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| Number | Title | Issue Date |
| 7872467 | Miniature RF calibrator utilizing multiple power levels A small light-weight battery operated calibrator device provides a precise sine wave output for use in calibration of test equipment, such as a RF Power Meter or a Spectrum Analyzer. The calibration device includes two power levels, one −40 dBm and one 0 dBm. The ... | 01/18/2011 |
| 7683602 | Miniature RF calibrator utilizing multiple power levels A small light-weight battery operated calibrator device provides a precise sine wave output for use in calibration of test equipment, such as a RF Power Meter or a Spectrum Analyzer. The calibration device includes two power levels, one −40 dBm and one 0 dBm. The ... | 03/23/2010 |
| 7443915 | Method and apparatus for providing out of band communications over structured cabling An out of band communications apparatus includes first and second data lines arranged in a differential pair. The data lines convey high speed data within a first frequency range and out of band data within a second frequency range that differs from the first freque... | 10/28/2008 |
| 7386070 | Hardware assisted adjacent channel leakage ratio measurement A tester module is used to perform an adjacent channel leakage ratio measurement. The tester module includes a translation block, a first filter, a re-sampler, a memory, a router, a second filter and a power detector. The translation block translates a received inte... | 06/10/2008 |
| 7342393 | Multimeter with filtered measurement mode A multimeter with a filtered measurement mode. By pressing a single button or key, a low-pass filter is switched into the signal path to filter voltage spikes, noise, and switching transients from pulse-width modulated pulses, or lower frequency sinusoidal signals w... | 03/11/2008 |
| 7222035 | Method and apparatus for determining changing signal frequency A method and apparatus for estimating the changing frequency of a signal received by a satellite receiver from, illustratively, positioning system satellites is disclosed that enables a more accurate measurement of the change in frequency of that signal due to movem... | 05/22/2007 |
| 7177756 | Method, control appliance, and computer program for detecting defective pressure sensors in an internal combustion engine A method, a control unit, and a computer program for detecting a defective intake-manifold pressure sensor and/or a defective ambient-pressure sensor in an internal combustion engine having a variable valve timing are provided. The desired detection is carried out e... | 02/13/2007 |
| 7154277 | Method and apparatus for detecting faults in AC to AC, or DC to AC power conversion equipments when the equipment is in a high impedance mode A system for use in ac to ac or dc to ac power conversion equipment to detect faults in an inverter when the inverter is in a high impedance mode. The system detects ground faults or cross wiring conditions by converting the inverter outputs to digital signals and e... | 12/26/2006 |
| 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 |
| 7091725 | Fast, high-resolution, indirect measurement of a physical value A measurement method or system for measuring a physical value comprises, during a same clock cycle, forming an input signal, a reference signal and an offset signal, the input signal including a parasitic value and a useful measurement value. A relationship between ... | 08/15/2006 |
| 7085592 | Wireless transmission evaluation system and method A signal testing system and method for evaluating wireless communication signals transmitted between a base station and a communication site is provided. The signal testing system comprises an antenna located at the communication site for communicating the wireless ... | 08/01/2006 |
| 6906663 | E-field monitor for pulsed signals A system is provided for substantially continuously monitoring an electromagnetic intensity of short pulses of electromagnetic fields (E-fields) having frequencies within a broad frequency range. The system includes at least one antenna capable of sensing one or mor... | 06/14/2005 |
| 6904269 | Signal type identification A method of identifying a signal type uses parameters of the signal as a basis for automatic identification. A signal of interest is selected from a display of a spectral waveform for a specified frequency. An occupied bandwidth for the signal of interest is estimat... | 06/07/2005 |
| 6784654 | Signal reproduction block In a signal reproduction block of a DVD reproduction apparatus, an output signal line for outputting a characteristic information signal representing a characteristic of a filter incorporated in the signal reproduction block to the outside is additionally provided o... | 08/31/2004 |
| 6630820 | Method and apparatus for measuring the instantaneous frequency of FM signals A method and an apparatus for measuring the instantaneous frequency of FM modulated signals, includes sampling, instantaneous frequency computing, and lowpass filtering. FM modulated signal are sampled at prescribed intervals to provide digitized FM signa... | 10/07/2003 |
| 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 |
| 6597160 | Method for measuring fundamental frequency component of fault current or voltage signal A method for measuring the fundamental frequency component of a fault current or voltage, including measuring a fault current or voltage signal, which includes a DC-offset, a characteristic frequency component, a fundamental frequency component, and harmo... | 07/22/2003 |
| 6493024 | Signal monitoring apparatus A digital video signal monitoring apparatus comprises means (2,4,6) for receiving a digital video signal and extracting therefrom a plurality of digital signals, each of which comprises a plurality of successive digital sample values. The apparatus furthe... | 12/10/2002 |
| 6483286 | Method and apparatus for measuring the instantaneous frequency of FM signals A method and an apparatus for measuring the instantaneous frequency of FM modulated signals, includes sampling, instantaneous frequency computing, and lowpass filtering. FM modulated signal are sampled at prescribed intervals to provide digitized FM signa... | 11/19/2002 |
