Waveform Extraction Patents (Class 702/70)
  • Publication number: 20120010835
    Abstract: An intrusion detection system comprises an intrusion detector, preferably a microphone for picking up infrasound, and a signal processor. Signals from the detector are split into two channels of different frequency ranges and processed separately in the two channels, and signal characteristics are compared between the two channels. Conclusions are drawn regarding the original signal source, on the basis of the comparison between the two channels.
    Type: Application
    Filed: January 30, 2009
    Publication date: January 12, 2012
    Inventors: Tor Sønsterød, Jonathan James Burnard
  • Patent number: 8095328
    Abstract: This present specification provides, amongst other things, an electro-optical monitoring system for obtaining a once-per-revolution signal based on the surface reflection of a rotating device that mandates non-contacting sensor input in potentially hostile environments. The system can use optical and electronic sections to illuminate and detect surface reflections from the rotating surface using existing mounting locations on the periphery of the machine to be measured. The electronic portion is configured to determine a unique mark as the once-per-revolution marker or allow an attending operator to assign a specific marker based on the observed reflected pattern. The optical portion consists of a light source, receiver, and optics that allow for focused and directed light paths.
    Type: Grant
    Filed: April 27, 2010
    Date of Patent: January 10, 2012
    Assignee: Cognitive Vision Inc.
    Inventors: John Gordon Thomas, Peter James Neild, Raymond Joseph Schumacher
  • Patent number: 8068993
    Abstract: A system and method of diagnosing diseases from biological data is disclosed. A system for automated disease diagnostics prediction can be generated using a database of clinical test data. The diagnostics prediction can also be used to develop screening tests to screen for one or more inapparent diseases. The prediction method can be implemented with Bayesian probability estimation techniques. The system and method permit clinical test data to be analyzed and mined for improved disease diagnosis.
    Type: Grant
    Filed: June 17, 2008
    Date of Patent: November 29, 2011
    Assignee: Quest Diagnostics Investments Incorporated
    Inventors: Valeri I. Karlov, Bernard Kasten, Carlos E. Padilla, Edward T. Maggio, Frank Billingsley
  • Patent number: 8055204
    Abstract: A method for classifying a signal is disclosed. The method can be used by a station or stations within a network to classify the signal as non-cooperative (NC) or a target signal. The method performs classification over channels within a frequency spectrum. The percentage of power above a first threshold is computed for a channel. Based on the percentage, a signal is classified as a narrowband signal. If the percentage indicates the absence of a narrowband signal, then a lower second threshold is applied to confirm the absence according to the percentage of power above the second threshold. The signal is classified as a narrowband signal or pre-classified as a wideband signal based on the percentage. Pre-classified wideband signals are classified as a wideband NC signal or target signal using spectrum masks.
    Type: Grant
    Filed: August 15, 2007
    Date of Patent: November 8, 2011
    Assignee: Shared Spectrum Company
    Inventors: Eugene Livsics, Mark A. McHenry, Dmitry Dain, Karl Steadman, Olga Ritterbush
  • Patent number: 8055077
    Abstract: A realtime display compression for a waveform image uses a priority basis for combining groups of pixels when producing a compressed waveform image in order to preserve intensity information. As an example successive lines of data for the waveform image are demultiplexed into line buffers in a circulating manner, the number of line buffers being a function of the maximum desired integer compression ratio. The outputs from the line buffers are aligned and the corresponding pixels are combined according to a desired compression ratio, one output line for each integer compression ratio. The appropriate compressed line is selected as the output line according to the desired compression ratio, with the totality of the output lines forming the compressed waveform image.
    Type: Grant
    Filed: December 2, 2005
    Date of Patent: November 8, 2011
    Assignee: Tektronix, Inc.
    Inventors: Jeff W. Mucha, Robert L. Beasley
  • Patent number: 8050880
    Abstract: One or more embodiments of the present invention relates to an iterative method for generating an almost-constant, nearly constant, or substantially-constant envelope time signal with prescribed Fourier transform magnitude in the frequency domain, and a constant envelope time signal whose Fourier transform magnitude closely matches the prescribed Fourier transform magnitude in the frequency domain. Different starting points for the iterative algorithm give rise to different solutions and their accuracy can be adjusted using a monotonic error criterion presented here.
    Type: Grant
    Filed: October 28, 2008
    Date of Patent: November 1, 2011
    Assignee: C & P Technologies, Inc.
    Inventors: Unnikrishna Sreedharan Pillai, Ke Yong Li
  • Patent number: 8041538
    Abstract: A method and a device for estimating a first value of a signal formed of a series of values corresponding either to the first value or to a second value equal to the opposite of the first value, where the signal can take values other than the first and second values due to noise.
