| Patents for G01R 23 - Arrangements for measuring frequencies; Arrangements for analysing frequency spectra (7,503) |
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| 11/30/1994 | EP0626583A2 Method for determining a periodic structure in a line spectrum and use of said method |
| 11/22/1994 | US5367266 Frequency discriminator of horizontal synchronizing signal for multi-mode monitor |
| 11/17/1994 | DE4315677A1 Circuit arrangement for determining the fundamental frequency from a signal which is not bandwidth-limited and contains harmonics and interference signals, in particular for determining the fundamental voice frequency from a voice and speech signal |
| 11/15/1994 | US5365164 Harmonic analyzer and methods of constructing and utilizing same |
| 11/09/1994 | CN1094812A Apparatus and method for the detection and measurement of liquid water and ice layers on the surfaces of solid materials |
| 11/08/1994 | CA2004863C Method and device for excess modulation detection for signal analysis |
| 11/02/1994 | EP0622963A2 Apparatus for adaptively tuning to a received periodic signal |
| 11/01/1994 | US5361159 Angular acousto-optical deflection device and spectrum analyzer using such a device |
| 10/26/1994 | EP0621682A1 Frequency divider device |
| 10/26/1994 | EP0552291A4 Method of estimating property and/or composition data of a test sample |
| 10/21/1994 | CA2121411A1 Frequency dividing device |
| 10/18/1994 | US5357196 Circuit for converting a frequency of an input signal so a signal having a digital value corresponding to the frequency |
| 10/13/1994 | WO1994023270A1 Coherent fourier transform radiometer |
| 10/05/1994 | CN1093171A Method and instrument for monitoring subsynchronous oscillation of electrical power system |
| 10/04/1994 | US5353260 Noise signal processor |
| 10/04/1994 | US5353233 Method and apparatus for time varying spectrum analysis |
| 09/29/1994 | WO1994022025A1 Plant parameter detection by monitoring of power spectral densities |
| 09/28/1994 | EP0617291A1 A method and an apparatus for detecting a frequency of a power system |
| 09/15/1994 | DE4327287C1 Method for determining the frequency of a sinusoidal signal under real-time conditions |
| 09/13/1994 | US5347464 High-pass filter for enhancing the resolution of AC power line harmonic measurements |
| 09/13/1994 | CA2057083C Digital method and apparatus for measuring the frequency of an if signal |
| 09/08/1994 | DE4319383C1 Input circuit for a pulse counter |
| 09/06/1994 | US5345168 Burst-by-burst laser frequency monitor |
| 09/01/1994 | WO1994000821A3 High-speed processing apparatus and method, signal analyzing system, and measurement apparatus and method |
| 08/30/1994 | US5343414 Apparatus for adaptively tuning to a received periodic signal |
| 08/30/1994 | US5343285 Electrical circuit for measuring the frequency of laser Doppler signals |
| 08/25/1994 | DE4404197A1 Method for digital (numeric) filtering of oscillatory signals using sine filters |
| 08/16/1994 | US5339251 Apparatus for adaptively tuning to a received periodic signal |
| 08/10/1994 | EP0609707A1 Process for detecting the instantaneous frequency |
| 08/10/1994 | EP0436543B1 Failure detection mechanism for microcontroller based control system |
| 08/09/1994 | US5337051 Approximate zero crossings for frequency determination |
| 07/06/1994 | EP0605028A1 A method and a circuit for identifying the nominal frequency of a logic signal |
| 07/05/1994 | USH1331 Wide bandwidth, high resolution circuitry for phase shifted frequency detection |
| 07/05/1994 | US5327142 Frequency encoding circuit in Bragg cell receiver |
| 06/28/1994 | US5325049 Frequency deviation measuring apparatus |
| 06/23/1994 | DE4243113A1 Automatic, spectral assignment of modulation type classifiers for defined signal spectrum |
| 06/21/1994 | US5323437 Full and partial cycle counting apparatus and method |
| 06/21/1994 | US5323103 Frequency measurement receiver with means to resolve two folding frequencies of complex signals |
| 06/14/1994 | US5321350 Fundamental frequency and period detector |
| 06/09/1994 | WO1994012888A1 Method and apparatus for discriminating computer network signals |
| 06/09/1994 | DE4320674A1 Frequency recognition circuit for multiple frequency input signals - contains signal sampling and frequency discriminator stages, control stage and output stage with temporary memory |
| 06/08/1994 | EP0600357A1 Apparatus and method for the detection and measurement of liquid water and ice layers on the surfaces of solid materials |
| 06/07/1994 | US5319569 Block averaging of time varying signal attribute measurements |
| 06/01/1994 | EP0599008A1 Procedure for determining the mean value and for compacting data of measuring instruments |
| 06/01/1994 | EP0552300A4 Spectral data measurement and correction |
| 06/01/1994 | DE4239741A1 Electrical equipment stray radio field strength measuring method - measuring field strengths at critical frequencies previously determined by power measurements |
| 05/31/1994 | US5317215 Method and apparatus for frequency discriminating computer network signals |
| 05/31/1994 | CA2110188A1 Apparatus and method for the detection and measurement of liquid water and ice layers on the surfaces of solid materials |
| 05/25/1994 | EP0598259A1 Frequency range detector |
| 05/22/1994 | CA2108850A1 Data averaging and compressing method for measuring instruments |
| 05/18/1994 | EP0597040A1 Method for detecting transient signals, particularly in acoustic signals |
| 05/17/1994 | US5313155 Driving apparatus for cross-coil type analog indicating instrument having reduced ripple |
