Class / Patent application number | Description | Number of patent applications / Date published |
702106000 | Signal frequency or phase correction | 28 |
20080262775 | Frequency error estimation algorithm - A frequency error estimation algorithm is presented for use in radio receivers, for example. The present algorithm utilizes irregular time intervals between pilot symbols to improve the frequency range of the estimate. First, a first phase rotation indicator comprising information on phase rotation of a received signal within a first time interval is estimated. Then, a second phase rotation indicator comprising information on phase rotation of the received signal within a second time interval of a different length than the first time interval is estimated. A frequency error estimate is calculated from the phase difference between the first phase rotation indicator and the second phase rotation indicator, for example by dividing the phase difference by the difference in the lengths of the first and the second time interval. | 10-23-2008 |
20090093986 | Method and Apparatus for Elimination of Spurious Response due to Mixer Feed-Through - A method for correcting feed through signals for use with an oscilloscope employing Digital Bandwidth Interleaving is provided. The method comprises the steps of converting an original signal to a frequency other than an original frequency of the original signal, determining one or more feed through signals not converted with the original signal, providing an offsetting correction signal and combining the converted signal, the non-converted feed through signal, and the offsetting correction signal. | 04-09-2009 |
20090119052 | INTEGRATED MARGIN TESTING - A margin testing system comprises a margin testing controller and a frequency control module. The margin testing controller is internal to and integrated with an electronic system under test and is coupled with a plurality of components that are configured to provide the functionality of the electronic system under test. The plurality of components includes a processor of the electronic system under test. The frequency control module is in communication with the margin testing controller. The frequency control module is configured for varying a clock frequency associated with at least one of the components for frequency margin testing the at least one of the components in response to command of the margin testing controller. | 05-07-2009 |
20090144009 | System and method for baseband calibration - A system comprises at least one of a first generator, at least two of a second generator, and a load board. The at least one of a first generator one of receives and transmits analog signals. The at least two of a second generator one of receives and transmits digital signals. The load board is disposed between the first generator and the second generators and electrically coupled therebetween to calibrate parameters relating to communications. The load board includes a direct path for each of the analog signals between the at least one of the first generator and a corresponding number of devices under test and for each of the digital signals between the at least two of the second generator and a corresponding number of devices under test. | 06-04-2009 |
20090319217 | HF MEASUREMENT SYSTEM, METHOD FOR THE CALIBRATION THEREOF, AND METHOD FOR DETERMINING SCATTERING PARAMETERS WITH THIS HF MEASUREMENT SYSTEM - A method for calibrating a high frequency measurement device having N measurement ports, where N is an integer ≧1, in particular a vector network analyzer, for determining scattering parameters of a measurement object with an n-port measurement, where n is an integer ≧1, wherein a high frequency test signal is fed into a first electrical lead connected to the measurement object or to a circuit having the measurement object, wherein for each port, an HF signal running on a second electrical lead, connected to the measurement object is coupled out from the second electrical lead at a first coupling position and at a second coupling position placed at a distance from the first coupling position, wherein from the two HF signals coupled out, in each port, for each measuring site or coupling site, an amplitude and/or a phase, relative to the HF test signal, of an HF signal running on the second electrical lead to the measurement object and of an HF signal running on the second electrical lead away from the measurement object are determined and therefrom, scattering parameters of the measurement object are calculated. | 12-24-2009 |
20100010767 | Method Of Controlling Clock Signal - A method of controlling a clock signal with a print controller is provided. In response to receiving an external signal, the print controller determines the number of cycles of a clock signal generated by a ring oscillator of the print controller during a predetermined number of cycles of the external signal or the number of cycles of the external signal during a predetermined number of cycles of the clock signal and outputs the determined number of cycles to an external circuit. In response to receiving a trim value from clock trim circuitry of the print controller which trims the frequency of the clock signal based on the determined number of cycles from the external circuit, the trim value is stored in memory of the print controller. The clock trim circuitry is controlled to trim the frequency of the clock signal generated by the ring oscillator using the trim value. | 01-14-2010 |
