| Patents for G01R 23 - Arrangements for measuring frequencies; Arrangements for analysing frequency spectra (7,503) |
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| 11/18/1998 | EP0877945A1 A receiver for spectrum analysis |
| 11/10/1998 | US5834930 Device for sensing the period of a digitized signal including noise evaluation and averaging over a plurality of zero crossing |
| 11/05/1998 | WO1998049567A2 Analog spectrum display for environmental control |
| 11/05/1998 | CA2286157A1 Analog spectrum display for environmental control |
| 11/03/1998 | US5832414 Generator protection system and method of compensating for errors in phasor estimation due to oscillations in discrete Fourier transform |
| 11/03/1998 | US5832413 Generator protection system and method for phasor estimation and frequency tracking during frequency ramping |
| 10/27/1998 | US5828227 Abnormality detecting apparatus for electric equipment, particularly for a rotating electric machine |
| 10/21/1998 | EP0872739A2 Frequency detection circuit |
| 10/20/1998 | US5825172 Continuous up/down spectrum scaling of signals |
| 10/15/1998 | DE19814190A1 Phase-locked-loop synchronisation error measuring method |
| 10/14/1998 | CN2294477Y Quartz chip dynamic measuring frequency sorter |
| 10/06/1998 | US5818881 Digital frequency demodulator |
| 10/06/1998 | US5818858 Device for producing an electric potential having a difference frequency of a self-mixed signal in a laser resonator |
| 10/06/1998 | US5818240 Method and system for measuring signal transfer characteristics in the presence of WOW, flutter and intermodulation distortion |
| 10/06/1998 | US5818215 Direct digital synthesizer driven phase lock loop spectrum analyzer |
| 09/30/1998 | EP0868021A2 Method and apparatus for performing carrier detection |
| 09/27/1998 | CA2233131A1 Method and apparatus for performing carrier detection |
| 09/22/1998 | US5812626 For measuring a pulse spacing of a pulse signal |
| 09/22/1998 | US5811664 Debris monitoring |
| 09/17/1998 | WO1998040755A1 Analysis of noise in repetitive waveforms |
| 09/17/1998 | WO1998040693A2 Time interval measurement system incorporating a linear ramp generation circuit |
| 09/10/1998 | DE19700740A1 Frequency evaluation method for sinusoidal signal section |
| 09/01/1998 | US5801525 Frequency discriminating power sensor |
| 08/20/1998 | WO1998036293A1 Method for the automatic analysis of frequency passband of recorded signals |
| 08/20/1998 | WO1998036284A1 Real time signal analyzer |
| 08/20/1998 | DE19804571A1 Spectrum analyser with several input signal measuring channels |
| 08/20/1998 | CA2250355A1 Method for the automatic analysis of frequency passband of recorded signals |
| 08/19/1998 | EP0858604A1 Source of waveform distortion discrimination circuit and method |
| 08/13/1998 | WO1998035538A1 Method for determining the resonance frequency of an electric resonant circuit |
| 08/11/1998 | US5794188 Speech signal distortion measurement which varies as a function of the distribution of measured distortion over time and frequency |
| 08/11/1998 | US5793244 Logarithmic conversion circuit |
| 08/04/1998 | US5790413 Plant parameter detection by monitoring of power spectral densities |
| 08/04/1998 | US5790412 Recursive frequency aging estimation and prediction devices, methods and computer programs for crystal oscillators |
| 08/04/1998 | US5789928 Circuit and method for discriminating the source of waveform distortion in an electric power generation and distribution system |
| 08/04/1998 | US5789927 Baseband measurement of RF power amplifier distortion |
| 07/22/1998 | CN1188547A Power spectral density estimation method and apparatus |
| 07/21/1998 | US5784285 Waveform analyzer |
| 07/16/1998 | DE19700954A1 Method for detection of hydrogen in steels |
| 07/15/1998 | EP0853309A1 Method and apparatus for signal analysis |
| 07/14/1998 | US5781039 Frequency controlled switch |
| 07/14/1998 | US5780759 Method for pitch recognition, in particular for musical instruments which are excited by plucking or striking |
| 07/14/1998 | US5780743 Resonance identification in hydraulic cylinder piston position sensing |
| 07/08/1998 | EP0552300B1 Spectral data measurement and correction |
| 07/07/1998 | US5777464 Spectrum analyzer |
| 06/30/1998 | US5774366 Method for obtaining the fundamental and odd harmonic components of AC signals |
| 06/23/1998 | US5771443 Method and apparatus for measuring FM frequency deviation |
| 06/23/1998 | US5770955 Integrated circuit with capacitor-charging circuit for use in signal responsive devices |
| 06/18/1998 | WO1998026298A1 Real-time signal analyzer |
| 06/17/1998 | CN1184930A Method for measuring long period ultrashort pulsation submillimetre wave frequency |
| 06/10/1998 | EP0847151A2 All optical RF signal channelizer |
