| Patents for G01R 23 - Arrangements for measuring frequencies; Arrangements for analysing frequency spectra (7,503) |
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| 01/29/1980 | CA1070764A1 Frequency-comparing devices |
| 01/15/1980 | US4184114 Arrangement for indicating revolutional speed of a revolving body |
| 12/25/1979 | US4180777 Tuning meter for use with a pulse count FM demodulation circuit |
| 12/12/1979 | EP0005946A1 Time-period comparing device |
| 12/04/1979 | US4177428 Circuit arrangement for amplifying oscillator oscillations and converting same to rectangular signals |
| 11/20/1979 | CA1066809A1 Digital error counting circuit |
| 10/31/1979 | EP0004984A1 Frequency control circuit for electric power distribution networks |
| 10/30/1979 | US4173003 Deltic (time compressor) with adjustable multiplication ratio |
| 10/23/1979 | CA1065017A1 Digital-analog frequency error signaling |
| 10/18/1979 | WO1979000808A1 Device for measuring the frequency of a pulse generator and digital control system comprising such a device |
| 10/16/1979 | CA1064619A1 Transfer function measurement |
| 10/09/1979 | CA1064116A1 Pulsimeter |
| 09/18/1979 | US4168526 Digital circuit generating a vital relay |
| 09/18/1979 | US4168516 Precision speed switch control |
| 08/28/1979 | US4166248 Sample and hold frequency to voltage converter circuit |
| 08/23/1979 | WO1979000585A1 Arrangement for measuring the ratio between a number of events occurring after each other in a first and second series of events |
| 08/21/1979 | US4165459 Time interval measurement |
| 08/07/1979 | CA1060109A1 Logarithmic frequency to voltage converter |
| 07/24/1979 | US4162500 Ridged waveguide antenna submerged in dielectric liquid |
| 07/24/1979 | US4162443 Speed measuring systems |
| 07/11/1979 | EP0002790A2 Measuring device for frequency analysis of signal levels within a large dynamic range |
| 07/10/1979 | CA1058288A1 Frequency detector circuit |
| 06/12/1979 | US4158172 Digital speedometer for indicating velocity in at least two selectable units of measurement |
| 06/05/1979 | US4157506 Flame detector |
| 06/05/1979 | US4157457 Frequency analyzer comprising a digital band-pass and a digital low-pass filter section both operable in a time-division fashion |
| 05/29/1979 | US4156929 Digital monitoring system |
| 05/22/1979 | US4156183 Method of and means for measuring the level of test signals over selected wide band frequency ranges |
| 05/15/1979 | US4154096 Circuit for producing a digital count representing the average value of a variable frequency |
| 05/01/1979 | US4152652 Apparatus for and method of measuring radio frequency signals |
| 05/01/1979 | US4152642 Signal analysis |
| 05/01/1979 | US4151775 Electrical apparatus for determining the pitch or fundamental frequency of a musical note |
| 04/24/1979 | US4151472 Selective calling circuit employing controlled power supply therefor |
| 04/17/1979 | US4150432 Frequency counter and method |
| 03/27/1979 | US4146836 Power monitor |
| 03/20/1979 | US4145660 Frequency activated circuit |
| 03/13/1979 | US4144491 Frequency measuring apparatus |
| 03/13/1979 | US4144490 Electronic sensing and measuring apparatus for signals in audio frequency range |
| 03/13/1979 | US4144489 Simplified frequency to digital converter using all digital electronics |
| 02/20/1979 | CA1049094A1 Apparatus and method for measuring the frequency of a sweeping signal |
| 02/13/1979 | US4139819 Multifunction frequency counter |
| 01/30/1979 | US4137497 Frequency measuring apparatus |
| 01/30/1979 | US4137496 Line frequency deviation monitor |
| 01/16/1979 | US4135243 Single sampler heterodyne method for wideband frequency measurement |
| 01/16/1979 | US4135131 Microwave time delay spectroscopic methods and apparatus for remote interrogation of biological targets |
| 01/02/1979 | US4133039 True mean rate measuring system |
| 12/26/1978 | US4131890 Spectral analysis |
| 12/26/1978 | CA1045208A1 Anode adjustment |
