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An armor with rollers is provided that enables a user to move in all positions by rolling on a hard and smooth surface while constantly varying his bearing points on the ground.
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| Number | Title | Issue Date |
| 7313492 | Method and device for increasing the dynamic range and measuring accuracy of a measuring device for spectrum and/or network analysis A method and a device for increasing the dynamic range and measuring accuracy of a measuring device for spectrum and/or network analysis images a high-frequency electronic signal within a frequency range into at least two spectra through a first frequency translatio... | 12/25/2007 |
| 7302017 | System and method for adaptive matched filter signal parameter measurement A robust and flexible system for signal parameter measurements in the field of signal processing dynamically uses signal parameters from previous signal detections and parametric priorities to adaptively control and process the signal in an efficient and reliable ma... | 11/27/2007 |
| 7289591 | Counter circuit for controlling off-chip driver Disclosed herein is a counter circuit for controlling an off-chip driver, wherein hexadecimal number counting is performed using a N (N is a natural number) number of T-flip-flops. The plurality of the T-flip-flops performs a hexadecimal number counting operation to... | 10/30/2007 |
| 7285948 | Method and apparatus providing single cable bi-directional triggering between instruments System and apparatus enabling the use of a single cable to communicate triggering information between each of a plurality of signal acquisition devices and, illustratively, an external trigger control unit. A combined tripper signal is produced only when each trippe... | 10/23/2007 |
| 7176670 | Method and apparatus for zero-mixing spectrum analysis with Hilbert transform An apparatus for analyzing a spectrum of an input signal (χ(t)) having at least one line with a center frequency ({circumflex over (ω)}x) at the center of the line includes: a mixer for zero-mixing the input signal (χ(t)) to produce a base band signal ... | 02/13/2007 |
| 7123000 | Adjacent channel leakage power ratio measuring apparatus, channel power measuring apparatus method, program, and recording medium with recording the program The frequency of an adjacent channel signal is reduced by a down converter (12), wherein the signal (adjacent channel signal) in a predetermined band centered around the adjacent channel frequency passes through a band-pass filter (22). At this time, a... | 10/17/2006 |
| 7124043 | Spectrum analyzer with phase noise compensation A spectrum analyzer with a compensation circuitry for prevention of measurement accuracy deterioration due to local oscillators phase noise. ... | 10/17/2006 |
| 7116092 | Integrated spectrum analyzer circuits and methods for providing on-chip diagnostics Spectrum analyzer circuits and methods are provided which implement “zero-IF” (direct conversion) or “near-zero IF” (or very low IF) architectures that enable implementation of integrated (on-chip) spectrum analyzers for measuring the frequency spectrum of i... | 10/03/2006 |
| 7107165 | Markers used in the calculation and display of band functions A user interface for an electronic instrument includes a display that displays a signal and a band marker. The band marker demarks a bandwidth of the signal by marking both a start frequency of the bandwidth and a stop frequency of the bandwidth. The electronic inst... | 09/12/2006 |
| 7099016 | Method and apparatus for zero-mixing spectrum analysis An apparatus (1) for analyzing a spectrum of an input signal (x(t)) having at least one line with a center frequency (@s) comprises a mixer (2) for zero-mixing the input signal (x(t)) to produce a base band signal (z(t)) by sweeping a local ... | 08/29/2006 |
| 7028070 | High speed filter An electronic filter operates as a correlator that provides a discrete approximation of an analog signal. The analog to digital conversion is integrated directly approximation calculation. An array of sample and hold circuits or single bit comparators provide output... | 04/11/2006 |
| 7020096 | Physical quantity display device for displaying physical quantity of multiple signals, method and recording medium A display device, for displaying values of a physical quantity of multiple channels with different spreading code lengths, includes a channel storage for storing therein both the channels to be displayed and their respective spreading code lengths; a calculating uni... | 03/28/2006 |
