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Class Information
Number: 367/45
Name: Communications, electrical: acoustic wave systems and devices > Seismic prospecting > Land-reflection type > Signal analysis and/or correction > Filters > Adaptive filters
Description: Subject matter wherein the signal selecting characteristics of the filter are varied by the signal fed into the filter itself.










Patents under this class:
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Patent Number Title Of Patent Date Issued
8644110 Methods and systems for spurious cancellation in seismic signal detection Feb. 4, 2014
8619897 Method and apparatus of frequency domain echo canceller Dec. 31, 2013
8559275 System and method for determining a frequency sweep for seismic analysis Oct. 15, 2013
8553497 Removal of surface-wave noise in seismic data Oct. 8, 2013
8064288 Method for passive seismic emission tomography using adaptive velocity filter Nov. 22, 2011
8054711 Method and apparatus for attenuation wind noise in seismic data Nov. 8, 2011
7830746 Method for treating seismic data corresponding to acquisitions obtained for a common zone by means of underwater seismic receivers and by means of surface receivers Nov. 9, 2010
7660200 Method for coherence-filtering of acoustic array signal Feb. 9, 2010
7636051 Status monitor apparatus Dec. 22, 2009
7616525 Method and apparatus for attenuation wind noise in seismic data Nov. 10, 2009
7555389 Creating an Absorption Parameter Model Jun. 30, 2009
7535955 Methods, algorithms, software, architectures, systems and circuitry for adaptive filtering and/or minimizing a sequence detector error rate May. 19, 2009
7447114 Non-linear seismic trace matching to well logs Nov. 4, 2008
7433265 Converted wave energy removal from seismic data Oct. 7, 2008
7327633 Systems and methods for enhancing low-frequency content in vibroseis acquisition Feb. 5, 2008
7089119 Acoustic signal processing method using array coherency Aug. 8, 2006
6801473 Method for estimating and removing artifact noise from seismic data Oct. 5, 2004
6757217 Method for time-aligning multiple offset seismic data volumes Jun. 29, 2004
6691073 Adaptive state space signal separation, discrimination and recovery Feb. 10, 2004
6651007 Adaptive seismic noise and interference attenuation method Nov. 18, 2003
6636816 Vector signal analysis method and apparatus therefor Oct. 21, 2003
6519205 Ground roll attenuation method Feb. 11, 2003
6446009 Seismic data acquisition and method for spatially filtering seismic data Sep. 3, 2002
6446008 Adaptive seismic noise and interference attenuation method Sep. 3, 2002
6373396 Method for predicting seismic events Apr. 16, 2002
5986973 Energy minimization in surface multiple attenuation Nov. 16, 1999
5982706 Method and system for determining normal moveout parameters for long offset seismic survey signals Nov. 9, 1999
5971095 Noise filtering method for seismic data Oct. 26, 1999
5781502 Method and device for filtering elliptical waves propagating in a medium Jul. 14, 1998
5781503 Method for attenuating surface wavetrains in seismic data Jul. 14, 1998
5771203 Seismic prospection method with application of a self-deconvoluted prediction error filter Jun. 23, 1998
5684754 Method and system for correcting seismic traces for normal move-out stretch effects Nov. 4, 1997
5594706 Downhole processing of sonic waveform information Jan. 14, 1997
5572483 Method of reducing noise in seismic signals by adaptive filtering of a noise reference Nov. 5, 1996
5555530 Method for improving signal to noise ratio Sep. 10, 1996
5528555 System and method for compensating for towed array motion induced errors Jun. 18, 1996
5448531 Method for attenuating coherent noise in marine seismic data Sep. 5, 1995
5349527 Method of seismic time migration using a massively parallel computer Sep. 20, 1994
5251183 Apparatus and method for marine seismic surveying utilizing adaptive signal processing Oct. 5, 1993
5229765 SP noise cancellation technique Jul. 20, 1993
5209237 Method and apparatus for detecting a signal from a noisy environment and fetal heartbeat obtaining method May. 11, 1993
5191526 Method for removing coherent noise from seismic data Mar. 2, 1993
5060202 Method for removing coherent noise from seismic data through T-K filtering Oct. 22, 1991
5050226 Ultrasonic echographic imaging device utilizing an improved adaptive filter Sep. 17, 1991
5050130 Signal processing to enable utilization of a rig reference sensor with a drill bit seismic source Sep. 17, 1991
4967401 Method of acquiring and interpreting seismic data to obtain lithological parameters Oct. 30, 1990
4964087 Seismic processing and imaging with a drill-bit source Oct. 16, 1990
4926391 Signal processing to enable utilization of a rig reference sensor with a drill bit seismic source May. 15, 1990
4890264 Seismic exploration method and apparatus for cancelling non-uniformly distributed noise Dec. 26, 1989
4857867 Method and apparatus for locking the frequency and phase of a local oscillator Aug. 15, 1989

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