Patents for G01R 23 - Arrangements for measuring frequencies; Arrangements for analysing frequency spectra (7,503) |
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04/27/2010 | US7705609 Phase frequency distortion measurement system |
04/27/2010 | US7705582 Broadband micro-machined thermal power sensor |
04/27/2010 | US7705581 Electronic device and method for on chip jitter measurement |
04/22/2010 | WO2010043439A1 Device and method for inspecting a frequency-modulated pulse generator |
04/22/2010 | US20100097152 Tunable filter with gain control circuit |
04/22/2010 | DE102008042847A1 Vorrichtung und Verfahren zur Überprüfung eines frequenzmodulierten Taktgebers Apparatus and method for checking a frequency modulated clock |
04/22/2010 | DE102007054306B4 Verfahren zum Analysieren von Wechselspannungssignalen A method of analyzing AC voltage signals |
04/21/2010 | CN101221201B Method for measuring fundamental frequency |
04/20/2010 | US7702305 Use of a preselection filter bank and switched local oscillator counter in an instrumentation receiver |
04/20/2010 | US7701194 Methods and system for detecting DC output levels in an audio system |
04/20/2010 | US7701090 Active filter |
04/15/2010 | US20100094577 Signal quality measurement device, spectrum measurement circuit, and program |
04/14/2010 | EP2174148A1 Analog to digital conversion system |
04/14/2010 | EP2173242A1 Method and apparatus for measuring breathing rate |
04/14/2010 | CN201438199U Power quality on-line monitoring device |
04/14/2010 | CN201438012U Air conditioner |
04/14/2010 | CN101694508A Motor rotor classical failure diagnosis method based on low subharmonic shaft voltage signals |
04/14/2010 | CN101251573B Automatic testing method for mixer third order inter-modulation distortion of radio-frequency tuner chip |
04/14/2010 | CN101132175B Selection circuit and configuration method thereof |
04/14/2010 | CN101060684B Reverse interference positioning system, wireless signal acquiring entity and device |
04/14/2010 | CN101047366B Verification and construction method and system of digital filter |
04/13/2010 | US7698080 Methods and systems for determining sample identity information are disclosed |
04/13/2010 | US7696761 Spectrum analyzing method, distortion detector and distortion compensation amplifying device |
04/13/2010 | US7696741 System and method for adaptively determining the transition rate of a quantized signal |
04/08/2010 | WO2010039680A1 Method for transitioning from wide band to narrow band radios |
04/08/2010 | US20100088049 Apparatus and method for measuring active and reactive powers |
04/08/2010 | US20100088048 Method And Device To Predict A State Of A Power System In The Time Domain |
04/08/2010 | US20100085035 Method and apparatus for determining AC voltage waveform anomalies |
04/08/2010 | DE112008001376T5 Messgerät und Programm Instrument and program |
04/08/2010 | DE102008060385A1 Method for determining frequency response of harmonics contained in response signal of e.g. amplifier circuit, involves producing frequency response of harmonics contained in transfer function by Fourier-transformation of signal sections |
04/07/2010 | EP2172785A1 Device and method for measuring frequency in an automation module |
04/07/2010 | EP2171486A2 Apparatus and methods of defining spectral regions of interest for signal analysis |
04/07/2010 | EP2171485A1 Spectrum sensing function for cognitive radio applications |
04/07/2010 | CN101692108A Improved video bandwidth resolution in dft-based spectrum analysis |
04/07/2010 | CN101692107A Method for producing high-speed frequency measurement chip |
04/07/2010 | CN101692106A Time frequency tester |
04/07/2010 | CN101692104A Power quality and synchronized phasor monitoring device for power system |
04/06/2010 | US7692501 Phase/frequency detector and charge pump architecture for referenceless clock and data recovery (CDR) applications |
04/06/2010 | US7692500 Apparatus and methods for mixed analog-digital frequency synthesizing and modulation |
04/06/2010 | US7692419 Method and apparatus for enhanced frequency measurement |
04/01/2010 | WO2010035646A1 Frequency characteristic measurement device |
04/01/2010 | DE102009041663A1 Gerät und Verfahren zur Analyse eines periodischen Signals Apparatus and method for analysis of a periodic signal |
04/01/2010 | DE102005008734B4 Verfahren und System zur Detektion und/oder Beseitigung von sinusförmigen Störsignalen in einem Rauschsignal Method and system for detecting and / or removal of sinusoidal interference signals in a noise signal |
03/31/2010 | CN201434889Y Single-phase power factor transmitter |
03/31/2010 | CN101685125A Method of testing isolation between wire cables by adopting harmonic waves |
03/31/2010 | CN101684977A Device capable of displaying compressor frequency and environmental temperature |
03/30/2010 | US7689275 Method and apparatus for determining an EMG signal |
