| Patents for G01R 23 - Arrangements for measuring frequencies; Arrangements for analysing frequency spectra (7,503) |
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| 02/12/1991 | US4993052 Digitally-operating electrical equipment with counter for automatically adapting output to 50 Hz or 60 Hz input |
| 02/12/1991 | CA1280165C Transmission line sensor apparatus operable with near zero current line conditions |
| 02/05/1991 | US4990848 DTMF receiver |
| 01/30/1991 | EP0410870A1 Apparatus for spectrum analysis of a numerical signal |
| 01/16/1991 | CN2069566U Constant-current two-wire system frequency/current converter |
| 01/15/1991 | US4985859 Method for identifying and interrogating the measured value of the velocity or speed of an object |
| 01/08/1991 | US4984254 Frequency counter |
| 01/08/1991 | US4984253 Apparatus and method for processing simultaneous radio frequency signals |
| 01/08/1991 | US4983919 Frequency response detection apparatus |
| 01/08/1991 | US4983906 Frequency estimation system |
| 01/01/1991 | US4982150 Spectral estimation utilizing an autocorrelation-based minimum free energy method |
| 01/01/1991 | US4982082 Frequency detector for discriminating multi-longitudinal mode laser operation |
| 12/18/1990 | US4979215 Method of digitally evaluating the frequency and the phase of signals, and a device for implementing such a method |
| 12/18/1990 | US4978909 Demodulation circuit for AC motor current spectral analysis |
| 12/18/1990 | CA1278041C Frequency counting apparatus and method |
| 12/13/1990 | WO1990015340A1 Process and device for rapid spectral analysis of a signal at one or more measurement points |
| 12/13/1990 | WO1990015339A1 Method and device for analysis of random signals |
| 12/11/1990 | US4977365 Instantaneous frequency measurement (IFM) receiver to measure frequency and angle of arrival (AOA) of multiple signals |
| 12/11/1990 | CA1277721C Method and apparatus for detecting a narrowband signal |
| 12/04/1990 | US4975633 Spectrum analyzer having means for displaying spectrum data together with power value thereof |
| 12/04/1990 | US4975594 Frequency detector circuit |
| 11/29/1990 | WO1990014739A1 Analysis of waveforms |
| 11/29/1990 | WO1990014656A1 Apparatus and methods for the generation of stabilised images from waveforms |
| 11/28/1990 | EP0399704A2 Frequency spectrum determination using interpolation |
| 11/28/1990 | EP0224563A4 High speed digital frequency counter |
| 11/27/1990 | US4973969 Coherent frequency burst detector apparatus and method |
| 11/27/1990 | US4973898 Digital spectral normalizer |
| 11/27/1990 | US4973897 System analyzer |
| 11/22/1990 | EP0398042A2 Method and apparatus for simulating analog display in digital display test instrument |
| 11/20/1990 | US4972139 Method for increasing the resolution of measurements taken using a counter-timer |
| 11/20/1990 | CA1276695C Method and apparatus for optical rf amplitude equalization |
| 11/14/1990 | EP0397535A2 Modem |
| 11/14/1990 | EP0396956A2 Display system for instruments |
| 11/14/1990 | CN1046982A Power system harmonic surveying method and instrument |
| 10/30/1990 | US4967381 Process control interface system for managing measurement data |
| 10/30/1990 | CA1275698C Device and method for signal transmission and optical communications |
| 10/18/1990 | WO1990012339A1 Multi-channel filter system |
| 10/17/1990 | EP0392582A1 Method of frequency discrimination |
| 10/16/1990 | US4964055 Hand-held power system harmonic distortion meter with selective activation of display |
| 10/16/1990 | US4963816 Instantaneous frequency measurement (IFM) receiver with only two delay lines |
| 10/13/1990 | WO1990011718A1 Cerebral biopotential analysis system and method |
| 10/10/1990 | CN2063648U Electro-optic type high-voltage, frequency measuring rod |
| 10/06/1990 | CA2013733A1 Multi-channel filter system |
| 10/04/1990 | WO1990011531A1 Frequency monitoring device |
| 10/04/1990 | WO1990011494A1 Process and device for real-time spectral analysis of complex unsteady signals |
| 10/03/1990 | CA2013444A1 Method of frequency discrimination |
| 10/02/1990 | CA1274876A1 Apparatus for measuring the frequency of microwave signals |
| 09/19/1990 | EP0387415A1 Method and apparatus for the determination of the average frequency of a random sequence of burst signals |
| 09/18/1990 | US4958294 Swept microwave power measurement system and method |
| 09/12/1990 | EP0205554B1 Interlaced digital video input filter/decimator and/or expander/interpolator filter |
| 09/12/1990 | CN2062056U Frequency shift measuring device |
