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Africa
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1-20 OF 747 RESULTS FOR
wiener filters
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Journal Article
Adaptive multiple subtraction with wavelet-based complex unary Wiener filters Available to Purchase
Sergi Ventosa, Sylvain Le Roy, Iréne Huard, Antonio Pica, Hérald Rabeson, Patrice Ricarte, Laurent Duval
Journal: Geophysics
Publisher: Society of Exploration Geophysicists
Published: 18 September 2012
Geophysics (2012) 77 (6): V183–V192.
... tractable narrow-band filter designs, using a 1D complex wavelet frame. This decomposition enables a single-pass adaptive subtraction via complex, single-sample (unary) Wiener filters, consistently estimated on overlapping windows in a complex wavelet transformed domain. Each unary filter compensates...
Journal Article
Application of frequency-dependent multichannel Wiener filters to detect events in 2D three-component seismometer arrays Available to Purchase
Journal: Geophysics
Publisher: Society of Exploration Geophysicists
Published: 25 November 2009
Geophysics (2009) 74 (6): V133–V141.
... local earthquakes will benefit from reduced noise levels and the ability to detect smaller events will be increased. We propose a frequency-dependent multichannel Wiener filtering technique with linear constraints that uses an adaptive least-squares method to remove coherent noise in seismic array data...
Journal Article
Application of multichannel Wiener filters to the suppression of ambient seismic noise in passive seismic arrays Available to Purchase
Journal: The Leading Edge
Publisher: Society of Exploration Geophysicists
Published: 01 February 2008
The Leading Edge (2008) 27 (2): 232–238.
... plane-wave propagation. Both methods perform poorly when the waveform changes significantly between stations of the array, as might be caused, for example, by differences in site response. In this article, we present a multichannel Wiener filtering technique, which allows the removal of coherent...
Journal Article
CONVERSION OF HEAD-WAVE FIELDS BY THE WIENER FILTERS Available to Purchase
Journal: Russian Geology and Geophysics
Publisher: Novosibirsk State University
Published: 01 April 1998
Russ. Geol. Geophys. (1998) 39 (4): 548–559.
...V. S. Seleznev; A. F. Emanov Some questions of automated processing of head waves in observation systems with multiple coverage of waves are considered. Potentialities for perfecting the algorithms for conversion of head-wave fields to dynamic time sections have been investigated. The Wiener filter...
Journal Article
Fast algorithms to design discrete Wiener filters in lag and length coordinates Available to Purchase
Journal: Geophysics
Publisher: Society of Exploration Geophysicists
Published: 01 June 1996
Geophysics (1996) 61 (3): 882–890.
...Milton J. Porsani Abstract Two recursive algorithms for designing discrete Wiener filters for wavelets of different phase characteristics are the Simpson and the Manolakis recursions. Both procedures are efficient; however, both recursions work with a prefixed length filter. Two fast algorithms...
Journal Article
Resolution performance of Wiener filters Available to Purchase
Journal: Geophysics
Publisher: Society of Exploration Geophysicists
Published: 01 July 1983
Geophysics (1983) 48 (7): 887–899.
...Samuel H. Bickel; D. R. Martinez Abstract When Wiener filters are applied to seismic data, the bandwidth of noise increases along with the bandwidth of the signal. Thus the signal-to-noise ratio is degraded. To reduce signal ambiguity it is common practice to prewhiten the Wiener filter...
Journal Article
Detection of bodies with specified density-magnetization ratios by the use of multichannel Wiener filters Available to Purchase
Journal: Geophysics
Publisher: Society of Exploration Geophysicists
Published: 01 August 1975
Geophysics (1975) 40 (4): 617–620.
...P. J. Gunn Abstract It is possible to design multichannel Wiener filters to simultaneously process gravity and magnetic data in profile form so as to produce diagnostic rectangular wave outputs only if anomalies due to bodies with a specified density-magnetization ratio are input. This method has...
Journal Article
The Determination Of Digital Wiener Filters By Means Of Gradient Methods Available to Purchase
Journal: Geophysics
Publisher: Society of Exploration Geophysicists
Published: 01 April 1973
Geophysics (1973) 38 (2): 310–326.
...R. J. Wang; S. Treitel Abstract The normal equations for the discrete Wiener filter are conventionally solved with Levinson's algorithm. The resultant solutions are exact except for numerical roundoff. In many instances, approximate rather than exact solutions satisfy seismologists' requirements...
Journal Article
Computer-designed Wiener Filters For Seismic Data Available to Purchase
Journal: Geophysics
Publisher: Society of Exploration Geophysicists
Published: 01 April 1972
Geophysics (1972) 37 (2): 235–259.
... and the frequency content of individual signal and noise wavelets (events) on these traces. Therefore, a so-called “wavelet” Wiener filter is introduced which suppresses “noise” wavelets and enhances “signal” wavelets; this filter can be contrasted with an ordinary Wiener filter which discriminates between signal...
