Class 367/60 - Special digital system

Subclass of Class 367 - Communications, electrical: acoustic wave systems and devices
Definition: Subject matter wherein signals are in digital form and are
No. of patents: 37
Last issue date: 09/11/2007

Number	Title	Issue Date
7269095	Synchronization of seismic data acquisition systems A network distributed seismic data acquisition system comprises seismic receivers connected to remote acquisition modules, receiver lines, line tap units, base lines, a central recording system and a seismic source event generation unit synchronized to a master cloc...	09/11/2007
7218612	Network synchronization A network arrangement uses a poll select control protocol and a loop back arrangement at each node for equalizing transmission delay from each node to a central station. Delays at each node can be adjusted to start timing in response to a broadcast signal indicating...	05/15/2007
7203600	Geophysical data processing A mehtod of determinig an integral of a function over an n-dimensional intergratio domain from the values of the function at a plurality of discrete data points within the integration domain, comprises partitioning the integration domain into a plurality of k-dimens...	04/10/2007
6992951	Permanent seafloor seismic recording system utilizing micro electro-mechanical systems seismic sensors and method of deploying same Provided is a permanent seafloor seismic recording system utilizing Micro Electro-Mechanical Systems seismic sensors. The system includes and expandable backbone, multiple hubs and sensor lines. The sensor lines include multiple sensor modules that include 3-C accel...	01/31/2006
6308135	Soil liquefaction prevention by electro-osmosis during an earthquake event A method and system of preventing soil liquefaction beneath a structure during an earthquake event, by monitoring local seismic precursor events, such as early arrival ground motion using an accelerometer, predicting the onset of a major earthquake tremor...	10/23/2001
6021198	Apparatus, system and method for secure, recoverable, adaptably compressed file transfer The present invention provides a system for handling and transmitting a file over a communication channel wherein the file may be adaptably compressed to improve throughput. The invention also provides for a method of recovery in the event of a communicat...	02/01/2000
5450369	Telemetry transmission protocol for towed hydrophone streamer Disclosed is a protocol for transmitting data in a towed hydrophone streamer, including a transmission method and a data frame. The method comprises the steps of (1) receiving a portion of the data frame into a data transmission circuit within a particula...	09/12/1995
5137830	Post-compression method of measuring soil gas concentration and emission Measuring of soil gas flux. Particularly a method of measuring soil gas concentration and emission flux during a period of post-compression of the earth's crust. The method includes observing gravitational acceleration on the surface of the earth, as defi...	08/11/1992
4901289	System for acquiring and recording signals delivered by a set of sensors disposed in well probes A system is provided for acquiring and recording signals delivered by a set of sensors disposed in one or more probes lowered into a well at the end of a multi-function cable. The different signals to be transmitted are multiplexed before being applied to...	02/13/1990
4819214	Sonic logging system A sonic well logging system and apparatus for determination of seismic wave velocities from a seismic wave propagating in a subterranean formation about a wellbore. The system includes the process of imparting a seismic wave into the subterranean formatio...	04/04/1989
4744064	Method and apparatus for seismic exploration Method and apparatus for digitally deriving arrays from seismic data. Indentical parallel processing elements connected between common input/output buses are each preselected to derive different pluralities of arrays. Array specifications defining the arr...	05/10/1988
4682296	Ultrasonic imaging Ultrasonic imaging equipment comprising ultrasonic transducers (A, B, etc.) which are sequentially and repetitively triggerable by equally spaced triggers (Z) to give echoes which can be read, stored and processed in a computer-based recording device is c...	07/21/1987
4661932	Dynamic downhole recorder A method and apparatus allows dynamic data to be recorded in a drill string for later playback at the surface. The system includes a transducer located in a sub in the drill string which provides electrical responses to a analog to digital converter. A ti...	04/28/1987
4661934	Ground position controller and method for automatically indicating parameters that spatially cross-reference the locations of seismic spread and source arrays during exploration for hydrocarbons and the like The present invention relates to a ground position controller utilizing a microcomputer system interconnected to a digital field system (DFS) via a system bus, for generating, formatting and displaying information (for insuring integrity of field operatio...	04/28/1987
4648063	Programming a peripheral computer In a system wherein a peripheral computer is utilized to lighten the load on a central computer or to perform a special function which cannot be performed by the central computer, method and apparatus is provided whereby the central computer can be utiliz...	03/03/1987
4616349	Analog-to-digital converter for seismic exploration using delta modulation An analog-to-digital converter for use in seismic data processing applications is disclosed which features variants on delta modulation and delta-sigma modulation methods. A series of single bits is output by an analog-to-digital converter based on compar...	10/07/1986
4587642	Seismic data enhancement method and apparatus A method of enhancing the signal to noise ratio of seismic data includes the steps of repeatedly obtaining, from at least one array of seismic detectors, analog signals representative of sensed vibrations or pressure waves. Each analog signal is converted...	05/06/1986
4549285	Apparatus for real time correlation in seismic prospection The invention provides an apparatus for seismic prospecting which is to effect a correlation in real time between a pilot signal and a picked-up seismic signal. With N being the number of samples corresponding to the desired thoroughness of investigation,...	10/22/1985
