Did You Know...
...that the inventor of the electric motor was a blacksmith named Thomas Davenport? Described as "a brilliantly unsuccessful inventor", Davenport invented the first rotary electric motor. In 1836 he headed out -- on foot -- from his Vermont home to file a patent application at the Patent Office in Washington, D.C. By the time he got there, he had squandered away his money and couldn't afford the $30 filing fee so he turned around and went home. When he later mailed in his application with money he'd raised, the Patent office was destroyed in a fire. He did finally get credit for his invention on Feb. 5, 1837.
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| Number | Title | Issue Date |
| 8014967 | Low-noise source In one embodiment, a low-noise source includes: a signal source; a variable amplifier adapted to amplify an output signal from the signal source to provide an amplified signal; a feed-forward amplifier adapted to amplify the amplified signal to provide an amplified ... | 09/06/2011 |
| 7945413 | Voltage-sensed system and method for anti-islanding protection of grid-connected inverters A method is provided for preventing islanding of a power source connected to an electric AC grid via an interface. The method senses an output voltage waveform of the interface, controls an output current waveform of the interface to track a reference current wavefo... | 05/17/2011 |
| 7693674 | Low-noise source In one embodiment, a low-noise source includes: a signal source; a variable amplifier adapted to amplify an output signal from the signal source to provide an amplified signal; a feed-forward amplifier adapted to amplify the amplified signal to provide an amplified ... | 04/06/2010 |
| 7421362 | Method for analyzing a drive system A method is for analyzing a drive system, according to which a transfer function of a target system in the drive system is determined by applying noise signals to the drive system. Several noise signals, which cover different frequency ranges, are successively appli... | 09/02/2008 |
| 7362801 | Method for accurate estimation of noise for data modems Noise and signal-to-noise ratio (SNR) estimation are relatively straightforward tasks. However, when SNR is small, systematic errors in measurement may result in over-estimation of SNR, which also occurs during runtime monitoring of SNR. Here, sufficient numbers of ... | 04/22/2008 |
| 7313496 | Test apparatus and test method for testing a device under test A testing apparatus for testing a device under test (DUT) includes a performance board; a main frame for generating a test signal for testing the DUT and determining pass/fail of the DUT based on an output signal output by the DUT; a pin electronics between the main... | 12/25/2007 |
| 7310504 | IF frequency response characterization employing overlapping frequency bands A method and system characterizes an IF response of a receiver under test, such that an effect on the characterization by errors associated with uncertainties in knowledge of an RF stimulus signal used to perform the characterization is reduced. The method includes ... | 12/18/2007 |
| 7268530 | Method to measure the mutual phase relationship of a set of spectral components generated by a signal generator A novel method is described that enables the measurement of the phase of the spectral components generated by an harmonic phase reference generator without using a calibrated sampling oscilloscope. First one uses a vector network analyzer to measure the output refle... | 09/11/2007 |
| 7257497 | Sequential frequency band acquisition apparatus for test and measurement instruments An acquisition apparatus for a test and measurement instrument includes an input to receive an input signal, a digitizer to digitize a selected signal, a bypass path to selectively couple the input to the digitizer, a frequency shift path to frequency shift the inpu... | 08/14/2007 |
| 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 |
| 7249153 | Data compression using Chebyshev transform The present invention is a method, system, and computer program product for implementation of a capable, general purpose compression algorithm that can be engaged “on the fly”. This invention has particular practical application with time-series data, and more p... | 07/24/2007 |
| 7233364 | Apparatus and method for generating coefficient data, apparatus and method for processing information signal using the same, apparatus and method for obtaining coefficient data used therefor, and information providing medium A class code of a subject pixel of an HD signal is obtained from pixel data of a class tap extracted from an SD signal. In a memory bank, coefficient data for a generating equation, including parameters for adjusting image quality, for generating elements of a summa... | 06/19/2007 |