| 05/11/1994 | CN1086605A Nd-Fe-B magnet for permanent-magnet nuclear magnetic resonance spectrometer |
| 05/10/1994 | US5311118 Ripple elimination in a frequency-to-voltage converter for a cross-coil meter |
| 04/19/1994 | US5305243 Method and device for comparing two variable analogue signals |
| 04/19/1994 | US5305242 AC power supply apparatus and load current measurement method in AC power supply apparatus |
| 04/13/1994 | EP0266402B1 Method and apparatus for optical rf amplitude equalization |
| 04/12/1994 | CA1328491C Pulse generation and tracking system |
| 04/07/1994 | DE4233222A1 Channel sounder measuring mobile radio channels - uses special, optimum test signal with several spectral lines having slight crest factor |
| 04/05/1994 | US5301123 Zero crossing based spectrum analyzer and method |
| 04/05/1994 | US5300924 Harmonic measuring instrument for AC power systems with a time-based threshold means |
| 04/05/1994 | US5300878 Swept signal analysis instrument and method |
| 03/31/1994 | WO1994007150A1 Full and partial cycle counting apparatus and method |
| 03/29/1994 | US5299231 Method and device for estimating the carrier frequency of a modulated data signal |
| 03/29/1994 | US5298888 Harmonic measuring instrument for AC power systems with latched indicator means |
| 03/29/1994 | US5298885 Harmonic measuring instrument for AC power systems with poly-phase threshold means |
| 03/15/1994 | US5295086 Method of producing noise free frequency spectrum signals |
| 03/10/1994 | DE4330425A1 Measuring frequency of time varying electronic signal - dividing input signal into several simultaneous signals, sampling simultaneously at different frequencies, generating DFT-coded signals and forming into known radix representation of frequency |
| 03/08/1994 | US5293520 Jitter analyzer |
| 03/08/1994 | US5293114 Frequency measurement receiver with means to resolve an ambiguity in multiple frequency estimation |
| 03/03/1994 | WO1994004934A1 Method for measuring frequency modulation rate characteristics for a swept frequency signal |
| 03/02/1994 | CN1083220A Fast metric instrument for frequency deviation |
| 03/01/1994 | US5291426 Method of correcting spectral data for background |
| 03/01/1994 | US5291200 Method for measuring frequency modulation rate characteristics for a swept frequency signal |
| 03/01/1994 | US5291125 Instantaneous frequency measurement (IFM) receiver with two signal capability |
| 03/01/1994 | US5291081 Apparatus for detection of non-modulated signal and frequency acquisition |
| 02/24/1994 | DE4227858A1 HF IFM receiver for measuring frequency of simultaneously received signal pulses - forms first difference w.r.t. time of sampled in-phase, quadrature and power signals, multiplies I,Q differences and sign of power difference, and determines frequency from arctangent of ratio of product and sign of product |
| 02/24/1994 | DE4227112A1 Determining Fourier spectrum components in vibration analysis - iteratively approximating spectrum using peak values in input spectrum for comparison |
| 02/17/1994 | WO1994003818A1 High speed power analyzer |
| 02/08/1994 | US5285481 For filtering an incoming data signal |
| 01/25/1994 | US5281907 Channelized time-and space-integrating acousto-optical processor |
| 01/18/1994 | US5280438 Memory circuit including an EEPROM provided with unique addressing means for storing at selected memory cells frequently incremented count data |
| 01/06/1994 | WO1994000821A2 High-speed processing apparatus and method, signal analyzing system, and measurement apparatus and method |
| 01/05/1994 | EP0577301A1 Digital receive line filter circuit with data operated squelch |
| 01/05/1994 | CN1023427C Broad-band frequency measuring method with phase detection and high-precision frequency meter |
| 01/04/1994 | US5276629 Method and apparatus for wave analysis and event recognition |
| 12/30/1993 | CA2099302A1 Method and apparatus for sample-data receiver squelch |
| 12/21/1993 | US5272446 Digitally implemented fast frequency estimator/demodulator for low bit rate maritime and mobile data communications without the use of an acquisition preamble |
| 12/16/1993 | DE4243960A1 Frequency discriminator for different horizontal synchronising frequency values for monitor - supplies input signal to multiple discriminator stage having oscillators tuned to values for phase comparison |
| 12/15/1993 | CN1023156C Fast signal spectrum analytical method |
| 12/14/1993 | US5270666 Method and circuitry for demodulation of angle modulated signals by measuring cycle time |
| 12/09/1993 | DE4218319A1 Time and frequency distribution signal analysis arrangement - contains convolution device fed via mixers converting frequency range |
| 12/08/1993 | CN1079308A Method for monitoring harmonic wave of electric power by use of electronic computer |
| 12/07/1993 | US5268689 Multi-band microwave detector |
| 12/02/1993 | DE4217736A1 Monitoring device for detecting application of glue to carton - uses contactless capacitive sensor with probes either side of substrate, and determines product of measurement signal frequencies |
| 12/01/1993 | EP0511213B1 Coherent frequency burst detector apparatus and method |
| 11/30/1993 | US5267188 Multi-channel acousto-optic spectrum analyzer |
| 11/24/1993 | EP0570608A1 Method and apparatus for counting digital pulses |
| 11/16/1993 | US5263185 AM distortion measurement method and apparatus usable on active audio carriers |
| 11/16/1993 | US5262957 Inexpensive portable RF spectrum analyzer with calibration features |