based on the test data. For a torpedo launch system, the velocity data is generated by a Pressure/Velocity/Displacement housing interfaced with a computer...	06/10/2003
6573697	Method and apparatus for determining the energy of a signal The invention describes two alternative methods and corresponding devices for producing an energy signal yn whose amplitude values represent the energy of an electrical signal sn. A first method and the corresponding device calculate...	06/03/2003
6550036	Pre-conditioner for measuring high-speed time intervals over a low-bandwidth path A pre-conditioner for enabling high-speed time interval measurements in an ATE system having a relatively low-bandwidth pathway between a UUT and a timer/counter includes a frequency divider and a D flip-flop located near the UUT. The frequency divider re...	04/15/2003
6292002	Crystal resonant frequency sensor A method and apparatus for measuring the frequency of a desired resonant mode of a crystal arrangement, or other two-port device, during an automated operation. The crystal arrangement, or other two-port device, is placed into a test circuit and subjected...	09/18/2001
6232762	Method and apparatus for determining the energy of a signal The invention describes two alternative methods and corresponding devices for producing an energy signal yn whose amplitude values represent the energy of an electrical signal sn. A first method and the corresponding device calculate the energy signal yn ...	05/15/2001
6232761	Frequency estimating system An inverse modulator 21, a Fourier transform circuit 22 and a power converter 23 are provided for obtaining a power-frequency spectrum of the carrier wave of a received signal, which is subjected to the influence of fading in the transmission line. A peak...	05/15/2001
6018246	Network analyzer measurement method for high dynamic range devices A measurement method adjusts the IF bandwidth of a network analyzer to increase measurement speed for high dynamic range devices. According to the first preferred embodiment of the present invention, the bandwidth of the IF filter is adjusted for each cor...	01/25/2000
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 generated. In response to the train of generated impulses, th...	08/03/1999
5901219	Method for ring signal detection A reduced complexity method of ring signal detection, in which a digital signal processor monitors an incoming data stream for zero crossings and employs a limiter-discriminator to differentiate ring frequency signals from line noise. Controlled noise is ...	05/04/1999
5761074	Frequency data converter and meter apparatus In one data updating period, an edge pulse signal generator detects an edge of a pulse signal, and generates a one-shot pulse signal. A digital filter performs digital filter processing of the one-shot pulse signal, and outputs one frequency data. An aver...	06/02/1998
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 signal at each of the two frequencies. The samples at the...	02/03/1998
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. The method is based on digital signal processing and determi...	04/16/1996
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 (3, 20) with symmetrically distributed filter coefficient...	11/28/1995
5440229	Fundamental voltmeter Apparatus is disclosed for measuring the fundamental voltage, fundamental frequency and the fundamental voltage divided by the fundamental frequency of the output of a device, such as an inverter. Through the use of an isolation amplifier connected across...	08/08/1995
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 circuit comprises an edge detecting circuit, for outputting an e...	10/18/1994
5300878	Swept signal analysis instrument and method The sweep rate limitations that heretofore have constrained the maximum sweep rates of swept analysis instruments are obviated by optimizing filter circuitry and post-processing the IF signal using various techniques to compensate for errors caused by fas...	04/05/1994
5245278	Device for the processing of a signal coming from a sensor with a derivative type of response The disclosure relates to devices for the measurement of signals in the field of wideband phenomena. More precisely, a device is disclosed for the processing of electrical signals coming from a derivative type of sensor designed to measure an electrical o...	09/14/1993
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 subjected to a known delay ͌ for one of the converters, and b...	03/30/1993
5168215	Instantaneous frequency measurement apparatus and method An apparatus and method for measuring the frequencies of a pair of signals simultaneously present in a composite signal, comprising the steps of includes components for squaring the composite signal, filtering the squared signal for separating a first pas...	12/01/1992
5095263	Anti-aliasing for frequency output sensors A technique for reducing the effects of aliasing in a frequency output sensor system. The system includes a sensor for producing a sensor output signal at a frequency that varies within a modulation range as a function of an input parameter. The system al...	03/10/1992
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 counter, and a frequency range decoder. The filter is a progra...	04/03/1990
4899289	Apparatus for and method of processing signals in a composite waveform including noise and a periodic component The occurrence and frequency of a periodic component embedded in a composite waveform including noise is detected by real time calculating the autocorrelation function of the waveform and deducing the frequency of the periodic component from the value of ...	02/06/1990
4864221	Filter, phase-measuring device and method for application of said filter The present invention concerns mainly a filter, a phase-measuring device and a method to apply said filter. The main object of the invention is a phase-measuring device. The use of adapted filters (140) enables the increasing of the signal/noise ratio of ...	09/05/1989
4859934	Apparatus for measuring the frequency of microwave signals A microwave frequency detection receiver utilizing a prescaler comprised of one or a plurality of cascaded analog frequency dividers for down-converting received microwave signals to a predetermined compressed radio frequency bandwidth, connected to a com...	08/22/1989
4843328	Apparatus for using a time interval counter to measure frequency stability Apparatus for measuring the relative stability of two signals is disclosed comprising means for mixing the two signals down to a beat note sine wave and for producing a beat note square wave whose upcrossings are the same as the sine wave. A source of ref...	06/27/1989
4810960	Measuring adjacent channel power A signal source from a transmitter is down-converted by being mixed with a locally generated signal so that a desired adjacent channel band is converted to base band and the adjacent channel power measured after filtering by a low pass filter. To eliminat...	03/07/1989
4805125	Apparatus and methods for improving uniformity measurements Apparatus and methods for use in measuring the uniformity of a body such as a tire, wheel or the like wherein a waveform related to the uniformity of the body is digitally sampled to acquire a series of data samples, each of which is correlated with a res...	02/14/1989
4792932	Time measurement in automatic test equipment Apparatus for automatically testing electronic circuits and performing time measurements, including a time measuring circuit for counting clock pulses provided between stop and start event edges presented to it, two independent input selectors for each se...	12/20/1988
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 location of the infinite slopes. An adaptive filtering proc...	12/06/1988
4786168	Frequency domain laser velocimeter signal processor A laser velocimeter signal processor for measuring the signal frequency within a signal burst. The input signal is converted to digital by an ADC 16 and then shifted into shift registers 30 and 31. An automatic gain circuit 15 controls the gain of the inp...	11/22/1988
4769760	Terrain biased dynamic multiple threshold synchronization method and apparatus The method and device of the present invention is for synchronizing periodic signals. The method is comprised of the steps of obtaining input signals to be synchronized, delineating a plurality of terrain biased, dynamic threshold points, detecting the ti...	09/06/1988
4759069	Emergency signal warning system A siren detection system is particularly suited for installation in an automobile for providing a warning to the driver when an emergency vehicle is in the vicinity of the automobile. The system includes a microphone mounted on the automobile. The output ...	07/19/1988

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Class 324/76.44 - With filtering