Amplitude Distribution Patents (Class 324/76.13)
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Patent number: 12078677Abstract: Techniques for determining the input threshold voltage level of an integrated circuit device may include configuring a voltage drive level and a load current for a tester channel of automated test equipment (ATE) connected to an input pin of an integrated circuit device, and executing a test pattern. The test pattern may include test vectors for generating a set of voltage ramps at the input pin by the tester channel using the load current and the voltage drive level. The set of voltage ramps can be characterized by different lengths and different amplitudes. The test pattern may also include test vectors for checking output values on an output pin of the integrated circuit device after each voltage ramp of the set of voltage ramps. The input threshold voltage level of the input pin can be determined based on results of executing the test pattern.Type: GrantFiled: June 29, 2021Date of Patent: September 3, 2024Assignee: Amazon Technologies, Inc.Inventors: Brendan Tully, Amandeep Saluja
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Patent number: 11976629Abstract: A method for determining a relative position of wind sensors on a wind turbine comprising: obtaining wind data from each of at least two wind sensors installed on a wind turbine at a location where airflow is affected by a rotor of the wind turbine, the obtaining occurring while the rotor is rotating, identifying oscillations in the wind data from each of the wind sensors, determining a phase or amplitude difference between the oscillations, and determining a relative position of the wind sensors based on the phase or amplitude difference.Type: GrantFiled: July 7, 2020Date of Patent: May 7, 2024Assignee: Vestas Wind Systems A/SInventors: Ines Pinto Frutuoso, Johnny Nielsen, Jens Van Schelve
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Patent number: 11906655Abstract: The invention relates to a radar system for capturing surroundings of a moving object, in particular a vehicle and/or a transportation apparatus, such as a crane, in particular, wherein the system is mounted or mountable on the moving object, wherein the radar system comprises at least two non-coherent radar modules (RM 1, RM 2, . . . RM N) having at least one transmitter antenna and at least one receiver antenna, wherein the radar modules (RM 1, RM 2, . . . RM N) are arranged or arrangeable in distributed fashion on the moving object, wherein provision is made of at least one evaluation device which is configured to process transmitted and received signals of the radar modules to form modified measurement signals in such a way that the modified measurement signals are coherent in relation to one another.Type: GrantFiled: February 28, 2018Date of Patent: February 20, 2024Assignee: Symeo GmbHInventors: Martin Vossiek, Michael Gottinger, Peter Gulden, Mark Christmann, Christoph Mammitzsch
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Patent number: 11694117Abstract: A waveform generation identification method includes: comparing individual waveform data obtained by a plurality of sensors, with at least one piece of characteristic waveform information; determining appearance probability of characteristic waveform information in at least a certain section of the waveform data, based on a degree of correlation between a peak section of the waveform data and the characteristic waveform information; and identifying a time when a section matching with the characteristic waveform information appears and a concerned sensor, based on the appearance probability.Type: GrantFiled: October 29, 2020Date of Patent: July 4, 2023Assignee: RICOH COMPANY, LTD.Inventors: Ryoji Hirano, Masayuki Hirata, Otoichi Nakata
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Patent number: 11595153Abstract: A method implemented in a computer system includes training a network, which is obtained by unfolding an iterative algorithm for demodulation or demodulation and decoding, using a machine learning technique with a loss function that takes into account non-Gaussianity of a log-likelihood ratio (LLR) distribution calculated from an output of the network. The method further includes producing a first set of learned parameters of that iterative algorithm.Type: GrantFiled: February 16, 2022Date of Patent: February 28, 2023Assignees: NEC CORPORATION, OSAKA UNIVERSITY, THE DOSHISHAInventors: Kazushi Muraoka, Takanobu Doi, Naoto Ishii, Takumi Takahashi, Seiichi Sampei, Shinsuke Ibi
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Patent number: 11556809Abstract: A method for estimating a brain activity response following a stimulus of a person comprises the steps: providing a usage data set of the person from a personal device used by said person, wherein at least one usage attribute is associated to said usage data set, wherein attribute data is associated to each of the at least one usage attribute, providing a computational inference model, generated from a plurality of brain activity data sets and a plurality of usage data sets, wherein each brain activity data set comprises data derived from a brain activity response following a sensory stimulus, submitting the attribute data of each of the at least one usage attributes to said computational inference model, estimating a brain activity response following a sensory stimulus of said person by evaluating said computational inference model for the submitted attribute data. The method is useful to determine, for example the influence of intensive touch pad usage (of a smartphone) on somatosensory evoked potentials.Type: GrantFiled: December 14, 2015Date of Patent: January 17, 2023Inventors: Arko Ghosh, Eric Rouillier, Magali Chytiris, Myriam Balerna, Anne-Dominique Gindrat
