Entries |
Document | Title | Date |
20080197833 | Sound Analyzer Based on a Biomorphic Design - A device and a method for analyzing sound based on a biomorphic design are disclosed. The device comprises a plurality of amplification/filtering stages (S | 08-21-2008 |
20080238405 | RF measurement system incorporating a ream assembly and method of using the same - A radio-frequency (RF) measurement system for measuring a reflection coefficient an RF device under test (DUT) incorporates a reflection mode electro-absorption modulator (REAM) assembly coupled to the RF DUT. Also included in the measurement system, is a first optical fiber coupled to the REAM assembly, the first optical fiber configured to propagate a first optical signal into the REAM assembly and propagate a first reflected optical signal out of the REAM assembly. Furthermore, a second optical fiber is also coupled to the REAM assembly, the second optical fiber configured to propagate a second optical signal into the REAM assembly and propagate a second reflected optical signal out of the REAM assembly. | 10-02-2008 |
20080278142 | FREQUENCY CHARACTERISTIC MEASURING CIRCUIT - A frequency characteristic measuring circuit is disclosed, which includes a first diode element having differential input nodes and differential output nodes, thermally coupled to a resistance element of a differential amplifying circuit having the resistance element connected between the differential output nodes, and driven by a first constant current source, a second diode element for reference driven by a second constant current source, and a detection circuit which detects a potential difference between forward voltages of the first and second diode elements to output a signal in accordance with the detected potential difference. | 11-13-2008 |
20080284409 | Signal Recognition Method With a Low-Cost Microcontroller - The present invention relates to a signal recognition method provided that the signal is limited in time and is periodic, comprising obtaining the envelope, taking samples of the instantaneous value of its amplitude which, by means of several time parameters and their comparison with different reference matrixes, allows identifying the belonging thereof to one of said matrixes by means of the use of a low-cost microcontroller, given that the required computational power is to perform basic computation operations incorporated in the simplest microcontrollers. | 11-20-2008 |
20090021237 | Current transformer and electric energy meter - A current transformer detects a sine-wave alternating current having a maximum effective current value I | 01-22-2009 |
20090072811 | Pulse Measurement Apparatus and Method - An embodiment of the invention is directed to a pulse measuring system that measures a characteristic of an input pulse under test, particularly the pulse shape of a single-shot, nano-second duration, high shape-contrast optical or electrical pulse. An exemplary system includes a multi-stage, passive pulse replicator, wherein each successive stage introduces a fixed time delay to the input pulse under test, a repetitively-gated electronic sampling apparatus that acquires the pulse train including an entire waveform of each replica pulse, a processor that temporally aligns the replicated pulses, and an averager that temporally averages the replicated pulses to generate the pulse shape of the pulse under test. An embodiment of the invention is directed to a method for measuring an optical or an electrical pulse shape. The method includes the steps of passively replicating the pulse under test with a known time delay, temporally stacking the pulses, and temporally averaging the stacked pulses. An embodiment of the invention is directed to a method for increasing the dynamic range of a pulse measurement by a repetitively-gated electronic sampling device having a rated dynamic range capability, beyond the rated dynamic range of the sampling device; e.g., enhancing the dynamic range of an oscilloscope. The embodied technique can improve the SNR from about 300:1 to 1000:1. A dynamic range enhancement of four to seven bits may be achieved. | 03-19-2009 |
20090261807 | TEST APPARATUS, TEST METHOD, MEASUREMENT APPARATUS AND MEASUREMENT METHOD - Provided is a test apparatus for testing the jitter tolerance of a device under test which receives a data signal and a strobe signal indicating the timing at which the data signal should be received, and acquires the data signal at the timing indicated by the strobe signal, including a signal generating section which generates the data signal and the strobe signal to be supplied to the device under test, a jitter applying section which applies a combinational jitter obtained by combining a data jitter which should be tolerated for the data signal and a strobe jitter which should be tolerated for the strobe signal to the data signal or the strobe signal, and a signal supplying section which supplies the data signal and the strobe signal, to one of which the combinational jitter has been applied, to the device under test. | 10-22-2009 |
