| Patents for G01R 23 - Arrangements for measuring frequencies; Arrangements for analysing frequency spectra (7,503) |
|---|
| 04/03/1990 | US4914600 Programmable frequency identifier circuit |
| 04/03/1990 | US4914380 Signal receiving arrangement |
| 03/27/1990 | US4912419 Signal conditioning circuit and method |
| 03/20/1990 | US4910688 On-machine sheet material property analysis |
| 03/20/1990 | US4909627 Integrated-optics implementation of an interferometric spectrum analyser |
| 03/14/1990 | CN1007196B Tone detector with pseudo locked loop |
| 03/07/1990 | EP0357475A1 Electro-optical measuring system for the frequency analysis of very wide band signals |
| 03/07/1990 | EP0356941A2 Electromagnetic wave device |
| 03/07/1990 | CN1007089B Intelligence frequency meter with high-resolution |
| 03/06/1990 | US4906069 For decoding radio frequency signals |
| 03/01/1990 | DE3826879A1 Interferometric Bragg cell-type spectrum analyser |
| 02/27/1990 | US4905004 Cycle-portion encoder |
| 02/27/1990 | US4904930 Method of carrier frequency estimation |
| 02/20/1990 | US4902960 Voltage input for harmonimeter, and methods of constructing and utilizing same |
| 02/15/1990 | DE3826881A1 Method for converting a sequence of pulses with a smaller duty ratio into a wave form having a larger duty ratio |
| 02/15/1990 | DE3826880A1 Interferometric Bragg cell-type spectrum analyser |
| 02/13/1990 | US4901244 Apparatus for, and method of, analyzing signals |
| 01/23/1990 | US4896102 Spectrum analyzer |
| 01/23/1990 | US4896095 Apparatus and method for determining frequency response of a system under test |
| 01/09/1990 | US4893266 Alias tagging time domain to frequency domain signal converter |
| 01/09/1990 | US4893082 Noise suppression in magnetic resonance imaging |
| 12/28/1989 | WO1989012832A1 Spectrum analyzer |
| 12/27/1989 | EP0347717A2 Circuit for determining the presence of a plasma |
| 12/26/1989 | US4890300 Radio transmitters |
| 12/26/1989 | US4890237 Method and apparatus for signal processing |
| 12/26/1989 | US4890236 Method and apparatus for aiding manual instrument settings by displaying estimates of future measurement results |
| 12/26/1989 | US4890099 Signal analyzer having partially scrolling function for display screen |
| 12/21/1989 | DE3820314A1 Circuit arrangement for monitoring clocks which are to be synchronized to one another |
| 12/20/1989 | EP0347038A2 DTMF receiver |
| 12/20/1989 | EP0346386A1 Electro-optic measurement (network analysis) system |
| 12/06/1989 | EP0344794A2 Apparatus and method for processing simultaneous radio frequency signals |
| 12/05/1989 | US4885708 Apparatus and method for measuring frequency response function |
| 12/05/1989 | CA1263717A1 Modulation detector and classifier |
| 11/29/1989 | EP0343906A2 Spectrum analysers |
| 11/29/1989 | EP0343352A1 Method and apparatus for the measurement of the rotational speed of a machine |
| 11/28/1989 | CA1263473A1 Isotropic acoustic wave substrate |
| 11/21/1989 | US4882740 Frequency counter for counting a frequency and partly varied frequencies of a signal in real time |
| 11/21/1989 | US4882545 Circuit arrangement for detecting a critical frequency of input pulses |
| 11/15/1989 | EP0116625B1 Multiple simultaneous tone decoder |
| 11/14/1989 | US4881174 Sinusoidal signal frequency measuring device |
| 11/14/1989 | CA1262935A1 Frequency abnormality detecting circuit |
| 11/08/1989 | EP0340479A2 Arrangement for monitoring a time base signal |
| 11/02/1989 | EP0340021A2 Improvements in or relating to frequency response analysis |
| 11/02/1989 | DE3813816A1 Gate circuit |
| 10/31/1989 | US4878231 N-PI phase/frequency detector |
| 10/31/1989 | US4878185 Digital measuring instrument |
| 10/25/1989 | EP0338659A1 Frequency counter |
| 10/25/1989 | EP0338333A1 Spectrum analyzer having means for displaying spectrum data together with power value thereof |
| 10/24/1989 | US4876721 Method and device for identifying different species of honeybees |
| 10/19/1989 | DE3811735A1 Method for measuring frequency |
| 10/18/1989 | EP0337100A2 Method and apparatus for measuring rotation speed |
| 10/11/1989 | CN1036268A Method and device for measuring rotation speed |
| 10/04/1989 | EP0335729A2 Method and apparatus for aiding manual instrument settings by displaying estimates of future measurement results |
