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| Number | Title | Issue Date |
| 7401001 | Position determining A position determining system for determining a position of a rotor of a rotating motor has sensors that are coupled to the rotor. The sensors generate, in response to a rotation of the rotor, a quadrature signal that has sine and cosine components. The position det... | 07/15/2008 |
| 7397865 | Systems and methods of using IQ modulation for calibration or measurement A system analyzer may generate an estimated frequency response of a device, system, communication medium, or combination thereof by utilizing a stimulus signal that is robust against IQ modulator impairments. A stimulus generator may be used to generate a plurality ... | 07/08/2008 |
| 7342603 | Image output test system and method and device thereof The present invention is to provide an image output test system, which is built in between an image output device and an image output test device, in which the image output test device can receive a first video signal, convert the first video signal into a second vi... | 03/11/2008 |
| 7286604 | Carrier interferometry coding and multicarrier processing Carrier Interferometry (CI) codes include families of orthogonal polyphase codes that have no length restrictions and can be used for direct-sequence and multicarrier coding. Quasi-orthogonal CI channel codes simultaneously improve probability-of-error performance a... | 10/23/2007 |
| 7254508 | Site loops A method for use with a test system having sites that hold devices under test (DUTs) includes executing a first site loop to iterate through the sites, where the first site loop includes an instruction to program hardware associated with at least one of the sites, a... | 08/07/2007 |
| 7236899 | Micro-magnetization analysis program, method, and apparatus A micro-magnetization analysis program, method, and apparatus which can analyze transitional change of a micro-magnetization state while one of a plurality of magnetic substances such as a recording medium and a recording head is moved in an arbitrary direction. An ... | 06/26/2007 |
| 7212815 | Quality evaluation method The invention relates to a method for evaluating the quality of a signal transmission path (2) presenting non-linear distortions. According to said method a specified test signal is sent from a transmitter (1) to a receiver (3). First the level ... | 05/01/2007 |
| 7151483 | System and method for concurrent operation of multiple radar or active sonar systems on a common frequency A system and corresponding method for the concurrent operation of multiple radar systems on a common frequency and in the same geographical area includes a waveform generator that specifies certain operating parameters for the transmitted radar pulses. In a first in... | 12/19/2006 |
| 7127351 | Combined parallel and sequential detection for GPS signal acquisition A two part signal acquisition process includes a parallel signal detection process and signal verification/false alarm rejection process. A massively parallel architecture of acquisition correlators search a large region of the time-frequency uncertainty during the ... | 10/24/2006 |
| 6931579 | Integrated excitation/extraction system for test and measurement An integrated test core for mixed-signal circuits comprises a periodic waveform generator capable of generating arbitrary band-limited waveforms for excitation purposes and a waveform digitizer for extracting an arbitrary waveform from the test circuit's analog resp... | 08/16/2005 |
| 6853939 | Systems and methods for multiple winding impulse frequency response analysis test The winding testing unit provides systems and methods for determining normal and/or abnormal characteristic signatures of same-voltage windings residing in a device, such as transformer, without the need for a comparison to past historical data. A plurality of chara... | 02/08/2005 |
| 6813577 | Speaker detecting device By the speaker detecting device, the test signal is supplied to the output terminal to which the speaker is to be connected. If a speaker is connected to the output terminal, the test sound is output via the speaker. If no speaker is connected to the output terminal... | 11/02/2004 |
| 6687630 | Low leakage technique for determining power spectra of non-coherently sampled data A technique for determining the amplitudes of frequency components of a waveform sampled from an automatic test system includes assembling a list of N frequencies expected to be found in the sampled waveform. A test program running on the tester generally... | 02/03/2004 |
| 6405147 | Signal transfer device measurement system and method A signal transfer device measurement system and method of the present invention measures the signal transfer characteristics of a device under test (DUT) having an analog input port and either an analog output port or a digital output port. The measuremen... | 06/11/2002 |
| 6272441 | Method for determining the pulse response of a broad band linear system and a measuring circuit for carrying out the method The invention relates to a method for the determination of the impulse response g(t) of a broad band linear system. The method can be used for the application of high frequency technology. For a test signal, a maximum length binary sequence (MLBS) is empl... | 08/07/2001 |
| 6018702 | Tuned filter calibration system A filter calibration system uses the reflection characteristics of a tuned filter, such as a YIG-tuned filter (YTF), to establish a correspondence between a control signal applied to the filter and the passband center frequency of the filter. This corresp... | 01/25/2000 |