    Type: Grant
    Filed: July 5, 2006
    Date of Patent: October 18, 2011
    Assignee: STMicroelectronics S.A.
    Inventor: Jacques Meyer
  • Patent number: 8032319
    Abstract: Methods for signal processing employ instantaneous frequency analysis through quadrature genometric measurement of streaming signal data. Such methods may include the analysis of any composite analog periodic signal, including but not limited to audio, video, radio, seismic, light, radar, sonar, EKG, where signal data is streaming, stationary or non-stationary, and represents either linear or non-linear processes.
    Type: Grant
    Filed: June 30, 2008
    Date of Patent: October 4, 2011
    Assignee: Hal Enterprises, LLC
    Inventors: Carl Hal Hansen, Stephen R. Lindsey, Christopher E. Spencer, James Bryant Hansen, Richard C. Lindsey, Karl G. Merkley
  • Patent number: 8000917
    Abstract: A periodic broadband signal can be used to determine the S21 measurement for a channel by stimulating the channel across a spectrum of interest. The channel response to such broadband signal can be measured from undersampled data captured at the receiver. The Fourier transform of the broadband signal as received, divided by the Fourier transform of broadband signal as transmitted, constitutes the S21. A physically contiguous IC can integrate both a receiver circuit, at which S21 is to be measured, along with an undersampler for sampling the received broadband signal. To maximize signal to noise, a pattern for the broadband signal can be selected to maximize the minimum power across the spectrum of interest. A pattern generator for the broadband signal can be integrated on the same physically contiguous IC with a multiplexer that can select either the pattern generator, or a typical source of data, for transmission into the channel.
    Type: Grant
    Filed: March 28, 2008
    Date of Patent: August 16, 2011
    Assignee: Synopsys Inc.
    Inventor: Jeffrey Lee Sonntag
  • Publication number: 20110184650
    Abstract: An analog waveform signal detection/data acquisition system that is based on negative group delay for reducing inherent delay in analog waveform or signal detection and acquisition and facilitating earlier than otherwise possible responsive actions to analog waveform data. Signal advance amplification and data conditioning reduces distortion and permits greater temporal advance than previously possible.
    Type: Application
    Filed: March 9, 2008
    Publication date: July 28, 2011
    Inventor: Chris M. Hymel
  • Patent number: 7973584
    Abstract: Timing setting data include an arbitrary combination of a set timing signal indicating a positive edge timing and a reset timing signal indicating a negative edge timing. A sort unit sorts n pieces of the timing setting data in accordance with timing orders indicated by each of the timing setting data. With reference to the sorted timing setting data an open processor detects continuation of the set timing signals or continuation of the reset timing signals, and invalidates one of the continuous set timing signals or one of the continuous reset timing signals. An edge assigning unit sequentially assigns the set/reset timing signals remaining without being invalidated to, among the m variable delay circuits for setting/resetting, the variable delay circuits for setting/resetting in the ascending order of the frequencies of use thereof by then.
    Type: Grant
    Filed: September 4, 2008
    Date of Patent: July 5, 2011
    Assignee: Advantest Corporation
    Inventors: Nobuei Washizu, Hiroaki Tateno
  • Patent number: 7970564
    Abstract: This disclosure describes signal processing techniques that can improve the performance of blind source separation (BSS) techniques. In particular, the described techniques propose pre-processing steps that can help to de-correlate the different signals from one another prior to execution of the BSS techniques. In addition, the described techniques also propose optional post-processing steps that can further de-correlate the different signals following execution of the BSS techniques. The techniques may be particularly useful for improving BSS performance with highly correlated audio signals, e.g., from two microphones that are in close spatial proximity to one another.
    Type: Grant
    Filed: October 20, 2006
    Date of Patent: June 28, 2011
    Assignee: QUALCOMM Incorporated
    Inventors: Song Wang, Eddie L. T. Choy, Samir Kumar Gupta
  • Publication number: 20110152703
    Abstract: A system includes at least one first magnetic field sensor configured to measure first and second magnetic fields. The system also includes at least one second magnetic field sensor configured to measure the second magnetic field substantially without measuring the first magnetic field. The system further includes processing circuitry configured to perform signal cancellation to generate measurements of the first magnetic field and to generate an output based on the measurements of the first magnetic field. The sensors could represent magneto-electric sensors. The magneto-electric sensors could be configured to up-convert electrical signals associated with the first and/or second magnetic fields to a higher frequency. The processing circuitry could be configured to identify one or more problems associated with a patient's heart.