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Patent number: 11409012Abstract: Disclosed are methods, systems, and computer-readable medium to perform operations including: decomposing the seismic data into a plurality of sub-volumes, each sub-volume associated with a respective one of the plurality of frequency components; identifying a portion of the seismic data that includes one or more multiples, the multiples being seismic data associated with multiply reflected seismic energy; identifying, based on the plurality of sub-volumes, the one or more multiples within the portion of the seismic data; and determining, from the plurality of frequency components, a single frequency that gives rise to a predetermined continuity along a primary reflector affected by the one or more multiples.Type: GrantFiled: October 21, 2019Date of Patent: August 9, 2022Assignee: Saudi Arabian Oil CompanyInventors: Mohammed Saleh Bin Gubair, Maher Al Marhoon
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Patent number: 11165512Abstract: A wireless communication identification device includes a sensor unit configured to receive wireless signals from a plurality of wireless communication devices at a plurality of positions and to thereby detect the radio-waveform feature quantity and the radio-field intensity; a storage unit configured to store the radio-waveform feature quantity and the radio-field intensity as the history information; and a clustering part configured to apply a likelihood function including a correlation coefficient of the time-series radio-waveform feature quantity of wireless signals received at a plurality of positions to the history information and to thereby carry out clustering of the radio-waveform feature quantity for each wireless communication device serving as a transmission source of wireless signals.Type: GrantFiled: May 20, 2019Date of Patent: November 2, 2021Assignee: NEC CORPORATIONInventor: Tatsuya Soma
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Patent number: 11144526Abstract: Methods and apparatus consistent with the invention provide the ability to organize, index, search, and present time series data based on searches. Time series data are sequences of time stamped records occurring in one or more usually continuous streams, representing some type of activity. In one embodiment, time series data is organized into discrete events with normalized time stamps and the events are indexed by time and keyword. A search is received and relevant event information is retrieved based in whole or in part on the time indexing mechanism, keyword indexing mechanism, or statistical indices calculated at the time of the search.Type: GrantFiled: January 31, 2019Date of Patent: October 12, 2021Assignee: Splunk Inc.Inventors: Erik M. Swan, R. David Carasso, Robin Kumar Das, Rory Greene, Bradley Hall, Nicholas Christian Mealy, Brian Philip Murphy, Stephen Phillip Sorkin, Andre David Stechert, Michael Joseph Baum
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Patent number: 11138334Abstract: A method includes removing sensitive information from an audio recording. The method includes receiving a digitally encoded audio recording; transcoding, if necessary, the audio recording to a pre-defined audio format; identifying periods of voice in/activity in the audio recording; segregating the audio recording into a sequence of separated utterances or words; streaming the sequence of separated utterances or words to an ASR server; receiving, for each streamed utterance or word, an associated ASR decoding; receiving, for each ASR decoding, an associated confidence score indicative of a probability that the associated ASR decoding is correct; identifying for redaction; any ASR decoding that contains sensitive information, and any ASR decoding with a confidence score less than a redaction threshold; and preparing a redacted audio recording by eliminating or masking those word(s) and/or utterance(s) for which an associated ASR decoding was identified for redaction.Type: GrantFiled: October 17, 2018Date of Patent: October 5, 2021Assignee: Medallia, Inc.Inventors: David Garrod, Jay R. Pascarella
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Patent number: 11119151Abstract: A method for at least one of identifying and compensating for system errors in a measurement system is disclosed, wherein the measurement system comprises a signal generator and a signal analyzer. The method comprises: generating a test signal via the signal generator, the test signal having predetermined properties; forwarding the test signal to a device under test; processing the test signal via the device under test, thereby generating a transmission signal; receiving the transmission signal via the signal analyzer; determining a response function of the device under test based on the test signal and based on the transmission signal; and determining at least one periodic component of the response function. Further, a measurement system as well as a calibration system are disclosed.Type: GrantFiled: December 2, 2019Date of Patent: September 14, 2021Assignee: Rohde & Schwarz GmbH & Co. KGInventors: Andreas Lagler, Florian Ramian
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Patent number: 10728705Abstract: In order to acquire a feature containing only a fluctuation component of a radio wave signal from received data, a feature quantity measuring device calculates the feature, based on data in a predetermined time span of time series data from a received communication signal, and calculates a degree of similarity between the feature and supervised data representing a preset feature when there is a fading variation. In addition, the feature quantity measuring device determines, based on a comparison result indicating a magnitude relationship between the degree of similarity and a predetermined threshold value, whether a characteristic of the fading variation is contained within the time span and, when the characteristic is not contained, outputs the feature for the time span.Type: GrantFiled: May 10, 2017Date of Patent: July 28, 2020Assignee: NEC CORPORATIONInventor: Kenta Tsukamoto
