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| Number | Title | Issue Date |
| 8170823 | Jitter estimation in phase-locked loops A phase-locked loop is characterized by analyzing phase noise in its output signal while known levels of input phase noise are provided. The resulting data provides intrinsic phase noise and gain of the phase-locked loop. These values provide a general relationship ... | 05/01/2012 |
| 8140283 | Independent frequency measurement and tracking Independent frequency measurement and tracking of a signal using a measurement interval where the frequency of the signal is measured and a sampling rate is calculated, and a settling interval where the frequency of the signal is not measured. The sampling rate is c... | 03/20/2012 |
| 8117000 | Measuring quantum states of superconducting resonators A method for measuring the quantum state of a resonator includes, exciting an input port of a circuit with signal, measuring a phase shift of the signal at an output port of the circuit, wherein the resonator is coupled to the input and the output ports, and calcula... | 02/14/2012 |
| 8060327 | Waveform generator, waveform generating device, test apparatus, and machine readable medium storing a program thereof There is provided a waveform generator for generating an analog signal, including a data changing section which changes an input data sequence, which is to be modulated to the signal which the waveform generator should generate, to generate an after-change data sequ... | 11/15/2011 |
| 8050879 | Phase identification system and method A method to identify phase is presented. The method includes obtaining electrical parameters at a node and a substation of an electrical grid, processing the electrical parameters of the node and the substation into processed electrical parameters comprising at leas... | 11/01/2011 |
| 8032850 | Structure for an absolute duty cycle measurement circuit A design structure for a circuit for measuring the absolute duty cycle of a signal, is provided. A non-inverted path from a signal source is selected and various DCC circuit setting indices are cycled through until a divider, coupled to the output of the DCC circuit... | 10/04/2011 |
| 7945406 | Measuring device and method for measuring relative phase shifts of digital signals M periods of the test signal and of the reference signal are received. The periods of the test signal and of the reference signal are in each case Tsig long. The test signal is sampled with N sampled values at a sampling frequency fs=1/Ts | 05/17/2011 |
| 7890279 | Jitter estimation in phase-locked loops A phase-locked loop is characterized by analyzing phase noise in its output signal while known levels of input phase noise are provided. The resulting data provides intrinsic phase noise and gain of the phase-locked loop. These values provide a general relationship ... | 02/15/2011 |
| 7885776 | Waveform generator, waveform generating device, test apparatus, and machine readable medium storing a program thereof There is provided a waveform generator for generating an analog signal, including a data changing section which changes an input data sequence, which is a sequence of binary data and which is to be modulated to the signal which the waveform generator should generate... | 02/08/2011 |
| 7809517 | Apparatus and method for measuring phase noise/jitter in devices under test A system for testing integrated circuit products and other devices under test (DUT) includes a DUT tester, which stimulates the devices under test and analyzes signals from the devices under test. A device interface board transports signals between the DUT tester an... | 10/05/2010 |
| 7751997 | Highly fault-tolerant method for evaluating phase signals The invention relates to a method for unambiguously determining a physical parameter Φ using m phase-measured values αi with 1≦i≦m, whereby the phase-measured values αi have different, integer periodicity values ni and an inte... | 07/06/2010 |
| 7739063 | Nonlinear measurement system error correction A method for eliminating the systematic measurement errors from a measurement system, for example a vector network analyzer, such that an accurate representation of the behavior of a nonlinear device can be measured or characterized. The cross-frequency phase and ab... | 06/15/2010 |
| 7720623 | Fixed reference frame phase-locked loop (FRF-PLL) for unbalanced line voltage conditions The present invention relates to a system to implement a phase-locked loop (PLL) which is able to provide an estimation of the angular frequency, and both the positive and negative sequences of the fundamental component of a three-phase signal. These sequences are p... | 05/18/2010 |
| 7428464 | Wideband signal analyzer A wideband signal analyzer has a plurality of frequency conversion paths for simultaneously processing different contiguous frequency bands of an input signal. Each frequency conversion path provides time domain data for input to a digital signal processor. The digi... | 09/23/2008 |
| 7426444 | Methods for determining relative phase differences in entangled quantum states Various embodiments of the present invention are directed to methods for determining a phase shift acquired by an entangled N-qubit system represented by a NOON state. In one embodiment, a probe electromagnetic field is coupled with each qubit system. The phase shif... | 09/16/2008 |
| 7415372 | Method and apparatus for improving noise discrimination in multiple sensor pairs Noise discrimination in signals from a plurality of sensors is conducted by enhancing the phase difference in the signals such that off-axis pick-up is suppressed while on-axis pick-up is enhanced. Alternatively, attenuation/expansion are applied to the signals in a... | 08/19/2008 |
| 7401008 | Method, computer program, and system for intrinsic timescale decomposition, filtering, and automated analysis of signals of arbitrary origin or timescale 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 minim... | 07/15/2008 |
| 7398411 | Self-calibrating time code generator Provided is a self-calibrating time code generator and method for generating an accurate time code (e.g., an accurate IRIG waveform). The self-calibrating time code generator includes a phase-locked loop configured to provide a generated output signal based on a pha... | 07/08/2008 |
| 7379791 | Integrated metrology systems and information and control apparatus for interaction with integrated metrology systems A system is disposed at a location of a utility commodity subscriber for informing the subscriber of and controlling utility commodity usage. The system includes utility meters, an information and control apparatus, and a first and second data communication link. Th... | 05/27/2008 |
| 7376525 | Apparatus and method for estimation of initial phase of a brushless motor An apparatus comprises a brushless motor, driver, incremental displacement sensor, and processor. The motor has a rotor, stator, and electrical terminals accepting a drive signal. The initial phase of the rotor is unknown. The driver is connected to the electrical t... | 05/20/2008 |
