# Frequency

## Subclass of:

## 702 - Data processing: measuring, calibrating, or testing

## 702001000 - MEASUREMENT SYSTEM IN A SPECIFIC ENVIRONMENT

## 702057000 - Electrical signal parameter measurement system

## 702066000 - Waveform analysis

### Patent class list (only not empty are listed)

#### Deeper subclasses:

Class / Patent application number | Description | Number of patent applications / Date published |
---|---|---|

702076000 | Frequency spectrum | 75 |

702078000 | By count (e.g., pulse) | 7 |

Entries | ||

Document | Title | Date |
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20110015886 | SENSOR INTERFACE SYSTEM - A sensor interface system interfaces a collection of one or more sensors that can sense chemical, biological, radiation, nuclear, and explosives (CBRNE) materials. The system includes one or more digital and/or analog sensor interfaces for communicating with one or more sensors including: chemical sensors, biological sensors, radiation sensors, nuclear sensors, and explosives sensors. A processor is configured to receive and process signals from the one or more digital and/or analog sensor interfaces, and when the one or more sensors include a radiation sensor and/or nuclear sensor, the processor differentiates between gamma pulses and neutron pulses, by: receiving a signal from an output of a neutron detector; analyzing a pulse shape of the signal; differentiating the pulse shape between gamma pulses and neutron pulses; and determining that the pulse shape of the signal is one of a gamma pulse and a neutron pulse. | 01-20-2011 |

20120283974 | METHOD, SYSTEM AND APPARATUS FOR LOCATING AND DETECTING INCOHERENT RADIO NOISE TYPICAL OF ILLEGAL PLANT GROW OPERATIONS - A method and apparatus for detecting and locating illegal grow operations. The method involves using a radio receiver coupled to more than one antenna to detect a radio frequency signature associated with incoherent radio noise associated with grow lights typical of illegal grow operations. At least one antenna is provided which capable of detecting the presence of high energy radio emissions. At least one antenna is provided with directional sensitivity to pinpoint a source of the high energy radio emissions. | 11-08-2012 |

20120109560 | Remote Interrogation of a Passive Wireless Antenna Sensor - The condition of a structure using remote interrogation of a multi-state passive wireless antenna sensor that has a known resonant frequency when mounted on the structure. The passive wireless antenna sensor is connected to a remotely operated switching circuit that includes a photocell. An interrogation system transmits a series of radio frequency signals with sweeping frequencies around the known resonant frequency to the passive wireless antenna sensor, while simultaneously pulsing a laser to switch the passive wireless antenna sensor between a first state and a second state in which it is exposed to open-circuit or short-circuit conditions. A signal is reflected from the passive wireless antenna sensor in each of the first and second states, and a resonant frequency of the passive wireless antenna sensor is determined by normalizing the received signals to isolate the antenna mode. | 05-03-2012 |

20150323575 | ESTIMATING AN ELECTRICITY SUPPLY'S FUNDAMENTAL FREQUENCY - This disclosure relates to an apparatus, computer readable medium and a method for estimating a frequency of an electrical signal. The method comprises converting a first signal having three components into a second signal having two components in accordance with a first transformation, wherein each component of the first signal corresponds to a phase component of a three-phase electrical signal and the two components of the second signal are representative of characteristics of the three-phase electrical signal. The method further comprises filtering the second signal in accordance with a previous frequency estimation. Then the method comprises converting the filtered second signal into a third signal having a single component in accordance with a second transformation, wherein the single component of the third signal is representative of characteristics of the three-phase electrical signal. Finally, the method comprises estimating a frequency of the third signal, wherein the estimated frequency of the third signal is indicative of a frequency of the three-phase electrical signal. | 11-12-2015 |