    Type: Application
    Filed: November 9, 2010
    Publication date: June 23, 2011
    Applicant: NATIONAL SEMICONDUCTOR CORPORATION
    Inventors: Lawrence H. Zuckerman, Michael X. Maida, Dennis M. Monticelli, James B. Wieser, Jamal Ramdani, Paul Mawson, Moulay Mohamed Ibourk
  • Patent number: 7966156
    Abstract: A method and system for intrinsic timescale decomposition, filtering, and automated analysis of signals of arbitrary origin or timescale including receiving an input signal, determining a baseline segment and a monotonic residual segment with strictly negative minimum and strictly positive maximum between two successive extrema of the input signal, and producing a baseline output signal and a residual output signal. The method and system also includes determining at least one instantaneous frequency estimate from a proper rotation signal, determining a zero-crossing and a local extremum of the proper rotation signal, and applying interpolation thereto to determine an instantaneous frequency estimate thereof.
    Type: Grant
    Filed: July 9, 2008
    Date of Patent: June 21, 2011
    Assignee: Flint Hills Scientific LLC
    Inventors: Mark G. Frei, Ivan Osorio
  • Publication number: 20110144787
    Abstract: A method to determine a distribution profile of an element in a film. The method comprises exciting an electron energy of an element deposited in a first film, obtaining a first spectrum associating with the electron energy, and removing a background spectrum from the first spectrum. Removing the background value generates a processed spectrum. The method further includes matching the processed spectrum to a simulated spectrum with a known simulated distribution profile for the element in a film comparable to the first film. A distribution profile is obtained for the element in the first film based on the matching of the processed spectrum to a simulated spectrum selected from the set of simulated spectra.
    Type: Application
    Filed: February 4, 2011
    Publication date: June 16, 2011
    Inventors: Paola deCecco, Bruno Schueler, David Reed, Michael Kwan, David Stephen Ballance
  • Publication number: 20110112779
    Abstract: A method for waveform analysis and compression includes determining harmonic components of a waveform, subtracting the harmonic components from the waveform, leaving a residual waveform, and compressing the residual waveform. Information about the harmonic components and the compressed residual transform can be transmitted across a network for analysis or reconstruction of the waveform in another device. The method is used in a low cost power quality meter, which can form part of a smart metering scheme.
    Type: Application
    Filed: November 5, 2010
    Publication date: May 12, 2011
    Applicant: CITY UNIVERSITY OF HONG KONG
    Inventors: Chung-Fai Tse, Wing-Hong Lau
  • Publication number: 20110112784
    Abstract: The present invention constitutes a method, processes, and apparatus for measurement and analysis of variables of different type and origin. In particular, the invention presents a method and apparatus for real-time signal conditioning and analysis in the presense of impulsive, or sparse interferences. The present invention overcomes limitations of the prior art by providing a novel method for identifying and discriminating between, in real time, the conditions of the signal with and without impulsive disturbances. This method can be implemented without substantial changes in the signal processing chain of a communication or data acquisition system. The present invention also overcomes the shortcomings of the prior art through the introduction of the novel SPART filters, which can replace the corresponding analog linear filters in the signal chain of a device.
    Type: Application
    Filed: November 8, 2010
    Publication date: May 12, 2011
    Inventor: Alexei V. Nikitin
  • Patent number: 7885421
    Abstract: An approach is provided for measuring, identifying, and removing at least one sinusoidal interference signal (Ak·ej(?kt+?k), Ak·ej(?·?k?t+?k)) in a noise signal (w(t), w(?·?t)). A frequency range to be measured is split into a plurality of frequency bands (?) via a Fast Fourier Transform (FFT) filter bank. For each of the frequency bands (?), an autocorrelation matrix ({circumflex over (R)}?) is determined, wherein parameters of the autocorrelation matrices ({circumflex over (R)}?) are variably adjusted based on whether the at least one sinusoidal interference signal (Ak·ej(?kt+?k), Ak·ej(?·?k?t+?k)) is to be measured, identified, or removed and further based on at least one averaging. The autocorrelation matrices ({circumflex over (R)}?) are jointly utilized for one or more of measuring, identifying, or removing the at least one sinusoidal interference signal (Ak·ej(?kt+?k), Ak·ej(?·?k?t+?k)) in the noise signal (w(t), w(?·?t)).
    Type: Grant
    Filed: January 17, 2006
    Date of Patent: February 8, 2011
    Assignee: Rohde & Schwarz GmbH & Co. KG
    Inventors: Gregor Feldhaus, Hagen Eckert
  • Patent number: 7860675
    Abstract: The present invention has an object of realizing a defect inspection estimated at high accuracy by preparing a reference image that reflects the change of the blur with time from a sampled image and design data. The present invention comprises a point spread function estimating section 23 for estimating a point spread function from an observation image and design information, a convolution image generating section 31 for generating a convolution image by convoluting the point spread function relative to the design information and a reference image generating section 33 for generating a reference image from the convolution image obtained by the convolution image generating section. binary image relative to “chromium on quartz glass”.
