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Class Information
Number: 702/77
Name: Data processing: measuring, calibrating, or testing > Measurement system in a specific environment > Electrical signal parameter measurement system > Waveform analysis > Frequency > Frequency spectrum > Using fourier method
Description: Subject matter wherein the frequency spectrum is analyzed or determined using Fourier analysis or Fourier transform technique.










Patents under this class:
1 2 3 4 5 6 7

Patent Number Title Of Patent Date Issued
5600138 Remote sensing of modulated sources by undersampled methods Feb. 4, 1997
5594655 Method and apparatus for frequency triggering in digital oscilloscopes and the like Jan. 14, 1997
5590059 Position encoder system which utilites the fundamental frequency of a ruled scale on an object Dec. 31, 1996
5587966 Sonic well logging methods and apparatus for processing flexural wave in optimal frequency band Dec. 24, 1996
5586067 Support enhancing device and associated method Dec. 17, 1996
5586066 Surveillance of industrial processes with correlated parameters Dec. 17, 1996
5583784 Frequency analysis method Dec. 10, 1996
5579248 Method for removing borehole rugosity noise from well log data Nov. 26, 1996
5576975 Distance measuring method and a distance measuring apparatus Nov. 19, 1996
5576978 High resolution frequency analyzer and vector spectrum analyzer Nov. 19, 1996
5574646 Gear noise evalutation system Nov. 12, 1996
5572440 Motor vehicle vibrating system and method of controlling same Nov. 5, 1996
5557544 Spectrometer with dynamically coded components Sep. 17, 1996
5545988 Waveform signal processor with selective sampling Aug. 13, 1996
5545976 Gated spectrum analyzer Aug. 13, 1996
5535131 System for analyzing sound quality in automobile using musical intervals Jul. 9, 1996
5528134 AC power analyzer Jun. 18, 1996
5515300 Coherent signal power detector using higher-order statistics May. 7, 1996
5511422 Method and apparatus for analyzing and detecting faults in bearings and other rotating components that slip Apr. 30, 1996
5485395 Method for processing sampled data signals Jan. 16, 1996
5481503 Apparatus for and method of adaptively processing sonar data Jan. 2, 1996
5469375 Device for identifying the type of particle detected by a particle detecting device Nov. 21, 1995
5461329 Method and apparatus for generating motor current spectra to enhance motor system fault detection Oct. 24, 1995
5460034 Method for measuring and analyzing surface roughness on semiconductor laser etched facets Oct. 24, 1995
5420501 Frequency spectrum analyzer May. 30, 1995
5400265 Procedure for enhancing resolution of spectral information Mar. 21, 1995
5396440 Optimum calibration frequency determination Mar. 7, 1995
5390106 Analysis of disturbances in power systems Feb. 14, 1995
5365164 Harmonic analyzer and methods of constructing and utilizing same Nov. 15, 1994
5345409 Programmable digital signal processor system for processing electrical power signals Sep. 6, 1994
5323103 Frequency measurement receiver with means to resolve two folding frequencies of complex signals Jun. 21, 1994
5323337 Signal detector employing mean energy and variance of energy content comparison for noise detection Jun. 21, 1994
5301123 Zero crossing based spectrum analyzer and method Apr. 5, 1994
5293114 Frequency measurement receiver with means to resolve an ambiguity in multiple frequency estimation Mar. 8, 1994
5249150 Process and circuit to determine estimates of the instantaneous value of parameters of at least one sinusoidal signal with constant and known frequency which is an additive component of a meas Sep. 28, 1993
5235287 Frequency measurement receiver with bandwidth improvement through phase shifted sampling of real signals using sampling rate selection Aug. 10, 1993
5198748 Frequency measurement receiver with bandwidth improvement through synchronized phase shifted sampling Mar. 30, 1993
5185701 Method for determining frequency components in a vehicle crash Feb. 9, 1993
5177691 Measuring velocity of a target by Doppler shift, using improvements in calculating discrete Fourier transform Jan. 5, 1993
5162723 Sampling signal analyzer Nov. 10, 1992
5109188 Instantaneous frequency measurement receiver with bandwidth improvement through phase shifted sampling of real signals Apr. 28, 1992
5099243 Digital frequency measurement receiver with bandwidth improvement through multiple sampling of complex signals Mar. 24, 1992
5099194 Digital frequency measurement receiver with bandwidth improvement through multiple sampling of real signals Mar. 24, 1992
5075619 Method and apparatus for measuring the frequency of a spectral line Dec. 24, 1991
5061890 Method and apparatus for digitally measuring electrical energy consumption Oct. 29, 1991
5049858 Intrusion detection system Sep. 17, 1991
4995006 Apparatus and method for low-pass equivalent processing Feb. 19, 1991
4991128 Apparatus and methods for spectral analysis of electrical materials, components and devices Feb. 5, 1991
4965757 Process and device for decoding a code signal Oct. 23, 1990
4964055 Hand-held power system harmonic distortion meter with selective activation of display Oct. 16, 1990

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