20120084035 | SYSTEM AND METHOD FOR FREQUENCY MEASUREMENT BASED ON QUADRATIC FORMS - A system and methods for determining points for an algorithm to calculate the frequency of a waveform measured from a monitoring device. Data points are measured from the waveform. A last point of interest from the previous cycle of the waveform is referenced. Four points of interest at equally spaced phase angles from the current cycle of the waveform are determined by calculating the average of the data points around each of the respective equally spaced phase angles of the current cycle of the waveform. The average value of the points of interest in the current cycle is subtracted from the four points of interest and the last point of interest from the previous cycle to compensate for DC bias. A frequency of the waveform is determined based on the determined four points of interest of the current cycle and the last point of interest from the previous cycle. The correction factor for determining sample frequency may be reduced for subsequent cycles in order to increase stability. | 04-05-2012 |

20110022341 | MEASUREMENT APPARATUS, PROGRAM, RECORDING MEDIUM, AND MEASUREMENT METHOD - Provided is a measurement apparatus that measures a characteristic of an AD converter, comprising a signal supplying section that supplies the AD converter with an analog input signal having a prescribed waveform; an acquiring section that acquires a digital output signal output by the AD converter as a result of sampling the analog input signal; a measured histogram generating section that generates a histogram of the digital output signal; and a range calculating section that calculates at least one of an analog value corresponding to a lower limit and an analog value corresponding to an upper limit of a prescribed digital range, based on at least one of (i) a frequency corresponding to digital values, in a measured histogram obtained by measuring the digital output signal, that are less than or equal to the digital range and (ii) a frequency corresponding to digital values in the measured histogram that are greater than or equal to the digital range. | 01-27-2011 |

20110022342 | DISTRIBUTED SPECTRUM SENSING - In summary, the invention relates to a device, a system, a method and a computer program for spectrum sensing. A detection procedure for detecting a signal of interest or an event by using a plurality of sensing devices capable of communicating with a central unit is proposed. The sensing devices can compute soft detection metrics and communicate this information to a central unit, where the information may be used to make a final detection decision using a certain specified rule. The signaling overhead of the proposed approach can be of the same order as that of a hard signaling approach. However, the proposed approach may achieve a better detection performance. | 01-27-2011 |

20110004430 | EDDY CURRENT DETECTION AND COMPENSATION - A distortion compensation method includes determining an undisturbed phase for at least one of a first position indication signal and a second position indication signal. The method includes determining an undisturbed ratio that relates the amplitude of the first position indication signal at a first frequency to the amplitude of the second position indication signal at a second frequency. The method also includes determining a disturbed amplitude of the position indication signal and adjusting a position indication based on the disturbed amplitude and phase, the undisturbed amplitude ratio, and the undisturbed phase. The method further comprises determining a relationship between the eddy current phase of the first position indication signal and the second position indication signal. | 01-06-2011 |

20090259423 | POWER SUPPLY APPARATUS FOR OPERATION AND RESONANT FREQUENCY SEARCHING METHOD - A power supply apparatus for operation supplies a drive signal of a resonant frequency to a surgical instrument to drive the instrument. A recognition section recognizes a surgical instrument connected to the power supply apparatus. A setting section sets a frequency scanning condition according to the surgical instrument recognized by the recognition section. A scanning section scans for the resonant frequency of the surgical instrument on the basis of the frequency scanning condition set by the setting section. | 10-15-2009 |

20160091541 | PARAMETER DETERMINATION METHOD, COMPUTER-READABLE RECORDING MEDIUM, AND INFORMATION PROCESSING APPARATUS - A parameter determination method is disclosed. Information of specification of the output is received. A first circuit constant and a second circuit constant to set in elements forming an equivalent circuit of the predetermined circuit is received. A first range of a plurality of the parameters which are to be set in a compensator that compensates the output is specified based on the information of the specification and the first circuit constant. A second range of a plurality of parameters which are to be set in the compensator is specified based on the information of the specification and the second circuit constant. At least one of a parameter included in both the first range and the second range. | 03-31-2016 |