| 7019839 | Optical analyzer and method for measuring spectral amplitude and phase of input optical signals using heterodyne architecture An optical analyzer and method for measuring optical properties of optical signals utilizes a heterodyne architecture to measure spectral amplitude and phase of a periodically modulated input optical signal, such as an optical signal from a periodically modulated di... | 03/28/2006 |
| 6996068 | Audio testing in a packet switched network An audio test system for analyzing and quantifying audio data losses during network-based telephony sessions between communication devices such as telephony-enabled computers and Internet telephones. A transmit device converts an input audio signal to a stream of da... | 02/07/2006 |
| 6915223 | Waveform display equipment and waveform displaying method The object of the present invention is to realize waveform display equipment and to achieve a waveform displaying method, in which a plurality of waveforms can be easily observed and measured. The present invention improves conventional waveform display equipment in... | 07/05/2005 |
| 6904381 | Testing of a frequency converter device A user interface is presented for a tester that tests a frequency converter having an input port, an output port and a local oscillator port. In a first area, a user can specify frequency for an input signal to be placed on the input port. In a second area, the user... | 06/07/2005 |
| 6891904 | Modulation signal analysis apparatus An analysis operation section uses a digital signal converted by an A/D converter, and performs frequency analysis for a modulation signal and modulation analysis for the modulation signal selected by a signal selection circuit in order to modulate/analyze a digital... | 05/10/2005 |
| 6763323 | Resolution filter for a spectrum analyzer A spectrum analyzer comprises a mixer, which mixes complex conjugate input signal v*(t) into a base band signal x(t) and a resolution filter, which filters the base band signal for narrow band. In accordance with two aspects of the invention, the resolution filter h... | 07/13/2004 |
| 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 signal, the phase change including a quadratic portion. For... | 03/02/2004 |
| 6631341 | Signal analyzing apparatus In an RBW filter, a bandwidth is set so as to selectively pass a frequency component of only a desired signal bandwidth of the measured signals that have been frequency converted into a normalized intermediate frequency signal. A waveform detector detects... | 10/07/2003 |
| 6504354 | Signal analysis apparatus having YTO yttrium-iron garnet tuned oscillator A sweep controller supplies a current to a YTO(YIG-Yttrium-Iron-Garnet Tuned Oscillator) from a current drive circuit in such a manner that frequencies corresponding to a first range in an oscillation frequency of the YTO designated as a desired frequency... | 01/07/2003 |
| 6479977 | Automatic electronic load pull circuit for oscillators A load pull circuit with a monitoring port which provides a constant VSWR throughout a phase variation in excess of 360°. The fundamental circuit comprises a fixed resistor of fifty ohms placed in series with an external fifty ohm load monitoring port re... | 11/12/2002 |
| 6392397 | Method and apparatus for spectrum analysis by creating and manipulating candidate spectra A spectrum analyser that includes means (8) for converting, at each of a series of frequency settings, a received radio frequency signal into an intermediate frequency signal, each intermediate frequency signal being derivable from more than one nominal r... | 05/21/2002 |
| 6377900 | Measuring system for transfer function matrix of a system to be controlled in multi-degree of freedom vibration control A measuring system for measuring a transfer function matrix of a system to be controlled by applying sine-wave excitations to a test object simultaneously by multiple number of vibrators. In the measuring system, when sine-wave signals for driving multipl... | 04/23/2002 |
| 6335615 | Mode selection methods for signal analyzers having alternative swept and fast fourier transform modes of operation A mode selection method for signal analyzers having alternative swept and Fast Fourier Transform (FFT) modes of operation enables tradeoffs between measurement speed and dynamic range to be optimized in selecting between the alternative operating modes. T... | 01/01/2002 |
| 6316928 | Spectrum analyzer A spectrum analyzer that incorporates a YTO (YIG tuned oscillator) as a sweep frequency local oscillator and a YTF (YIG tuned filter) as a frequency pre-selector for an incoming signal and improves a C/N (carrier to noise) ratio with low cost. The spectru... | 11/13/2001 |