20090261808 | Method and apparatus to measure differential phase and frequency modulation distortions for audio equipment - A testing method or apparatus utilizes multiple frequencies applied to a device under test for measuring newly discovered frequency modulation effects. An embodiment may include a lower frequency signal with a smaller amplitude higher frequency signal to test a dynamic change in frequency response, gain, and or phase. This dynamic test can reveal frequency modulation effects. Another embodiment may include the use of a multiple frequency signal to dynamically induce a time varying phase or frequency distortion for the device that has differential phase distortion. The device's output is then measured with an FM detector to measure a shift in one of the frequencies used in the test signal or to measure frequency modulation effects of any signals, including distortion products, from the device. Yet another embodiment of the invention may include biasing a device with a voltage to span the output voltage range of the device while measuring harmonic or intermodulation distortion or phase or frequency response at the various operating points. | 10-22-2009 |
20100013455 | RF CIRCUIT ANALYSIS - An analysis circuit for analysing the RF response of an RF circuit, comprises a voltage controlled oscillator ( | 01-21-2010 |
20100019757 | SYSTEM AND METHOD FOR ON-CHIP DUTY CYCLE MEASUREMENT - An apparatus and method for measuring the duty cycle of a clock signal, the apparatus having a first multi-tap delay module, a second multi-tap delay module, and a multi-element detecting module, the input terminal of the first multi-tap delay module and the input terminal of the second multi-tap delay module coupled to an input node IN, the first multi-tap delay module receiving the clock signal and then providing it a first constant incremental delay at each tap, the second multi-tap delay module receiving the same clock signal CLK and then providing it a second constant incremental delay at each tap, and the multi-element detecting module determining the ratio of the number of outputs of the multi-element detecting module in which the sampled clock level is high with respect to the total number of steps covering one complete clock cycle. | 01-28-2010 |
20100026276 | Method and Apparatus for Fast Fault Detection - A method and apparatus are provided for detecting a fault condition on a power system. By rectifying power system phase voltages to produce a rectified waveform, and filtering the rectified waveform or a representation of the rectified waveform through a finite gain synchronous band pass filter to generate a synchronous band pass filter output waveform that indicates the magnitude of a predefined harmonic frequency component, a fault condition on a power system can be identified. | 02-04-2010 |
20100026277 | Waveform Observing Apparatus - There is provided a waveform observing apparatus with a reduced depth in such a manner that the waveform observing apparatus is one including a terminal board, connecting wiring extending from external equipment, a memory for receiving measured data through the terminal board, to store the measured data, and a display for displaying the measured data in waveform, the apparatus including: a first intra-body substrate, installed in an erect state inside a body frame of the waveform observing apparatus; a plurality of first connectors, provided on the first intra-body substrate; and a measurement module, which is connector-connected to the first connector of the first intra-body substrate, to be installed between the first intra-body substrate and the terminal board, and also includes a measurement circuit, wherein a plurality of measurement modules are detachable in an aligned state with respect to the erect first intra-body substrate. | 02-04-2010 |
20100052651 | PULSE WIDTH MEASUREMENT CIRCUIT - A pulse width measurement circuit | 03-04-2010 |
20100085035 | Method and apparatus for determining AC voltage waveform anomalies - A method and apparatus for determining AC voltage waveform anomalies. The apparatus comprises a threshold generator for generating at least one time-variant threshold based on information regarding an AC voltage waveform. The apparatus further comprises a threshold detector for comparing a sample of the AC voltage waveform to the at least one time-variant threshold to identify an AC voltage waveform anomaly. | 04-08-2010 |
20100090679 | APPARATUS FOR TESTING PRINTED CIRCUIT AND METHOD THEREFOR - An apparatus comprises a sensor, a power supply and a measurer. The sensor is placed over the electronic component. The power supply can supply electric power to the printed circuit; thereby the printed circuit is powered on. The measurer can measure a sensing signal through the sensor when the printed circuit is powered on. | 04-15-2010 |
20100194376 | METHOD FOR IMPLEMENTING CONTINUOUS RADIO FREQUENCY (RF) ALIGNMENT IN ADVANCED ELECTRONIC WARFARE (EW) SIGNAL STIMULATION SYSTEMS - A method for characterizing the effect of each step attenuator state, on phase and amplitude, which may include in an exemplary embodiment: activating each step attenuator state as the sole contributor to attenuation, and measuring at least one of a step attenuator amplitude contribution (SAAC) and/or a step attenuator phase contribution (SAPC). | 08-05-2010 |
20100271001 | ELECTROMAGNETIC WAVE MEASURING APPARATUS, MEASUREMENT METHOD, A PROGRAM, AND A RECORDING MEDIUM - According to the present invention, the CT is carried out based on parameters other than the absorption rate. An electromagnetic wave measurement device includes an electromagnetic wave output device | 10-28-2010 |