| 6466001 | Method and apparatus for controlling the molten metal level in a mold in continuous casting A method and apparatus for controlling the level of molten metal in a mold for continuous casting by using a molten metal level control system incorporating a molten metal level controller in the control loop thereof, which comprises damping selectively t... | 10/15/2002 |
| 6356067 | Wide band signal analyzer with wide band and narrow band signal processors A wide band signal analyzer includes a frequency converter for converting a signal under test to an intermediate frequency signal. A narrow band signal processor receives the intermediate frequency signal and produces a first digital signal representing a... | 03/12/2002 |
| 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 phase adjuster 32 receives the quadrature signals and adjusts ... | 01/22/2002 |
| 6329807 | Device for the recognition of a defective signal The device for detecting an erroneous signal characteristic of a load on an internal combustion engine that includes first and second differentiators (10,16) with delay devices that generate corresponding output signals (S11, S22) from respective load sig... | 12/11/2001 |
| 6313620 | Detector system for identifying the frequency of a received signal useful in a channelized receiver A method, and apparatus for accomplishing the method, for determining the frequency of an RF signal that operates by sequentially applying a received RF signal to sequentially selected individual filters having predetermined frequency pass bands and compa... | 11/06/2001 |
| 6292002 | Crystal resonant frequency sensor A method and apparatus for measuring the frequency of a desired resonant mode of a crystal arrangement, or other two-port device, during an automated operation. The crystal arrangement, or other two-port device, is placed into a test circuit and subjected... | 09/18/2001 |
| 6157183 | Two port handheld vector network analyzer with frequency monitor mode A two port handheld VNA enabling both reflection and transmission measurements to be made over a range of 25 MHz to 3.3 GHz frequency range. The handheld VNA includes a tracking synthesizer which generates a LO signal without a direct connection to a refe... | 12/05/2000 |
| 6115675 | Double interpolation anti-skew compensation of sampled analog data points in a protective relay A protective relay system comprises current and voltage transducers 10, filters 12, and a multiplexor 14, the latter outputting an interleaved stream of analog phase current and voltage signal samples, as well as neutral current samples. The analog multip... | 09/05/2000 |
| 6046594 | Method and apparatus for monitoring parameters of an RF powered load in the presence of harmonics A method and apparatus for measuring electrical characteristics (e.g. current, voltage, phase, etc.) between a power source and a load at a set of harmonic frequencies to determine information about the load (e.g., load impedance, power dissipation, etc).... | 04/04/2000 |
| 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 |
| 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 |
| 5801525 | Frequency discriminating power sensor A power sensor that enables determination of the frequency of a microwave signal comprises a signal input that receives the microwave signal at a particular frequency, at least one sensor that produces a first and second output corresponding to the power ... | 09/01/1998 |
| 5508623 | Apparatus and method to identify harmonic producing loads An apparatus and method to identify a harmonic producing load on a utility electrical network is described. The apparatus is connected to the utility electrical network at a location adjacent to a load. The apparatus includes a network voltage node to rec... | 04/16/1996 |
| 5436556 | Signal detector and method for detecting signals having selected frequency characteristics A signal detector and signal detection methodology is provided to monitor oscillatory signals to produce detector output in response to the presence of target signals having a frequency within a selected frequency range. The detector has input processing ... | 07/25/1995 |
| 5038097 | Spectrum analyzer A spectrum analyzer includes an arithmetic operation unit for calculating an interpolated value of two sample levels of the signals passed through two band-pass filters having center frequencies near to each other. The interpolated value levels calculated... | 08/06/1991 |
| 5038096 | Spectrum analyzer circuit for pulsed input signals A spectrum analyzer for measuring the frequency spectrum of a pulsed input signal includes a synthesized local oscillator for providing an oscillator signal. The local oscillator is responsive to a digital control input signal to sweep the frequency of th... | 08/06/1991 |
| 4914380 | Signal receiving arrangement A signal receiving arrangement comprising first and second groups (14, 16) of frequency down-converting stages (18 to 24 and 26 to 34), each stage including a mixer (40) and a local oscillator (42) for frequency down-converting a signal applied to the sta... | 04/03/1990 |
| 4899289 | Apparatus for and method of processing signals in a composite waveform including noise and a periodic component The occurrence and frequency of a periodic component embedded in a composite waveform including noise is detected by real time calculating the autocorrelation function of the waveform and deducing the frequency of the periodic component from the value of ... | 02/06/1990 |
| 4864221 | Filter, phase-measuring device and method for application of said filter The present invention concerns mainly a filter, a phase-measuring device and a method to apply said filter. The main object of the invention is a phase-measuring device. The use of adapted filters (140) enables the increasing of the signal/noise ratio of ... | 09/05/1989 |
| 4859933 | Narrowband signal recognition for EMI measurement A test method and apparatus to aid a site operator in discriminating between signals measured at different times, as well as enabling a level of automation which is appropriate using state-of-the-art instrumentation for performing EMI measurements, such a... | 08/22/1989 |
| 4859934 | Apparatus for measuring the frequency of microwave signals A microwave frequency detection receiver utilizing a prescaler comprised of one or a plurality of cascaded analog frequency dividers for down-converting received microwave signals to a predetermined compressed radio frequency bandwidth, connected to a com... | 08/22/1989 |
