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 |