Patents
Sitemap › G01 - Measuring; Testing › G01R - Measuring electric variables; Measuring magnetic variables › G01R 23 - Arrangements for measuring frequencies; Arrangements for analysing frequency spectra
Patents for G01R 23 - Arrangements for measuring frequencies; Arrangements for analysing frequency spectra (7,503)
01/1983
01/18/1983US4369404 Method and apparatus for the spectroscopic observation of particles
01/18/1983CA1139844A1 Circuit for measuring average period of periodic signal
12/1982
12/28/1982US4366399 Frequency discrimination circuit
12/07/1982US4363099 Method and system for measuring frequency deviation of low frequency signals
12/01/1982EP0065683A1 Method and circuit for measuring the frequency of an alternating electrical value
11/1982
11/30/1982US4361875 Multiple tone detector and locator
11/30/1982US4361837 Remote control circuit employing frequency/direct signal converters
11/23/1982US4360782 Maximum frequency detector
11/11/1982WO1982003912A1 Lensless spectrum analyser
11/09/1982US4358737 Digitally controlled bandwidth sampling filter-detector
11/09/1982US4358734 Methods and apparatuses for detecting the speed of an asynchronous motor
11/09/1982US4358733 Spectrum analyzer without distinct band-pass filter components
11/09/1982CA1135339A1 Digital frequency measuring circuitry
11/02/1982CA1134917A1 Ac to dc converter for antiskid system
10/1982
10/26/1982US4356448 Apparatus for measuring electrical or magnetic fields by absorption spectrum change
10/26/1982US4356445 Method and apparatus for driving air core meter movements
10/26/1982CA1134444A1 Method and device for discriminating difference frequency of two pulse trains
10/13/1982EP0009488B1 Arrangement for measuring the ratio between a number of events occurring after each other in a first and second series of events
10/12/1982US4354158 Circuit arrangement for generating a sampling pulse train for a periodic signal
10/06/1982EP0061853A1 Tone detection circuitry
09/1982
09/21/1982US4351032 Frequency sensing circuit
09/21/1982US4350952 Digital read-out meter circuit and tachometer with variable meter update rate using an up/down counter means
09/21/1982US4350950 Frequency measuring method and apparatus
09/15/1982EP0059773A1 Digital circuit delivering a binary signal whenever two signals have a predetermined frequency ratio, and its use in colour television receivers
09/14/1982US4349878 Arrangement for detecting disturbances influencing the network frequency in electric power supply systems and use of such arrangement in an adaptive automatic frequency control system for an electric power supply system
09/14/1982CA1131704A1 Self calibrating crystal controlled frequency counter method and apparatus
09/07/1982US4348735 Cyclotomic tone detector and locator
09/07/1982US4348074 Application of ion implantation to LiNbO3 integrated, optical spectrum analyzers
08/1982
08/25/1982EP0058282A1 Engine rotational speed measurement system
08/24/1982CA1130384A1 Frequency to digital converter
08/18/1982EP0058050A1 Measuring method
08/17/1982US4345206 Frequency and frequency error counting in test apparatus
08/10/1982US4344038 Low frequency tone detector
08/10/1982US4344029 Automatic IM distortion test selector
08/10/1982US4344028 Testing device for low-frequency amplifiers
07/1982
07/21/1982EP0056072A1 Multiplexer for single-octave data processor
07/20/1982US4340864 Frequency control system
07/20/1982US4340854 Distortion measurement system
07/13/1982US4339714 Probe having passive means transmitting an output signal by reactive coupling
07/13/1982US4339711 Spectrum displaying apparatus for multichannel signals
06/1982
06/29/1982CA1126865A1 Programmable digital tone detector
06/22/1982US4336497 Acceleration sensor
06/22/1982US4335596 Device for measuring the operation of a timepiece movement
06/15/1982CA1125870A1 Tone signal detectors
06/08/1982US4334273 Signal processing system using a digital technique
06/08/1982CA1125393A1 Digital signal detector
05/1982