20100274510 | Method of Detecting System Function by Measuring Frequency Response - Methods of rapidly measuring the impedance spectrum of an energy storage device in-situ over a limited number of logarithmically distributed frequencies are described. An energy storage device is excited with a known input signal, and the response is measured to ascertain the impedance spectrum. The excitation signal is a limited time duration sum-of-sines consisting of a select number of frequencies. In one embodiment, magnitude and phase of each of frequency of interest within the sum-of-sines is identified when the selected frequencies and sample rate are logarithmic integer steps greater than two. This technique requires a measurement with a duration of one period of the lowest frequency. In another embodiment, where the selected frequencies are distributed in octave steps, the impedance spectrum can be determined using a captured time record that is reduced to a half-period of the lowest frequency. | 10-28-2010 |

20090287437 | COMPLEX PHASE LOCKED LOOP - A method of estimating an instantaneous frequency of a component of interest in a complex primary signal via a complex Phase Locked Loop (PLL). A complex incident signal including a complex exponential evaluated at a synthesis frequency is calculated according to a complex Voltage Controlled Oscillator (VCO) function. A complex mixed signal is calculated according to a function that includes multiplying the complex primary signal by a representation of the complex incident signal. A complex baseband signal is calculated according to a function that includes filtering the complex mixed signal such that the bandwidth of the complex baseband signal is less than or equal to the bandwidth of the complex mixed signal. A residual frequency of the complex baseband signal is calculated via a complex Phase Discriminator (PD). The synthesis frequency is modified according to a function that includes the synthesis frequency and the residual frequency, such that the residual frequency is minimized. The instantaneous frequency is calculated according to a function that includes a representation of the synthesis frequency and stored. | 11-19-2009 |

20120004877 | SIGNAL EVALUATING DEVICE AND SIGNAL EVALUATING METHOD - A signal evaluating device comprises: a binarizing portion for binarizing an input signal; a run length measuring portion for measuring the run length of the input signal during the evaluating interval, using the output of the binarizing means as the input; and a validity evaluating portion for evaluating whether or not the input signal is valid, from the degree of matching of a run length frequency distribution, obtained from the measurement results by the run length measuring portion, and a geometric distribution. The validity evaluating portion evaluates whether or not an input signal is valid through a ratio of the total frequency during the evaluation interval to Nsamp/2, or a ratio of the frequency of a class 1 during the evaluating interval to Nsamp/4, where Nsamp is the total of the sampling clocks for measuring the run length during the evaluating interval. | 01-05-2012 |

20100223019 | Measuring Filling Level by Means of Evaluating an Echo Curve - A method for filling level measuring comprises generating an echo curve and analysing the echo curve by means of an analysis method. The analysis method is at least one analysis method selected from the group of analysis methods comprising analysing the echo curve by means of at least two parallel tasks, and analysing the echo curve by comparing the echo curve with a spurious-echo curve at the IF-level. | 09-02-2010 |

20110130993 | DIGITAL IMPLEMENTATION OF A TRACKING FILTER - Methods and systems for tracking an electronic signal corresponding to an operating frequency of an electronic component are provided. A method may include sampling the signal to determine previous and current time samples of the signal. A frequency of interest in the signal may also be pre-warped to decrease adverse warping effects resulting from processing signals having relatively higher operating frequencies. The previous and current time samples of the signals, along with the pre-warped frequency of interest, may be input into a digital tracking filter. The digital tracking filter may be configured to execute one or more algorithms on the previous and current time samples and the pre-warped frequency of interest to estimate a current operating frequency. | 06-02-2011 |

20130338954 | ALTERNATING-CURRENT ELECTRICAL QUANTITY MEASURING APPARATUS AND ALTERNATING-CURRENT ELECTRICAL QUANTITY MEASURING METHOD - An alternating-current electrical quantity measuring apparatus calculates, as a frequency coefficient, a value obtained by normalizing, with a differential voltage instantaneous value at intermediate time, a mean value of a sum of differential voltage instantaneous values at times other than the intermediate time among differential voltage instantaneous value data at three points each representing an inter-point distance between voltage instantaneous value data at adjacent two points in voltage instantaneous value data at continuous at least four points obtained by sampling an alternating voltage set as a measurement target at a sampling frequency twice or more as high as a frequency of the alternating voltage. | 12-19-2013 |