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Patent number: 10620240Abstract: A load monitoring system for a facility includes a computer system configured to execute a model of the object, the model configured to estimate a state of the object as a function of measured values of at least one characteristic of the object, receive at least one measured value of the at least one characteristic of the object, and execute, by the computer system, the model to compute an estimated state of the object.Type: GrantFiled: January 18, 2013Date of Patent: April 14, 2020Assignee: SCHNEIDER ELECTRIC USA, INC.Inventors: John C. Van Gorp, Jeffrey W. Yeo, Peter Tovey
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Patent number: 10389363Abstract: A temperature-compensated oscillator includes a resonator element, an oscillating circuit, and a temperature compensation circuit, and in a case of varying temperature in a temperature range of ±5° C. centered on a reference temperature in intervals of 6 minutes, and assuming observation period as ?, a wander performance fulfills a condition that an MTIE value is equal to or shorter than 6 ns in a range of 0 s<??0.1 s, the MTIE value is equal to or shorter than 27 ns in a range of 0.1 s<??1 s, the MTIE value is equal to or shorter than 250 ns in a range of 1 s<??10 s, the MTIE value is equal to or shorter than 100 ns in a range of 10 s<??1700 s, and the MTIE value is equal to or shorter than 6332 ns in a range of 100 s<??1000 s.Type: GrantFiled: March 6, 2017Date of Patent: August 20, 2019Assignee: SEIKO EPSON CORPORATIONInventors: Takuya Owaki, Naohisa Obata
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Patent number: 10385853Abstract: A rotary machine abnormality detection device capable of determining abnormality with higher accuracy, a method thereof, and a rotary machine provided therewith. A rotary machine abnormality detection device detects abnormality in a rotary machine M having at least first and second rotating bodies using a specific feature amount based on a frequency spectrum of measurement data of vibration. The device obtains, from the frequency spectrum, a fundamental wave component F1 of a fundamental wave lobe mesh frequency f1 and n-th harmonic wave components Fn of n-th harmonic wave lobe mesh frequencies fn up to XAB, and obtains the specific feature amount based on these components. The f1 is obtained by dividing a rotational frequency by a teeth number of the first rotating body and the XAB represents the least common multiple of the teeth numbers of the two rotating bodies.Type: GrantFiled: November 8, 2016Date of Patent: August 20, 2019Assignee: Kobe Steel, Ltd.Inventors: Kaname Araki, Eiji Takahashi, Shugo Takaki, Masato Hayashi
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Patent number: 10371731Abstract: An RF processing module that when coupled to a computer having appropriate signal processing software will function as a spectrum analyzer. The RF processing module has a first stage mixer and a switch that allows either port of the first stage mixer to be selected as the input and receive the RF signal. The RF processing module has a sample packing buffer that packs digitized signal samples into a fewer number of longer words and loads the words into a circular buffer and from then to one of two DMA channels on a USB link. The circular buffer can be emptied faster than it can be filled, allowing the sample packing buffer to create time intervals for a USB controller to switch DMA channels. LO leakage through the mixer-to-IF path is used to self-calibrate the filter's frequency response as temperature and other environmental factors change.Type: GrantFiled: May 24, 2018Date of Patent: August 6, 2019Assignee: SINGAL HOUND, INC.Inventor: Justin Crooks
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Patent number: 10361841Abstract: A computing apparatus outputs ?1 and ?2 corresponding to a ciphertext x, a capability providing apparatus uses ?1 to correctly compute f(?1) with a probability greater than a certain probability and sets the result of the computation as z1, uses ?2 to correctly compute f(?2) with a probability greater than a certain probability and sets the result of the computation as z2, the computing apparatus generates a computation result u=f(x)bx1 from z1, generates a computation result v=f(x)ax2 from z2, and outputs ub?va? if the computation results u and v satisfy a particular relation, where G and H are groups, f(x) is a function for obtaining an element of the group G for x?H, X1 and X2 are random variables having values in the group G, x1 is a realization of the random variable X1, and x2 is a realization of the random variable X2.Type: GrantFiled: August 23, 2017Date of Patent: July 23, 2019Assignee: NIPPON TELEGRAPH AND TELEPHONE CORPORATIONInventors: Go Yamamoto, Tetsutaro Kobayashi
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Patent number: 10313106Abstract: A computing apparatus outputs ?1 and ?2 corresponding to a ciphertext x, a capability providing apparatus uses ?1 to correctly compute f(?1) with a probability greater than a certain probability and sets the result of the computation as z1, uses ?2 to correctly compute f(?2) with a probability greater than a certain probability and sets the result of the computation as z2, the computing apparatus generates a computation result u=f(x)bx1 from z1, generates a computation result v=f(x)ax2 from z2, and outputs ub?va? if the computation results u and v satisfy a particular relation, where G and H are groups, f(x) is a function for obtaining an element of the group G for x?H, X1 and X2 are random variables having values in the group G, x1 is a realization of the random variable X1, and x2 is a realization of the random variable X2.Type: GrantFiled: August 23, 2017Date of Patent: June 4, 2019Assignee: NIPPON TELEGRAPH AND TELEPHONE CORPORATIONInventors: Go Yamamoto, Tetsutaro Kobayashi
