| Patents for G01R 23 - Arrangements for measuring frequencies; Arrangements for analysing frequency spectra (7,503) |
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| 01/03/1978 | US4067060 Transfer function measurement |
| 12/27/1977 | US4065714 Pulsed RF excited spectrometer having improved pulse width control |
| 12/27/1977 | US4065664 Floating point registers for programmed digital instruments |
| 12/13/1977 | US4063169 Method and apparatus for microwave frequency counting |
| 12/06/1977 | US4062020 Circuit arrangement for the frequency analysis of a signal |
| 11/22/1977 | US4059804 Frequency comparison circuit |
| 11/08/1977 | US4057756 Signal processors |
| 11/01/1977 | US4056817 System for monitoring a periodic function |
| 11/01/1977 | US4056778 Digital tachometer |
| 11/01/1977 | US4056287 Circuit arrangement for producing a digital speed signal corresponding to the angular velocity of a wheel from the half cycle duration of the sinusoidal waveform generated by the wheel |
| 10/18/1977 | US4054785 Spectrum analyzer with multiple operational modes |
| 10/04/1977 | US4052722 Traffic radar and apparatus therefor |
| 10/04/1977 | US4052676 Digital-analog frequency error signaling |
| 09/27/1977 | US4051434 Digital frequency measuring circuitry |
| 09/27/1977 | US4051433 Signal responsive burst period timer and counter for laser doppler velocimetry and the like |
| 09/20/1977 | US4050026 Device for frequency discrimination of electrical signals |
| 09/20/1977 | US4050024 Sideband detector |
| 09/13/1977 | US4048568 Wide operating frequency range superheterodyne fm noise analyzer |
| 09/13/1977 | US4048559 Method and apparatus for testing microwave repeaters for im distortion |
| 09/06/1977 | US4047114 Digital detector |
| 09/06/1977 | US4047002 Laplace transform system |
| 08/30/1977 | US4045731 Filter having an automatically controlled variable cut-off frequency |
| 08/09/1977 | US4041387 Apparatus and method for measuring the frequency of a sweeping signal |
| 07/19/1977 | US4037152 Frequency indicating system |
| 07/19/1977 | US4037151 Apparatus for measuring the period and frequency of a signal |
| 07/05/1977 | US4034288 System for measuring the frequency of an electrical signal |
| 07/05/1977 | US4034191 Spectrometer means employing linear synthesized RF excitation |
| 06/28/1977 | US4032912 Intensity modulated display system |
| 06/28/1977 | US4032857 Filter circuit |
| 06/21/1977 | US4031464 Line power distortion detector |
| 06/21/1977 | US4031462 Frequency spectrum analyzer |
| 06/21/1977 | US4030998 Detection of short circuits |
| 06/07/1977 | US4028622 Selective intermodulation distortion measurement |
| 06/07/1977 | US4028587 Marker circuit |
| 05/31/1977 | US4027146 High speed accurate low frequency counter |
| 05/24/1977 | US4025868 Frequency digital converter |
| 05/17/1977 | US4024477 Received signal frequency indicating system |
| 05/17/1977 | US4024414 Electrical circuit means for detecting the frequency of input signals |
| 05/03/1977 | US4021653 Digital programmable tone detector |
| 04/26/1977 | US4020418 Apparatus for generating a digital count proportional to an input frequency |
| 03/29/1977 | US4015216 Frequency-voltage converter and a stabilized pulse generator using it |
| 03/08/1977 | US4011502 Logarithmic ratemeter with bistable signal comparison |
| 02/22/1977 | US4009402 Time expander circuit for a frequency-to-digital converter |
| 01/25/1977 | US4005364 Digital circuit for measuring relative frequency in separate pulse trains |
| 01/18/1977 | US4004137 Readout apparatus for frequency or period-analog measuring signals |
| 01/11/1977 | US4002971 Wide operating frequency range transmission line discriminator |
| 01/11/1977 | US4002970 Optimum threshold transmission line discriminator |
| 01/11/1977 | US4002969 Optimum length transmission line discriminator with low noise detector |