20110191048 | Method and System for a Comprehensive Analysis of Low Frequency Oscillation - A method and a system for a comprehensive analysis of low frequency oscillation. The method includes: firstly, initiating a wide area measurement system WAMS ( | 08-04-2011 |

20130332097 | INFORMATION PROCESSING METHOD AND APPARATUS FOR DECIDING CONTROL PARAMETERS - A computer-readable-recording-medium stored a program for causing a computer to execute: judging, for each of elements of a plurality of scattering parameters, whether a difference between a first-area in a plane containing an axis representing frequency and an axis representing the element, and a second-area in the plane is within a permissible range, the first-area being surrounded by a first-element-value series of the element that is defined in advance for a plurality of first-frequencies, the second-area being surrounded by a second-element-value series that is obtained by performing interpolation calculation from the first-element-value series for a plurality of second frequencies which are different from the plurality of first-frequencies and which are provided at regular intervals; and determining, by performing the judging for one interval or a plurality of intervals, an interval so that the difference falls within the permissible range for all of the elements of the plurality of scattering parameters. | 12-12-2013 |

20140303918 | HANDLING RESONANCES IN A POWER TRANSMISSION SYSTEM - A method, resonance handling device and computer program product are disclosed for handling resonances in a power transmission system. The resonance handling device can include a resonance frequency determining unit configured to obtain measurements (y | 10-09-2014 |

20100010762 | FREQUENCY MEASUREMENT APPARATUS - The invention relates to a frequency measurement apparatus which is arranged in such a way as to obtain an amplitude, chord length and rotation phase angle of a voltage rotation vector by means of an integration method, and furthermore, obtain a change rate of the rotation phase angle, and a rotational acceleration change rate of the rotation vector, and measure a dynamic frequency by determining a frequency change rate for every step. | 01-14-2010 |

20150338493 | DIAGNOSTIC TOOL FOR EM PERTURBATIONS IN MRI SYSTEMS - A method of determining the frequency and amplitude of a perturbing cyclic EM signal in the field of view of an NMR or MRI system during acquisition of a spin-echo spectrum. The frequency ν of the perturbing electromagnetic signal is determined by acquiring a plurality of n | 11-26-2015 |

20110125438 | SIGNAL ANALYZER FOR ANALYZING DYNAMIC BEHAVIOR OF A TARGET SYSTEM - A signal analyzer includes a sampling unit, a filter unit coupled to the sampling unit, a computing unit coupled to the filter unit, and an output unit coupled to the computing unit. The sampling unit is operable to sample a time domain signal from a target system according to a predetermined sampling frequency to obtain a sampling signal. The filter unit is configured to perform filter processing upon the sampling signal so as to filter out harmonic frequency components from the sampling signal, thereby obtaining a fundamental frequency signal having a plurality of sample points. The computing unit is operable to compute a signal parameter set for each of temporally adjacent pairs of the sample points of the fundamental frequency signal. The output unit is configured to output information about dynamic behavior of the target system based upon the signal parameter sets computed by the computing unit. | 05-26-2011 |

20120253720 | METHOD TO MINIMIZE COMMON RAIL PRESSURE IRREGULARITIES DUE TO ALIASING EFFECT ON BATTERY VOLTAGE MONITORING - A method is provided to minimize common rail pressure irregularities due to aliasing effect on battery voltage monitoring in a digital electronic control unit that is capable of PWM regulations of a metering valve unit in a diesel common-rail power-train system. At least an engine rotary speed signal is detected and at least a battery voltage signal is monitored, the method includes, but is not limited to calculating the aliasing frequency on said battery voltage signal as a function of said engine rotary speed signal, filtering the battery voltage signal before it is input to said controller module with at least one digital non-linear notch filter, the at least one digital non-linear notch filter substantially centered on the first harmonic of the aliasing frequency, and input the filtered battery voltage signal, at least with the engine rotary speed signal, to the controller module for PWM regulating the metering valve unit. | 10-04-2012 |

