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8185328 |
Device, method, and program for measuring signal, and recording medium
Differences in outputs from multiple terminals are easily measured. There is provided a signal measuring device for receiving signals to be measured which are generated by modulating...
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8164322 |
Phase-difference-corresponding-value measurement device, gain imbalance measurement device, method, program, and recording medium
A modulation error measurement device according to the present invention receives a demodulated signal containing a demodulated I signal and a demodulated Q signal from a quadrature demodulator...
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8067932 |
Advanced real-time grid monitoring system and method
This invention deals with an advanced Real-time Grid Monitoring System (RTGMS) suitable for both single-phase and three-phase electric power systems. This invention provides an essential signal...
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7945407 |
Signal analyzers and frequency domain data production methods
Sets of time domain data of respective frequency bands from Fd-1 to Fd-n of a periodic input signal Fs are acquired. Sets of the time domain data of the common frequency band are extracted from the...
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7728576 |
Programmable multi-channel amplitude and phase shifting circuit
The traveling wave excitation system phase shifter chassis method and device of the invention is compact, inexpensive, and versatile when compared to customary methods for generating traveling wave...
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7511469 |
Phase measurement device using inphase and quadrature components for phase estimation
A phasemeter for estimating the phase of a signal. For multi-tone signals, multiple phase estimates may be provided. An embodiment includes components operating in the digital domain, where a...
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7378854 |
Dual sine-wave time stamp method and apparatus
A time of an event can be determined by acquiring an amplitude, at the time of the event, of at least two periodic timing signals that are out of phase with each other. The time of the event within...
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7339365 |
Phase detector and method of phase detection
In order to provide a phase detector and a method of phase detection which are distinguished by greater sensitivity and simple implementability, at least one differential signal of two input...
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7227346 |
Two channel digital phase detector
The invention is directed to a digital phase detector that comprises a splitter and phase shifter to receive a signal of a device under test and produce a first signal that is substantially...
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7135896 |
Output buffer circuit and semiconductor integrated circuit
Replica output buffers, having the same input/output characteristic as that of an output buffer, respond to the rise of a TEST signal generated by a test pulse generating circuit and causes an...
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7106064 |
Method and apparatus for quadrature detection and MRI system
A method of eliminating unnecessary frequency components using a quadrature detector. The method includes converting an analog input signal into a digital signal f1(t), and the signal f1 (t) is...
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7053626 |
Device and method for monitoring the connection of an electrical supply unit
The invention relates to a device and a method for monitoring the connection of an electrical supply unit comprising voltage detection (32) detecting phase voltage (14), current detection (32)...
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6949958 |
Phase comparator capable of tolerating a non-50% duty-cycle clocks
A method and circuit for achieving minimum latency data transfer between two mesochronous (same frequency, different phase) clock domains is disclosed. This circuit supports arbitrary phase...
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6909270 |
Phase detector capable of detecting an accumulated value of phase displacement at a high speed and frequency stability measuring apparatus for arbitrary nominal frequency using the same
A phase region detector receives in-phase signal I representing in-phase component and quadrature signal Q representing quadrature component of a first signal and second signal respectively,...
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6803776 |
Current-comparator-based four-terminal resistance bridge for power frequencies
A current comparator technique is applied to four-terminal resistance measurements for obtaining a highly accurate AC resistance bridge at power frequencies of 50 Hz to 60 Hz. Active circuits are...
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6794857 |
Apparatus and method for measuring a phase delay characteristic
A phase delay characteristic measuring apparatus includes an in-phase component calculating means for outputting a correlation value between input sampling data of the input signal and the output...
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6794858 |
Receiving level measuring circuit
A receiving level measuring circuit, which is capable of improving measuring accuracy of a receiving level by correcting phase rotation caused by a frequency error between oscillators included in a...
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6700366 |
Very fast swept spectrum analyzer
Analyzing a swept spectrum signal formed by mixing a ramping local oscillator and an input signal to generate an IF signal, the resulting IF signal having a phase change with respect to the input...
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6590377 |
Narrow band frequency detection circuit
A frequency detection circuit is disclosed that employs a phase lock loop circuit in operative cooperation with a microprocessor. The microprocessor provides a control signal to an oscillator of...
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6586922 |
Phase shift circuit and FM detector circuit
Transistors (12a, 12b) turn on and off with mutually opposite phase input signals. Capacitors (16a, 16b) discharge when the transistors (12a, 12b) turn on, and capacitors (16a, 16b) are charged by...
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6483288 |
Engagement detection circuit
An engagement detection circuit for a clock recovery circuit consisting of a phase detector (3), a counter element (6) and a flip-flop (8). By employing a low-pass element (12) and a trigger...
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6340883 |
Wide band IQ splitting apparatus and calibration method therefor with balanced amplitude and phase between I and Q
The present invention provides a wide band IQ splitting apparatus suitable for using in a spectrum analyzer. A quadrature oscillator 30 generates a pair of quadrature signals. An amplitude and...
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5808463 |
Method and apparatus for measuring adjacent channel power using complex fourier transform
A method for measuring an adjacent channel power of a device under test (DUT) such as a radio transmitter. The method comprises the steps of performing a frequency conversion to convert a...
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5789927 |
Baseband measurement of RF power amplifier distortion
An RF power amplifier distortion measurement system measures amplitude and phase distortion of a microwave/RF power amplifier by phase quadrature down-conversion of each of an RF amplifier's input...
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5241173 |
Readhead for producing signals when travelling along a scale having a set-up detector for detecting alignment of quadrature signals
A readhead 10 traverses along a scale 12, producing square wave signals in quadrature on lines 24,26. These are counted by an external counter 28 to indicate the position along the scale. The...
