| Patents for G01R 23 - Arrangements for measuring frequencies; Arrangements for analysing frequency spectra (7,503) |
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| 01/08/1998 | WO1998000723A1 Baseband measurement of rf power ampliflier distortion |
| 01/08/1998 | WO1998000722A1 Precise digital frequency detection |
| 01/07/1998 | EP0653070B1 High speed power analyzer |
| 01/06/1998 | US5706202 Frequency spectrum analyzing apparatus and transmitter characteristics measuring apparatus using the same |
| 12/31/1997 | CN1169186A Receiver for spectrum analysis |
| 12/17/1997 | EP0812425A1 Process and machine for signal waveform analysis |
| 12/03/1997 | EP0552291B1 Method of estimating property and/or composition data of a test sample |
| 11/19/1997 | CN1165448A Tone Detector |
| 11/18/1997 | US5689539 Time interval measurement system and a method applied therein |
| 11/13/1997 | DE19717885A1 Verfahren und Vorrichtung mit zwei gleichzeitig benutzten Beobachtungskameras, welche dreidimensionale Messungen am Ort und in Echtzeit von einer komplexen Struktur auf einem Stapel dünner Schichten während einer Auftragungs- oder Abtragungsoperation gestatten Method and apparatus used simultaneously with two observation cameras, which allow three-dimensional measurements in real time at the location of a complex structure on a stack of thin films during a removal operation or APPLICATION: |
| 11/11/1997 | US5686841 Apparatus and method for the detection and measurement of liquid water and ice layers on the surfaces of solid materials |
| 11/11/1997 | CA2123847C Low frequency discriminator circuit |
| 11/06/1997 | DE19706334A1 Logarithmic converter for input circuit of waveform analyser e.g. spectrum analyser |
| 11/05/1997 | EP0804740A1 Handheld vector network analyzer |
| 11/04/1997 | US5684920 Acoustic signal transform coding method and decoding method having a high efficiency envelope flattening method therein |
| 10/30/1997 | DE19710490A1 Signal frequency converter circuit |
| 10/29/1997 | CN1163681A Process and device for generating any desired M-phase Nth order distribution system in converter-fed device |
| 10/22/1997 | EP0801745A1 Measuring method for determining the amplitude and phase of the fundamental tone of an alternating voltage |
| 10/22/1997 | CN1162996A Method for detecting a signal |
| 10/21/1997 | US5680059 Abnormality detecting method and apparatus for electric equipment, particularly for a rotating electric machine |
| 10/14/1997 | US5677984 Complex cepstrum analyzer for speech signals |
| 10/07/1997 | US5675498 Measuring amplitude of sparsely sampled sinusoidal signal |
| 09/30/1997 | US5672974 Returned reference compatible, straightaway envelope delay measurement instrument and method |
| 09/30/1997 | US5672007 On a body of water |
| 09/25/1997 | DE19611479A1 Frequency determination method for short, weak signals, suitable e.g. for ASIC technology |
| 09/25/1997 | DE19610502A1 Error correction process for synthetic aperture radar data |
| 09/24/1997 | EP0796433A1 Plant parameter detection by monitoring of power spectral densities |
| 09/23/1997 | US5671147 AC mains test system for measuring current harmonics and voltage variations |
| 09/17/1997 | EP0795755A2 Method of non-harmonic analysis of waveforms for synthesis, interpolation and extrapolation |
| 09/11/1997 | DE19608331A1 Frequency of input signal measuring system esp. for Doppler log of boat |
| 09/04/1997 | WO1997032392A1 Method and apparatus for determining the change in frequency of a reference signal |
| 09/04/1997 | CA2247898A1 Method and apparatus for determining the change in frequency of a reference signal |
| 09/03/1997 | EP0793108A2 Apparatus for harmonic analysis of waveforms in an AC electrical system |
| 09/03/1997 | EP0648357B1 High-speed processing apparatus and method, signal analyzing system, and measurement apparatus and method |
| 09/02/1997 | US5663970 Circuit and method for testing frequencies |
| 09/02/1997 | US5663933 Meter circuit |
| 09/02/1997 | US5663727 Frequency response analyzer and shaping apparatus and digital hearing enhancement apparatus and method utilizing the same |
| 08/26/1997 | US5661419 Dynamic phase-frequency detector circuit |
| 08/21/1997 | WO1997030357A1 Phase- and frequency detector |
| 08/21/1997 | CA2246375A1 Phase- and frequency detector |
| 08/13/1997 | EP0788607A1 Ratiometric fourier analyzer |
| 08/12/1997 | US5657361 Variant frequency detector circuit |
| 08/06/1997 | EP0787995A2 Waveform analyzer |
| 08/05/1997 | US5654716 Circuit for short duration multiple look pulse based frequency measurement |
| 07/30/1997 | EP0786093A1 Method for detecting a signal |
| 07/29/1997 | US5652532 Frequency difference detection apparatus |
| 07/23/1997 | EP0468999B1 Cerebral biopotential analysis system and method |
