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