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8982668 Semiconductor device and method of forming same for correlation detection  
In an embodiment a semiconductor device correlates a received signal with a known pattern. A correlation output is used as a basis for forming a confidence reference level. The confidence...
8954173 Method and apparatus for profiling and identifying the source of a signal  
A method and apparatus for profiling and identifying the source of a signal is provided. A first method includes receiving a signal produced by a known source and creating a matrix of wavelet...
8787112 Seismic data apparatus and methods  
Methods and apparatus are provided related to seismic sensor data. Seismic sensor signaling is digitally sampled in accordance with a local clock and without synchronization to standardized time....
8724428 Process for separating data recorded during a continuous data acquisition seismic survey  
Method for separating signals recorded by a seismic receiver and generated with at least two vibratory seismic sources driven with no listening time. The method includes receiving seismic data...
7660198 Passive seismic event detection  
A method of identifying passive seismic events in seismic data that contains at least first seismic data traces acquired at a first seismic receiver and second seismic data traces acquired at a...
7508733 High-frequency processing of seismic vibrator data  
A method of processing seismic data obtained using a seismic vibrator that includes estimating travel times of direct wave arrivals between the seismic vibrator and an array of seismic receiver...
7260021 Method of harmonic noise attenuation in correlated sweep data  
The present invention provides a method for harmonic noise attenuation in correlated sweep data in seismic exploration. The method includes forming a plurality of correlation data subsets using a...
6934219 Methods and systems for acquiring seismic data  
Methods and systems are provided for acquiring seismic data. Data are collected representing acoustic signals received from the Earth at distinct geographic locations. Data representing an ambient...
6891776 Vibrator sweep shaping method  
This invention relates to improved methods to generate shaped sweeps, and for the acquisition of vibroseis data with a shaped pilot sweep.
6868037 Use of drill bit energy for tomographic modeling of near surface layers  
A method for tomographic modeling of seismic wave travel times from well drilling records generated by drill string vibrations during drilling and identifying in the recorded vibration at least...
6791900 Method of calculating a throw volume for quantitative fault analysis  
A method of calculating a throw volume corresponding to a seismic data volume. A range of time shifts and a search direction for the seismic data volume are selected. A data location separation...
6631783 Mapping reservoir characteristics using earth's nonlinearity as a seismic attribute  
This invention relates to mapping the hydrocarbon reservoir characteristics by mapping the reservoir formations that display dynamic elastic nonlinearity responses to the seismic signals. The main...
5426618 Method of high resolution and high SNR data acquisition for probing using pulse-compression  
Excellent likeness of impulse response function ro (t) of a given linear space is obtained by exciting the space through a transmitting transducer with a compressible probing signal x(t) which is...
5347494 Shaped-sweep technology  
A method for producing simple seismic wavelet shapes with minimal side lobe energy for use as reference signals for seismic vibrators is disclosed.
5241513 Correlation system for nonlinear vibratory signals  
Seismic data is cross correlated with a correlation reference which is an amplitude modified version of a nonlinear sweep. The amplitude modification provides both deboost and tapering.
5111399 Seismic apparatus and method including use of transputers for real time processing of data  
A seismic processing apparatus comprises a plurality of processing modules (12), each module comprising a transputer (T) and a transversal filter (TF) with these transputers of the modules...
4885711 Data processing  
A method for removing noise from seismic wiggle traces is provided. Data points from the seismic traces are selected for which amplitude and derivative values are determined. The derivative values...
4799201 Methods and apparatus for reducing correlation sidelobe interference in seismic profiling systems  
In seismic profiling systems utilizing sweeps of signals which change in repetition frequency during the transmission interval, interference results from a spurious correlation against an...
4750156 Noise suppression during seismic exploration  
The system for suppressing an ambient noise signal which comtaminates a desired signal includes a noise pickup detector for detecting the ambient noise signal. A noise discriminator processes the...
4630242 Adaptive and non-adaptive method for estimating the earth's reflection sequence  
A method is disclosed for estimating the impulse response of the earth from Vibroseis data. Based on a time domain system identification approach, the earth's impulse response is estimated by...