20100185409 | SIGNAL PROCESSING APPARATUS FOR COMPUTING POSITION OR ANGLE OF TARGET OBJECT - A signal processing apparatus which computes a position or angle of a target object based on a first phase signal (A), a first reversed phase signal (A′) having a phase opposite to that of the first phase signal (A), a second phase signal (B) having a phase different from that of the first phase signal (A), and a second reversed phase signal (B′) having a phase opposite to that of the second phase signal (B) which are provided by a detecting apparatus that detects the position or angle of the target object, comprises a first computing unit which computes (A−A′)/(A+A′) as a cosine signal and (B−B′)/(B+B′) as a sine signal, and a second computing unit which computes the position or angle of the target object based on the cosine signal and the sine signal. | 07-22-2010 |
20100228514 | DELAY LOCK LOOP DELAY ADJUSTING METHOD AND APPARATUS - Systems and methods for synchronizing communication between devices include using a test circuit to measure a propagation time through a delay circuit. The propagation time is used to determine an initial delay value within a delay lock loop. This delay value is then changed until a preferred delay value, resulting in synchronization, is found. In various embodiments, used of the initial delay value increases the speed, reliability or other beneficial features of the synchronization. | 09-09-2010 |
20100241389 | EXCITATION UNIFORMITY - Systems, methods, and other embodiments associated with MRI excitation are described. One example method includes performing a calibration to determine a set of transmission parameters for a set of excitation pulses for transmission channels available on a multi-channel MRI transmitter. The set of excitation pulses are configured to produce a resulting nuclear magnetic resonance (NMR) signal from an object exposed to the set of excitation pulses. The resulting NMR signal comprises NMR signal associated with a first NMR resonance associated with the object and NMR signal associated with a second NMR resonance associated with the object. | 09-23-2010 |
20100250182 | SPECTRAL IMAGING APPARATUS PROVIDED WITH SPECTRAL TRANSMITTANCE VARIABLE ELEMENT AND METHOD OF ADJUSTING SPECTRAL TRANSMITTANCE VARIABLE ELEMENT IN SPECTRAL IMAGING APPARATUS - A spectral imaging apparatus includes: a spectral transmittance variable element having a spectral transmittance characteristics such that a transmittance periodically varies with wavelength and being capable of changing the variation period, for converting light from an object under observation into light having a plurality of peak wavelengths; a light extracting device for extracting, from the light having a plurality of peak wavelengths, light for imaging that contains a peak wavelength proximate to a predetermined command wavelength designated by a user and light for calibration that contains a peak wavelength other than the peak wavelength proximate to the command wavelength; an image sensor for capturing an image of the object under observation formed of the light for imaging; a detector for detecting, from the light for calibration, the peak wavelength other than the peak wavelength proximate to the command wavelength; and a control unit including, an operation processing section that calculates the peak wavelength that is proximate to the command wavelength and is contained in the light for imaging, from the peak wavelength that is other than the peak wavelength proximate to the command wavelength, is contained in the light for calibration and is detected by the detector, calculates an amount of shift between the peak wavelength proximate to the command wavelength as calculated and the command wavelength, and determines an amount of adjustment of the variation period on a basis of the amount of shift, and a drive processing section that drives the spectral transmittance variable element for changing the variation period. | 09-30-2010 |
20100312515 | Test apparatus, performance board and calibration board - Provided is a test apparatus that tests a device under test, comprising a waveform generator that generates a test signal to be supplied to the device under test; a digitizer that measures a response signal output by the device under test; a judging section that judges acceptability of the device under test based on the measurement result of the digitizer; and a loop-back path that connects an output terminal of the waveform generator to an input terminal of the digitizer when calibration is performed for the waveform generator and the digitizer. The loop-back path includes a noise removal filter that eliminates a noise component from a signal passed therethrough; and a path switching section that connects the waveform generator to the digitizer via the noise removal filter when the digitizer is being calibrated, and connects the waveform generator to the digitizer without including the noise removal filter therebetween when the waveform generator is being calibrated. | 12-09-2010 |
