| Patents for G01R 23 - Arrangements for measuring frequencies; Arrangements for analysing frequency spectra (7,503) |
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| 11/03/2009 | CA2452378C System for estimating the frequency of the power signal on a power transmission line |
| 10/29/2009 | WO2009130372A1 Method, apparatus and computer program for estimating spectrum using a folding adc |
| 10/29/2009 | US20090271133 Clock jitter measurement circuit and integrated circuit having the same |
| 10/28/2009 | EP2112753A1 Method and device for determining the rotor rotation speed of an asynchronous electric induction motor |
| 10/28/2009 | CN101566649A Harmonic detection method in a power system |
| 10/28/2009 | CN101566641A Power system transmission line parameter synchronic measurement and recording device |
| 10/28/2009 | CN100554917C Method for acquiring system eigenfunction and signal feature value |
| 10/22/2009 | WO2009127843A1 Terahertz signal generator |
| 10/22/2009 | WO2009126999A1 Radio frequency transponder |
| 10/22/2009 | US20090261809 Testing device including low-pass filter with automatically switching function |
| 10/22/2009 | US20090261808 Method and apparatus to measure differential phase and frequency modulation distortions for audio equipment |
| 10/21/2009 | CN101561465A Disturbance source locating method based on secondary modulation of round-trip wave |
| 10/21/2009 | CN101561464A Broad-band high-resolution real-time fast Fourier transform digital spectrometer |
| 10/21/2009 | CN101561463A Power-on detection circuit for detecting minimum operational frequency |
| 10/21/2009 | CN101561454A Power quality analyzer |
| 10/20/2009 | CA2353028C Selectable band-pass filtering apparatus and method |
| 10/15/2009 | US20090259423 Power supply apparatus for operation and resonant frequency searching method |
| 10/15/2009 | DE10246700B4 Meßvorrichtung, insbesondere vektorieller Netzwerkanalysator, mit getrennten Oszillatoren Measuring device, in particular vectorial network analyzer, with separate oscillators |
| 10/15/2009 | DE10165055B4 Korrelationsfunktions-Messverfahren und -Vorrichtung Correlation function measuring method and apparatus |
| 10/14/2009 | EP2027476B1 System for extraction and analysis of radio signals |
| 10/14/2009 | CN201328068Y Mineral flame-proof type transducer electromagnetic compatibility system |
| 10/14/2009 | CN101558318A Signal analyzers and frequency domain data production methods |
| 10/14/2009 | CN101556299A Method for detecting micro deformation of transformer winding |
| 10/13/2009 | US7601126 Lameness evaluation systems and methods |
| 10/08/2009 | WO2009124073A2 Acquiring phasors outside the frequency tracking range for power protective relays |
| 10/08/2009 | US20090254300 System and method for determining position or speed of a commutated DC motor with error correction |
| 10/08/2009 | US20090254292 Frequency resolution using compression |
| 10/08/2009 | US20090254291 Acquiring Phasors Outside the Frequency Tracking Range for Power Protective Relays |
| 10/08/2009 | US20090252342 Method and apparatus to measure differential phase and frequency modulation distortions for audio equipment |
| 10/08/2009 | US20090251223 Techniques for characterizing performance of transistors in integrated circuit devices |
| 10/08/2009 | US20090251129 Frequency measurement device and measurement method |
| 10/08/2009 | DE102005012977B4 Verfahren und System zur Rauschmessung mit den kombinierbaren Unterverfahren Messen, Identifizieren und Beseitigen von sinusförmigen Störsignalen in einem Rauschsignal Method and system for noise measurement with the combined sub-process measuring, identification and elimination of sinusoidal interference signals in a noise signal |
| 10/08/2009 | DE102004042069B4 Phasenrauschkompensation für Spektralmessungen Phase noise compensation for spectral measurements |
| 10/08/2009 | CA2719513A1 Acquiring phasors outside the frequency tracking range for power protective relays |
| 10/06/2009 | US7599809 Processor capable of alerting its life expectancy and method thereof |
| 10/06/2009 | US7598723 Method and apparatus for detecting resonance in electrostatically driven elements |
| 10/06/2009 | CA2319169C Method for estimating the frequency of a time signal |
| 10/04/2009 | WO2009122594A1 Method of detecting fundamental wave beat component, sampling device for measured signal using the same, and waveform observation system |
| 10/04/2009 | CA2653572A1 Fundamental wave beat component detecting method and measuring target signal sampling apparatus and waveform observation system using the same |
| 09/30/2009 | EP2105749A1 Improved video bandwidth resolution in dft-based spectrum analysis |
| 09/30/2009 | CN201319044Y Self-adaptive frequency measurer |
| 09/30/2009 | CN100545661C Frequency spectrum analyzer for surplus photocarrier |
| 09/29/2009 | US7596495 Current noise spectrum estimation method and apparatus with correlation between previous noise and current noise signal |
| 09/29/2009 | US7596462 Systems, methods, and devices for generating variable-frequency pulses |
| 09/24/2009 | US20090240452 System and method for wireless and dynamic intra-process measurement of integrated circuit parameters |
| 09/24/2009 | US20090237070 Method of instantaneously determining or estimating the frequency or amplitude of an input signal |
| 09/24/2009 | US20090237069 Method and apparatus for determining a response of a dut to a desired large signal, and for determining input tones required to produce a desired output |
| 09/23/2009 | EP2103948A1 Signal quality measuring device, spectrum measuring circuit, and program |
| 09/23/2009 | CN101539602A Full-digital real-time noise measurement and analysis method and system thereof |