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Patent number: 10116401Abstract: A device that measures an electromagnetic near-field emitted from a measurement object and evaluates electromagnetic interference, the device including mask setting unit that converts a predetermined communication performance value into an amplitude probability distribution mask and setting a converted amplitude probability distribution mask as a permissible level; acquisition unit that acquires time-series measurement data of electromagnetic radio interference in connection with a measurement position coordinate; amplitude probability distribution calculation unit that calculates an amplitude probability distribution of the electromagnetic radio interference for each measurement position coordinate based on the time-series measurement data; determination unit that determines a magnitude relation between the amplitude probability distribution mask and the amplitude probability distribution for each measurement position coordinate and outputting as a determination result; and mapping process unit that acquiresType: GrantFiled: July 17, 2015Date of Patent: October 30, 2018Assignee: NEC CORPORATIONInventor: Kenta Tsukamoto
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Patent number: 9960906Abstract: A computing apparatus outputs ?1 and ?2 corresponding to a ciphertext x, a capability providing apparatus uses ?1 to correctly compute f(?1) with a probability greater than a certain probability and sets the result of the computation as z1, uses ?2 to correctly compute f(?2) with a probability greater than a certain probability and sets the result of the computation as z2, the computing apparatus generates a computation result u=f(x)bx1 from z1, generates a computation result v=f(x)ax2 from z2, and outputs ub?va? if the computation results u and v satisfy a particular relation, where G and H are groups, f(x) is a function for obtaining an element of the group G for x?H, X1 and X2 are random variables having values in the group G, x1 is a realization of the random variable X1, and x2 is a realization of the random variable X2.Type: GrantFiled: December 22, 2016Date of Patent: May 1, 2018Assignee: NIPPON TELEGRAPH AND TELEPHONE CORPORATIONInventors: Go Yamamoto, Tetsutaro Kobayashi
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Patent number: 9922066Abstract: Methods and apparatus consistent with the invention provide the ability to organize, index, search, and present time series data based on searches. Time series data are sequences of time stamped records occurring in one or more usually continuous streams, representing some type of activity. In one embodiment, time series data is organized into discrete events with normalized time stamps and the events are indexed by time and keyword. A search is received and relevant event information is retrieved based in whole or in part on the time indexing mechanism, keyword indexing mechanism, or statistical indices calculated at the time of the search.Type: GrantFiled: January 27, 2016Date of Patent: March 20, 2018Assignee: Splunk Inc.Inventors: Erik M. Swan, R. David Carasso, Robin Kumar Das, Rory Greene, Bradley Hall, Nicholas Christian Mealy, Brian Philip Murphy, Stephen Phillip Sorkin, Andre David Stechert, Michael Joseph Baum
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Patent number: 9905108Abstract: Methods, systems, and apparatus for monitoring fatigue and notifying an individual are described. The individual may be an operator of a vehicle, equipment, or machine, a student, or other person that may experience fatigue. In addition to the individual, another person such as an employer, teacher, or parent may be notified.Type: GrantFiled: September 9, 2015Date of Patent: February 27, 2018Assignee: Torvec, Inc.Inventors: Richard A. Kaplan, Douglas A. Hemink, Matt Kenyon
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Patent number: 9882606Abstract: Disclosed is hybrid communication in which a first message from a guided surface wave probe node is embedded in a guided surface wave, and a second message from a guided surface wave receive node uses a different messaging mechanism.Type: GrantFiled: August 31, 2016Date of Patent: January 30, 2018Assignee: CPG TECHNOLOGIES, LLCInventors: James F. Corum, Kenneth L. Corum, Basil F. Pinzone, Jr., Joseph F. Pinzone
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Patent number: 9794060Abstract: A computing apparatus outputs ?1 and ?2 corresponding to a ciphertext x, a capability providing apparatus uses ?1 to correctly compute f(?1) with a probability greater than a certain probability and sets the result of the computation as z1, uses ?2 to correctly compute f(?2) with a probability greater than a certain probability and sets the result of the computation as z2, the computing apparatus generates a computation result u=f(x)bx1 from z1, generates a computation result v=f(x)ax2 from z2, and outputs ub?va? if the computation results u and v satisfy a particular relation, where G and H are groups, f(x) is a function for obtaining an element of the group G for x?H, X1 and X2 are random variables having values in the group G, x1 is a realization of the random variable X1, and x2 is a realization of the random variable X2.Type: GrantFiled: December 22, 2016Date of Patent: October 17, 2017Assignee: NIPPON TELEGRAPH AND TELEPHONE CORPORATIONInventors: Go Yamamoto, Tetsutaro Kobayashi