20100318309 | Compensating for System Delay and/or Extraneous Illumination in Analyte Analyzation - A sensor that determines information related to a gaseous analyte in a body of fluid. The sensor comprises an emitter, a luminescable medium, a radiation sensor, and a processor. The emitter emits electromagnetic radiation having an oscillating intensity. The luminescable medium communicates with the body of fluid and emits luminescent radiation in response to the received electromagnetic radiation. The radiation sensor receives the luminescent radiation, and generates an output signal based on the intensity of the received luminescent radiation. The processor samples the output signal generated by the radiation sensor at two or more predetermined periodic points over the oscillation of the intensity of the electromagnetic radiation to determine information from the samples related to a phase difference between the oscillation of the intensity of the electromagnetic radiation emitted by the emitter and oscillation of the intensity of the luminescent radiation received by the radiation sensor. | 12-16-2010 |
20110093233 | THROUGH-TIME RADIAL GRAPPA CALIBRATION - Example systems and methods control a parallel magnetic resonance imaging (pMRI) apparatus to acquire radial calibration data sets throughout time. Example systems and methods also control the pMRI apparatus to acquire an under-sampled radial data set from the object to be imaged. Example systems and methods then control the pMRI apparatus to reconstruct an image of the object to be imaged from the under-sampled radial data set. The reconstruction depends, at least in part, on a through-time radial GRAPPA calibration where a value for a point missing from k-space in the under-sampled radial data set is computed using a GRAPPA weight set calibrated and applied for the missing point. The GRAPPA weight set is computed from data in the radial calibration data sets. | 04-21-2011 |
20110191053 | METHOD AND APPARATUS FOR A REAL TIME SIGNAL INTEGRITY OSCILLOSCOPE - A system, method, and apparatus for obtaining a record of logic level transitions within a signal, and for accurately determining a voltage-time pair exhibited by the signal. To achieve these ends, a front-end device may be mated to a real-time sampling system, such as an oscilloscope. The front-end device effectively permits the oscilloscope to observe signals exhibiting greater data rates than otherwise possible without the front-end device. | 08-04-2011 |
20110224937 | CURRENT DETECTOR - Provided is a current detector that, even when the skin effect occurs in a conductor in which a current flows, can detect the current flowing in the conductor with high accuracy. A sensor part that is provided near a conductor and detects magnetic flux in a predetermined magnetic flux detection direction, a current detection part that detects a current flowing in the conductor based on a detection value of the sensor part, a current frequency acquisition part that acquires a current frequency as a frequency of the current flowing in the conductor, and a correction part that corrects the detection value of the sensor part based on the current frequency are provided. | 09-15-2011 |
20110301905 | METHODS FOR CALIBRATION OF RADIO-FREQUENCY PATH LOSS IN RADIO-FREQUENCY TEST EQUIPMENT - Calibration equipment for calibrating multiple test stations in a test system is provided. Each test station may include a test unit, a test fixture, and a radio-frequency (RF) cable that connects the test unit to the test fixture. A control test setup may be used to calibrate uplink and downlink characteristics associated with each test station (e.g., to determine path loss associated with the RF cable and test fixture and variations associated with the test unit). The control test setup may calibrate each test station at desired frequencies to generate a test station error (offset) table. The test unit of each test station may be individually configured based on the test station error table so that offset is minimized among the different stations and so that the test stations may reliably measure hundreds or thousands of wireless electronic devices during product testing. | 12-08-2011 |
20110313707 | CORRECTING IN-LINE SPECTROPHOTOMETER MEASUREMENTS IN THE PRESENCE OF A BANDING DEFECT - What is disclosed is a novel system and method for detecting and correcting for In-Line-Spectrophotometer (ILS) measurements of constant value patches in the presence of banding in multi-function document reproduction systems. The present system analyzes the ILS data stream to identify structured noise components due to banding. An FFT is performed on each L*a*b* component in the ILS stream for a single test page. The peak frequencies from the FFT of the L* a* and b* channels are compared. Common frequencies in all 3 channels indicate a banding component. Once the banding frequencies and the banding wavelength are known, the color patch target can be adjusted to ensure the color patches are synchronized to the banding wavelength. By running a series of synchronized patches and averaging results, structured noise can be eliminated. In such a manner, a reduction of banding effects on color calibration can be effectuated. | 12-22-2011 |