Journal Article
The complex Wiener filter Available to Purchase
Journal: Geophysics
Publisher: Society of Exploration Geophysicists
Published: 01 April 1974
Geophysics (1974) 39 (2): 169–173.
...Sven Treitel Abstract The ordinary time or space domain Wiener filter is conventionally obtained for real-valued inputs and real-valued desired outputs. Situations exist for which these variables are complex-valued.It is possible to develop a solution for the resulting complex Wiener filter...
Journal Article
The complex wiener filter; discussion Available to Purchase
Journal: Geophysics
Publisher: Society of Exploration Geophysicists
Published: 01 April 1975
Geophysics (1975) 40 (2): 358–359.
... normal equations were also derived: ∑ m = 0 N f N ( m Δ t ) R x , x [ ( n − m ) Δ t ] = R x , y ( d ) ( n Δ t ) for n = 0, 1, …, N . In (1a), R x,x (t) is the autocorrelation function of a complex input signal x ( t ), f N ( t ) is the complex least-squares filter of duration ( N + 1)Δ t, y (d) ( t...
Journal Article
Gravity anomaly separation by wiener filtering Available to Purchase
Journal: Geophysics
Publisher: Society of Exploration Geophysicists
Published: 01 May 1990
Geophysics (1990) 55 (5): 539–548.
...R. S. Pawlowski; R. O. Hansen Abstract We introduce a gravity anomaly separation method based on frequency-domain Wiener filtering. Gravity anomaly separation can be effected by such wavelength filtering when the gravity response from the geologic feature of interest (the signal) dominates one...
Journal Article
Robust deconvolution by modified Wiener filtering Available to Purchase
Journal: Geophysics
Publisher: Society of Exploration Geophysicists
Published: 01 February 1988
Geophysics (1988) 53 (2): 186–191.
...A. T. Walden Abstract Deconvolution in the presence of additive noise is a well known problem for which there exists a Wiener filter which spectrally whitens while also suppressing the noise. A simple variant of this standard Wiener filter incorporates a parameter p which is intended to allow...
Journal Article
Reduction to the pole at low latitudes by Wiener filtering Available to Purchase
Journal: Geophysics
Publisher: Society of Exploration Geophysicists
Published: 01 December 1989
Geophysics (1989) 54 (12): 1607–1613.
Journal Article
The determination of optimum gate lengths for time-varying wiener filtering Available to Purchase
Journal: Geophysics
Publisher: Society of Exploration Geophysicists
Published: 01 October 1969
Geophysics (1969) 34 (5): 683–695.
... to the calculation of time-varying Wiener filters. The Berndt and Cooper technique produces an upper bound for the mean-square error between the true and a given approximated time-varying correlation function. The minimization of this upper bound leads to a relation which enables one to establish gate lengths...
Journal Article
Measurement of interstation phase and group velocities and Q using Wiener filtering Available to Purchase
Publisher: Seismological Society of America
Published: 01 February 1982
Bulletin of the Seismological Society of America (1982) 72 (1): 73–91.
...Steven R. Taylor; M. Nafi Toksöz abstract A method for calculating interstation phase and group velocities and attenuation coefficients using a Wiener (least-squares) filtering technique is presented. The interstation Green's (or transfer) function is estimated from surface wave data from two...
Journal Article
Ground-roll attenuation based on Wiener filtering and benefits of time-frequency imaging Available to Purchase
Journal: The Leading Edge
Publisher: Society of Exploration Geophysicists
Published: 01 February 2008
The Leading Edge (2008) 27 (2): 206–209.
... of these factors has lead to searching for alternative methods that are based on estimation of the noise and its attenuation from data by arithmetical subtraction. Wiener filters have a wide usage in different seismic applications and have been the subject of many papers including filter estimation and mostly...
Journal Article
Improving explicit seismic depth migration with a stabilizing Wiener filter and spatial resampling Available to Purchase
Journal: Geophysics
Publisher: Society of Exploration Geophysicists
Published: 26 May 2006
Geophysics (2006) 71 (3): S111–S120.
... is addressed by splitting the operator into two parts, one to control phase accuracy and a second to improve stability. The first partial operator is simply a windowed version of the exact operator for a half step. The second partial operator is designed, using the Wiener filter method, as a band-limited...
Journal Article
Improved MAX-MIN method to estimate total magnetization direction using Wiener filtering Available to Purchase
Journal: Geophysics
Publisher: Society of Exploration Geophysicists
Published: 12 October 2022
Geophysics (2022) 87 (6): G137–G156.
... is the primary cause of the inaccuracy in estimation results. We have improved the MAX-MIN method using Wiener filtering based on the principle of least-mean-squares deviation. The k -means clustering algorithm clusters points that are as closely connected as possible, while ensuring that the distances between...
Image
In each row, the Wiener filters turn a test-set real acoustic (elastic) gat... Available to Purchase
Published: 28 April 2023
Figure 7. In each row, the Wiener filters turn a test-set real acoustic (elastic) gather into its elastic (acoustic) analog. The real gathers used here are the same as those shown in Figure 6 . The fake gathers show large matching errors.
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