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Patent number: 9794884Abstract: An envelope tracking transceiver dynamically adjusts envelope tracking parameters to achieve the desired tradeoff between noise performance and power efficiency. When higher levels of noise are acceptable, the envelope tracking transceiver dynamically adjusts transmitter parameters to achieve better power efficiency while sacrificing noise performance. When lower levels of noise are desired, the envelope tracking transceiver dynamically adjusts parameters to achieve better noise performance while sacrificing efficiency.Type: GrantFiled: February 17, 2016Date of Patent: October 17, 2017Assignee: QUANTANCE, INC.Inventor: Serge Francois Drogi
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Patent number: 9687163Abstract: Epileptogenic source localization methods and systems based on ECoG signals are provided for obtaining spatial and temporal relationships among epileptogenic zones. Seizure detection is based on an Independent Component Analysis (ICA) and temporal and spatial relationships among the detected epileptogenic zones are based on a steepest descent-based source localization method. Embodiments of the invention facilitate the epileptiform activity investigation and seizure dynamics study and further benefit the neurophysiology community in the surgical decision making of neurosurgeons.Type: GrantFiled: October 30, 2013Date of Patent: June 27, 2017Assignee: THE REGENTS OF THE UNIVERSITY OF CALIFORNIAInventors: Yu Han, Wentai Liu, Yue-Loong Hsin
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Patent number: 9607158Abstract: A computing apparatus outputs ?1 and ?2 corresponding to a ciphertext x, a capability providing apparatus uses ?1 to correctly compute f(?1) with a probability greater than a certain probability and sets the result of the computation as z1, uses ?2 to correctly compute f(?2) with a probability greater than a certain probability and sets the result of the computation as z2, the computing apparatus generates a computation result u=f(x)bx1 from z1, generates a computation result v=f(x)ax2 from z2, and outputs ub?va? if the computation results u and v satisfy a particular relation, where G and H are groups, f(x) is a function for obtaining an element of the group G for x?H, X1 and X2 are random variables having values in the group G, x1 is a realization of the random variable X1, and x2 is a realization of the random variable X2.Type: GrantFiled: October 25, 2011Date of Patent: March 28, 2017Assignee: NIPPON TELEGRAPH AND TELEPHONE CORPORATIONInventors: Go Yamamoto, Tetsutaro Kobayashi
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Patent number: 9443490Abstract: Disclosed is a test and measurement instrument that includes a signal input structured to receive a modulated radio frequency (RF) signal under test and a demodulator structured to extract a digital signal from the received modulated RF signal. The extracted digital signal has a measurable parameter. The instrument also includes a display controller structured to display the extracted demodulated signal at one of at least two different intensities based on the measured parameter of the digital signal. In other embodiments the signal need not be an RF signal. Methods of operation are also described.Type: GrantFiled: June 29, 2012Date of Patent: September 13, 2016Assignee: TEKTRONIX, INC.Inventors: Benjamin A. Ward, Kenneth P. Dobyns, Gary J. Waldo
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Patent number: 9341162Abstract: A method is disclosed for controlling a fundamental frequency of power supply grid being operatively connected to a power supply grid. The method includes determining a variation of active power at one or more locations within the power supply grid, updating based on the determination a calculation of at least one of a steady-state and a dynamic-state related coefficient parameter of the power supply grid, and determining, using a frequency controller of the wind turbine facility and based on the updated calculation, an amount of active power to inject into the power supply grid corresponding to a desired fundamental frequency of the power supply grid.Type: GrantFiled: March 25, 2010Date of Patent: May 17, 2016Assignee: Vestas Wind Systems A/SInventor: Jorge Martinez Garcia
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Patent number: 8872699Abstract: Performing power quality and synchrophasor analysis on a resampled signal. A first signal may be initially received which corresponds to a power system. The first signal may have a plurality of cycles and may have a frequency that varies over time. One or more parameters may be determined from the first signal. Based on the one or more parameters, the first signal may be resampled to produce an even angle signal. Various power quality measurements may be performed on the even angle signal. Similarly, further processing may be performed to perform synchrophasor measurements, e.g., to determine phasor, frequency, and/or rate of frequency change for the first signal. In some embodiments, the resampling processing elements (e.g., circuitry, programmable hardware elements, processors and memories, etc.) may be shared between the two analyses.Type: GrantFiled: December 15, 2011Date of Patent: October 28, 2014Assignee: National Instruments CorporationInventors: Qiao Guo, Chen Zhang, Yijun Shi
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Patent number: 8810447Abstract: A calibration device, capable of calibrating a gain of a radiometer, includes an actuator and a micro-electromechanical-system (MEMS) unit. The actuator receives a calibration signal outputted from a control unit. The MEMS unit is coupled to the actuator, in which the actuator enables the MEMS unit to shield an antenna of the radiometer according to the calibration signal, such that the radiometer generates an environmental signal according to an equivalent radiant temperature received from the MEMS unit, and the control unit calibrates the gain of the radiometer according to the environmental signal.Type: GrantFiled: June 19, 2012Date of Patent: August 19, 2014Assignee: Industrial Technology Research InstituteInventors: Chun-Yen Huang, Chin-Chung Nien, Li-Yuan Chang, Chen-Ming Li, Ya-Chung Yu
