| Patents for G01R 23 - Arrangements for measuring frequencies; Arrangements for analysing frequency spectra (7,503) |
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| 11/16/1993 | US5262714 Sinewave frequency measuring apparatus |
| 11/09/1993 | US5260648 Process and system for rapid analysis of the spectrum of a signal at one or several points of measuring |
| 11/03/1993 | EP0538252A4 Technique for improving the resolution of an a/d converter in a spectrometer using dither |
| 10/26/1993 | CA1323656C Method and meter for measuring the frequency of a periodical signal |
| 10/21/1993 | DE4024438A1 Digitaler Echtzeit-Frequenzmesser mit räumlicher Abtastung Real time digital frequency meter with spatial sampling |
| 10/19/1993 | US5255323 Digital signal processing device and audio apparatus using the same |
| 10/14/1993 | WO1993020454A1 Digital device for measuring the frequency of an electrical signal |
| 10/12/1993 | US5253179 Compensation for line frequency variation |
| 10/05/1993 | US5251155 System identification apparatus using spectrum analysis of resonation frequencies |
| 10/05/1993 | CA1322783C Failure detection mechanism for microcontroller based control system |
| 09/30/1993 | WO1993019384A1 Method and apparatus for processing signals to extract narrow bandwith features |
| 09/30/1993 | WO1993019378A1 Method and apparatus for time varying spectrum analysis |
| 09/29/1993 | EP0562521A2 Frequency deviation measuring apparatus |
| 09/21/1993 | US5247215 Frequency range detector |
| 09/15/1993 | CN1022138C Method of digitally evaluating frequency and phase of signals, and device for implementing such method |
| 09/14/1993 | US5245589 Method and apparatus for processing signals to extract narrow bandwidth features |
| 09/08/1993 | EP0559087A2 Digital period measuring circuit |
| 08/31/1993 | US5241302 Method for displaying signal characteristics |
| 08/26/1993 | DE4305416A1 Mains supply current frequency detector - has mains transformer coupled to period detector, and counts frequency of occurrence of period detection signal in set time |
| 08/18/1993 | WO1994018573A1 Non-harmonic analysis of waveform data and synthesizing processing system |
| 08/18/1993 | EP0555491A1 Spectrum analyzer |
| 08/11/1993 | EP0428663B1 Process and device for rapid spectral analysis of a signal at one or more measurement points |
| 08/10/1993 | US5235287 Frequency measurement receiver with bandwidth improvement through phase shifted sampling of real signals using sampling rate selection |
| 08/03/1993 | US5233546 Anti-alias filtering apparatus for frequency domain measurements |
| 07/28/1993 | EP0552300A1 Spectral data measurement and correction |
| 07/28/1993 | EP0552291A1 Method of estimating property and/or composition data of a test sample |
| 07/20/1993 | US5229716 Process and device for real-time spectral analysis of complex unsteady signals |
| 07/20/1993 | CA1320536C Apparatus and method for processing simultaneous radio frequency signals |
| 07/13/1993 | US5228093 Method for mixing source audio signals and an audio signal mixing system |
| 07/13/1993 | US5227911 Monolithic total internal reflection optical resonator |
| 07/13/1993 | CA1320250C Electrooptic measurement systems for frequential analysis of very wide range signals |
| 07/08/1993 | WO1993013597A1 Digital frequency detection circuit |
| 06/30/1993 | EP0548689A2 Process for detecting and discriminating helicopters from other vehicles at a distance |
| 06/29/1993 | US5224201 Method and device for measuring rotary speed |
| 06/29/1993 | US5224170 Time domain compensation for transducer mismatch |
| 06/22/1993 | US5222070 Optical pulse oscillator and light frequency measuring apparatus using the same |
| 06/16/1993 | EP0546614A1 Mobile radio receiver of which the initial synchronisation with a fixed station is improved by frequency estimation impulse recognition |
| 06/15/1993 | US5220275 Accumulator phase digitizer |
| 06/02/1993 | EP0544396A1 Instruments for measuring the frequency and power of a microwave signal |
| 05/26/1993 | EP0543490A1 Apparatus for adaptively tuning to a received periodic signal |
| 05/26/1993 | EP0543139A1 Jitter analyzer |
| 05/26/1993 | CN2134659Y Multifunctional evolution integrating device checking instrument |
| 05/18/1993 | US5212554 Digital method and apparatus for evaluating a frequency parameter of an if signal |
| 05/11/1993 | US5210483 Burst signal spectrum measuring system with stepwise sweeping |
| 05/04/1993 | US5208685 Compact optical processor |
| 04/28/1993 | EP0538252A1 Technique for improving the resolution of an a/d converter in a spectrometer using dither. |
| 04/27/1993 | US5206549 Frequency discriminating circuit |
| 04/27/1993 | CA1316983C Narrowband signal recognition for emi measurements |
| 04/22/1993 | DE4134473A1 Automatic nonlinear distortion measuring system - uses two frequency analysers to determine max. amplitudes of frequency components before and after decoupling |