| 01/04/1977 | US4001695 Automatic deviation analysis meter |
| 01/04/1977 | US4001680 Device for measuring small frequency differencies |
| 12/21/1976 | US3999136 Pulse repetition frequency detector |
| 12/14/1976 | US3997798 Or pulse gaps whose duration is shorter than a given test period t(p) from a sequence of digital pulses present at the input end |
| 12/14/1976 | US3997764 Method for the conversion of a frequency into a number |
| 12/07/1976 | US3996483 Multi-state semiconductor tachometer circuit |
| 11/23/1976 | US3993984 Electronic underfrequency relay |
| 11/16/1976 | US3992670 Frequency control circuits such as for use in modulation measurement |
| 11/16/1976 | US3992660 Frequency-current conversion circuit |
| 11/09/1976 | US3991365 Instantaneous frequency measurement system |
| 11/09/1976 | US3991301 Logarithmic frequency to voltage converter |
| 11/02/1976 | US3990007 Programmable frequency detector |
| 10/26/1976 | US3988671 Method and apparatus for colinear acousto-optic RF spectrum analysis |
| 10/19/1976 | US3987365 Digital frequency comparator circuit |
| 10/05/1976 | US3984773 Pulse counting-rate meter |
| 10/05/1976 | US3984770 Frequency measurement using phase continuous frequency switching |
| 10/05/1976 | US3984769 Mixed-base intercept receiver |
| 10/05/1976 | US3984669 Fully digital spectrum analyzer using time compression and Discrete Fourier Transform techniques |
| 09/28/1976 | US3983497 Phase locked loop |
| 09/28/1976 | US3983491 Television channel indicator |
| 09/28/1976 | US3983480 Calibration circuit and method |
| 09/14/1976 | US3980867 Traffic signal loop monitoring system |
| 08/31/1976 | US3978403 Automatic tracking signal analyzer |
| 08/31/1976 | US3978401 Distortion measurement system |
| 08/31/1976 | US3978322 Measurement system for timer |
| 08/24/1976 | US3977002 Tracking filter for frequency measurement in a Doppler type navigation guidance system or the like |
| 08/24/1976 | US3976863 Optimal decoder for non-stationary signals |
| 08/17/1976 | US3975587 Digital vocoder |
| 08/03/1976 | US3973190 Infralow frequency transfer function analyzer |
| 07/27/1976 | US3971994 Frequency comparison circuit |
| 07/13/1976 | US3969705 Spectrum analyzer having means for transient signal analysis |
| 07/06/1976 | US3968431 Measuring repetition rate |
| 06/29/1976 | US3967210 Multimode and multistate ladder oscillator and frequency recognition device |
| 06/29/1976 | US3965877 Frequency to voltage converters |
| 06/22/1976 | US3965438 Frequency locking system for a voltage controlled sweep frequency oscillator |
| 06/22/1976 | US3965417 Coherent component magnitude detector |
| 05/11/1976 | US3956706 Miniaturized millimeter wave instantaneous frequency discriminator |
| 05/11/1976 | US3956685 Frequency responsive circuit |
| 05/04/1976 | US3955143 Single sideband generator of bi-level signals |
| 05/04/1976 | US3955137 Adjustable frequency scanning signal processor |
| 04/13/1976 | US3950699 Device for measuring a signal having a very high noise level |
| 04/13/1976 | US3950694 Installation for the detection and processing of electrical signals |
| 04/06/1976 | US3949307 Circuit arrangement for digital frequency indication in a radio receiver |
| 03/30/1976 | US3947775 Phase and frequency comparator |
| 03/23/1976 | US3946209 High frequency counter having signal level sensitivity |
| 03/02/1976 | US3942109 Sweeping spectrum analyzer |
| 02/24/1976 | US3940715 Distortion measurement system |
| 02/17/1976 | US3939411 Instantaneous frequency measurement system |
| 02/17/1976 | US3938394 Combination balance analyzer and vibration spectrum analyzer |
| 02/03/1976 | US3936757 Automatic gate control system |
| 02/03/1976 | US3936674 Rate signal generator circuit |
| 01/27/1976 | US3935539 A-C signal multiplying circuit by a ratio of whole numbers the numerator of which is greater than one and greater than the denominator |