| 07/17/1997 | DE19701209A1 Spectrum analyser with phase-locked loop PLL synthesiser |
| 07/15/1997 | US5649311 Switching circuit for a satellite broadcasting converter capable of assuring a high sensitivity |
| 07/15/1997 | US5649304 Method and apparatus for communicating auxiliary information in a measurement signal |
| 07/08/1997 | US5646955 Apparatus for measuring cycle to cycle jitter of a digital signal and method therefor |
| 07/02/1997 | CN1153556A Method and device for monitoring power-supply networks |
| 07/01/1997 | US5644288 Vehicle speed detecting apparatus |
| 06/24/1997 | US5642039 Handheld vector network analyzer |
| 06/18/1997 | EP0778937A1 Debris monitoring |
| 06/04/1997 | EP0776478A1 Method and device for monitoring power-supply networks |
| 05/29/1997 | WO1997019359A1 Improved frequency counter with reduced false correlations |
| 05/20/1997 | US5631582 Frequency and phase comparator |
| 05/14/1997 | CN2254189Y Light beam and digit double display installation type KWH meter |
| 05/09/1997 | WO1997016739A1 Source of waveform distortion discrimination circuit and method |
| 05/09/1997 | WO1997016738A1 Measuring method for determining the amplitude and phase of the fundamental tone of an alternating voltage |
| 05/09/1997 | CA2236706A1 Source of waveform distortion discrimination circuit and method |
| 04/23/1997 | CN2252993Y Multifunction electrical network harmonic analyzer |
| 04/15/1997 | US5621341 Temperature-compensated, precision frequency-to-voltage convertor |
| 04/01/1997 | US5617523 Waveform display apparatus for easily realizing high-definition waveform observation |
| 03/19/1997 | EP0763209A1 Process for determining the harmonic oscillations of the fundamental component of an electric signal |
| 03/18/1997 | US5612639 Capacitor charging circuit with process variation compensation |
| 03/13/1997 | WO1997008992A1 Improved system for measuring the period of a quasi-periodic signal |
| 03/13/1997 | DE19635890A1 Spectral analysis for measurement e.g. of carrier-to-noise ratio |
| 03/12/1997 | EP0762628A1 Digital frequency demodulator |
| 03/11/1997 | US5610847 Ratiometric fourier analyzer |
| 03/11/1997 | US5610594 Frequency monitoring device |
| 02/25/1997 | US5606510 High speed power analyzer |
| 02/19/1997 | EP0758750A2 AC mains test system for measuring current harmonics and voltage variations |
| 02/11/1997 | US5602751 Method and apparatus for spectrum analysis by complex cumulants |
| 02/05/1997 | EP0757440A2 A time interval measurement system and a method applied therein |
| 02/05/1997 | CN2246809Y Super low-frequency response tester |
| 02/04/1997 | US5600527 Circuit interrupter providing protection and waveform capture for harmonic analysis |
| 01/28/1997 | US5598116 Of an input pulse signal |
| 01/22/1997 | EP0660938B1 Full and partial cycle counting apparatus and method |
| 01/09/1997 | WO1997001101A1 A power spectral density estimation method and apparatus |
| 01/09/1997 | CA2224680A1 A power spectral density estimation method and apparatus |
| 01/08/1997 | EP0752106A1 Method and apparatus for analyzing a waveform |
| 01/07/1997 | US5592390 Time based method for analyzing a waveform |
| 01/07/1997 | US5591962 Synchronous signal detection apparatus with a photoconductive photodetector |
| 12/24/1996 | US5587917 Data collection and processing for digital AC power system monitor/analyzer |
| 12/23/1996 | CA2163411A1 Method for obtaining the fundamental and odd harmonic components of ac signals |
| 12/18/1996 | EP0749210A2 Counting circuit for measuring pulse spacing, sampling circuit, skew adjusting circuit, and logic analyzing circuit |
| 12/17/1996 | US5585714 Wide bandwidth RF spectrum analyser |
| 12/17/1996 | US5584295 System for measuring the period of a quasi-periodic signal |
| 12/11/1996 | EP0548253B1 Frequency counter and method of counting frequency of a signal to minimize effects of duty cycle modulation |
| 12/04/1996 | EP0538252B1 Technique for improving the resolution of an a/d converter in a spectrometer using dither |
| 11/26/1996 | US5579463 Waveform display apparatus of frequency sweep type for facilitating display of a high definition waveform |
| 11/20/1996 | EP0743746A2 Digitally synchronized sweep signal source |
| 11/19/1996 | US5576978 High resolution frequency analyzer and vector spectrum analyzer |
| 11/12/1996 | US5574360 Simultaneous signal detector |
| 11/07/1996 | WO1996035250A1 Method and apparatus for detecting arcing in ac power systems by monitoring high frequency noise |
| 10/30/1996 | EP0740415A1 Switching circuit for a satellite broadcasting converter |
| 10/24/1996 | DE19615651A1 Spectral analyser measuring method |
| 10/15/1996 | US5566100 Estimation of signal frequency using fast walsh transform |