    Type: Grant
    Filed: November 4, 2005
    Date of Patent: December 28, 2010
    Assignee: NEC Corporation
    Inventor: Hiroyoshi Miyano
  • Patent number: 7856329
    Abstract: A method of processing data acquired by under-sampling a chirped, sinusoidal waveform comprises complex-heterodyning the under-sampled data with a chirped signal having characteristics similar to the sinusoidal waveform to generate a demodulated signal and analyzing the demodulated signal to determine characteristics of the sinusoidal waveform.
    Type: Grant
    Filed: April 10, 2007
    Date of Patent: December 21, 2010
    Inventors: Tim Niebauer, Aaron Schiel, Derek Van Westrum
  • Patent number: 7856330
    Abstract: A measuring apparatus measures a signal-under-test having a signal level that changes at predetermined bit time intervals. A strobe timing generator sequentially generates strobes at even time intervals. A level comparator detects a level of the signal at a timing at which each strobe is sequentially provided. A capture memory stores a signal level output from the comparator. A signal processor calculates a measurement of the signal based on a data series including data taken at even time intervals, each larger than a bit time interval of the signal.
    Type: Grant
    Filed: January 15, 2007
    Date of Patent: December 21, 2010
    Assignee: Advantest Corporation
    Inventors: Harry Hou, Takahiro Yamaguchi
  • Patent number: 7840356
    Abstract: Method for completely specifying orientation of electromagnetic receivers dropped to the ocean bottom in an electromagnetic survey. Survey data are selected, rejecting noisy data with long offsets and data where the receiver has saturated with short offsets (61). A model is developed comprising three independent receiver orientation angles completely specifying the receiver orientation in three dimensions, and an earth resistivity model including a water layer and possibly an air layer (62). Maxwell's equations, applied to the model and the selected data, are then inverted to determine the receiver orientations (63).
    Type: Grant
    Filed: June 28, 2006
    Date of Patent: November 23, 2010
    Assignee: ExxonMobil Upstream Research Co.
    Inventor: Xinyou Lu
  • Patent number: 7822579
    Abstract: A method and apparatus for measuring electrical signals measures an electromagnetic wave having an interference component at a center frequency and at multiple times to obtain data points. The positions of the data points on a complex plane are calculated. Chords of a circle on the complex plane, wherein the chords passing between pairs of the data points, and the circle fit to the data points are calculated. The chords are used to determine an approximate center of the circle wherein the position of the approximate center of the circle on the complex plane represents the electromagnetic wave with the interference component removed. An indication of the measured electromagnetic wave having the interference component removed is output from the apparatus.
    Type: Grant
    Filed: January 21, 2008
    Date of Patent: October 26, 2010
    Assignee: Agilent Technologies, Inc.
    Inventor: Akmarul Ariffin Bin Salleh
  • Publication number: 20100250168
    Abstract: A phasor measurement unit and method including a transducer for transduction measurement of an electrical characteristic of a current carrying element in electrical power generation or distribution systems, the transducer generating a transducer output signal representative of the electrical characteristic; an amplifier receiving the transducer output signal and generating an amplifier output signal; a filter receiving the amplifier output signal, low pass filtering the amplifier output signal. and generating a filter output signal; a digital to analog converter receiving the filter output signal and generating a digital output signal; and a processor receiving the digital output signal, calculating phasor data from the digital output signal and generating a data output signal, wherein the calculated phasor data is at least as accurate as phasor data from a phasor measurement unit or a frequency data recorder having a transducer for nontransduction measurement of the same electrical characteristic.
    Type: Application
    Filed: March 15, 2010
    Publication date: September 30, 2010
    Inventors: Guorui ZHANG, Yilu Liu, Yingchen Zhang
  • Patent number: 7805267
    Abstract: The present invention relates to verification of a transmission margin of various transmission lines transmitting a signal such as a high-speed digital signal and ensures improved verification accuracy. A transmission margin verification apparatus according to the present invention is configured with a measurement unit (e.g., LSI tester 4, network analyzer 6, pulse generator 8, oscilloscope 10) operable to measure a transmission loss and a leading edge waveform of pseudo transmission lines (e.g., transmission lines 56, 62, 66) corresponding to a target device 44 to be verified, and a calculation unit (tester controller 12) operable to reference the transmission line loss and the leading edge waveform measured by the measurement unit, calculate a transmission waveform of the target device, and associate the transmission waveform with a mask of the target device to calculate a transmission margin of the target device.