| 10/03/1989 | US4871232 Method and apparatus for ultra high frequency spectrum analysis |
| 09/28/1989 | DE3817499C1 Method for the measurement of broadcast interference |
| 09/26/1989 | US4870593 Circuit and method for determining the phase angle of a complex electrical signal |
| 09/26/1989 | US4870348 Markers for readout and delta-parameter measurements on a quasi-3-dimensional display of a spectrum |
| 09/26/1989 | CA1261980A1 Signal processing system |
| 09/26/1989 | CA1261410A1 Device for controlling the time interval between pulses |
| 09/26/1989 | CA1260547A1 Digital rate averaging circuit |
| 09/26/1989 | CA1260132A1 Surface acoustic wave spectrum analyzer |
| 09/21/1989 | WO1989008849A1 Harmonimeter, and methods of utilizing and constructing same |
| 09/21/1989 | DE3808280A1 Device for distinguishing between a first and a second frequency of signals |
| 09/21/1989 | DE3808060A1 Pulse counter circuit for a Geiger-Müller counter |
| 09/21/1989 | DE3807438A1 Method and arrangement for measuring the temporal relationship between signals |
| 09/20/1989 | EP0333382A1 Frequency detection |
| 09/19/1989 | US4868494 Methods and apparatus for frequency response analysis |
| 09/19/1989 | US4868487 Frequency response analyser with multiplying digital to analogue converter |
| 09/13/1989 | CN1035595A N-pi phase/frequency detector |
| 09/12/1989 | US4866441 Wide band, complex microwave waveform receiver and analyzer, using distributed sampling techniques |
| 09/12/1989 | US4866260 Method and means for measuring the frequency of a periodic signal |
| 09/06/1989 | EP0330693A1 Frequency counting apparatus and method |
| 09/05/1989 | US4864218 Method of compensating for frequency errors in noise power meters |
| 08/22/1989 | US4859934 Apparatus for measuring the frequency of microwave signals |
| 08/22/1989 | US4859933 Narrowband signal recognition for EMI measurement |
| 08/22/1989 | US4859843 Method and apparatus for optical signal analysis using a gated modulation source and an optical delay circuit to achieve a self-homodyne receiver |
| 08/15/1989 | US4858159 Frequency-tuneable filter calibration |
| 08/09/1989 | EP0327446A1 Digital comparator, digital ratiometer and amplitude analyser using such a ratiometer |
| 08/08/1989 | US4855671 Electrical power line and substation monitoring apparatus |
| 08/01/1989 | CA1258098A1 Apparatus for data transmission from multiple sources on a single channel |
| 08/01/1989 | CA1258097A2 Hinge clamp for securing a sensor module on a power transmission line |
| 08/01/1989 | CA1258096A2 System and apparatus for monitoring and control of a bulk electric power delivery system |
| 08/01/1989 | CA1258095A2 Apparatus for measuring and calculating fourier components of a power line parameter |
| 08/01/1989 | CA1258094C Apparatus for measuring the potential of a transmission line conductor |
| 07/26/1989 | EP0325480A2 Method and apparatus for optical signal analysis using a gated modulation source and an optical delay circuit to achieve a self-homodyne receiver |
| 07/25/1989 | CA1257903A1 Frequency measurement circuit |
| 07/11/1989 | US4846579 Frequency-voltage converting circuit |
| 07/05/1989 | EP0322739A1 Simultaneous-delay correlator apparatus |
| 06/28/1989 | EP0322024A2 Signal receiving arrangement |
| 06/28/1989 | EP0321806A1 Frequency discriminator for a digital phase-locked loop |
| 06/27/1989 | US4843586 Distributed sampling of electrical and optical signals using coded switched electrode travelling wave modulators |
| 06/27/1989 | US4843328 Apparatus for using a time interval counter to measure frequency stability |
| 06/27/1989 | CA1256514A1 Filter-subtract-decimate hierarchical pyramid signal analyzing and synthesizing technique |
| 06/14/1989 | CN1033434A Centroid decision circuit |
| 06/13/1989 | US4839583 Signal analyzer apparatus with analog partial sweep function |
| 06/13/1989 | US4839582 Signal analyzer apparatus with automatic frequency measuring function |
| 06/06/1989 | US4837705 Method for calculating the rate of frequency of random events |
| 05/30/1989 | US4835703 Method of compensating for noise and pulse pile-up in the counting of random pulse data |
| 05/24/1989 | EP0316958A1 Apparatus and method for measuring frequency response function |
| 05/24/1989 | CN1033111A Multichannel on-line system for measuring power factor and cycle rate |