| 09/04/1990 | US4954961 Method of digitally evaluating the frequency and the phase of signals, and a device for implementing such a method |
| 08/28/1990 | US4953095 Apparatus and method for measuring the frequency of a pulse signal |
| 08/21/1990 | US4951219 Method and a circuit for determining the momentary frequency of a signal |
| 08/21/1990 | US4950999 Self-contained, real-time spectrum analyzer |
| 08/14/1990 | US4949091 Spectrum analysis arrangement and automatic interception receiving station comprising such an arrangement |
| 08/08/1990 | EP0380509A1 Measuring process and device for the analysis of disturbances in digital buses. |
| 08/08/1990 | CN2060232U High-precision intelligence cycle counter |
| 08/08/1990 | CN2060231U Continuous exciting type digit steel string cycle counter |
| 08/07/1990 | US4947354 Measuring apparatus for detecting the distance "H" to an object |
| 08/07/1990 | US4947338 Signal identification method |
| 08/02/1990 | DE3917511C1 Wobbulator frequency value determining device - uses interpolation counter to restart at each frequency marker and processor to determine wanted frequency |
| 07/31/1990 | US4945303 Frequency detector |
| 07/25/1990 | EP0379050A1 Spectrum analyzer having functions for simultaneously executing plural kinds of detections and displaying resultants thereof |
| 07/18/1990 | EP0378405A2 Method and apparatus for measuring phase accuracy and amplitude profile of a continuous-phase-modulation signal |
| 07/17/1990 | US4942614 Calibration of ultrasonic transducers |
| 07/17/1990 | CA1271840A1 Amplitude modulated electrical signal analysis circuit having a frequency converter |
| 07/11/1990 | CN1043789A Extraneous frequency detector |
| 07/04/1990 | EP0376539A2 Method and device for excess modulation detection for signal analysis |
| 06/27/1990 | EP0375285A2 Extraneous frequency detector |
| 06/20/1990 | EP0374022A1 Electro-optical modulation device, and its use both in an optical deflector and in a frequency spectrum analyser |
| 06/20/1990 | EP0373802A2 Frequency measurement |
| 06/20/1990 | EP0373394A1 Method for the determination of the frequency of short bursts of electric signals |
| 06/19/1990 | CA2004136A1 Extraneous frequency detector |
| 06/19/1990 | CA1270582A1 Tracking yig tuned filter-mixer |
| 06/05/1990 | US4932062 Method and apparatus for frequency analysis of telephone signals |
| 05/31/1990 | WO1990005908A1 Improved method and apparatus for microwave transient spectroscopy of deep levels in semiconductors |
| 05/30/1990 | EP0370639A2 Signal analysis |
| 05/29/1990 | US4929890 System for obtaining digital outputs from multiple transducers |
| 05/22/1990 | US4928251 Method and apparatus for waveform reconstruction for sampled data system |
| 05/22/1990 | US4928105 Intrapulse radar receiver |
| 05/16/1990 | EP0368581A1 Method of compensating for frequency errors in noise power meters |
| 05/16/1990 | EP0367865A1 Method for the determination of the measured value of speed or rate of rotation of an object |
| 05/16/1990 | EP0367860A1 Amplitude measuring process of a periodic electrical signal G(t) in a band of signals U(t) |
| 05/16/1990 | EP0367807A1 Harmonimeter, and methods of utilizing and constructing same |
| 05/16/1990 | EP0177557B1 Counting apparatus and method for frequency sampling |
| 05/16/1990 | CN1008007B Enhanced frequency determination for spectrum analyzers and like |
| 05/09/1990 | EP0367374A1 Frequency response detection apparatus |
| 05/01/1990 | US4922343 Apparatus for detecting frequency of input signal with a digital scanning G-converter |
| 05/01/1990 | US4922256 Tracking receiver for broadband chirp emissions |
| 05/01/1990 | US4922195 Extraneous frequency detector |
| 04/25/1990 | EP0364771A1 Spectrum analyzer capable of displaying signals obtained during a specified period by means of continuous sweep |
| 04/17/1990 | US4918382 Method for distinguishing between real and spurious responses in a spectrum analyzer |
| 04/17/1990 | US4918381 Automated method for determining total harmonic distortion |
| 04/11/1990 | EP0362542A1 Method and device for the evaluation of signals having a periodic content or of pulse trains |
| 04/11/1990 | CN1041221A Microwave freq measuring method and instrument without a pll |
| 04/10/1990 | US4916698 Failure detection mechanism for microcontroller based control system |
| 04/10/1990 | US4916677 Automatic period and frequency measurements |
| 04/10/1990 | US4916383 Frequency response analysis |
| 04/05/1990 | WO1990003602A1 Failure detection mechanism for microcontroller based control system |