    Type: Grant
    Filed: December 8, 2004
    Date of Patent: September 28, 2010
    Assignee: Fujitsu Limited
    Inventor: Daita Tsubamoto
  • Patent number: 7797116
    Abstract: A system and method to detect acoustic signals from fire sprinkler heads discharging water and to locate such devices in a public building, airport, sports stadium or other structure which can include a system to measure speech intelligibility. Time and frequency domain analysis are carried out to establish the presence of signals characteristic of water discharge from a fire sprinkler.
    Type: Grant
    Filed: October 12, 2006
    Date of Patent: September 14, 2010
    Assignee: Honeywell International Inc.
    Inventors: Andrew G. Berezowski, Walter Heimerdinger, Charles R. Obranovich, John A. Phelps, Michael D. Shields, Philip J. Zumsteg
  • Publication number: 20100228508
    Abstract: A test and measurement apparatus, system, and method for synchronizing an acquisition or triggering system to a specific burst of interest. The subject apparatus and method triggers on varying energy content of a signal qualified by time in the presence of high-frequency input signal bursts, by using an adjustable pulse width envelope detector, disposed in the signal path of the trigger circuitry, as a digital rectifier or to otherwise process and extract an envelope signal. An RF envelope probe having an analog envelope detector among other suitable components is disclosed. A method is implemented for isolating an interval of interest in a signal under test. An envelope detector circuit produces an envelope signal from the signal. Trigger circuitry receives the envelope signal from the envelope detector, and isolates the interval of interesting in the signal under test using the envelope signal.
    Type: Application
    Filed: March 5, 2010
    Publication date: September 9, 2010
    Applicant: TEKTRONIX, INC.
    Inventors: Patrick A. SMITH, David L. KELLY, Que Thuy TRAN, Shane A. HAZZARD
  • Patent number: 7783335
    Abstract: The invention concerns a device for monitoring an imaging or radiotherapy unit (1) for treating members of the human body subject to displacements related to movements of the diaphragm. The invention is characterized in that said monitoring device is designed to enable, in a prior preparation phase, to store two values, called rest value and triggering value, respectively representing, for each patient, of his suspended ventilatory level and an inhalation or exhalation ventilatory level, triggering acquisition of images or irradiation, then, during the real monitoring of the unit (1), in commanding an image or irradiation acquisition, once the correspondence between the measured value of the suspended ventilatory level and the stored rest value has been established, and only when the correspondence between the measured respiratory value of the patient and the stored triggering value has been subsequently established.
    Type: Grant
    Filed: April 22, 2002
    Date of Patent: August 24, 2010
    Assignee: DYN'R
    Inventor: Patrick Le Corre
  • Publication number: 20100211343
    Abstract: This present specification provides, amongst other things, an electro-optical monitoring system for obtaining a once-per-revolution signal based on the surface reflection of a rotating device that mandates non-contacting sensor input in potentially hostile environments. The system can use optical and electronic sections to illuminate and detect surface reflections from the rotating surface using existing mounting locations on the periphery of the machine to be measured. The electronic portion is configured to determine a unique mark as the once-per-revolution marker or allow an attending operator to assign a specific marker based on the observed reflected pattern. The optical portion consists of a light source, receiver, and optics will allow for focused and directed light paths to properly position relevant to key reflective surfaces.
    Type: Application
    Filed: April 27, 2010
    Publication date: August 19, 2010
    Applicant: Cognitive Vision Inc.
    Inventors: John Gordon Thomas, Peter James Neild, Raymond Joseph Schumacher
  • Publication number: 20100204992
    Abstract: An process for recognizing an acoustic event in an audio signal has two stages The first stage involves possible candidates being selected, and the second stage involves each of the possible candidates being allocated a confidence value.
    Type: Application
    Filed: August 25, 2008
    Publication date: August 12, 2010
    Inventor: Markus Schlosser
  • Patent number: 7751996
    Abstract: A D/U ratio is measured for desired and undesired signals in a wireless video transmission system at a shared channel frequency based on a received signal at a geographic location in proximity to regions within respective service areas for the desired and undesired signals. A video tuner demodulates the received signal to generate a baseband video signal. A leveling circuit normalizes the baseband signal. A video processor identifies horizontal sync pulses within the baseband signal, generates a sampled signal comprising the horizontal sync pulses, and removes components of the desired signal from the sampled signal to generate an undesired signal component. A D/U analyzer determines a Fourier transform having a plurality of bins in response to the undesired signal component, identifies at least one of the bins having a spectral peak corresponding to an undesired signal, and calculates the D/U ratio in response to a magnitude of the identified peak.