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Publication number: 20140159702Abstract: A pixel cell, and a method of use thereof, the pixel cell including: an output, a photosensor configured to generate a first measuring current in a first measurement cycle and a second measuring current in a second measurement cycle as a function of radiation, an output node, a power storage device configured so that in a first operating mode a current can be injected by the power storage device as a function of the first measuring current, and so that in a second operating mode the power storage device is configured to hold the injected current so that the injected current can be detected at the output node, and a switching unit configured to form a difference between the injected current and the second measuring current at the output node in a reading cycle and to couple the output node to the output.Type: ApplicationFiled: December 24, 2013Publication date: June 12, 2014Inventor: Jens Doege
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Patent number: 8704533Abstract: A testing method or apparatus utilizes multiple frequencies applied to a device under test for measuring newly discovered frequency modulation effects. An embodiment may include a lower frequency signal with a smaller amplitude higher frequency signal to test a dynamic change in frequency response, gain, and or phase. This dynamic test can reveal frequency modulation effects. Another embodiment may include the use of a multiple frequency signal to dynamically induce a time varying phase or frequency distortion for the device that has differential phase distortion. The device's output is then measured with an FM detector or spectrum analysis system to measure a shift in one of the frequencies used in the test signal or to measure frequency modulation effects of any signals, including distortion products, from the device.Type: GrantFiled: February 17, 2010Date of Patent: April 22, 2014Inventor: Ronald Quan
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Patent number: 8489350Abstract: An RF test and measurement device, including a front end for receiving a time-varying signal and a real-time engine for generating digital frequency domain spectrums based on the time-varying signal. The device also includes a memory subsystem containing a frequency domain bitmap which is updated through sequential receipt and storage of the digital frequency domain spectrums. The real time engine is further configured to monitor the frequency domain bitmap for occurrence of a signal characteristic, and in response to detection of the signal characteristic, cause a capture of the time-varying signal into a storage location of the RF test and measurement device.Type: GrantFiled: September 28, 2009Date of Patent: July 16, 2013Assignee: Tektronix, Inc.Inventors: Kathryn A. Engholm, Edward C. Gee, Alfred K. Hillman, Jr., David Eby
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Publication number: 20130154878Abstract: Performing power quality and synchrophasor analysis on a resampled signal. A first signal may be initially received which corresponds to a power system. The first signal may have a plurality of cycles and may have a frequency that varies over time. One or more parameters may be determined from the first signal. Based on the one or more parameters, the first signal may be resampled to produce an even angle signal. Various power quality measurements may be performed on the even angle signal. Similarly, further processing may be performed to perform synchrophasor measurements, e.g., to determine phasor, frequency, and/or rate of frequency change for the first signal. In some embodiments, the resampling processing elements (e.g., circuitry, programmable hardware elements, processors and memories, etc.) may be shared between the two analyses.Type: ApplicationFiled: December 15, 2011Publication date: June 20, 2013Inventors: Qiao Guo, Chen Zhang, Yijun Shi
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Publication number: 20130100564Abstract: A device includes interface circuitry. The interface circuitry receives first input signals related to measurements of characteristics of electricity passing through a first power line. The device includes filtering circuitry that filters the first input signals to generate filtered data. The device also includes a processor that estimates an oscillation frequency of the filtered data via a time-domain frequency estimation method.Type: ApplicationFiled: October 19, 2011Publication date: April 25, 2013Applicant: General Electric CompanyInventors: Zhiying Zhang, llia Voloh, Jorge Eduardo Cardenas Medina
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Patent number: 8219332Abstract: Electromagnetic field distribution is measured by considering time variations of a measured electric and/or magnetic field value. In response to scanning performed with a probe at an arbitrary set of measurement coordinates in a predetermined measurement plane in the vicinity of an object to be measured, a signal is detected at each of plural sets of coordinates in a measurement plane. Electric and magnetic fields are computed during a measurement time period at each set of measurement coordinates in the measurement plane based on measurement coordinates where the probe is positioned and the signal is detected with the probe. Amplitude probability distribution during the time period at each set of measurement coordinates in the vicinity of the object is computed based on the computed intensity, then mapped and displayed.Type: GrantFiled: January 31, 2011Date of Patent: July 10, 2012Assignee: Taiyo Yuden Co., Ltd.Inventors: Satoshi Kazama, Keigo Hori, Hiroshi Tsutagaya
