| Patents for G01R 23 - Arrangements for measuring frequencies; Arrangements for analysing frequency spectra (7,503) |
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| 01/02/1992 | DE4118700A1 Determining beat frequency of modulated pulsed signals - esp. from laser doppler anemometer used for fluid velocity measurement |
| 01/02/1992 | DE4020633A1 Circuit for time variant spectral analysis of electrical signals - uses parallel integration circuits feeding summation circuits after amplification and inversions stages |
| 12/31/1991 | US5077519 Pulse period to frequency conversion system |
| 12/26/1991 | WO1991020128A1 Anti-aliasing for frequency output sensors |
| 12/25/1991 | CN2091462U Portable harmonic wave analyzer |
| 12/24/1991 | US5075619 Method and apparatus for measuring the frequency of a spectral line |
| 12/24/1991 | US5075618 Waveform analyzer having function of simultaneously displaying wide- and narrow-band spectra or transmission characteristics |
| 12/22/1991 | WO1991019989A1 Method and apparatus for wave analysis and event recognition |
| 12/22/1991 | CA2085887A1 Method and apparatus for wave analysis and event recognition |
| 12/11/1991 | EP0460265A1 Measuring instrument with a microprocessor and coupling means with a sensor |
| 12/10/1991 | US5072187 Method and apparatus for determining the total harmonic distortion and power factor of a non-linear load circuit |
| 12/10/1991 | US5072168 Automatic scaling for display of modulation domain measurements |
| 12/04/1991 | CN2090065U Pocket high resolving power and frequency measuring instrument |
| 12/03/1991 | US5070333 Frequency-to-digital converter using a combined counted and time method |
| 11/27/1991 | CN1056582A Broad-band frequency measuring technique with phase detection and high-precision frequency meter |
| 11/26/1991 | US5068614 Swept frequency domain relectometry enhancement |
| 11/26/1991 | US5068597 Spectral estimation utilizing a minimum free energy method with recursive reflection coefficients |
| 11/12/1991 | US5065334 Method and apparatus for distinguishing narrowband continuous wave signals from broadband and impulsive signals |
| 11/12/1991 | US5065147 Method and apparatus for simulating analog display in digital display test instrument |
| 10/24/1991 | DE4034741A1 Detection and evaluation appts. for dynamic signals |
| 10/23/1991 | CN1055605A Optoelectronic high-voltage and frequency testing probe |
| 10/23/1991 | CN1014468B Frequency and time measurement circuit |
| 10/17/1991 | WO1991015776A1 Waveshape display device for facilitating observation of fine waveshape simply |
| 10/17/1991 | DE4011577A1 Spectral analysis method for human hearing - using filter bank, fast fourier transformation, analysis window length matched to required frequency resolution for each partial band |
| 10/16/1991 | EP0451955A2 Swept signal analysis instrument and method |
| 10/15/1991 | US5058146 Digital comparator, digital ratiometer and amplitude analyzer incorporating such ratiometers |
| 10/10/1991 | DE4024239C1 Synchronisation of scanning pulse generator - using Walsh transformation o calculate max. of power intensity spectrum of individual unit pulse sequence |
| 10/09/1991 | EP0450809A2 Method and apparatus for measuring the frequency of a spectral line |
| 10/08/1991 | US5056123 Frequency counter with round off function |
| 10/08/1991 | US5056115 Device for the division, at an optimum sampling rate, of a passband signal into its components on two carriers in quadrature |
| 10/08/1991 | CA1290397C Programmable frequency identifier circuit |
| 10/01/1991 | US5053936 Frequency/voltage converting device |
| 09/24/1991 | US5051916 Stimulus signal generation method to maximize dynamic range in frequency response function calculations |
| 09/24/1991 | US5051915 Frequency measuring apparatus |
| 09/19/1991 | DE4008298A1 Overshoot indicator for electrical mains network - passes mains voltage signal through fundamental frequency blocking filter for comparison with unfiltered main voltage |
| 09/19/1991 | CA2077337A1 High modulus multifilament spokes and method |
| 09/17/1991 | US5050107 Side-by-side displays for instrument having a data processing system |
| 09/10/1991 | US5048054 Line probing modem |
| 09/10/1991 | CA1288815C System for detecting and processing abnormality in electromagnetic shielding |
| 09/10/1991 | CA1288814C Radio wave leakage diagnosing system for intelligent building |
| 08/28/1991 | EP0443693A2 Frequency counting apparatus and method |
| 08/28/1991 | CN1013723B Centroid decision circuit |
| 08/27/1991 | US5043909 Method and device for excess modulation detection for signal analysis |
| 08/22/1991 | WO1991012535A1 Device for identifying traffic on a paired cable |
| 08/22/1991 | DE4004969A1 Quartz oscillator mechanical resonant frequency measuring CCT - contains bridge circuit in PLL feedback loop and potentiometer set to null |