| 6275020 | Frequency analysis method and sweep type spectrum analyzer There are provided a frequency analysis method permitting a frequency analysis to be performed at a high rate and a sweep type spectrum analyzer using such frequency analysis method. In the case of multiplying a signal to be measured by a main swept frequ... | 08/14/2001 |
| 6233288 | Spectrum analyzer A spectrum analyzer having an improved local oscillator for use in a digital step sweep is capable of minimizing a dynamic spurious response which is inverse proportional to a unit step time in the step sweep. The local oscillator includes a random clock ... | 05/15/2001 |
| 6229316 | Measuring method by spectrum analyzer A spectrum analyzer in which automatic setting of parameters such as band width is done by the analyzer without manual operator input and noise measurements are determined and displayed to the operator. This is accomplished by an input signal being suppli... | 05/08/2001 |
| 6191571 | Measuring method by spectrum analyzer A measuring device and method use a spectrum analyzer. The spectrum analyzer comprises a display screen controlled by a processor on which a spectrum of an input signal is displayed in a frequency region on a half portion of the display screen and a noise... | 02/20/2001 |
| 6166533 | Frequency spectrum analyzer with high C/N ratio A frequency spectrum analyzer having an improved carrier to noise ration for analyzing frequency spectrum of an input signal. The spectrum analyzer includes a first frequency converter formed of a first frequency mixer, a first IF (intermediate frequency)... | 12/26/2000 |
| 6060878 | Spectrum analyzer A spectrum analyzer measures a time difference between two or more signals with different carrier frequencies or a time delay between two or more signals with the same carrier frequency. The spectrum analyzer includes at least two measurement channels, ea... | 05/09/2000 |
| 6018246 | Network analyzer measurement method for high dynamic range devices A measurement method adjusts the IF bandwidth of a network analyzer to increase measurement speed for high dynamic range devices. According to the first preferred embodiment of the present invention, the bandwidth of the IF filter is adjusted for each cor... | 01/25/2000 |
| 5977779 | Handheld vecor network analyzer (VNA) operating at a high frequency by mixing LO and RF signals having offset odd harmonics A vector network analyzer (VNA) has a first harmonic generator multiplying an RF signal by an odd number M1 to produce incident and reflected test signals received at inputs of mixers providing IF signals. A second harmonic generator multiplies an LO sign... | 11/02/1999 |
| 5952834 | Low noise signal synthesizer and phase noise measurement system A phase noise measurement system including a low noise programmable synthesizer and a receiver/down converter is provided. The low noise synthesizer provides L-Band Signals which can selectively exhibit low noise close-in or low noise far out. The receive... | 09/14/1999 |
| 5869959 | Spectrum analyzer A spectrum analyzer includes a synchronizing signal input terminal (27A) and a sweep control signal generator (32) inserted between the synchronizing signal input terminal (27A) and a ramp address generator (23). In the case of making a frequency analysis... | 02/09/1999 |
| 5847559 | Spectrum Analyzer An improved local oscillator for use in a digital step sweep is capable of minimizing dynamic spurious which is an inverse of the unit step time Tstep. The local oscillator includes a random clock delay 12 which provides a random clock 12r... | 12/08/1998 |
| 5818215 | Direct digital synthesizer driven phase lock loop spectrum analyzer A spectrum analyzer converts frequencies of an input signal using a local signal from a local signal generator, detects the frequency converted outputs, and sweeps the frequencies of said local signal generated by said local signal generator, to obtain a ... | 10/06/1998 |
| 5777464 | Spectrum analyzer The object of a spectrum analyzer of present invention is to increase a frequency stability and SPAN probability. A voltage control oscillator is rendered to a locked state based on a frequency as a reference frequency output from a direct digital synthes... | 07/07/1998 |
| 5736845 | Spectrum analyzer having image frequency eliminating device A frequency spectrum analyzer includes a display for showing frequency spectrums in a frequency domain versus power level form, a local oscillator which is driven by a sweep signal to repeatedly cause a frequency sweep of a local signal wherein the local ... | 04/07/1998 |