| 5832413 | Generator protection system and method for phasor estimation and frequency tracking during frequency ramping A method for estimating phasors and tracking the frequency of a signal during frequency ramping is provided. The method uses a variable N-point DFT periodically to compute one or more phasors based on data acquired from one or more sampled signals. The pe... | 11/03/1998 |
| 5832414 | Generator protection system and method of compensating for errors in phasor estimation due to oscillations in discrete Fourier transform A new method of compensating for errors in phasor estimation due to oscillations caused by discrete fourier transforms used to estimate signal frequency is provided. The method uses a variable N-point DFT to compute one or more phasors based on data acqui... | 11/03/1998 |
| 5749047 | Method and apparatus for recognizing a test signal and determining signal transfer characteristics therefrom A method and apparatus for fast response and distortion measurement of a signal transfer device. A computer processor generates a multitone test signal of predetermined duration and stores it in a memory. The test signal is read out, converted to analog f... | 05/05/1998 |
| 5748001 | Method and apparatus for fast response and distortion measurement A method and apparatus for fast response and distortion measurement of a signal transfer device. A computer processor generates a multitone test signal of predetermined duration and stores it in a memory. The test signal is read out, converted to analog f... | 05/05/1998 |
| 5475315 | Method and apparatus for fast response and distortion measurement A method and apparatus for fast response and distortion measurement of a signal transfer device. A computer processor generates a multitone test signal of predetermined duration and stores it in a memory. The test signal is read out, converted to analog f... | 12/12/1995 |
| 5420514 | Swept signal analysis instrument and method The sweep rate limitations that heretofore have constrained the maximum sweep rates of swept analysis instruments are obviated by optimizing filter circuitry and post-processing the IF signal using various techniques to compensate for errors caused by fas... | 05/30/1995 |
| 5420516 | Method and apparatus for fast response and distortion measurement A method and apparatus for fast response and distortion measurement of a signal transfer device. A computer processor generates a multitone test signal of predetermined duration and stores it in a memory. The test signal is read out, converted to analog f... | 05/30/1995 |
| 5175698 | Method and system for transfer function measurement An automatic, multi-use device for measuring the transfer function of any nonlinear continuous network or network component. Transfer functions (also known as input/output reactions) are the main characteristics of all communication and information proces... | 12/29/1992 |
| 4868487 | Frequency response analyser with multiplying digital to analogue converter In apparatus for performing frequency response analysis of a system under test to establish response coefficients at various frequencies, a look up Read Only Memory is sequentially addressed to give a driving signal. The signal received from a system unde... | 09/19/1989 |
| 4860227 | Circuit for measuring characteristics of a device under test A measurement circuit includes two signal sources, one for generating a test input signal to a DUT and the other for generating a sampling signal. Both sources are coupled to one crystal oscillator and one or both sources may be fractional N oscillators. ... | 08/22/1989 |
| 4819179 | Digital slip frequency generator and method for determining the desired slip frequency The output frequency of an electric power generator is kept constant with variable rotor speed by automatic adjustment of the excitation slip frequency. The invention features a digital slip frequency generator which provides sine and cosine waveforms fro... | 04/04/1989 |
| 4638248 | Methods and apparatus for measuring relative gain and phase of voltage input signals versus voltage output signals A system for accurately measuring frequency response (phase and gain) in either a wireless or in a wired mode of operation is described. When used in either mode, a multiplexing method is employed which allows the use of a narrow channel bandwidth, with a... | 01/20/1987 |
| 4607216 | Apparatus for measurement by digital spectrum analyzer A frequency range of measurement is divided into a plurality of regions. For each region a test signal suitable for measurement of the region is generated independently, and the test signal is supplied to a device under test. The output of the device unde... | 08/19/1986 |
| 4511978 | Device for determining a parameter signal for a voltage-fed load A device for determining a load operating parameter signal, such as the flux of a rotary field machine, has an integrating circuit added at the input of the instrument transformer with a transfer function k/(1+s.multidot.k/ωN) that amplifies r... | 04/16/1985 |
| 4354177 | Method and apparatus for calibrating an analog-to-digital converter for a digital-to-analog converter test system A method and apparatus for exciting the analog input of an analog-to-digital converter and examining the output by means of analysis with histograms to determine the amplitude probability distribution of each digital output value. The amplitude probabilit... | 10/12/1982 |
