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