| 04/22/1993 | DE4134472A1 Measuring harmonic distortion in AC signal by spectral analysis - digitising and calculating sine and cosine tables from sampled values before correlating with stored signal to determine fundamental and harmonic amplitudes |
| 04/14/1993 | CN2129933Y Digital frequency instrument with infrared photo electric sensor |
| 04/06/1993 | US5200656 Circuit for measuring the difference between two successive periods in a waveform |
| 04/06/1993 | CA1315847C Harmonimeter, and methods of utilizing and constructing same |
| 04/01/1993 | DE4130980A1 Measuring frequency of oscillator in IC without oscillator connection pin - using integrated measurement circuit which varies voltage at integrated circuit supply pin with period of oscillator output |
| 03/30/1993 | US5198750 Extremely wide range frequency measurement method |
| 03/30/1993 | US5198748 Frequency measurement receiver with bandwidth improvement through synchronized phase shifted sampling |
| 03/18/1993 | WO1993005403A1 Spectrum analyzer |
| 03/17/1993 | EP0531965A1 Method for presenting complex number waveforms |
| 03/10/1993 | EP0303595B1 Linear position sensor |
| 03/10/1993 | CN1020049C Method and Device for measuring rotation speed |
| 03/09/1993 | US5191956 Electronic method and circuit for analyzing analog signals |
| 03/02/1993 | US5191236 System and circuits using josephson junctions |
| 02/24/1993 | EP0527995A1 Electric circuit for measuring the frequency of laser doppler signals. |
| 02/23/1993 | US5189634 Digital signal processing apparatus for detecting a frequency component of digital signals |
| 02/18/1993 | WO1993003395A1 Method for detecting transient signals, particularly in acoustic signals |
| 02/18/1993 | CA2114632A1 Method for detecting transient signals, particularly in acoustic signals |
| 02/17/1993 | CN2127200Y Electronic tuning unit |
| 02/16/1993 | US5187598 Optical processor for pulse train identification |
| 02/11/1993 | DE4225819A1 Measurement circuit representing measured frequency values - contains clock pulse generator, edge detector, gate circuit, digital filter and corrects for display equipment scatter |
| 02/10/1993 | EP0380509B1 Measuring process and device for the analysis of disturbances in digital buses |
| 02/04/1993 | DE4121411C1 Measuring resonance frequencies of piezoelectric components - generating pulse marking time point of resonance on basis characteristic signal change using HF wobbulator controlled by LF probe signals |
| 01/27/1993 | EP0468999A4 Cerebral biopotential analysis system and method |
| 01/27/1993 | EP0308540B1 Oscillator circuit |
| 01/26/1993 | CA1313221C Apparatus for detecting frequency of input signal with a digital scanning g-converter |
| 01/21/1993 | DE4124005A1 Electronic circuit for measuring periodic signal phase and frequency differences - has cyclic serial state machine, shift register, state identification logic and comparison logic |
| 01/20/1993 | EP0523263A1 A method for determining the frequency of a dominant signal in an input signal |
| 01/20/1993 | EP0217967B1 Heterodyne-type method and apparatus for measuring signals, having means for automatically correcting the detuning |
| 01/19/1993 | US5180935 Digital timing discriminator |
| 01/13/1993 | EP0522830A1 Vehicle detector with automatic sensitivity adjustment |
| 01/13/1993 | EP0522614A1 Method of determining an electrical spectrum |
| 01/13/1993 | CA2072900A1 Vehicle detector with automatic sensitivity adjustment |
| 01/07/1993 | WO1993000142A1 Method and device for transducing sound signals into an image |
| 01/07/1993 | EP0521401A1 Signal level display unit |
| 01/05/1993 | US5177691 Measuring velocity of a target by Doppler shift, using improvements in calculating discrete Fourier transform |
| 12/30/1992 | EP0520193A1 Method for measuring partial discharges |
| 12/29/1992 | US5175880 Signal analysis |
| 12/29/1992 | US5175449 Circuit for testing the frequency of a clock in an electronic system |
| 12/25/1992 | CA2072183A1 Process for measuring partial discharges |
| 12/08/1992 | US5170114 Harmonimeter input circuit and methods of constructing and utilizing same |
| 12/01/1992 | US5168215 Instantaneous frequency measurement apparatus and method |
| 12/01/1992 | US5168214 Multi-rate superresolution time series spectrum analyzer |
| 12/01/1992 | US5168213 Swept signal analysis instrument and method |
| 11/24/1992 | US5166598 For producing an indication of a frequency content of a sample signal |
| 11/24/1992 | CA1310710C Process and arrangement for the monitoring of a clock signal |
| 11/12/1992 | DE3837760A1 Determining origins of radar pulses from several sources received in combination - involves comparison with check sequences using analysis tree with multiple planes |
| 11/10/1992 | US5163164 Microprocessor controlled digital aft unit |
| 11/10/1992 | US5162724 Spectrum analyzer capable of displaying signals obtained during a specified period by means of continuous sweep |
| 11/10/1992 | US5162723 Sampling signal analyzer |
| 11/03/1992 | WO1992019981A1 Hf background noise measurement in hf environments |
| 11/03/1992 | CA2102200A1 Hf background noise measurement in hf environments |