    Type: Grant
    Filed: December 12, 2006
    Date of Patent: July 6, 2010
    Assignee: Sprint Communications Company L.P.
    Inventors: Giuseppe Ardizzone, Robert C. Tenten
  • Patent number: 7734435
    Abstract: This present specification provides, amongst other things, an electro-optical monitoring system for obtaining a once-per revolution signal based on the surface reflection of a rotating device that mandates non-contacting sensor input in potentially hostile environments. The system can use optical and electronic sections to illuminate and detect surface reflections from the rotating surface using existing mounting locations on the periphery of the machine to be measured. The electronic portion is configured to determine a unique mark as the once-per-revolution marker or allow an attending operator to assign a specific marker based on the observed reflected pattern. The optical portion consists of a light source, receiver, and optics that allow for focused and directed light paths.
    Type: Grant
    Filed: August 15, 2007
    Date of Patent: June 8, 2010
    Assignee: Cognitive Vision Inc.
    Inventors: John Gordon Thomas, Peter James Neild, Raymond Joseph Schumacher
  • Patent number: 7725276
    Abstract: A signal waveform analyzing device includes an extracting unit that extracts, from waveform information indicating temporal variation in signal level of a component of an electronic circuit, a signal level that satisfies a condition for a phenomenon to be observed, and outputs extracted signal level as an extraction result.
    Type: Grant
    Filed: June 1, 2007
    Date of Patent: May 25, 2010
    Assignee: Mitsubishi Electric Corporation
    Inventor: Tatsuya Kimishima
  • Patent number: 7720648
    Abstract: A method for adapting threshold values in an electronic signal processing device, involving a plurality of different threshold values being calculated and being compared with processing variables calculated in the signal processing device, involves calculation of a common correction value which is valid for the various threshold values. The threshold values are then set on the basis of the common correction value.
    Type: Grant
    Filed: October 22, 2004
    Date of Patent: May 18, 2010
    Assignee: Infineon Technologies AG
    Inventors: Steffen Paul, Thomas Ruprich
  • Patent number: 7706992
    Abstract: The present invention provides a system and method for representing quasi-periodic (“qp”) waveforms comprising, representing a plurality of limited decompositions of the qp waveform, wherein each decomposition includes a first and second amplitude value and at least one time value. In some embodiments, each of the decompositions is phase adjusted such that the arithmetic sum of the plurality of limited decompositions reconstructs the qp waveform. These decompositions are stored into a data structure having a plurality of attributes. Optionally, these attributes are used to reconstruct the qp waveform, or patterns or features of the qp wave can be determined by using various pattern-recognition techniques. Some embodiments provide a system that uses software, embedded hardware or firmware to carry out the above-described method. Some embodiments use a computer-readable medium to store the data structure and/or instructions to execute the method.
    Type: Grant
    Filed: February 23, 2006
    Date of Patent: April 27, 2010
    Assignee: Digital Intelligence, L.L.C.
    Inventors: Carlos A. Ricci, Vladimir V. Kovtun
  • Publication number: 20100088048
    Abstract: A method to predict a state of a power system and a device to perform the method are presented, where the method includes the step of performing a Fast Fourier Transform on samples of a periodic waveform signal in order to determine a frequency spectrum of the signal, where the signal was derived from at least one measurable electric quantity of the power system and is representative for the state of the power system. Frequencies and related complex amplitudes at selected peaks in the frequency spectrum are determined and stored together with a time stamp. Afterwards, a predicted value of the periodic waveform signal in the time domain is determined at a prediction time by calculating a sum of sinusoidal signals at the prediction time, where each of the sinusoidal signals is characterized by one of the determined frequencies and its related complex amplitude as well as the time stamp.
    Type: Application
    Filed: December 8, 2009
    Publication date: April 8, 2010
    Inventors: Bertil Berggren, Tord Bengtsson, Stefan Roxenborg
  • Patent number: 7676027
    Abstract: Systems and methods provide for embedding white noise signals representing DTMF digits into a voice data stream.
    Type: Grant
    Filed: June 30, 2005
    Date of Patent: March 9, 2010
    Assignee: Intel Corporation
    Inventors: Pierre Laurent, Mehdi Hassane
  • Publication number: 20100010761
    Abstract: The present invention relates to a method and a device for monitoring a system such as a cable. Pulses propagating in different directions are distinguished by measuring and sampling current and voltage at a location of the system, frequency transforming the obtained signals, and by extracting signals corresponding to pulses propagating in different directions as linear combinations of the frequency-transformed signals. Such a method is applicable, e.g. when monitoring occurrences of partial discharge on a 10 kV cable.
