| Patents for G01R 23 - Arrangements for measuring frequencies; Arrangements for analysing frequency spectra (7,503) |
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| 09/16/1981 | EP0035846A2 Frequency check apparatus and utilisation in Go/No-Go apparatus |
| 09/15/1981 | US4289974 Voltage frequency meter of synchronous electrical machine |
| 09/15/1981 | US4289956 Time-period comparing device |
| 09/01/1981 | CA1108247A1 Methods and apparatus for enhancing resolution in pulse analysis |
| 08/25/1981 | US4286326 Digital devices for spectrum analysis |
| 08/25/1981 | US4286220 Method and device for discriminating difference frequency of two pulse trains |
| 08/18/1981 | CA1107354A1 Frequency-voltage converter |
| 07/22/1981 | EP0032276A1 Signal Processing Apparatus |
| 07/15/1981 | EP0032130A1 Radio frequency detector |
| 07/14/1981 | US4278903 Phase comparison circuit |
| 07/08/1981 | EP0031769A2 Very broad band samplers |
| 07/07/1981 | CA1104724A1 Digital frequency measuring circuitry |
| 06/30/1981 | CA1104234A1 Flame detector |
| 06/16/1981 | US4274049 Integrated optical R-F spectrum analyzer |
| 06/16/1981 | US4274047 Analyzer for nonlinear networks |
| 06/16/1981 | CA1103338A1 Frequency measuring circuit in a passive radar receiver |
| 06/11/1981 | WO1981001616A1 A measuring device for measuring the carrier frequency of short duration pulses |
| 06/09/1981 | US4272719 Electric field intensity measuring apparatus |
| 05/26/1981 | US4270151 Microphone mixer with predistortion indication |
| 05/20/1981 | EP0028878A1 Digital frequency measuring circuitry |
| 05/12/1981 | US4267515 Distortion factor meter circuit |
| 05/12/1981 | CA1101081A1 Sample and hold frequency to voltage converter circuit |
| 05/06/1981 | EP0028103A1 A spectrum analyzer |
| 05/05/1981 | US4266147 Circuit arrangement for forming a speed-proportional output voltage from a speed-proportional pulse sequence |
| 05/05/1981 | CA1100330A1 Digital speedometer for indicating velocity in at least two selectable units of measurement |
| 04/28/1981 | US4264958 Video processor for a spectrum analyzer |
| 04/22/1981 | EP0027204A1 Rotational-frequency voltage converter |
| 04/21/1981 | CA1099787A1 Frequency measuring system |
| 04/14/1981 | US4262249 Base line clipper for spectrum analyzer display |
| 03/24/1981 | US4258423 Microprocessor controlled digital detector |
| 03/24/1981 | US4258314 Nonlinear distortion measurement using composite pulse waveform |
| 03/24/1981 | US4258300 Apparatus for measuring the frequency of a pulse-generator and numerical control system using such apparatus |
| 03/17/1981 | US4257104 Apparatus for spectrum analysis of an electrical signal |
| 03/17/1981 | US4257003 Wide range frequency counter |
| 02/24/1981 | US4253152 Spectrum analyzer with parameter updating from a display marker |
| 02/24/1981 | US4253060 RF Spectrum analyzer |
| 02/24/1981 | CA1096474A1 Precision speed switch control |
| 02/17/1981 | US4251869 Frequency-to-binary converter |
| 02/17/1981 | CA1095988A1 Calibrating and measuring circuit for a capacitive probe-type instrument |
| 02/11/1981 | EP0023735A1 Circuit arrangement for comparing two alternating voltages of the same frequency |
| 02/03/1981 | US4249257 Radio frequency signals analyzer |
| 01/27/1981 | US4247950 Display for frequency received by radio receiver |
| 01/20/1981 | CA1094223A1 Ratemeter which calculates the reciprocal of the period |
| 01/20/1981 | CA1094172A1 Digitally synthesized back-up frequency |
| 01/07/1981 | EP0021554A2 Method and device for measurement of the rate of change of frequency of a pulse train |
| 01/06/1981 | US4244024 Spectrum analyzer having enterable offsets and automatic display zoom |
| 01/06/1981 | US4243940 AC to DC converter for antiskid systems |
| 01/06/1981 | US4243935 Adaptive detector |
| 12/23/1980 | CA1092193A1 Power monitor |
| 12/16/1980 | CA1091775A1 Frequency responsive switching circuit |
| 12/09/1980 | US4238727 Digitally programmable apparatus for generating a substantially linear ramp signal |