20100327848 | PULSED ECHO PROPAGATION DEVICE AND METHOD FOR MEASURING A PARAMETER - At least one embodiment is directed to a sensor for measuring a parameter. A signal path of the system comprises an amplifier ( | 12-30-2010 |
20110050205 | OSCILLOGRAPH AND SIGNAL IDENTIFYING METHOD OF A SERIAL DATA BUS USING THE OSCILLOGRAPH - An oscillograph can identify signals of a serial data bus. The signal identifying method triggers communication channels of the oscillograph, measures a rise time and a fall time for each captured signal, and sets a sender terminal (ST) and a receiver terminal (RT) for each of the captured signals according to the measured results. The signal identifying method determines the ST and RT for each of the captured signals after the oscillograph is triggered. If the determined ST of each of the acquired signals is identical to the set ST and the determined RT of the each of the acquired signals is identical with the set RT, the signal identifying process is completed and a report is generated to record the signal identifying result. | 03-03-2011 |
20110057641 | METHOD AND APPARATUS FOR CURRENT MEASUREMENT IN PHASE LINES - In a method for current measurement in a multiphase current network, a conductive connection is produced between a plurality of the phases of the multiphase current network such that the plurality of the phases is short-circuited with one another. At a detection time, a current value flowing between the conductive connection and a first voltage potential is detected. | 03-10-2011 |
20110057642 | TEST APPARATUS FOR DIGITAL MODULATED SIGNAL - An amplitude expected value data generator generates amplitude expected value data that represents, in increments of sampling points, which of multiple amplitude segments the amplitude of a modulated signal waveform that corresponds to the expected value of data to be output from a device under test belongs to. A demodulator performs sampling of the signal waveform to be tested received from the device under test, and generates judgment data that represents, in increments of sampling points, which of the multiple amplitude segments the amplitude of the signal waveform belongs to. A judgment unit makes a comparison between the amplitude expected value data and the judgment data in increments of sampling points. | 03-10-2011 |
20110080158 | COAXIAL CABLE CONNECTOR WITH INTERNAL FLOATING GROUND CIRCUITRY AND METHOD OF USE THEREOF - A coaxial cable connector is provided, the connector includes: a connector body and a ground isolation circuit positioned within the connector body. The ground isolation circuit is configured to generate a voltage signal comprising a positive voltage and a negative voltage. The ground isolation circuit is electrically isolated from the connector body. | 04-07-2011 |
20110101957 | Method for Reconstructing Sparse Signals from Distorted Measurements - A signal x is reconstructed by measuring the signal x as a vector y of measurements y | 05-05-2011 |
20110267030 | DRIVING AN ELECTRONIC INSTRUMENT - Circuitry includes a pre-amplifier having a differential output, where the differential output corresponds to a common mode voltage; a multiplexer including sets of transistors, each of which has a control input; a comparator including input terminals, a first terminal of the input terminals to receive a signal that is based on an output of the multiplexer, and a second terminal of the input terminals to receive a threshold voltage; a compensation circuit to produce a divided voltage that varies in accordance with variations in the common mode voltage; and an amplifier to receive a predefined voltage and to use the divided voltage to affect the predefined voltage to produce the threshold voltage for the comparator. Signals in the differential output of the pre-amplifier are applicable to corresponding control inputs in the sets of transistors. | 11-03-2011 |
20120081104 | METHOD FOR MEASUREMENT OF TOTAL HARMONIC DISTORTION - A method of measuring the total harmonic distortion in an electrical distribution system. The distribution system is sampled regularly to generate a set of data. The data is filtered using a narrow band filtering algorithm to measure the energy in fundamental and other harmonic frequencies. Due to the filtering, the energy in harmonic frequencies can be measured without interference from broadband noise, which provides an improvement in the measurement of total harmonic distortion at low current or voltage levels. A method is provided to sum the energy in identified frequencies in a multi-pass configuration, such that only a subset of all monitored frequencies are filtered and summed in each pass, with the balance being filtered and measured in subsequent passes. After all subsets are measured, the total harmonic distortion is calculated. | 04-05-2012 |
20120268104 | SIGNAL DETECTION APPARATUS FOR SAS DEVICES - A signal detection apparatus for a serial attached SCSI (SAS) device includes an SAS female connector to be connected to a SAS device, an SAS male connector to be connected to a system, and first to fourth pairs of subminiature version A (SMA) connectors. When the first pair of SMA connectors is connected to an oscillograph to detect a pair of output signals from the SAS device, the second and third pairs of SMA connectors connect the SAS device with the system. When the second pair of SMA connector is connected to the oscillograph to detect another pair of output signals from the SAS device, the first and fourth pairs of SMA connectors connect the SAS device with the system. | 10-25-2012 |