| 09/23/2009 | CN101539597A Multi-target method for distinguishing radiation noises having same frequency band |
| 09/23/2009 | CN101539596A Method for monitoring electric network frequency |
| 09/23/2009 | CN100543481C Method of detecting RF power delivered to a load and complex impedance of the load |
| 09/22/2009 | US7592795 Measurement of distortion in an amplifier |
| 09/16/2009 | CN101533045A Spectral analysis method for neutron pulse sequences |
| 09/11/2009 | WO2009110172A1 Time digital converter, digital pll frequency synthesizer, transmitter-receiver, and receiver |
| 09/10/2009 | US20090224773 Communicating With an Implanted Wireless Sensor |
| 09/10/2009 | DE102004050912B4 Verfahren und Vorrichtung zur Erhöhung des Dynamikbereichs und der Meßgenauigkeit einer Meßeinrichtung zur Spektrum- und/oder Netzwerkanalyse A method and apparatus for increasing the dynamic range and the measurement accuracy of a measuring device for spectrum and / or network analysis |
| 09/09/2009 | EP2097757A2 Method and device for triggering a recording of a measuring signal |
| 09/09/2009 | EP1450170B9 Phase detector capable of detecting an accumulated value of phase displacement at a high speed and frequency stability measurement apparatus for arbitrary nominal frequency using the same |
| 09/09/2009 | EP1181544B1 High frequency measuring circuit with inherent noise reduction for resonating chemical sensors |
| 09/09/2009 | CN201307138Y Harmonic current analysis meter for transformer |
| 09/09/2009 | CN101526566A Interference signal source monitoring method and device thereof |
| 09/09/2009 | CN101526565A Full-power electric energy measurement instrument |
| 09/03/2009 | US20090219100 Voltage-controlled oscillator gain calibration for two-point modulation in a phase-locked loop |
| 09/03/2009 | DE102009000477A1 Frequenzeigenschaftsmessvorrichtung Frequency characteristic measuring apparatus |
| 09/02/2009 | EP2096451A1 Signal analyzer and its data generation method |
| 09/02/2009 | EP2095138A1 Method and device for the determination of a statistical measurement value |
| 09/02/2009 | CN101520500A System and method for executing external calibration |
| 08/26/2009 | EP1889279B1 System and method for analyzing power flow in semiconductor plasma generation systems |
| 08/26/2009 | CN201298058Y High integration density programmed filter analysis device based on field programmable gate array (FPGA) |
| 08/26/2009 | CN101515015A Power quality monitoring and recording device of power system |
| 08/25/2009 | US7579844 Rotor blade system for rotor and rotor case inspection |
| 08/20/2009 | US20090206842 Method and apparatus for determining whether a cooling device in a computer system is responsive to control signals |
| 08/19/2009 | EP2091155A1 Phase-locked loop system and method |
| 08/19/2009 | EP2090138A1 Method of determining the harmonic and anharmonic portions of a response signal of a device |
| 08/19/2009 | CN201293807Y Test system for antenna resonance frequency |
| 08/19/2009 | CN101509942A Ultrasonic transducer frequency response characteristic detecting method |
| 08/19/2009 | CN100529693C Apparatus and a method for pulse detection and characterization |
| 08/13/2009 | DE102008008293A1 Method for parameter estimation for radar system for environment detection, involves radiating transmitting power by transmitting units, and receiving units are provided for directed reception of transmitting power reflected to objects |
| 08/12/2009 | CN101504428A Electronic measurement method and multifunctional electronic measuring instrument |
| 08/11/2009 | US7574313 Information signal processing by modification in the spectral/modulation spectral range representation |
| 08/11/2009 | US7574005 Howling frequency component emphasis method and apparatus |
| 08/06/2009 | US20090198462 Method, system and analog stimulus-response unit for determining real and imaginary components of an AC response received from a device under test |
| 08/06/2009 | US20090195322 Crystal oscillator frequency calibration |
| 08/06/2009 | US20090195239 Frequency characteristic measuring apparatus |
| 08/05/2009 | CN201285412Y Network type voltage monitoring system |
| 08/05/2009 | CN101501507A Apparatus for measuring distortion power quality index and method of operating the apparatus |
| 08/05/2009 | CN101501506A Device and method for measuring the frequency of a signal coded modulated carrier signal |
| 08/05/2009 | CN101501476A Passive intermodulation distortion measuring method and system |
| 08/05/2009 | CN100523833C Frequency stability measuring apparatus |
| 08/04/2009 | US7570043 Switches bidirectionally connecting external lead to PLL voltage tune line |
| 07/30/2009 | US20090192742 Procedure for increasing spectrum accuracy |
| 07/30/2009 | US20090192741 Method for measuring field dynamics |
| 07/30/2009 | US20090189595 Circuit for detecting the duty cycle of clock signals |
| 07/30/2009 | US20090189594 Detection and monitoring of partial discharge of a power line |
| 07/30/2009 | DE102007040207A1 Method for Fourier analysis, involves transforming input signal into output signals by finite impulse response filters with transmission functions |
| 07/29/2009 | CN100520419C Improved frequency determination |
| 07/28/2009 | US7567073 Interface circuit and memory controller |
| 07/23/2009 | WO2009093316A1 Method of detecting repetitive frequency of measured signal, sampling apparatus using the same, and waveform observation system |
| 07/23/2009 | WO2009090801A1 Frequency detection device, frequency detection method, circuit control device, circuit control method, delay circuit control method, and delay circuit system |