4564927 Method and apparatus for testing seismic vibrators  
A method of seismic exploration, wherein one or more vibratory sources are employed to generate an input signal whose frequency varies as a function of time and wherein the signal is reflected and...
4397006 Cross trace coherent noise filtering for seismograms  
In seismic exploration windows from a pair of contiguous traces are used in a process which determines the coherent noise on a basis trace and removes this coherent noise from a prediction trace....
4246652 Seismic source signatured evaluation apparatus  
Apparatus is provided for determining the conformity of an energy pulse generated by a weight drop seismic source to a defined energy pulse characteristic in order that reflections associated with...
4208732 Apparatus and method for enhancement of the signal-to-noise ratio in seismic data  
In common depth point seismic exploration, seismic traces are corrected for normal moveout and stacked to form a composite trace. The composite trace is successively time shifted to provide a...
4206509 Method of enhancing seismic reflection signals for nonsurface-consistent static time shifts  
In common depth point (CDP) seismic exploration, a pilot trace is produced from the stacked trace for each CDP set of traces. The pilot trace is crosscorrelated with each trace of the CDP set...
4168485 Simultaneous use of pseudo-random control signals in vibrational exploration methods  
A method for deriving seismic information through the simultaneous operation of a plurality of vibrational seismic energy source systems such that the information produced by each source system...
4058791 Method and apparatus for processing seismic signals from low energy sources  
A system and method for carrying out seismic operations with low energy sources, which involves operating the source at spaced points along a seismic spread, the source points are spaced far...
4044356 Process and device for correlation for use in a doppler radar installation  
In a double correlation device incorporated in a radar installation for muring distance, the transmitted high-frequency signal is modulated, by frequency displacement, by a series of pseudo-random...
3903407 Method for correlating frequency-modulated signals  
Apparatus and method for correlating frequency-modulated signal wavetrains ith their return signal wavetrains which includes compensating for delay distortions in the signal while passing through...
3648227 CORRECTING SEISMIC TRACES FOR STATIC CORRECTIONS AND NORMAL MOVEOUT  
A technique for obtaining static corrections and normal moveout for a set of seismic traces. The total time shifts between all traces and a reference trace are obtained by cross-correlation. The...
3622967 OPTIMUM STACK  
Seismic traces are weighted and stacked to produce an estimated output trace having improved signal-to-noise ratio. Those traces having the highest signal-to-noise ratio are weighted more heavily....
3622966 WAVELET STANDARDIZATION  
Processes for improving seismic data whereby a plurality of seismograms is standardized to have the same generating wavelet. A reference seismogram is chosen and its autocorrelation is determined....
3599175 SYSTEM AND METHODS OF PROCESSING SEISMIC DATA AND THE LIKE  
This invention discloses data processing system embodiments and methods for analyzing a set of seismic signals, which embodiments and methods are useful for processing other sets of signals of...
3550074 METHOD OF DETERMINING THE STATIC SHIFT BETWEEN GEOPHYSICAL SIGNALS  
3530431 PRECISION HIGHLINE PICKUP REMOVAL FROM A RECORDED SEISMIC TRACE  
3525072 METHOD AND APPARATUS FOR PROCESSING SEISMIC DATA IN THE FIELD  
3399300 Computing device including an electrical delay line with a plurality of taps each connected to a potentiometric network which is controlled by a strip element  
3394343 Method for determining travel time of a signal in continuous-wave seismic prospecting  
3366783 Computing device for seismic signals  
3359409 Correlation function apparatus  
3354297 Apparatus for measuring dynamic characteristics of systems by crosscorrelation  
3346068 Focusing and scanning either or both of a plurality of seismic sources and seismometers to produce an improved seismic record  
3339176 Discriminating primary and multiple seismic reflections  
3319229 Signal recognition device  
3307145 Method and apparatus for compiling, compositing, correlating and normalizing seismographic data  
3297981 Method and apparatus for correlating and normalizing signals  
3219971 Method and apparatus for maintaining phase relation  
3056945 Processing seismic traces and apparatus therefor  
3047836 Apparatus for processing seismic data  
3030021 Computing apparatus  

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