20120326701 | Configurable Process Variation Monitoring Circuit of Die and Monitoring Method Thereof - The present invention discloses a configurable process variation monitoring circuit of a die and monitoring method thereof. The monitoring method includes a ring oscillator, a frequency divider and a frequency detector. The ring oscillator includes a plurality of first standard cells, a plurality of second standard cells and a plurality of multiplexers. The ring oscillator generates an oscillation signal in a first mode or a second mode according to a selection signal. The frequency divider is coupled to the ring oscillator and divides the oscillation signal by a value to generate a divided signal. The frequency divider is coupled to the frequency divider and counts periods of the divided signal by a base clock to generate an output value where the output value is related to the process variation. | 12-27-2012 |
20120326702 | ELECTROMAGNETIC WAVE RESONATOR AND ITS FABRICATION PROCESS AS WELL AS ELECTROMAGNETIC WAVE GENERATOR - The main object of the invention is to provide an electromagnetic wave resonator making use of surface waves: an electromagnetic wave resonator structure capable of being achieved with existing technologies yet without much difficulty and applying voltage to a positive dielectric area, thereby overcoming a variety of problems arising from the fact that only thermal excitation is available. | 12-27-2012 |
20130057252 | APPARATUS AND METHOD FOR DETERMINING DIELECTRIC ACCESS IN PORTABLE TERMINAL - An apparatus and method determine a dielectric access in a portable terminal. The method includes generating a TX signal of a specific frequency band by performing frequency conversion, modulation, and digital/analog conversion. The method also includes detecting the power of the TX signal and converting the detected power using Analog-to-Digital Conversion (ADC). The method further includes loading an ADC table defining values for determining the approach/withdrawal of a dielectric to/from the portable terminal, and comparing the power of the TX signal and the ADC table to determine the approach/withdrawal of a dielectric to/from the portable terminal. | 03-07-2013 |
20130265034 | METHOD AND APPARATUS OF DYNAMIC FAST SPECTRAL SURVEY - A method and apparatus for multi-resolution multi-bandwidth spectral signal estimation is provided herein. During operation, a plurality of detectors is provided to determine if an input signal is above a predetermined threshold. The input signal comprises a first frequency range having a first bandwidth. If it is determined that the input signal of the first bandwidth is above a first predetermined threshold, then the same plurality of detectors are used to further analyze sub-bands of the first frequency range, each sub-band having a second bandwidth less than the first bandwidth. The further analysis determines if an input signal to a detector is above a second predetermined threshold. | 10-10-2013 |
20130307523 | ANALOG UNIT OF SEQUENCER SYSTEM - An analog unit having a multiple-channel configuration among analog units included in a sequencer system is such that an AC signal as a measurement target, which is captured by a CT sensor, can be directly input to each of a plurality of channels, and the analog unit includes a setting unit that sets, in an internal memory, an abnormality-determination peak current value and an abnormal peak current duration, which are applied to the AC signal as a measurement target, for each of the channels, and a detecting unit that, when the AC signal as a measurement target includes an AC signal that maintains a state where a peak value exceeds the abnormality-determination peak current value for the abnormal peak current duration, detects generation of an abnormal alternating current in each of the channels. | 11-21-2013 |
20140021938 | MULTI-CHANNEL PWM WAVEFORM MEASURING DEVICE - The present invention relates to a multi-channel PWM waveform measuring device, and more particularly, to a multi-channel PWM waveform measuring device which maximally prevents the loss of an expensive power semiconductor device during the diagnostic process of a complex servo drive and reduces damage of the PCB of the servo drive in order to restore the servo drive safely and quickly. In a multi-channel PWM waveform measuring device for checking a PWM output state of a main control PCB of a servo drive, provided are: a measurement jig outputting a measurement signal to a communication cable through a plurality of probes, which are pre-installed corresponding to each of the measurement points of an inverter and converter for measuring PWM waveforms, wherein the main control PCB of a detachable servo drive, i.e. a checking target, is connected to the base terminal of a transistor equipped in the pre-installed inverter and converter through a connector; a signal processing unit collecting measurement signals through the communication cable and outputting a measurement signal of a probe connected to a switch which is in an on-state through a manipulation button; and a signal outputting unit outputting a PWM waveform on a screen, wherein a measurement signal inputted from the signal processing unit represents a change of an input voltage with respect to time. | 01-23-2014 |
