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Document Title 

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 
Highfrequency 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 pulsecompression
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 
Shapedsweep 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 nonadaptive 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 signaltonoise 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 nonsurfaceconsistent 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 pseudorandom 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 highfrequency signal is modulated, by frequency displacement, by a series of pseudorandom... 

3903407 
Method for correlating frequencymodulated signals
Apparatus and method for correlating frequencymodulated 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 crosscorrelation. The... 

3622967 
OPTIMUM STACK
Seismic traces are weighted and stacked to produce an estimated output trace having improved signaltonoise ratio. Those traces having the highest signaltonoise 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 continuouswave 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