4373198	Updating and alerting method and apparatus associated with a microcomputer system for automatically indicating and recording parameters that spatially define locations of seismic exploration spread and source arrays The present invention relates to a method and apparatus for selectively providing an alarm-generating digital code so as to alert an operator that the next-in-time positions of a source-detector array are the last approved locations before the recording t...	02/08/1983
4369505	Method and apparatus associated with a microcomputer system for automatically testing a next-in-time positional parameter of an exploration system that includes two recording trucks The present invention relates to testing--at a second recording truck--a positional reference code (generated by a first recording truck); the reference code (associated with next-in-time positions of a source-detector array operatively connected to the s...	01/18/1983
4330873	Aplanatic geophysical exploration system This invention utilizes data collected in the course of reflection seismic prospecting methods to produce a map, such as a vertical profile or a three-dimensional picture, of subterranean earth formations. This is accomplished by aplanatic mapping of rece...	05/18/1982
4323990	Seismic exploration system A seismic data generation and collection system is described for use in a exploration vessel for determining the subsea structure of the earth. A plurality of acoustic energy sources are towed behind the boat and acoustic waves are emitted therefrom by co...	04/06/1982
4319347	Seismic method and system of improved resolution and discrimination A seismic cable assembly has approximately 500 equally spaced elemental sensor units to receive seismic signals generated in the earth by a seismic impulse generator or "shot". The sensor units each include 3 hydrophones or geophones spaced about 6 feet a...	03/09/1982
4312051	Data display Sample and hold circuits are utilized to divide data stored in memory into a plurality of channels for display. First-in-first-out buffers are utilized to compensate for the difference between the time required to read data from a memory and the time requ...	01/19/1982
4285052	Roll-along switch The electronic roll-along switch consists of several input multiplexers, each having a number of inputs that are connected to seismic detectors, and an output line. A plurality of multiple-input sample-and-hold modules are provided. Corresponding inputs o...	08/18/1981
4276620	Method and apparatus for obtaining a composite field response _to a variable source array using weighting coefficients A multi-channeled digital seismic field stacking system is disclosed for obtaining the composite response to a variable source array. A variable source array is synthesized by applying preselected weighting coefficients to the seismic signals produced in ...	06/30/1981
4224474	Method and apparatus for demultiplexing multiplexed seismic data A seismic data acquisition system provides seismic signal data samples in multiplexed channel sequential order during a recording cycle. The multiplexed data samples from a recording cycle are demultiplexed by storing the data samples in consecutive order...	09/23/1980
4214128	Method and apparatus for demultiplexing multiplexed seismic data In a multichannel seismic system, channel-sequential seismic data samples gathered during a first recording cycle are demultiplexed to sample-sequential format in a core memory. The core memory is divided into pages each of which is addressable in two dim...	07/22/1980
4201972	Seismic prospecting system This invention relates to an improved system for employing seismic techniques for surveying the subsurface structures of the earth. The invention relates particularly to an improved system for generating, collecting and processing the data during the cour...	05/06/1980
4202048	Seismic prospecting system This invention relates to an improved system for employing seismic techniques for surveying the subsurface structures of the earth. The invention relates particularly to an improved system for generating, collecting and processing the data during the cour...	05/06/1980
4189704	Method and apparatus for determination of optimum velocity in 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 enough apart so that their seismic waves originate at different ...	02/19/1980
4188611	Seismic prospecting system This invention relates to an improved system for employing seismic techniques for surveying the subsurface structures of the earth. The invention relates particularly to an improved system for generating, collecting and processing the data during the cour...	02/12/1980
4144949	Bit positioning while drilling system A method and apparatus for determining the precise position of the drill bit on the bottom of a long drill string in a deep borehole in the earth during a drilling operation, comprising placing a plurality of geophones in an array near the surface of the ...	03/20/1979
4084151	System for recording and processing seismic reflection signals A seismic recording system employs amplifiers, a multiplexer, and an analog-to-digital converter for converting analog seismic reflection signals obtained during seismic exploration operations to a serial output of multiplexed digital samples. An input co...	04/11/1978
4021649	Data compositing and array control system This abstract describes a system for acquisition of analog signals at a plurality of sensors, carrying these signals in groups of M channels to each of N spaced-apart array terminals, processing each signal in the array terminals by separately amplifying,...	05/03/1977
4004267	Discrete frequency seismic exploration using non uniform frequency spectra A seismic exploration method is described in which a vibratory source transmits into the earth a series of discrete wave packets of different center frequencies, at least some of which are not uniformly spaced in frequency. Some of the center frequencies ...	01/18/1977
3986008	Data compositing and array control system This abstract describes a system for acquisition of analog signals at one or more sensors, carrying these signals in groups of M channels to each of N spaced-apart array terminals, processing each signal in the array terminals by separately amplifying, ad...	10/12/1976

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Class 367/60 - Special digital system