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Publication number: 20120169059Abstract: The present invention concerns a method of detecting electric variables of a three-phase AC network having a first, a second and a third phase, including the steps of measuring a respective voltage value of the first, second and third phases in relation to a neutral conductor at a first moment in time, transforming the three voltage values of the first moment in time into polar co-ordinates with a voltage amplitude and a phase angle, repeating measurement and transformation for at least one further moment in time, and determining the currently prevailing frequency, voltage amplitude and/or phase angle of at least one of the phases from the voltage values transformed into polar co-ordinates.Type: ApplicationFiled: June 23, 2010Publication date: July 5, 2012Inventors: Alfred Beekmann, Volker Diedrichs
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Publication number: 20120166119Abstract: An apparatus, method and system for reducing discontinuities between waveforms in a communication system. In one embodiment, an apparatus includes a processor and memory including computer program code. The memory and the computer program code are configured, with the processor, to determine an amplitude and set of derivatives at an end point of a first symbol waveform, and determine an amplitude and set of derivatives at a beginning point of a second symbol waveform. The memory and the computer program code are configured, with the processor, to insert a guard period waveform having an amplitude and set of derivatives at a first end to substantially match the amplitude and set of derivatives at the end point of the first symbol waveform and an amplitude and set of derivatives at a second end that substantially matches the amplitude and set of derivatives at the beginning point of the second symbol waveform.Type: ApplicationFiled: December 23, 2010Publication date: June 28, 2012Inventors: Markus Nentwig, Risto Wichman
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Patent number: 8120349Abstract: A waveform measuring apparatus includes: a digital filter for removing a large-amplitude changing component from an input signal and for outputting a resultant output signal with a small-amplitude noise component left therein; a window generating section for receiving a differential signal between this input signal and the resultant output signal of the digital filter and for generating a window indicating a position of an edge portion of the differential signal; and a ringing measurement section for extracting, from the resultant output signal of the digital filter, a portion of waveform which is indicated by the window generated by the window generating section and for measuring at least a peak-to-peak amplitude of the portion of waveform.Type: GrantFiled: May 29, 2008Date of Patent: February 21, 2012Assignee: International Business Machines CorporationInventors: Tomoaki Kimura, Tadayuki Okada
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Patent number: 8072205Abstract: A peak-to-average measurement system includes an envelope detector to extract the modulation envelope of an input signal having a modulated carrier. The resulting baseband envelope signal is applied to a peak detector and an averaging circuit. In one embodiment, the averaging circuit includes a translinear core to generate a squared signal in response to the envelope signal and an RMS-average circuit to perform the averaging portion of an RMS function. The translinear core may also generate a replicated version of the envelope signal for the peak detector. The use of a common envelope detector for both the peak detector and averaging circuit may provide improved scaling accuracy.Type: GrantFiled: July 1, 2010Date of Patent: December 6, 2011Assignee: Analog Devices, Inc.Inventors: Sukhjinder Deo, Barrie Gilbert, John Cowles
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Patent number: 8073641Abstract: Electromagnetic field distribution is measured by considering time variations of a measured electric and/or magnetic field value. In response to scanning performed with a probe at an arbitrary set of measurement coordinates in a predetermined measurement plane in the vicinity of an object to be measured, a signal is detected at each of plural sets of coordinates in a measurement plane. Electric and magnetic fields are computed during a measurement time period at each set of measurement coordinates in the measurement plane based on measurement coordinates where the probe is positioned and the signal is detected with the probe. Amplitude probability distribution during the time period at each set of measurement coordinates in the vicinity of the object is computed based on a computed intensity, then mapped and displayed.Type: GrantFiled: January 11, 2006Date of Patent: December 6, 2011Assignee: Taiyo Yuden Co., Ltd.Inventors: Satoshi Kazama, Keigo Hori, Hiroshi Tsutagaya
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Patent number: 7952443Abstract: An assistant measuring circuit for an oscillator is provided. The oscillator provides N oscillating signals with different phases. The assistant measuring circuit includes N buffers, N reflection-type modulators, and a controller. An ith buffer among the N buffers receives and further transmits an ith oscillating signal among the N oscillating signals. An ith modulator among the N modulators has an ith signal input end, an ith signal output end, and an ith signal control end. The ith oscillating signal is transmitted to the ith signal input end through the ith buffer. The signal output ends of the N modulators are all electrically connected to a measuring end. The controller is used for providing an ith control signal to the ith signal control end.Type: GrantFiled: October 23, 2008Date of Patent: May 31, 2011Assignee: National Central UniversityInventors: Hong-Yeh Chang, Chi-Hsien Lin