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5235287 |
Frequency measurement receiver with bandwidth improvement through phase shifted sampling of real signals using sampling rate selection
This is a technique for extending the frequency range which employs a power divider having two outputs, one output being supplied to a first A/D converter, and the other output being supplied via a...
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5218289 |
Electronic device for the measurement of time lags
The disclosure relates to the measurement of small time lags between a signal edge and a reference instant defined by another signal edge. It consists of the use of a signal edge for the prompting,...
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5128609 |
Setting up of quadrature signals
A device to assist in setting up the pitch, roll, yaw and standoff of a read head relative to a scale, so as to improve the quadrature relationship of its outputs. Two superimposed Lissajous...
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5001419 |
Method of deriving an AC waveform from two phase shifted electrical signals
The voltage between two objects is measured utilizing an electro-optic crystal exhibiting birefringence in two axes (slow and fast) mutually orthogonal to an optic axis extending between the two...
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4901255 |
Method and apparatus for evaluating quadrature encoders
A method and apparatus for evaluating the performance of a device, such as a quadrature encoder, which generates at least two electrical wave train signals, each varying between first and second...
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4888701 |
Apparatus for measuring vector voltage ratio
An apparatus is disclosed for providing the projections of signals supplied to two inputs on mutually perpendicular axises by applying a different combination of the signals respectively at said...
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4876489 |
Signal processing
A method of and an arrangement for the combined correction of I/Q phase and amplitude imbalances within channels and interchannel phase and amplitude mismatches in arrays of signal channels. The I...
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4812849 |
Nonquadrature correction circuit
A phase comparator has additional circuitry for correcting nonquadrature error during operation of the comparator. The phase comparator has a 90 degree power divider which receives a reference...
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4780667 |
Magnetostatic wave delay line discriminator with automatic quadrature setting and automatic calibration
A discriminator having a power divider that divides a signal under test into a signal channel component and a reference channel component. A tunable delay line, such as a magnetostatic wave delay...
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4763274 |
Machine implemented analysis eddy current data
A digital computer performs a complete eddy current analysis of the tubes of a steam generator from data input to generation of a final report. The computer extracts signatures generated by various...
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4714873 |
Microwave noise measuring apparatus
Apparatus for measuring the phase noise content of a microwave signal source (10) includes a microwave cavity (22) resonant at a fixed frequency, signal generating means (23) operable to generate a...
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4654585 |
Phase detection method
A phase detection method for use, e.g., in impedance measurements, permits accurate phase detections to be performed at a high measurement speed. Two reference signals, phase shifted by 90° from ...
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4598310 |
Circuit arrangement for obtaining a phase-sensitive control quantity, in particular in a color television receiver
A circuit arrangement for obtaining a control quantity which is dependent on the phase shift of a color burst signal comprising an amplitude factor with respect to a reference signal, preferably of...
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4459543 |
Automatic phase compensation circuit
An automatic phase compensation circuit is disclosed for use with carrier transducers. A quadrature oscillator drives the carrier transducer and provides phase reference and quadrature reference...
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4426620 |
Analog quadrature signal to phase angle data conversion by a quadrature digitizer and quadrature counter
The quadrature phase angle φ(t) of a pair of quadrature signals S1 (t) and S2 (t) is digitally encoded on a real time basis by a quadrature digitizer for fractional φ(t) rotational excursions and b...
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4409543 |
Impedance meter
An apparatus is disclosed for determining the impedance and dissipation factor of a capacitive and/or inductive device and to reduce measurement error by digital calculation and manipulation. A...
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4405895 |
Angle digitizing method
An angle digitizer receives signal representing the sine and cosine of the angle to be digitized. The voltages are fed to orthogonal pairs of input terminals. Between each two input terminals is a...
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4161011 |
Ground distance relay employing phase comparator measurement
A ground distance relay employing phase angle comparator measurement is provided with additional input signals. In one embodiment, a two input ground distance relay is provided with two additional...
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4157507 |
Electronic system for detecting direction of motion
Apparatus for detecting the direction of motion from a reference signal, R, and a quadrature signal, Q, derived from the output signals X+0 and X+90 of a position transducer, wherein the polarity...
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4071821 |
Quadrature correlation phase determining apparatus
Digital apparatus and a method are disclosed for determining the phase angle of a tone signal of known frequency by correlating a clipped version of the tone signal with a reference signal having a...
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3922602 |
Lock detector for a phase locked loop
A quadrature phase detector connected to a phase locked loop so as to receive a first signal from a voltage controlled oscillator in the loop and a second signal from the reference oscillator in...
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3875394 |
CORRELATION TYPE PHASE DETECTOR
The phase angles of each of a plurality of frequency multiplexed signals derived on a common lead and having predetermined frequencies are determined relative to predetermined phase angles of...
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3806802 |
AUTOMATIC QUADRATURE CONTROL AND MEASURING SYSTEM
A quadrature component cancellation and measuring system comprising a detection system for detecting the quadrature component from a primary signal, including reference circuitry to define the...
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3757214 |
PROGRAMMABLE MULTI-MODE PHASE SENSITIVE VOLTMETER
Phase sensitive measurements of the fundamental component of a test signal having a complex waveform is performed in two distinct modes of operation using an unshifted and shifted sine wave...
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3659210 |
PHASE DETECTION CIRCUIT
Phase detection circuit, which in the state of a voltage value indicates the difference between the phase of an incoming signal and the phase of a reference signal. The circuit is built up by an...
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