20110231128 | TEST APPARATUS, MEASUREMENT APPARATUS, AND ELECTRONIC DEVICE - A test apparatus that judges pass/fail of a signal under measurement, comprising a frequency counter that repeatedly performs a counting step of counting the number of pulses of a reference signal whose period is known and the number of pulses of the signal under measurement in parallel within the same measurement period; an average period calculating section that calculates, for each counting step, an average period of the signal under measurement within the measurement period, based on a period of the reference signal and a ratio between the number of pulses of the signal under measurement and the number of pulses of the reference signal counted within the same measurement period; a noise calculating section that calculates spread of the average periods calculated by the average period calculating section; and a judging section that judges pass/fail of the signal under measurement based on the spread of the average periods. | 09-22-2011 |

20140052399 | FREQUENCY DETERMINATION CIRCUIT AND METHOD - Circuits and methods for identifying or verifying frequencies are disclosed herein. A frequency verification circuit comprises: an input port for receiving an input signal; a phase frequency difference detector for determining a difference in phase and frequency between the input signal and a feedback signal and for providing a control signal based on the detected difference; a voltage controlled crystal oscillator for producing an output signal based on the control signal; and a feedback loop including a feedback divider for frequency dividing the output signal by a factor R to produce the feedback signal, the feedback divider being programmable to a plurality of values of the factor R to correspond to a plurality of different test frequencies. | 02-20-2014 |

20100121596 | METHODS AND SYSTEMS FOR FREQUENCY ESTIMATION FOR ACCELEROMETERS - Methods and systems for improving frequency estimation without increasing digital counter resolution. An example system mixes and filters a known carrier signal with the signal containing the frequency of interest, in order to bring the frequency domain image closer to baseband, and then performs the frequency estimation. This allows much better resolution without the need to increase the counter frequency. | 05-13-2010 |

20130191062 | Domain Identification and Separation for Precision Measurement of Waveforms - A machine-implemented method for computerized digital signal processing obtains a digital signal from data storage or from conversion of an analog signal and determines, from the digital signal, Measuring Matrices (MM). Each measuring matrix has a plurality of cells, each cell having an amplitude corresponding to the signal energy in a frequency bin for a time slice. Cells in each measuring matrix having maximum amplitudes within a time slice are identified as maximum cells. Maxima that coincide in time and frequency are identified and a correlated maxima matrix (PMM) is constructed showing the coinciding maxima and the adjacent marked maxima are linked into partial chains. If only one MM is constructed, multiple types of maxima are identified to generate the (PMM). The partial chains are isolated by parameters for a single domain or multiple domains to identify partial chains and possible separation of complex compound waveforms in the digital signal. | 07-25-2013 |

20150355249 | FUNDAMENTAL FREQUENCY STABILITY AND HARMONIC ANALYSIS - A method, apparatus and computer readable medium for estimating a frequency of an electrical signal are disclosed. The method comprises taking a number of samples of an electrical signal throughout a main sampling window; dividing the number of samples taken throughout the main sampling window into a plurality of groups of consecutive samples, each group of consecutive samples forming a subwindow, wherein each subwindow includes a minimum number of the number of samples required to provide a required level of accuracy for estimating the fundamental frequency of the electrical signal; estimating, for each subwindow, the fundamental frequency of the electrical signal based on the group of consecutive samples of the respective subwindow; and determining if the fundamental frequency is stable throughout the main window by comparing the estimated fundamental frequency of each subwindow. | 12-10-2015 |

20100070224 | System and method for identifying appliances by electrical characteristics - Illustrative embodiments provide systems, applications, apparatuses, computer software program products, and methods related to identification of electrical appliances by electrical characteristics. | 03-18-2010 |