20110320159 | OSCILLOSCOPE PROBE CALIBRATING SYSTEM - An oscilloscope probe calibrating system for a single terminal probe and a differential probe includes an oscilloscope, a main branch module, a sub-branch module, and a resistor. The oscilloscope includes multiple inputs for receiving signals from the single terminal probe and the differential probe, an output for outputting an original calibration signal, and a display module displaying the waveforms of the original calibration signal and the signals from the single terminal probe and the differential probe. The main branch module converts the original calibration signals to a number of first calibration signals. The sub-branch module converts the first calibration signals to a number of second calibration signals. The sub-branch module includes a single terminal sub-branch module and a differential sub-branch module coupled to the main branch module. One end of the resistor is connected between the main branch module and the differential sub-branch module, and the other end is grounded. | 12-29-2011 |
20120109565 | LEAKAGE MAGNETIC FLUX FLAW INSPECTION METHOD AND DEVICE - A magnetic flux leakage inspection method generates a magnetic flux parallel to a surface of an inspected object, and detects a magnetic flux that leaks from the surface of the inspected object with a magnetic sensor. The method includes exciting coils that generate an alternating magnetic field having a variable frequency, an exciting coil power source, a magnetic sensor, a lock-in detector, and a signal analyzer that analyzes changes of a signal intensity and a phase of the output of the magnetic sensor with output signals of the lock-in detector. The method obtains cosine or sine as a trigonometric function of a phase obtained by adding to the phase at each measurement point of multipoint measurement, an adjustment phase common to all the measurement points, and displays an analytical value obtained by multiplying the signal intensity and the sine or cosine at each measurement point with any adjustment phase. | 05-03-2012 |
20120197577 | Calibration Method for Radio Frequency Scattering Parameter Measurements - A calibration method for radio frequency scattering parameter measurements enabling self-calibration, which calibration method using a transmission line segment calibrator, a series device calibrator, a shunt device calibrator and a tested object measuring instrument, in which the lengths of the transmission lines in the series device calibrator and the shunt device calibrator are equal to the length of the transmission lines in the tested object measuring instrument such that the series device calibrator and the shunt device calibrator have the same error box as the tested object measuring instrument; and after acquiring the scattering parameter matrix of the error box through the calibration method, it is possible to connect a tested electronic device onto the tested object measuring instrument and perform operations on uncorrected measurement data thereof thereby obtaining the radio frequency scattering parameter of the tested object. | 08-02-2012 |
20120221277 | METHODS FOR CALIBRATING OVER-THE-AIR PATH LOSS IN OVER-THE-AIR RADIO-FREQUESNCY TEST SYSTEMS - Calibration equipment for calibrating multiple test stations in a test system is provided. Each test station may include a test unit, a test chamber with an over-the-air antenna, and a radio-frequency (RF) cable that connects the test unit to the test chamber. Reference devices under test (DUTs) may be used to calibrate uplink and downlink path loss (e.g., OTA path loss, RF cable path loss, and variations of the test unit) associated with each test station. The reference DUTs may calibrate each test station at desired frequencies to generate a path loss table. Once calibrated, the test chambers may be used during production testing to test factory DUTs. During production testing, the transmit/receive power efficiency of each factory DUT may be calculated based on values in the path loss table to determine whether a particular production DUT is a passing or failing DUT according to pass/fail criteria. | 08-30-2012 |
20120271584 | SYSTEM AND METHOD FOR PROSPECTIVE CORRECTION OF HIGH ORDER EDDY-CURRENT-INDUCED DISTORTION IN DIFFUSION-WEIGHTED ECHO PLANAR IMAGING - A computer is programmed to acquire calibration data from a calibration scan, the calibration data configured to characterize high order eddy current (HOEC) generated magnetic field error of an imaging system. The computer is also programmed to process the calibration data to generate a plurality of basis coefficients and a plurality of time constants and to calculate a plurality of basis correction coefficients based on the plurality of basis coefficients, the plurality of time constants, and gradient waveforms in a given pulse sequence. The computer is further programmed to execute a diffusion-weighted imaging scan that comprises application of a DW-EPI pulse sequence to acquire MR data from an imaging subject and reconstruction of an image based on the acquired MR data. The computer is also programmed to apply HOEC-generated magnetic field error correction during application of the DW-EPI pulse sequence configured to reduce HOEC-induced distortion in the reconstructed image. | 10-25-2012 |