| 06/09/1998 | US5764045 Frequency measuring apparatus |
| 06/04/1998 | DE19648915A1 Frequency conversion method |
| 06/02/1998 | US5761074 Frequency data converter and meter apparatus |
| 05/22/1998 | WO1998021818A1 Apparatus for tracking resonant frequency |
| 05/22/1998 | CA2271479A1 Apparatus for tracking resonant frequency |
| 05/19/1998 | US5754440 Apparatus for harmonic analysis of waveforms in an AC electrical system |
| 05/13/1998 | EP0841569A2 A spectrum analyser |
| 05/05/1998 | US5749047 Method and apparatus for recognizing a test signal and determining signal transfer characteristics therefrom |
| 05/05/1998 | US5748507 Real-time superresolution signal processing |
| 05/05/1998 | US5748001 Method and apparatus for fast response and distortion measurement |
| 04/29/1998 | EP0838669A2 Method and means for noise measurement of electric machines and apparatus |
| 04/28/1998 | US5744969 Analog and mixed signal device tester |
| 04/23/1998 | DE19745391A1 Decimating filter arrangement with analogue processing FIR filter |
| 04/22/1998 | EP0752106A4 Method and apparatus for analyzing a waveform |
| 04/21/1998 | US5742522 Adaptive, on line, statistical method and apparatus for detection of broken bars in motors by passive motor current monitoring and digital torque estimation |
| 04/14/1998 | US5739807 Method for presenting complex number waveforms |
| 04/14/1998 | US5739709 Phase frequency detecting circuit |
| 04/14/1998 | US5739698 Machine fault detection using slot pass frequency flux measurements |
| 04/08/1998 | EP0834079A1 A power spectral density estimation method and apparatus |
| 04/08/1998 | CN1178327A Method for determining loss coefficients and dielectrical constants of insulation layers between circuit layers of multi-layer circuit board |
| 04/07/1998 | US5736845 In an input signal |
| 04/02/1998 | WO1998013742A1 Frequency-voltage conversion circuit, delay amount judgement circuit, system having frequency-voltage conversion circuit, method of adjusting input/output characterictics of frequency-voltage conversion circuit, and apparatus for automatically adjusting input/output characteristics of frequency-voltage conversion circuit |
| 03/31/1998 | US5734578 Optical RF spectrum analyzer |
| 03/31/1998 | US5734338 Vehicle detector with automatic sensitivity adjustment |
| 03/25/1998 | EP0763209B1 Process for determining the harmonic oscillations of the fundamental component of an electric signal |
| 03/18/1998 | EP0829960A2 Improvements in or relating to electronic filters |
| 03/18/1998 | CN1176416A Time measurement device |
| 03/17/1998 | US5729421 Circuit analyzing system |
| 03/17/1998 | US5729145 Method and apparatus for detecting arcing in AC power systems by monitoring high frequency noise |
| 03/17/1998 | US5729124 Estimation of signal frequency using fast walsh transform |
| 03/12/1998 | WO1998010304A1 Method to determine fundamental and harmonic oscillations of a measured electrical quantity |
| 03/12/1998 | DE19637676A1 Verfahren zum Bestimmen von Grund- und Oberschwingungen einer elektrischen Meßgröße A method for determining primary and secondary vibrations of an electric measured variable |
| 03/11/1998 | EP0804740A4 Handheld vector network analyzer |
| 03/05/1998 | DE19738541A1 Electronic timer, especially for differential pressure sensors |
| 03/04/1998 | EP0826972A2 Harmonic measurement system |
| 02/25/1998 | EP0824776A1 Method and apparatus for detecting arcing in ac power systems by monitoring high frequency noise |
| 02/25/1998 | CN1174436A Earthleakage-current protection device |
| 02/24/1998 | US5721689 System and method for phasor estimation and frequency tracking in digital protection systems |
| 02/18/1998 | CN1173643A Spectrum analysis/tracking sweep generator |
| 02/17/1998 | US5719782 Frequency measuring apparatus and frequency measuring method |
| 02/12/1998 | DE19734040A1 Spectrum analyser especially for TV signal analysis |
| 02/11/1998 | EP0823637A1 Apparatus for calculating the velocity of a vehicle from pulsating components in the output of the electric power generator |
| 02/11/1998 | CN2274348Y Equiprecision fully-automatic frequency meter |
| 01/28/1998 | EP0821515A2 A digital resolution translator |
| 01/27/1998 | US5712573 Network analyzer with adaptable sweep time between measurement points |
| 01/22/1998 | WO1998002760A1 Improved fast fourier transform sensor processor using enhanced frequency domain principles |
| 01/21/1998 | CN1170876A Evaluating device for high order harmonic wave flow |
| 01/20/1998 | US5710710 Frequency counter with reduced false correlations |
| 01/13/1998 | US5708378 Frequency-to-voltage converting apparatus |
| 01/13/1998 | US5708375 Minimum pulse width detector for a measurement instrument |