05/25/1982US4331882 Method and means for detecting spurious electrical signals in an electrical power system
05/18/1982US4330746 Method and apparatus for measuring received Doppler cycles for a specified period of time
05/18/1982CA1123918A1 Frequency counting apparatus
05/05/1982EP0050744A2 Device for detecting the frequency drift of an oscillator circuit
05/04/1982US4328576 Wide band demodulator of phase modulated signals
05/04/1982CA1123056A1 Measuring device for a frequency analysis of signal levels over a wide range of frequencies
04/1982
04/27/1982US4327323 Comparator apparatus and process
04/27/1982US4326538 Method and apparatus for analysis of essentially periodic signal sequences
04/20/1982US4326261 Single tone detector
04/20/1982US4326256 Frequency discriminating circuit
04/20/1982CA1122275A1 Frequency deviation measuring and adjusting system
04/13/1982US4325023 Device for inspecting an individual high frequency signal selected according to frequency from a broad frequency band
04/13/1982US4325010 Battery state of charge indicator device
03/1982
03/31/1982EP0048638A2 Maximum frequency limiter
03/30/1982US4322806 Frequency response analyzer
03/30/1982US4322642 Frequency discriminating circuit
03/23/1982US4321548 Frequency-voltage and voltage-frequency converters
03/23/1982US4321547 Electronic discrimination circuitry for the highest frequency of a plurality of input signals
03/16/1982US4320529 Frequency counting apparatus
03/16/1982CA1120104A1 Digital spectrum analysers
03/09/1982US4319334 Frequency sensing device for reducing non-periodic components
02/1982
02/23/1982US4317223 RF Generator monitor circuit
02/23/1982CA1118843A1 Cardiac monitoring apparatus
02/09/1982CA1118057A1 Microprocessor controlled digital detector
02/02/1982US4313361 Digital frequency follower for electronic musical instruments
01/1982
01/26/1982US4313107 Tone signal detectors
01/12/1982US4310891 Frequency measuring apparatus
01/12/1982US4310800 Digital frequency measuring circuitry
01/12/1982US4310795 Circuit measuring average period of periodic signal
01/12/1982US4309909 Crystal stabilized voltage to frequency converter with digital calibration for flowmeters
01/12/1982CA1116238A1 Frequency measuring apparatus
01/05/1982CA1115812A1 Digital circuit generating a vital delay
12/1981
12/30/1981EP0042691A1 Digital indication type speedometer
12/23/1981EP0041968A1 A measuring device for measuring the carrier frequency of short duration pulses.
12/22/1981US4307340 Spectrum display apparatus
12/22/1981CA1114902A1 Frequency measuring apparatus
12/15/1981US4306310 Superheterodyne receiver frequency tracking circuit
12/15/1981US4306295 Arrangement for measuring the ratio between a number of events occurring after each other in a first and a second series of events
12/15/1981US4306186 Frequency marker display system
12/15/1981CA1114512A1 Arrangement for measuring the ratio between a number of events occurring after each other in a first and a second series of events
12/08/1981US4305159 Compressive receiver
12/01/1981US4303979 Frequency spectrum variation monitoring system
11/1981
11/24/1981US4302813 Method of controlling operation of rotary machines by diagnosing abnormal conditions
11/24/1981US4302738 Noise rejection circuitry for a frequency discriminator
11/24/1981US4302665 Circuit for measuring the duration of a pulse train, its use and circuit for its use
11/17/1981US4301405 Interval-to-rate converter
11/17/1981US4301404 Methods and apparatus for analyzing periodic waveforms
10/1981
10/27/1981US4297704 Phase sensitive spectrum analyzer
10/20/1981US4296374 Wideband digital spectrometer
10/13/1981US4295093 Spectrum analysers
10/13/1981CA1110762A1 Rotational speed indicating apparatus
10/01/1981WO1981002714A1 Selection stage of the ac signal having the greater amplitude
09/1981
09/22/1981US4291269 System and method for frequency discrimination
09/22/1981US4291268 Apparatus for driving a deflecting coil type meter
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