| 12/19/1978 | US4130808 Phase lock stabilized swept frequency signal source |
| 12/19/1978 | US4130799 Method and apparatus for continuous frequency measurement |
| 12/19/1978 | US4130796 Calibrating and measuring circuit for a capacitive probe-type instrument |
| 12/12/1978 | US4129827 Amplitude probability detector |
| 12/05/1978 | US4128811 Frequency indicating circuit |
| 12/05/1978 | US4128808 Channel frequency analyser |
| 10/31/1978 | US4123704 Frequency deviation digital display circuit |
| 10/24/1978 | US4122391 Frequency deviation measuring and adjusting system |
| 10/17/1978 | US4120296 Pulsimeter |
| 10/17/1978 | US4120229 Electronic tuner |
| 10/03/1978 | US4118666 Automatic communication signal monitoring system |
| 09/26/1978 | US4117419 Frequency measuring system employing an auto-correlation function frequency control loop |
| 09/26/1978 | US4117355 Temperature independent trigger pulse analysis circuit |
| 09/26/1978 | CA1039359A1 Electronic tuner for musical instruments |
| 09/19/1978 | US4115728 Frequency-comparing devices |
| 09/05/1978 | US4112359 Frequency transducer circuit with output calibration |
| 09/05/1978 | US4112358 Digital frequency measuring device |
| 08/29/1978 | US4110701 Method and apparatus for near-synchronization of a pair of oscillators, and measuring thereby |
| 08/22/1978 | US4109197 Prf detection system and method |
| 08/22/1978 | US4108166 Cardiac frequency measuring instrument |
| 08/15/1978 | US4107600 Adaptive frequency to digital converter system |
| 08/15/1978 | US4107585 Control devices |
| 08/01/1978 | US4104590 Digital device for measuring instantaneous parameter values of slowly varying processes |
| 08/01/1978 | US4104538 Digitally synthesized back-up frequency |
| 07/25/1978 | US4103290 Digital frequency display device |
| 07/04/1978 | US4099206 Piezoelectric device responsive to optical image for generating an electrical signal |
| 07/04/1978 | US4099048 Count logic circuit |
| 06/27/1978 | US4097812 Frequency selective detector circuit |
| 06/27/1978 | US4097798 Oscilloscope sweep rate indicator system |
| 06/13/1978 | US4095178 Tachometer circuit |
| 06/06/1978 | US4093989 Spectrum analyzer using digital filters |
| 06/06/1978 | US4093850 Ratemeter which calculates the reciprocal of the period |
| 05/30/1978 | US4092499 Apparatus for detecting a voice frequency signal |
| 05/16/1978 | US4090126 Frequency marker generator |
| 05/16/1978 | US4090090 Automatic transfer control device and frequency monitor |
| 05/09/1978 | US4088948 Single tone technique for measuring IM distortion |
| 04/11/1978 | US4084245 Arrangement for statistical signal analysis |
| 03/28/1978 | US4081694 Circuit for detecting the occurrence of a predetermined input frequency |
| 03/21/1978 | US4080589 Error density detector |
| 03/14/1978 | US4079325 Microwave frequency discriminator |
| 03/14/1978 | US4079280 Quartz resonator cut to compensate for static and dynamic thermal transients |
| 03/07/1978 | US4078255 Sequence generator having amplitudes and phases of spectral components randomly distributed |
| 03/07/1978 | US4078233 Analog to digital converter circuit with gain ranging feedback |
| 02/14/1978 | US4074201 Signal analyzer with noise estimation and signal to noise readout |
| 02/14/1978 | US4074191 Frequency measuring device for telecommunication systems |
| 02/14/1978 | US4074190 Signal measuring apparatus |
| 02/14/1978 | US4073432 Circuit arrangement for determining the average value of a frequency |
| 02/07/1978 | US4072364 Compensating circuit arrangement in a wheel anti-skid brake control system to obtain corresponding measured values of the duration of the half cycle alternations of a wheel generated voltage |
| 01/24/1978 | US4070618 Digital phase and frequency meter |
| 01/17/1978 | US4069468 Doppler spectral measurement |
| 01/10/1978 | US4068180 Methods and apparatus for enhancing resolution in pulse analysis |
| 01/10/1978 | US4068176 Direct reading sinad meter |
| 01/10/1978 | US4068171 Frequency comparator |