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Class Information
Number: 367/65
Name: Communications, electrical: acoustic wave systems and devices > Seismic prospecting > Land-reflection type > Signal analysis and/or correction > Gain control
Description: Subject matter wherein the amplification or attenuation of an amplifier is variable.










Sub-classes under this class:

Class Number Class Name Patents
367/66 Analog/digital compatible systems 15
367/67 Digital 39


Patents under this class:

Patent Number Title Of Patent Date Issued
8494815 Method of designing a sound waveguide surface Jul. 23, 2013
8422545 Adaptive equalizer and adaptive equalizing method Apr. 16, 2013
8107316 Controlled source imbalance apparatus, systems, and methods Jan. 31, 2012
7885144 Time-dependant gain control for an amplifier used in receiving echoes Feb. 8, 2011
7778110 Processing seismic data representative of the acceleration wavefield Aug. 17, 2010
7752482 Hybrid parallel/serial bus interface Jul. 6, 2010
7475273 Hybrid parallel/serial bus interface Jan. 6, 2009
6984561 Method for making high density nonvolatile memory Jan. 10, 2006
6363343 Automatic gain control Mar. 26, 2002
5999485 Method of distinguishing geological sequences and their boundaries Dec. 7, 1999
5563847 Seismic signal acquisition method and device Oct. 8, 1996
5189644 Removal of amplitude aliasing effect from seismic data Feb. 23, 1993
4999817 Programmable gain control for rotating transducer ultrasonic tools Mar. 12, 1991
4736300 Automatic gain control of formation measurements by varying induced current flow Apr. 5, 1988
4727521 Seismic amplifier means and method Feb. 23, 1988
4706226 Seismic line amplifier Nov. 10, 1987
4691307 AGC circuit for televiewer Sep. 1, 1987
4646275 Dynamic range compression for variable area or wiggle trace display method and apparatus Feb. 24, 1987
4636993 Automatic gain control for seismic data Jan. 13, 1987
4611342 Digital voice compression having a digitally controlled AGC circuit and means for including the true gain in the compressed data Sep. 9, 1986
4610006 Automatic control system for acoustic logging Sep. 2, 1986
4601023 Automatic gain control in seismic data samples Jul. 15, 1986
4592033 Apparatus for improving the data transmission rate in a telemetry system May. 27, 1986
4581725 Method and system for gain selection Apr. 8, 1986
4554648 Electronic earth seismic noise measuring method Nov. 19, 1985
4553133 Serial floating point formatter Nov. 12, 1985
4527148 Analog-digital converter Jul. 2, 1985
4514809 Dynamic range control of electrode pad current in well logging tools Apr. 30, 1985
4412207 Digital induction logging tool including a floating point A/D Oct. 25, 1983
4399416 Floating point amplifier Aug. 16, 1983
4391124 Electroacoustic transducer calibration method and apparatus Jul. 5, 1983
4357577 Instantaneous floating point amplifier Nov. 2, 1982
4339810 Method of compensating seismic data for effects of frequency dependent attenuation Jul. 13, 1982
4321675 Method and apparatus for increasing the dynamic range of a data acquisition system at low frequencies without reducing high frequency gain Mar. 23, 1982
4319346 Acoustic frequency spectrum logging Mar. 9, 1982
4242741 Floating shunt seismic amplifier Dec. 30, 1980
4241428 Line compensated seismic amplifier Dec. 23, 1980
4232379 Automatic balancing system for seismic equipment Nov. 4, 1980
4140994 Method and apparatus for acoustic well logging of earth boreholes Feb. 20, 1979
3958216 Two-wire multiplex seismic recording system May. 18, 1976
3939468 Differential charge amplifier for marine seismic applications Feb. 17, 1976











 
 
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