| 7200950 | Process for monitoring measuring device performance The disclosed embodiments relate to calibrating a measuring device by comparing a set of master measurement data against a set of current measurement data. Adjustments are made to the measuring device based on the difference between the current measurement data and ... | 04/10/2007 |
| 7181384 | Method and apparatus for simulating a hybrid system with registered and concurrent nodes A method for performing simulation on a circuit includes simulating registered and concurrent nodes in the circuit. Only concurrent nodes that are associated with a concurrent feedback loop are simulated until outputs of the concurrent nodes that are associated with... | 02/20/2007 |
| 7177772 | System and method for generating and measuring noise parameters A method for measuring noise parameters includes generating a noise signal at a noise source. The noise signal includes a first input signal at a first frequency and a second input signal at a second frequency. The first input signal and the second input signal are ... | 02/13/2007 |
| 7155218 | Method and system for determining spurious emission output by a wireless terminal A method and system for determining spurious emission output by a wireless terminal. A test set may adjust the transmit power setting of the wireless terminal to a first transmit power setting and then to a second transmit power setting. At the first transmit power ... | 12/26/2006 |
| 7126321 | Apparatus and method for measuring transmission delay time of a signal propagation path between printed circuit boards Transmission delay time measurement is performed on a signal propagation path between respective points of two printed circuit boards connected by a coaxial cable. Measurement is made of a frequency-domain response of the cable and a first time-domain response of th... | 10/24/2006 |
| 7127699 | Method for optimizing a number of kernels used in a sum of coherent sources for optical proximity correction in an optical microlithography process A method is provided for optimizing the number of kernels N used in a sum of coherent sources (SOCS) for optical proximity correction in an optical microlithography process, including setting the number of kernels N to a predetermined minimum value Nmin, where a det... | 10/24/2006 |
| 7120485 | Method and system for detection of cardiac arrhythmia There are many different serious cardiac arrhythmias. The present invention uses measurements of RR intervals (interbeat intervals) to detect, in particular but not exclusively, atrial fibrillation of a patient. Atrial fibrilation is a serious ailment in which the h... | 10/10/2006 |
| 7079818 | Programmable mutlistage amplifier and radio applications thereof A programmable multi-stage amplifier includes a 1st programmable amplifier, a 2nd programmable amplifier, and a control module. The 1st and 2nd programmable amplifiers are coupled in series to amplify an input signal. Each... | 07/18/2006 |
| 7072777 | Exposure apparatus anti-vibration apparatus, system identification apparatus and system identification method An exposure apparatus includes a motion control system, the motion control system including a structure, a plurality of actuators to apply forces to the structure, respectively, and a plurality of sensors to sense motion states of the structure, respectively. The ap... | 07/04/2006 |
| 7035743 | Phase noise compensation for phase noise measurements A system and method compensate for phase noise of a spectrum analyzer when measuring the phase noise of an applied signal based on an established model of the phase noise that accommodates a variety of operating states of the spectrum analyzer. Each operating state ... | 04/25/2006 |
| 7035324 | Phase-noise measurement with compensation for phase noise contributed by spectrum analyzer A method and apparatus compensates for phase noise added by a spectrum analyzer from phase noise measurements of a signal under test (SUT) taken by the spectrum analyzer. The method comprises the steps of measuring the phase noise of the SUT, determining the added p... | 04/25/2006 |
| 7015597 | Power regulator for power inverter A power inverter includes a regulator circuit that controls real and reactive power output by the inverter. The regulator measures real and reactive output power by calculating x-phasor components of the inverter's voltage and current output waveforms. Phasor calcul... | 03/21/2006 |
| 7007252 | Method and apparatus for characterizing the propagation of noise through a cell in an integrated circuit One embodiment of the invention provides a system that characterizes cells within an integrated circuit. During operation, the system obtains a number of input noise signals to be applied to the cell. The system then simulates responses of the cell to each of the in... | 02/28/2006 |
| 6988057 | Methods for designing a chamber to reduce noise in a duct Low-frequency duct noise is relatively difficult to deal with by passive methods such as porous duct lining. Reactive methods like expansion chamber are rather bulky, while compact resonators are to narrow-banded. This invention shows that a suitably stetched thin m... | 01/17/2006 |