20090254291 | Acquiring Phasors Outside the Frequency Tracking Range for Power Protective Relays - A system and method for acquiring phasors outside of the frequency tracking range for power protective relays. As the frequency of a power system varies from the rated frequency, phasors calculated from such samples include errors. A frequency tracking range is used to sample the signal waveform at a rate corresponding to the frequency when the frequency is within the frequency tracking range. When the frequency is outside of the frequency tracking range, the signal waveform is sampled at a rate corresponding with the maximum or minimum of the frequency tracking range depending on whether the frequency exceeds or falls below the frequency tracking range. The difference between the frequency and the minimum or maximum of the frequency tracking range is used to correct the measured phasors to result in accurate phasors. | 10-08-2009 |

20130116957 | FINE FREQUENCY OFFSET ESTIMATION METHOD AND APPARATUS - The disclosure discloses a fine frequency offset estimation method and apparatus. The method comprises: calculating a first accumulated estimation value corresponding to a first multiframe state according to a phase relevant value of a subframe and a phase of a subframe in the first multiframe state; calculating a second accumulated estimation value corresponding to a second multiframe state according to the phase relevant value of the subframe and a phase of a subframe in the second multiframe state; determining that a decision result of a multiframe state is the first multiframe state or the second multiframe state according to the first accumulated estimation value and the second accumulated estimation value; and performing a fine frequency offset estimation according to the decision result of the multiframe state. The apparatus disclosed in the disclosure is less coupled with other modules, has excellent performance in various environments, and realizes the unbiased estimation of timing offset. | 05-09-2013 |

20130124125 | DIGITAL IMPLEMENTATION OF A TRACKING FILTER - Methods and systems for tracking an electronic signal corresponding to an operating frequency of an electronic component are provided. A method may include sampling the signal to determine previous and current time samples of the signal. A frequency of interest in the signal may also be pre-warped to decrease adverse warping effects resulting from processing signals having relatively higher operating frequencies. The previous and current time samples of the signals, along with the pre-warped frequency of interest, may be input into a digital tracking filter. The digital tracking filter may be configured to execute one or more algorithms on the previous and current time samples and the pre-warped frequency of interest to estimate a current operating frequency. | 05-16-2013 |

20150142358 | RAPID INTERROGATION METHOD FOR ELASTIC WAVE RESONANT DEVICES - A method for interrogating an elastic wave device includes probing the response of a piezoelectric resonant device at a single frequency alternately on either side of a previously determined first resonance frequency, to characterize this resonance frequency characteristic of the measured physical quantity, by correlating this single measurement with a previously performed measurement. | 05-21-2015 |

20120278020 | APPARATUS AND METHOD FOR REAL TIME HARMONIC SPECTRAL ANALYZER - In one embodiment, a measuring device may comprise two oscillators. The first oscillator may generate a local reference signal in a frequency detector to detect a fundamental frequency of the AC. The second oscillator may generate two substantially mutually orthogonal sinusoid signals having the selected frequency. The measuring device further may comprise a first group of multipliers that mixes the two sinusoid signals with a current and a voltage data signal of the AC respectively, a group of low-pass filters for removing high frequency components from the multiplication products, a second group of multipliers for mixing the filtered multiplication products respectively, and a plurality of adders each to sum together a pair of multiplication products of the second group of multipliers. | 11-01-2012 |

20110184681 | Authentication device for full intact wine bottles - Methods, device and systems for identifying or fingerprinting an intact bottle of wine are provided. Such methods are useful in authenticating a bottle of wine. | 07-28-2011 |

20090063073 | Method for ascertaining a mains frequency in a voltage signal, and mains analyzer - To ascertain a mains frequency from a voltage signal which has a particularly high proportion of harmonics, the discrete Fourier transform is used in at least one embodiment to calculate two phases, and the phase interval between these phases is used to infer the mains frequency. | 03-05-2009 |