| 11/25/1980 | US4236110 Digital frequency deviation meter |
| 11/25/1980 | CA1090430A1 Digital signal selective circuit |
| 11/18/1980 | CA1090009A1 True mean rate measuring system |
| 11/11/1980 | CA1089539A1 Count logic circuit |
| 11/04/1980 | US4232394 Station-signal frequency indication system for radio receiver |
| 11/04/1980 | US4232267 Digital signal selective circuit |
| 11/04/1980 | US4232263 Measuring installation for frequency analysis of signal levels within a large amplitude range |
| 11/04/1980 | US4231374 Procedure and device for the detection of extraordinary events in a series of essentially periodically recurring normal events |
| 10/29/1980 | EP0017966A1 Apparatus for evaluating physiological, essentially periodical pulse trains |
| 10/28/1980 | US4231029 Automatic transfer control device and frequency monitor |
| 10/28/1980 | US4230991 Digital frequency process and method using frequency shifting techniques, especially for low frequency measurements |
| 10/28/1980 | CA1088638A1 Frequency selective detector circuit |
| 10/15/1980 | EP0017251A1 Circuitry for determining the mean period length of a periodical signal |
| 10/14/1980 | CA1087743A1 Digital monitoring system |
| 10/07/1980 | US4227096 Microwave integrated circuit for Josephson voltage standards |
| 09/30/1980 | US4225796 Frequency-to-current conversion circuit |
| 09/23/1980 | US4224574 Digital frequency quadrupler |
| 09/23/1980 | US4224568 Frequency to digital converter |
| 09/16/1980 | US4223265 High-impedance and wide-band voltage probe for the selective measurement of interference voltages |
| 09/16/1980 | US4222394 System for processing a waveform for a larynx stroboscope |
| 09/16/1980 | CA1085925A1 Apparatus for measuring the frequency of microwave signals |
| 09/09/1980 | US4222095 Frequency to voltage converter |
| 09/09/1980 | US4221223 Cardiac monitoring apparatus |
| 09/09/1980 | CA1085459A1 Digital phase and frequency meter |
| 08/26/1980 | US4219777 Detector for multiplicity of radio wave frequencies |
| 08/26/1980 | US4219775 Electron spin echo system having magnetic field shift during generation of the echo signal |
| 08/26/1980 | CA1084590A1 Selective intermodulation distortion measurement |
| 08/05/1980 | US4216463 Programmable digital tone detector |
| 07/29/1980 | US4215315 Low frequency signal period or ratio (period)-to-voltage converter |
| 07/29/1980 | US4215308 Self calibrating crystal controlled frequency counter method and apparatus |
| 07/29/1980 | US4215280 Phase responsive frequency detector |
| 07/22/1980 | US4214299 Frequency-voltage converter |
| 07/15/1980 | CA1081786A1 Method and apparatus for tuning musical instruments |
| 07/09/1980 | EP0012961A1 Device for the determination of faults in electric distribution networks influencing the frequency and application of such a device for frequency regulation in said networks |
| 07/01/1980 | CA1080798A1 Pulsed rf excited spectrometer having improved pulse width control |
| 06/03/1980 | US4206403 Apparatus for measuring the frequency of microwave signals |
| 05/20/1980 | US4204165 Multichannel coherent receiver |
| 05/14/1980 | EP0010922A1 Device for determining periodic components of an alternating signal |
| 05/13/1980 | US4203061 Rotational speed indicating apparatus |
| 04/30/1980 | EP0010344A1 Digital signal detector |
| 04/15/1980 | US4198606 Tuning apparatus |
| 04/08/1980 | US4197508 Period-to-voltage converting device |
| 04/08/1980 | US4197502 Digital signal detector |
| 04/02/1980 | EP0009192A1 Circuit for generating a pulse train for a periodic signal |
| 03/25/1980 | CA1074402A1 Sideband detector |
| 03/18/1980 | US4193686 Counting circuit for determining the incoming frequency or received channel in a high-frequency superhet receiver |
| 02/20/1980 | EP0008160A1 Programmable digital tone detector |
| 02/19/1980 | CA1072197A1 Automatic transfer control device and frequency monitor |
| 02/12/1980 | US4188628 Frequency measuring circuit in a passive radar receiver |