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Class Information
Number: 324/76.45
Name: Electricity: measuring and testing > Measuring, testing, or sensing electricity, per se > Frequency of cyclic current or voltage (e.g., cyclic counting etc.) > Frequency comparison, (e.g., heterodyne, etc.) > With filtering > Bandpass
Description: Subject matter that limits the range of frequencies that will be passed through a device.

Patents under this class:

Patent Number Title Of Patent Date Issued
8705675 Device and method for receiving RF signals based on heterodyne architecture using complex IF subsampling Apr. 22, 2014
8223928 Method of and a device for quantifying a tone signal received in a telecommunications network Jul. 17, 2012
7982451 Sensing instrument Jul. 19, 2011
6777921 Analog filter with built-in self test Aug. 17, 2004
6356067 Wide band signal analyzer with wide band and narrow band signal processors Mar. 12, 2002
6060837 Method of and apparatus for minimizing plasma instability in an rf processor May. 9, 2000
5877606 Starting of synchronous machine without rotor position or speed measurement Mar. 2, 1999
5706202 Frequency spectrum analyzing apparatus and transmitter characteristics measuring apparatus using the same Jan. 6, 1998
5612617 Frequency detection circuit Mar. 18, 1997
4914380 Signal receiving arrangement Apr. 3, 1990
4859933 Narrowband signal recognition for EMI measurement Aug. 22, 1989
4812743 Method and apparatus for detecting a narrowband signal Mar. 14, 1989
4810960 Measuring adjacent channel power Mar. 7, 1989
4802225 Analysis of non-sinusoidal waveforms Jan. 31, 1989
4802098 Digital bandpass oscilloscope Jan. 31, 1989
4797931 Audio frequency signal identification apparatus Jan. 10, 1989
4785474 Emergency signal warning system Nov. 15, 1988
4757253 Circuit arrangement for frequency analysis of received signals which lie in a wide overall frequency band Jul. 12, 1988
4720674 Doppler signal analyzing apparatus Jan. 19, 1988
4710702 Heterodyne type signal-measuring method and a measuring apparatus including automatic detuning correction means Dec. 1, 1987
4628255 AGC technique for spectrum analyzers Dec. 9, 1986
4599567 Signal representation generator Jul. 8, 1986
4578638 Spectrum analyzer Mar. 25, 1986
4563638 Time selective frequency detection by time selective channel to channel energy comparison Jan. 7, 1986
4535286 Radio frequency receiver Aug. 13, 1985
4511917 Determining agreement between an analysis signal and at least one reference signal Apr. 16, 1985
4415854 Microwave spectrum analyzer with a synthesized local oscillator Nov. 15, 1983
4395762 Frequency counter Jul. 26, 1983
4380732 Signal spectrum display apparatus Apr. 19, 1983
4361804 Electrical test instruments Nov. 30, 1982
4339711 Spectrum displaying apparatus for multichannel signals Jul. 13, 1982
4307340 Spectrum display apparatus Dec. 22, 1981
4305159 Compressive receiver Dec. 8, 1981
4131852 Single dispersive delay line compressive receiver Dec. 26, 1978
4074191 Frequency measuring device for telecommunication systems Feb. 14, 1978
4068171 Frequency comparator Jan. 10, 1978
4034299 Audio signal quality indicator Jul. 5, 1977
3986112 Novel technique for frequency detection utilizing switching filters Oct. 12, 1976
3955137 Adjustable frequency scanning signal processor May. 4, 1976
3934097 Multifrequency tone detection Jan. 20, 1976

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