20090125258 | SCANNABLE VIRTUAL RAIL RING OSCILLATOR CIRCUIT AND SYSTEM FOR MEASURING VARIATIONS IN DEVICE CHARACTERISTICS - A scannable virtual rail ring oscillator circuit and system for measuring variations in device characteristics provides the ability to study random device characteristic variation as well as systematic differences between N-channel and P-channel devices using a ring oscillator frequency measurement. The ring oscillator is operated from at least one virtual power supply rail that is connected to the actual power supply rail by a plurality of transistors controlled by a programmable source. The transistors are physically distributed along the physical distribution of the ring oscillator elements and each can be enabled in turn and the variation in ring oscillator frequency measured. The ring oscillator frequency measurements yield information about the variation between the transistors and N-channel vs. P-channel variation can be studied by employing positive and negative virtual power supply rails with corresponding P-channel and N-channel control transistors. | 05-14-2009 |

20090055112 | Sensing apparatus - An object of the present invention is to provide a sensing instrument capable to detect a substance existing in a very small quantity, such as environmental pollutants, instantly with a high degree of precision. As a specific means for solving the problem, a frequency signal from a crystal oscillator is sampled using a frequency signal from a reference clock generating part, the sampling value is outputted in a digital signal, quadrature detection is conducted with the digital signal for a frequency signal corresponding to the output signal, the rotational vector rotating at a frequency corresponding to the difference between the frequency of the frequency signal and the frequency of a sinusoidal wave used for the quadrature detection is taken out, and the variation of the frequency is detected by detecting the velocity of the rotational vector based on the respective sampling values. In addition to that, the measurement range of the variation of frequency can be widened by multiplying the above-described rotational vector by the reversely rotational vector corresponding to the velocity of the rotational vector. | 02-26-2009 |

20090076752 | FREE-STATE MODAL FREQUENCY RESPONSE TESTING - An apparatus and associated method is provided for suspending a test object in a gravitational field from a support member, exciting the test object by noncontactingly engaging it with a predetermined waveform force, and characterizing the test object qualitatively in relation to an observed modal frequency response of the test object to the excitation. | 03-19-2009 |

20090171604 | METHOD AND APPARATUS FOR COMPENSATING S-PARAMETERS OF PASSIVE CIRCUITS - The invention related to a method and circuit that is used to compensate for S-parameters of a passive circuit which do not satisfy passivity. The method includes the following steps: (1) getting S-parameters which do not satisfy passivity, these S-parameters being composed of an S-parameter matrix S; (2) computing matrix [S×S′], wherein matrix S′ is a complex conjugate transposed matrix of the S-parameter matrix S; (3) computing the eigenvalues of the matrix [S×S′], and choosing an eigenvalue Ψ whose real part real(Ψ) is the biggest; (4) computing a compensating value ξ, the compensating value ξ being equal to real(Ψ) | 07-02-2009 |

20080215272 | Fluorescence Microscope and Fluorescence Microscope Method - To increase spatial resolution by observing a sample based on saturated fluorescence components. A fluorescence microscope according to the present invention includes: a laser light source | 09-04-2008 |

20080234959 | Pitch Extraction with Inhibition of Harmonics and Sub-harmonics of the Fundamental Frequency - The fundamental frequency of a harmonic signal is estimated by forming a fundamental frequency hypothesis (f0′). A comb filter is provided based on the fundamental frequency hypothesis. The harmonic signal is filtered using the comb filter. The fundamental frequency hypothesis is tested for each tooth in the comb filter. A signal indicating an estimated fundamental frequency of the provided harmonic signal may be outputted based on the testing. | 09-25-2008 |

20080234958 | Method for Determining the Humidity and Density of a Dielectric Material - The invention relates to a method for determining the humidity and/or density of a dielectric material in a resonator that is filled with said material and that contains a transmitter and a receiver. According to said method: the transmitter emits a signal; a resonance curve of the filled resonator is scanned in stages, whereby respective signal intensity values (U | 09-25-2008 |