    Type: Application
    Filed: September 26, 2007
    Publication date: January 14, 2010
    Applicant: WAVETECH SWEDEN AB
    Inventors: Sven Nordebo, Thomas Biro, Jonas Lundbäck
  • Publication number: 20090306919
    Abstract: Provided is a sampling apparatus that samples a signal under measurement, including a sampling section that samples the signal under measurement with a plurality of sampling phases at non-uniform intervals for each sampling repetition cycle; and an inverting section that cancels out a replica that is not an observation target, from among the replicas in a sampling band of the signal under measurement and the replicas in the sampling band of a frequency component of the signal under measurement, by inverting signs of values of the signal under measurement sampled with at least one sampling phase from among the plurality of sampling phases.
    Type: Application
    Filed: June 10, 2008
    Publication date: December 10, 2009
    Applicant: ADVANTEST CORPORATION
    Inventors: Takayuki Akita, Eiji Kanoh, Masayuki Kawabata
  • Patent number: 7581143
    Abstract: A peripheral component interconnect (PCI) bus test system and method therefor, that is applied in a PCI test card. The PCI test card includes a static random-access-memory (SRAM). In the method, the data transaction of the PCI bus signal is disintegrated into a separate data operation, while eliminating the waveform interfering transaction. Through comparing the waveform of the data operation as separated from a PCI bus signal with the standard PCI bus waveform, the quality of the PCI bus signals can be precisely analyzed, thus realizing the hardware test of PCI bus.
    Type: Grant
    Filed: February 21, 2007
    Date of Patent: August 25, 2009
    Assignee: Inventec Corporation
    Inventors: Tao Liu, Qi Zhao, Tom Chen, Win-Harn Liu
  • Patent number: 7577551
    Abstract: A method for coding an event history is disclosed. Information relating to a real time state of an event is received. For a defined interval of time, it is determined whether the state of the event is in one of two states. In response to the event being in a first state, a data stream is appended with a first characteristic representative of the first state, and in response to the event being in a second different state, the data stream is appended with a second characteristic representative of the second state. The appended data stream is saved, and the process repeated for the next sequential defined interval of time.
    Type: Grant
    Filed: June 7, 2006
    Date of Patent: August 18, 2009
    Assignee: GM Global Technology Operations, Inc.
    Inventor: Fangming Gu
  • Patent number: 7574253
    Abstract: A method for processing signals, such as a tomography signal, in the time domain provides both high spatial resolution and high frequency resolution but at low cost. The method uses non-linear regression with a sinusoidal model to fit a sine wave to a portion of the signal that is less than a full cycle of a wave of the signal.
    Type: Grant
    Filed: September 26, 2003
    Date of Patent: August 11, 2009
    Assignee: Northwestern University
    Inventors: Paul A. Edney, Joseph T. Walsh, Jr.
  • Publication number: 20090187362
    Abstract: A method and apparatus for measuring electrical signals measures an electromagnetic wave having an interference component at a center frequency and at multiple times to obtain data points. The positions of the data points on a complex plane are calculated. Chords of a circle on the complex plane, wherein the chords passing between pairs of the data points, and the circle fit to the data points are calculated. The chords are used to determine an approximate center of the circle wherein the position of the approximate center of the circle on the complex plane represents the electromagnetic wave with the interference component removed. An indication of the measured electromagnetic wave having the interference component removed is output from the apparatus.
    Type: Application
    Filed: January 21, 2008
    Publication date: July 23, 2009
    Applicant: AGILENT TECHNOLOGIES, INC.
    Inventor: Akmarul Ariffin Bin Salleh
  • Patent number: 7532956
    Abstract: A power distribution and protection system and method where an electrical power source distributes power to different load circuits and provides protection that changes on the fly as required by sensing the characteristics of the loads. This is accomplished by a central processing node that is connected to multiple point of use nodes. The characteristics over an initial period of time of the current drawn by the loads are detected and compared to references that determine whether a load is inductive, resistive or is in arcing condition. One of the techniques used involves counting the zero crossings over a predetermined period of time. If the voltage applied to the loads is AC, a high pass filter is used to extract the ringing characteristics to be compared.
    Type: Grant
    Filed: August 24, 2004
    Date of Patent: May 12, 2009
    Inventors: Pedro Pelaez, Jr., Mel Sequeira, Mark Gropper
  • Publication number: 20090063072
    Abstract: A logic analyzer having clock channels and data channels includes digitizer followed by a digital filter in each channel, the digital filter compensating for losses in signal fidelity in a signal under test. The resulting enhanced multi-bit samples are stored in respective waveform memories for subsequent display as analog waveforms and as logic data. The multi-bit samples from each channel are re-sampled by a regenerated sample clock to determine the logic values of the signal at precise times. For high speed serial data, each channel is divided into multiple clock channels and sampling channels, the outputs from the clock channels being phase adjusted to provide a precise sample clock to the sampling channels and the outputs from the sampling channels being combined to form a serial data output.