| 08/21/1991 | EP0442081A1 Method and electronic circuit for automatically measuring the horizontal scan frequency of a composite synchronism signal |
| 08/21/1991 | CN2083296U Electronic voice-frequency detector |
| 08/21/1991 | CN1013627B N-pi phase/frequency detector |
| 08/20/1991 | US5042080 Method and device for measuring rotary speed |
| 08/20/1991 | US5041778 Electrooptic measurement systems for frequency analysis of very wide range signals |
| 08/07/1991 | EP0439658A1 Interferometric spectral analyser using Bragg cells |
| 08/07/1991 | EP0439657A1 Interferometric spectral analyser using Bragg cells |
| 08/07/1991 | CN2082421U Harmonic analysing instrument |
| 08/06/1991 | US5038097 Spectrum analyzer |
| 08/06/1991 | US5038096 Spectrum analyzer circuit for pulsed input signals |
| 07/31/1991 | EP0439157A2 Waveform analyzer having function of simultaneously displaying wide- and narrow-band spectra of transmission characteristics |
| 07/25/1991 | WO1991010913A1 Coherent frequency burst detector apparatus and method |
| 07/25/1991 | DE4001574A1 Vital organ's functioning tester for new born baby - has contactless pick=up providing signals subjected to Fourier transformation so that upper harmonics of heart beat can be evaluated |
| 07/17/1991 | EP0437034A2 I.F. calibration method |
| 07/17/1991 | EP0436543A1 Failure detection mechanism for microcontroller based control system. |
| 07/17/1991 | CN1053150A Electric freq. collecting unit of electromechanical integration |
| 07/16/1991 | US5032784 Spectrum analyzer using sync interconnect |
| 07/02/1991 | US5028864 Optically stable, large time bandwidth acousto-optic heterodyne spectrum analyzer with fixed non-zero heterodyne output |
| 07/02/1991 | US5028813 Device for monitoring a clock signal |
| 06/26/1991 | EP0434293A2 Method and device for the detection of an FM or PM modulated signal |
| 06/25/1991 | US5027055 Compact optical RF spectrum analyzer |
| 06/25/1991 | CA1285322C Digital measuring instrument |
| 06/18/1991 | US5025487 System for transmitting information on interferometrically generated optical carriers |
| 06/18/1991 | US5025135 Circuit configuration for the recognition of a plasma |
| 06/18/1991 | CA1285048C Integrated-optics implementation of an interferometric spectrum analyser |
| 06/13/1991 | WO1991008614A1 Device generating a frequency modulated signal of the 'ramp signal' type using a surface wave dispersive filter generation |
| 06/05/1991 | EP0429991A2 Method and apparatus for identifying a sine pulse signal |
| 06/02/1991 | WO1991008493A2 Method and device for comparing two variable analog signals |
| 06/02/1991 | CA2046652A1 Method and device for comparing two variable analog signals |
| 05/29/1991 | EP0428924A2 Frequency detector for discriminating multi-longitudinal mode laser operation |
| 05/28/1991 | US5020064 Electromagnetic wave device |
| 05/28/1991 | US5019823 Frequency measurement |
| 05/22/1991 | CN1012654B Equipment for measuring speed of movable parts |
| 05/14/1991 | US5015943 High power, high sensitivity microwave calorimeter |
| 05/14/1991 | CA1284179C Method and apparatus for simultaneous instantaneous signal frequency measurement |
| 05/07/1991 | US5012808 Pulse generation, parameter determination, and modification system |
| 05/02/1991 | WO1991006014A1 A wide bandwidth rf spectrum analyser |
| 05/02/1991 | EP0425095A1 Method and apparatus for frequency measurement |
| 04/30/1991 | US5010891 Cerebral biopotential analysis system and method |
| 04/17/1991 | EP0422732A2 Adaptive apparatus for identification of a periodic signal |
| 04/16/1991 | US5008610 Method for harmonic number determination in a microwave frequency counter |
| 04/09/1991 | US5005946 Multi-channel filter system |
| 04/04/1991 | WO1991004496A1 Method and apparatus for frequency measurement |
| 04/03/1991 | EP0420082A2 Digitally synchronized sweep signal source |
| 04/03/1991 | EP0419942A2 Frequency-digital converter |
| 04/02/1991 | US5004975 Adjustable electronic graticules for measuring waveform distortions |
| 03/27/1991 | EP0418498A2 Block averaging of time varying signal attribute measurements |
| 03/26/1991 | US5002395 Interferometric acousto-optic spectrum analyzer |
| 03/19/1991 | US5001724 Method and apparatus for measuring phase accuracy and amplitude profile of a continuous-phase-modulated signal |
| 03/19/1991 | CA1281792C Linear position sensor |
| 03/12/1991 | CA1281383C Random signal isolation circuit |
| 02/27/1991 | EP0140925B1 Modulation detector and classifier |
| 02/27/1991 | EP0112380B1 Frequency to current converter circuit |
| 02/26/1991 | US4996474 Digital gate generation for a signal measurement instrument |
| 02/19/1991 | US4994740 High resolution, wide band Chirp-Z signal analyzer |