| 7372246 | Phase identification system and method A system and method for determining the relative phase between current-carrying conductors. A reference unit samples and digitizes a voltage waveform at a reference location and transmits the digitized voltage waveform. A field sampling unit is placed on or directly... | 05/13/2008 |
| 7346464 | Gait waveform feature extracting method and individual identification system A gait waveform feature extracting method and an individual identification system extract features of the gait waveform. A one-step waveform corresponding to one step of a walking movement is specified using, as an index, a peak amplitude corresponding to a state wh... | 03/18/2008 |
| 7339509 | Sampling system using sampling apertures of different durations A signal sampling system includes an input signal and a plurality of samplers. The plurality of samplers produces a plurality of sample output signals. Each sampler from the plurality of samplers samples the input signal to produce a corresponding sample output sign... | 03/04/2008 |
| 7337083 | Process for identification of the direction of rotation of two periodic electrical signals at the same frequency A process and apparatus for identification of the direction of rotation of two periodic electrical signals present on two electrical conductors, particularly of a three-phase power system. In this process, the signals are sampled from two conductors by two wires of ... | 02/26/2008 |
| 7330437 | Checking connectivity for point-to-multipoint connections A method and system thereof for checking connectivity between endpoints in a network are described. A message is sent from an originating endpoint to a terminating endpoint. The message directs the terminating endpoint to enable detection of continuity check cells u... | 02/12/2008 |
| 7315797 | Method and system for eliminating VSWR errors in phase and amplitude measurements A method and system for canceling VSWR effects is provided. The exemplary method includes taking multiple measurements of parameters of a signal with a phase of the microwave signal shifted for each measurement; and processing the measured parameters to eliminate VS... | 01/01/2008 |
| 7308372 | Phase jitter measurement circuit A method, an apparatus, and a system for phase jitter measurement circuits are described herein. ... | 12/11/2007 |
| 7289920 | Method and apparatus for capture of grid characteristics corresponding to fluctuation events The techniques described herein allow a wind turbine generator system to automatically capture voltage waveform data corresponding to a voltage disturbance event. Data corresponding to a period preceding the voltage disturbance event, during the event and a period o... | 10/30/2007 |
| 7272521 | Measurement of phase nonlinearity of non-linear devices A method for determining the phase characteristics of a nonlinear analog device includes application of a test signal, which may be linear-FM, to the nonlinear device. The converted signal is digitized and mathematically converted to baseband in ideal fashion. A dig... | 09/18/2007 |
| 7271572 | Apparatus and methods for providing a voltage adjustment for single-phase voltage regulator operation in a three-phase power system Provided is an apparatus and method for providing a voltage reduction for single-phase voltage regulator operation in a three-phase power system. The voltage regulator includes a plurality of tap positions selectable to adjust a voltage at a load to an in-band area.... | 09/18/2007 |
| 7268783 | Image alias rejection using shaped statistical filtering Image alias rejection when converting a high resolution rasterized waveform to a lower resolution rasterized waveform for display uses a statistical filter. The statistical filter provides a shaped probability density function either by combining the outputs of mult... | 09/11/2007 |
| 7263452 | Resolver-to-digital converting apparatus, method and program A resolver-to-digital converting apparatus calculates a resolver rotational angle from two-phase sampling values that are the result of sampling two-phase output signals, which are obtained from a single-phase-excited, two-phase output resolver, at peak timings of a... | 08/28/2007 |
| 7260485 | Method and systems for distinguishing between materials having similar spectra Various computer-implemented methods and systems are provided. One computer-implemented method includes determining a ratio between output signals generated by detecting spectra for a single event in two or more detection windows. The spectra are characteristic of d... | 08/21/2007 |
| 7257504 | Production of radio frequency ID tags A radio frequency ID tag, very small in size and with an onboard antenna, is manufactured, tested and applied cost-efficiently. The transmit frequency for the tag is set during manufacture approximately, within a selected range, in a gross tuning step. A second tuni... | 08/14/2007 |
| 7254507 | Analog circuit automatic calibration system An analog circuit automatic calibration system for calibrating an object circuit that is an analog circuit having a characteristic changing with an input set value. The system includes: a set value storage section for storing a value and outputting the value to the ... | 08/07/2007 |
| 7248664 | Timesliced discrete-time phase locked loop A time-sliced discrete-time Phase Locked Loop which is suitable for simultaneously synchronizing multiple input signals to multiple output signals is provided by implementing a discrete-time phase detector, loop filter, and voltage controlled oscillator that togethe... | 07/24/2007 |
| 7246018 | Interpolator testing circuit An interpolator testing system and method comprises an interpolator that includes a phase shift module. The phase shift module receives a reference clock signal and generates M clock signals having phase shifts in increments of 360/M degrees relative to the referenc... | 07/17/2007 |
| 7239675 | GFSK receiver A method for synchronizing a receiver to a stream of transmitted symbols that includes a known synchronization word. The method includes receiving a signal in which the symbols, including the synchronization word, are encoded by frequency shift keying. The signal is... | 07/03/2007 |
| 7233869 | Phase comparing method and apparatus in which a sampled periodic signal has a predetermined resolution A phase difference between a first periodic signal, and a sample signal corresponding to a second periodic signal and having a predetermined signal resolution M is calculated in a phase comparing method. The sample signal is obtained by sampling the second periodic ... | 06/19/2007 |
| 7233886 | Adaptive modeling of changed states in predictive condition monitoring An improved empirical model-based surveillance or control system for monitoring or controlling a process or machine provides adaptation of the empirical model in response to new operational states that are deemed normal or non-exceptional for the process or machine.... | 06/19/2007 |