    Type: Application
    Filed: September 5, 2007
    Publication date: March 5, 2009
    Applicant: TEKTRONIX, INC.
    Inventors: Steven K. SULLIVAN, Michael S. HAGEN
  • Patent number: 7496453
    Abstract: An efficient, effective and reliable method for authentication of herbal medicines (HMs) based on a novel wavelet-enhanced automated three-dimensional chromatograms classification system. The method takes advantage of the character of 3D chromatograms which appear as functional curves and the preprocessing power of wavelet transform (WT) to minimize the interferences from noises and baseline drifting of the raw data, and at the same time significantly reduces the data sizes. This compressed data retain the essential features of the original raw data, whereby leading to efficient and reliable method for identifying or authenticating herbal medicines or other chemical mixtures of great complexity.
    Type: Grant
    Filed: November 7, 2006
    Date of Patent: February 24, 2009
    Assignee: The Hong Kong Polytechnic University
    Inventor: Foo-Tim Chau
  • Publication number: 20090030628
    Abstract: A method of processing a signal comprises receiving a signal, filtering the signal with a plurality of band pass filters, each band pass filter having a Q factor of at least 1/v2, and extracting data from the output of the filters. The primary data extraction comprises identifying local peaks in the output of the filters, each local peak being a local peak in both the time and frequency directions. The method advantageously further comprises executing a curve fitting procedure, the output of which procedure comprises curve data defining a curve that at least approximates to a portion of the extracted data. The method can further comprise varying the Q factor of at least one band pass filter as the signal is filtered.
    Type: Application
    Filed: January 26, 2007
    Publication date: January 29, 2009
    Applicant: GAD Group Limited
    Inventor: Martin Paul Simpson
  • Patent number: 7460967
    Abstract: Events discovered by an automatic measurement subsystem in the trace of a DSO are visited using a set of event navigation controls. In a TIME Mode the controls operate to display the first of those events, display the next event after the one currently displayed, display the previous event before the one currently displayed, and, display the last event. In a SEVERITY Mode the controls operate to display the best of those events, display the next best event relative to the one currently displayed, display the next worst event before the one currently displayed, and, display the worst event. The sets of navigation controls may be a mode control menu accompanied by four stylized arrow shaped buttons within a GUI that are clicked on by an operator using a mouse. One set of arrow shaped button can serve both modes, or different sets of buttons can serve each respective mode.
    Type: Grant
    Filed: June 28, 2006
    Date of Patent: December 2, 2008
    Assignee: Agilent Technologies, Inc.
    Inventor: Christopher P Duff
  • Patent number: 7451048
    Abstract: A merging unit merges partial models into an entire model, and divides a grid of a parent hierarchy into grids of a child hierarchy based on hierarchical relationship of partial models, and an object selecting unit divides a grid of an object inclusion domain that includes an object selected from the entire model by a user to create a sub grid domain, and a domain selecting unit divides a grid of a domain selected from the entire model by the user to create the sub grid domain.
    Type: Grant
    Filed: January 26, 2005
    Date of Patent: November 11, 2008
    Assignee: Fujitsu Limited
    Inventors: Kenji Nagase, Sekiji Nishino, Takashi Yamagajou, Takefumi Namiki, Tetsuyuki Kubota
  • Patent number: 7449690
    Abstract: To establish a technique that enables sorting of the elevation and azimuth angle in the direction of emitting secondary electrons and obtaining images with emphasized contrast, in order to perform the review and analysis of shallow asperities and microscopic foreign particles in a wafer inspection during the manufacture of semiconductor devices, an electromagnetic overlapping objective lens is used to achieve high resolution, an electron beam is narrowly focused using the objective lens, an electric field for accelerating secondary electrons in the vicinity of a wafer in order to suppress the dependence on secondary electron energy of the rotation of secondary electrons generated by irradiation of the electron beam, a ring-shaped detector plate is disposed between an electron source and the objective lens, and the low angle components of the elevation angle of the secondary electrons, as viewed from the place of generation, and the high angle components are separated and also the azimuth components are separa
    Type: Grant
    Filed: February 9, 2006
    Date of Patent: November 11, 2008
    Assignee: Hitachi High-Technologies Corporation
    Inventors: Hidetoshi Nishiyama, Muneyuki Fukuda, Noritsugu Takahashi, Mitsugu Sato, Atsuko Fukada, Naomasa Suzuki