03/30/2010 | US7688151 Aging compensation method and control module for an oscillator circuit device |
03/30/2010 | US7688059 Filter characteristic adjusting apparatus and filter characteristic adjusting method |
03/30/2010 | US7688058 Integrated spectrum analyzer circuits and methods for providing on-chip diagnostics |
03/25/2010 | US20100072978 Synchrophasor measuring device and inter-bus-line phase angle difference measurement unit using the same |
03/24/2010 | CN201429682Y Alternating-current power supply tester |
03/24/2010 | CN201429652Y Microcomputer type frequency analyzing device |
03/24/2010 | CN201429651Y Wireless intelligent harmonic monitoring system |
03/24/2010 | CN201429650Y Harmonic analyzer based on embedded power system |
03/24/2010 | CN201428102Y Vibration road roller speed-frequency managing system |
03/24/2010 | CN101680919A Determination of sine wave period |
03/23/2010 | US7683631 Inverse characteristic measuring apparatus, distortion compensation apparatus, method, program, and recording medium |
03/23/2010 | US7682311 Phase unwrapped velocity display for ultrasound medical imaging |
03/18/2010 | US20100070227 System and method for identifying appliances by electrical characteristics |
03/18/2010 | US20100070226 Analysis of Chirp Frequency Response Using Arbitrary Resampling Filters |
03/18/2010 | US20100070225 System and method for identifying appliances by electrical characteristics |
03/18/2010 | US20100070224 System and method for identifying appliances by electrical characteristics |
03/17/2010 | CN101673934A Serial arc-fault circuit interrupter and serial arc-fault protection method thereof |
03/17/2010 | CN101672873A Detection method of transient harmonic signals of power system based on combination of Tsallis wavelet singular entropy and FFT computation |
03/17/2010 | CN100594577C System and method for analyzing power flow in semiconductor plasma generation systems |
03/16/2010 | US7680614 Method for determining the humidity and density of a dielectric material |
03/16/2010 | US7679460 Crystal oscillator tester |
03/16/2010 | US7679456 Semiconductor integrated circuit and method of testing same |
03/16/2010 | US7679355 Communicating with an implanted wireless sensor |
03/11/2010 | US20100061561 Method for performance measurement and optimization of sound systems using a sliding band integration curve |
03/11/2010 | US20100060366 Two-step vco calibration method |
03/11/2010 | US20100060258 Method for measuring the mains frequency, and electrical appliance that implements said method |
03/10/2010 | CN201421479Y Non-contact conductance measuring device based on double shielding structure and series resonance |
03/09/2010 | US7676337 Irreversible-reaction measurement method |
03/09/2010 | US7676336 Watermark embedding |
03/09/2010 | US7675370 Dynamic calibration techniques for digitally controlled oscillator |
03/09/2010 | CA2502974C Howling frequency component emphasis method and apparatus |
03/04/2010 | WO2010025196A1 Digital oscilloscope module with glitch detection |
03/04/2010 | US20100052699 Method for instantaneously determining rates of distortion of signals on an ac electrical network, and associated device |
03/04/2010 | US20100052652 Apparatus and method for spurious-free signal range measurement for rf circuitry |
03/04/2010 | CA2734865A1 Digital oscilloscope module with glitch detection |
03/03/2010 | CN201417286Y Integrated power detection device and system thereof |
03/03/2010 | CN101661059A Quantitative analysis method of harmonic voltage transmission level of nonlinear load of user terminal and device |
03/02/2010 | US7671688 Reference-less clock circuit |
03/02/2010 | US7671579 Method and apparatus for quantifying and minimizing skew between signals |
02/24/2010 | CN201413357Y Alternating current signal parameter testing device |
02/23/2010 | US7668690 System and method for determining position or speed of a commutated DC motor with error correction |
02/23/2010 | US7668674 Systems, methods, and devices for providing pulses to a motion device |
02/18/2010 | US20100039098 System for extraction and analysis of significant radioelectric signals |
02/11/2010 | US20100033254 Crystal oscillator tester |
02/10/2010 | CN201402291Y Sideband noise testing device |
02/10/2010 | CN201402289Y Electricity quality on-line monitoring device |
02/09/2010 | US7659708 Broadcast receiver having integrated spectrum analysis |
02/04/2010 | US20100026276 Method and Apparatus for Fast Fault Detection |
02/03/2010 | CN201397367Y Conducted electromagnetic interference noise analyzer of electronic device |
02/03/2010 | CN201397361Y Modularized frequency spectrum analyzer |
02/03/2010 | CN201397360Y Crystal oscillator testing device |
02/03/2010 | CN101639499A Device and method for measuring small signal harmonic distortion traced by fundamental waves |
02/03/2010 | CN100587504C Digital synchronous sampling method |