| 6980915 | Phase noise compensation for spectral measurements A system and method compensate for phase noise of a spectrum analyzer based on an established model of the phase noise that accommodates a variety of operating states of the spectrum analyzer. The model is used to form an array that is applied to extract an output s... | 12/27/2005 |
| 6931341 | Automatic adjusting method for measuring equipment and apparatus using the same An apparatus that automatically adjusts self-noise and can lower the lower limit value of a measurement range by reducing the effects of self-noise on measured values. This apparatus corrects self-noise when amplifying an output signal from a sensor so as to conform... | 08/16/2005 |
| 6859763 | Technique for computing a measure on an ultrasonic signal having application to identify valve defects in operating engines A measurement technique that generates a number value identifying the width of a noisy pulse in an analog signal that has particular application for determining whether a defect exists in a cylinder valve of a locomotive diesel engine. The algorithm samples the anal... | 02/22/2005 |
| 6853940 | Anti-islanding device and method for grid connected inverters using random noise injection A device and method for detecting islanding of a grid connected inverter makes use of an injected white noise as a perturbing force on the output voltage of the inverter. The white noise is injected at least once in every cycle and can be generated at different rate... | 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 |
| 6662132 | Noise analyzing method and apparatus and storage medium A noise analyzing method analyzes a crosstalk noise based on circuit data in which buses having the same signal transmitting direction and buses having opposite signal transmitting directions are distinguished from each other, by analyzing the crosstalk n... | 12/09/2003 |
| 6622117 | EM algorithm for convolutive independent component analysis (CICA) In connection with blind source separation, proposed herein, inter alia, are: expectation-maximization equations to iteratively estimate unmixing filters and source density parameters in the context of convolutive independent component analysis where the ... | 09/16/2003 |
| 6526365 | Low-power/wideband transfer function measurement method and apparatus The invention is a method of measuring transfer functions of a physical system using a wideband excitation signal by exciting the system with a low-power, wide band input signal that has a rich frequency content over a wide band and using a stochastic pro... | 02/25/2003 |
| 6393372 | Automated frequency stepping noise measurement system A noise measurement test system is provided for making phase noise measurements of a unit under test (UUT). The noise measurement test system comprises a variable amplifier, a variable low noise source, a variable phase shifter, a mixer, a variable low no... | 05/21/2002 |
| 6167359 | Method and apparatus for characterizing phase noise and timing jitter in oscillators A nonlinear analysis for characterizing phase noise and timing jitter in oscillators is disclosed. The method and apparatus utilize a nonlinear differential equation to characterize the phase error of a given oscillator. A precise stochastic characterizat... | 12/26/2000 |
| 6112161 | Method, apparatus, and article of manufacture for enhanced intergration of signals A method, apparatus, and article of manufacture for enhanced integration of signals, such as those generated by chromatographs. In one embodiment an approximate baseline used for integration of a signal is improved to reduce error. Alternate embodiments f... | 08/29/2000 |
| 6092027 | Apparatus for detecting and recording a conduction noise, a radiation electromagnetic field noise and a discharge noise A noise detecting and recording apparatus which can be widely used for countermeasures against malfunction of electronic equipment which is caused by noises is provided. The apparatus is provided with a unit for outputting data corresponding to the level ... | 07/18/2000 |
| 6002232 | Robust vibration suppression methods and systems Robust Vibration Suppression methods and systems providing improved robustness range and are effective in single or multiple degree of freedom systems are disclosed. Methods disclosed include providing an output response from a physical system by selectin... | 12/14/1999 |
| 5943637 | Noise analyzing apparatus for analyzing noise of autonomous system by simulation A noise analyzing apparatus includes an input unit for inputting a structure of an autonomous system, parameter values and analysis conditions, a periodic steady-state solution calculating unit for calculating a periodic steady-state solution of the auton... | 08/24/1999 |