20140035559 | TRANSIENT RECOVERY VOLTAGE MEASURING DEVICE, TRANSIENT RECOVERY VOLTAGE MEASURING METHOD, AND TRANSIENT RECOVERY VOLTAGE MEASURING PROGRAM - A common tangent line drawn between a rise portion present from the origin to a second reference voltage and a rise portion corresponding to the second reference voltage can be easily generated through a waveform conversion. A transient recovery voltage measuring device includes a memory storing a transient recovery voltage waveform of a multiple frequency, a waveform conversion unit converting the transient recovery voltage waveform, a wave height determination unit determining two points having the same maximum value on the converted waveform, an adjustment unit adjusting the proportional constant of the waveform conversion unit to determine those two points by the wave height determination unit, a contact point detection unit obtaining two points corresponding to the determined two points determined by the wave height determination unit, and a tangent line generation unit generating a first tangent line passing through the detected two points on the transient recovery voltage waveform. | 02-06-2014 |
20140117973 | ANALYSIS METHOD FOR SIGNAL TIME MARGIN - An analysis method for a signal time margin is provided. An input signal is received. The input signal is extracted to obtain a primary waveform, at least one first secondary waveform and at least one second secondary waveform of the input signal. The first secondary waveform and the second secondary waveform are respectively located before and after the primary waveform. Quantities of the first secondary waveform and the second secondary waveform are counted to respectively generate a first quantity and a second quantity. According to the first quantity, the primary waveform and the first secondary waveform, first bit combinations are generated, and according to the second quantity, the primary waveform and the second secondary waveform, second bit combinations are generated. The first and second bit combinations are integrated to generate third bit combinations. Signal analysis is performed on the third bit combinations to obtain a signal time margin. | 05-01-2014 |
20140368184 | ELECTROMAGNETIC WAVE SIGNAL PROCESSOR AND ELECTROMAGNETIC WAVE DETECTOR - There is provided an electromagnetic wave signal processor configured to process an input pulse signal corresponding to an electromagnetic wave, comprising a signal processing unit including: a peak detecting circuit to detect peak values of each amplitude of the input pulse signal; an AD converter to convert the peak values into digital signals; a memory device comprising memory cells each having an address assigned in accordance with each of values capable of being taken by the digital signals of the peak values, and being able to have any one of a plurality of internal states representing detection frequencies of the peak values; and a writing circuit to change the internal state in the memory cell that has the address corresponding to the value of each digital signal converted by the AD converter, so as to increment the detection frequency represented by the internal state. | 12-18-2014 |
20160109493 | POWER FLOW MANAGEMENT METHOD AND CONTROLLER USING THE SAME - A power flow management method and a controller are provided. First, sensing voltage signals and sensing current signals between a power supplying module and a multilevel converter module are obtained. Positive sequence voltage signals, positive sequence current, negative voltage signals and negative current signals are generated according to the sensing voltage signals and the sensing current signals. Forward powers are calculated according to the positive sequence voltage signals, positive sequence current, negative voltage signals and negative current signals. DC voltage signals are obtained from the multilevel converter module, and feedback powers are calculated accordingly. A magnitude and a phase of a zero sequence voltage injection signal are determined according to the forward powers and the feedback powers. Accordingly, the generated zero sequence voltage injection signal is used to manage power flow effectively. | 04-21-2016 |
20160187392 | DATA RECEIVING DEVICE INCLUDING AN ENVELOPE DETECTOR AND RELATED METHODS - A data receiving device may include an envelope detector that may include first and second inputs configured to receive a differential input signal, a first pair of detectors coupled to the first input and configured to generate first and second detector outputs, and a second pair of detectors coupled to the second input and configured to generate third and fourth detector outputs. The envelope detector may also include a logic circuit configured to generate a reset based upon the first and third detectors. The data receiving device may also include a receiver circuit coupled to the envelope detector and configured to generate an output based upon the second and fourth detectors along with the reset, and a first bit detection circuit coupled to the receiver circuit. | 06-30-2016 |