20130060501 | Calibration Method for Radio Frequency Scattering Parameter Measurement Applying Three Calibrators and Measurement Structure Thereof - A calibration method for radio frequency scattering parameter measurement applying three calibrators and measurement structure thereof, comprising a transmission line segment calibrator, an offset series device calibrator, an offset shunt device calibrator and a tested object measuring instrument, wherein the length of the transmission lines for the offset series device calibrator and the offset shunt device calibrator is equal to the one of the transmission line for the tested object measuring instrument such that the offset series device calibrator, the offset shunt device calibrator and the tested object measuring instrument have the identical error boxes, and after having acquired the scattering parameter matrix of the error box by means of the calibration method, it is possible to connect the tested electronic device onto the tested object measuring instrument and perform operations on uncorrected measurement data thereof thereby obtaining the radio frequency scattering parameter of the tested object. | 03-07-2013 |
20130110442 | CALIBRATING RECONSTRUCTED SIGNAL USING MULTI-TONE CALIBRATION SIGNAL | 05-02-2013 |
20140039824 | Adaptive Notch Filter - A patient monitoring device and method that determines and monitors at least one patient parameter is provided. A configuration processor generates configuration information in response to a first input signal and an adaptive notch filter receives a second input signal. The second input signal includes a signal of interest and an interference signal in a predetermined frequency range. The adaptive notch filter automatically estimates the interference signal within the second input signal based on a filter parameter and removes the estimated interference signal from the second input signal to generate a target signal. A step processor is electrically coupled between the configuration processor and the adaptive notch filter and sets a value of the filter parameter based on the configuration information, wherein the adaptive notch filter uses the filter parameter to reduce a ringing artifact on the target signal below a threshold level. | 02-06-2014 |
20150094978 | OPTICAL COHERENCE TOMOGRAPHY DEVICE - An optical coherence tomography device includes an SS-OCT optical system which includes a wavelength swept optical source which sweeps an emission wavelength, an optical splitter which splits an interference signal light caused by interference between a measurement light and a reference light into a first interference signal light and a second interference signal light having a phase difference from the first interference signal light, a balance detector which includes a first detector configured to detect the first interference signal light and a second detector configured to detect the second interference signal light, and which processes detection signals from the first and second detectors to perform balance detection, and an optical member which is disposed between the optical splitter and one of the first detector and the second detector to generate a fixed pattern noise by one of the first interference signal light and the second interference signal light. | 04-02-2015 |
20160061870 | ELECTRIC POWER METER - An electric power meter for measuring electric power is provided. The power meter has a frequency domain converter arranged to convert a sequence of digital voltage samples from the time domain to a frequency domain obtaining digital voltage frequency components, and to convert a sequence of digital current samples from the time domain to the frequency domain obtaining digital current frequency components. The electric power meter also has a frequency domain correction unit arranged to correct the voltage frequency components and the current frequency components by multiplying at least one frequency component of the current frequency components and the voltage frequency components with a complex correction factor using a complex multiplication unit. Electric power is computed by an energy calculation unit. | 03-03-2016 |
20160377694 | METHOD AND SYSTEM FOR CORRECTING ACQUISITION CHANNEL OF MERGING UINIT IN POWER SYSTEM - The present invention relates to a method and system for correcting acquisition channel of merging unit in power system which belong to the technical field of simulation data collection of power system. The present invention performs data acquisition of each channel firstly, and the acquired data is continuous and effective frequency data, then the collected data is stored to their respective backup areas, and the data storage is stopped until the amount of stored data is up to a predetermined value required for correcting, the data is corrected finally within the respective backup areas of each channel which stops the data storage. The correction process is performed by using corresponding correction module. The method for the channel correction improves the efficiency of channel correction greatly, reduces the correction error, improves the correction precision, and has more simple and convenient operation in comparison to the conventional method for channel correction by modifying hardware parameters. | 12-29-2016 |