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Patent number: 7945407Abstract: Sets of time domain data of respective frequency bands from Fd-1 to Fd-n of a periodic input signal Fs are acquired. Sets of the time domain data of the common frequency band are extracted from the sets of the time domain data of the frequency bands Fd-1 and Fd-2 in the acquired frequency bands. Correlativity between the sets of the time domain data of the common frequency band is determined while shifting time relationship between the sets each other to identify the sets of time domain data having correspondence relationship. The sets of the time domain data having the correspondence relationship in the time domain data of the adjacent frequency band Fd-1 and Fd-2 are converted to the sets of the frequency domain data respectively, and the sets of the frequency domain data are combined to produce one set of combined frequency domain data.Type: GrantFiled: September 19, 2007Date of Patent: May 17, 2011Assignee: Tektronix, IncInventors: Miyake Kenichi, Hiroyuki Yamagaki, Kuniharu Hori
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Patent number: 7877698Abstract: A system comprising user interface software configured to provide a plurality of spectral data display and manipulation options on a display displaying spectral data, a user interface processor configured to display a pictorial representation of the spectral data display and manipulation options, and a user interface instruction engine configured to provide a plurality of data display and manipulation instructions to the user interface processor to provide display and manipulation of the displayed spectral data. The plurality of data display and manipulation instructions are received from a control device connected to a computing system and the manipulation of the displayed spectral data is based on a user response to the displayed spectral data manipulation options or a pre-determined selection of the displayed spectral data display manipulation options.Type: GrantFiled: October 9, 2007Date of Patent: January 25, 2011Assignee: Meta Geek, LLCInventors: Ryan Woodings, Christian Harrison, Brian Tuttle
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Patent number: 7876173Abstract: The present invention can control the power of an output from a device, which changes the amplitude of an input and outputs a result of the change, according to the frequency of the input so that the power is close to a desired value.Type: GrantFiled: August 29, 2008Date of Patent: January 25, 2011Assignee: Advantest CorporationInventors: Masahiko Muto, Kiyoshi Hashiba, Takashi Kusaka
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Patent number: 7822560Abstract: Techniques and apparatuses for wind turbine component fatigue load measurement and assessment are disclosed. In one embodiment the component is a tower, fore-aft and side-to-side signals from a two-axis accelerometer attached to a bedplate of a wind turbine are used to measure tower fatigue loads. A yaw axis azimuth position signal can also be used for tower fatigue load measurement and assessment.Type: GrantFiled: December 23, 2004Date of Patent: October 26, 2010Assignee: General Electric CompanyInventor: David Lawrence LeMieux
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Publication number: 20100188070Abstract: A method measures a level of an electric measurement variable that can be changed over time, particularly an electric voltage or an electric current. A measurement signal of the measurement variable is differentiated and a current amplitude value of the differentiated measurement variable is determined. Through the iterative approximation of a comparison value to the current amplitude value a level value of the measurement variable is determined.Type: ApplicationFiled: April 7, 2008Publication date: July 29, 2010Inventors: Klaus-Peter Linzmaier, Axel Voges
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Publication number: 20100176789Abstract: Analyzing a device under test (“DUT”) at higher frequencies. A phase shifter varies the phase of a standing wave on a transmission line coupled to the DUT. The standing wave magnitude is sampled at each of the phase shifts and one or more DUT characteristics are determined as a function of the sampled magnitudes and phase shifts. Further aspects include a related phase shifter comprising a waveguide having a plurality of sub-resonant slots formed therein and having active elements for loading the slots to control the phase shift applied to the signal.Type: ApplicationFiled: January 15, 2009Publication date: July 15, 2010Applicant: THE CURATORS OF THE UNIVERSITY OF MISSOURIInventors: Reza Zoughi, Mohamed Ahmed AbouKhousa, Sergiy Kharkivskiy
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Publication number: 20100148826Abstract: One of differential signals is inputted to a first input terminal. The other of the differential signals is inputted to a second input terminal. A first sample hold circuit samples the signal inputted to the first input terminal and hold it thereafter. A second sample hold circuit samples the signal inputted to the second input terminal and holds it thereafter. A comparison unit compares a signal corresponding to a difference between respective output signals from the first and the second sample hold circuits, with a predetermined threshold value. A latch circuit latches an output from the comparison unit. Sample timings of the first and the second sample hold circuits and a latch timing of the latch circuit can be adjusted independently.Type: ApplicationFiled: December 17, 2008Publication date: June 17, 2010Applicant: Advantest Corporation, a Japanese CorporationInventor: Shoji Kojima