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| Number | Title | Issue Date |
| 7358881 | Quantizer overload prevention for feed-back type delta-sigma modulators A digital signal processing system includes a delta sigma modulator that maintains a low pass output during quantizer overload prevention conditions. In at least one embodiment, the delta sigma modulator includes a quantizer overload protected delta sigma modulator ... | 04/15/2008 |
| 7124028 | Method and system for transmission of seismic data The transmission method utilizes multiple seismic acquisition units within an array as intermediate short range radio receivers/transmitters to pass collected seismic data in relay fashion back to a control station. Any one seismic unit in the array is capable of tr... | 10/17/2006 |
| 7117094 | Seismic measuring system including GPS receivers A system for analyzing three-dimensional seismic data includes a plurality of digitizer units, each with a configuration of geophones, a data recording and control center, a base GPS receiver with an associated antenna with a substantially unrestricted view of the s... | 10/03/2006 |
| 7058823 | Integrated circuit having programmable voltage level line drivers and method of operation There is disclosed, for use in an integrated circuit, an apparatus for driving a signal line in the integrated circuit. The apparatus comprises: 1) a line driver for receiving an incoming data signal and transmitting an outgoing data signal on the signal line; 2) a ... | 06/06/2006 |
| 6075752 | Method for exploring an environment with a complex tectonics The method consists in building a common midpoint gather of seismic traces of which the CMP point is said given point, subjecting the traces of this gather to dynamic and/or static corrections, and characterized in that the gather associated with the give... | 06/13/2000 |
| 5051962 | Computerized truck instrumentation system In a representative embodiment of the invention described herein, a well logging system for investigating subsurface formations is controlled by a general purpose computer programmed for real-time operation. The system is cooperatively arranged to provide... | 09/24/1991 |
| 4843395 | Large dynamic range analog to digital converter An analog-to-digital converter system for converting an input analog signal having a wide dynamic range to a digital output has a non-linear function generator for compressing the wide dynamic range input signal to a reduced dynamic range signal, an analo... | 06/27/1989 |
| 4727521 | Seismic amplifier means and method The seismic amplifier includes an amplifying circuit which amplifies an analog signal to provide an amplified analog signal. The amplified analog signal is converted to digital signals. A controlled network connected to the amplifier circuit controls the ... | 02/23/1988 |
| 4725950 | Marine seismic signal processor with D.C. offset compensation method A processor responsive to multiple AC analog signals has individual sampling circuits to sample and hold each AC analog signal in DC form. After the DC signals are multiplexed, a single error correction circuit calculates correction voltages individualize... | 02/16/1988 |
| 4706226 | Seismic line amplifier A geophone amplifier including a low cut filter which provides non-linear amplification of the signal to produce a substantially flat frequency response so as to enhance high frequency signals containing high resolution information. Discrete plug-in modul... | 11/10/1987 |
| 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 |
| 4610006 | Automatic control system for acoustic logging A circuit is disclosed for use in an acoustic logging tool incorporating a transmitter sending an acoustic pulse which is received by acoustic receivers. In the preferred and illustrated embodiment hereof, an automatic gain control (AGC) circuit controls ... | 09/02/1986 |
| 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 |
| 4581725 | Method and system for gain selection An amplifier system repeatedly samples the voltage level of an analog signal and selects the gain to be applied to successive samplings of such signal in response to the voltage level of the sampled signals to thereby raise the amplitude of each sampled s... | 04/08/1986 |
| 4527148 | Analog-digital converter An A/D converter used with an A/D conversion system in which each of input analog signals applied thereto is amplified at a gain selected depending or the level of said each signal and subjected to A/D conversion. The A/D converter is arranged to select a... | 07/02/1985 |
| 4412207 | Digital induction logging tool including a floating point A/D A floating point analog-to-digital converter for use in a digital induction logging tool is disclosed. Floating point samples of phase quadrature components of the receiver signal are obtained. Each sample contains a digital word representing the exponent... | 10/25/1983 |
| 4338589 | Autocalibration of compressed A/D converter An analog-to-digital converter system is disclosed in which the amplitude of the signal is compressed by means including a logging means prior to an analog-to-digital converter. Reference signals of known values are applied to the logging means and their ... | 07/06/1982 |
| 4297745 | Gain ranging amplifier A gain ranging amplifier system is provided for use in the acquisition of data. Voltage offset compensation is utilized to correct errors in the gain ranging amplifier system caused by thermal drift and temperature dependent voltage offsets, both of which... | 10/27/1981 |
| 4194163 | Floating point amplifier means and method A wide dynamic range automatic high speed gain ranging amplifier system includes a receiver circuit adapted to receive an analog input signal. A single stage amplifier is connected to the receiver circuit which amplifies a received analog signal to provid... | 03/18/1980 |
| 3988712 | Multiplex data communication system exploration surveys A cable for electrically connecting a plurality of seismic receivers to a central data collecting unit contains a single electrical channel. The output signal of each seismic receiver is used to modulate a carrier signal having its own distinct frequency.... | 10/26/1976 |
| 3972020 | Transformerless input for seismic data acquisition system In a long line data acquisition system, an input network is provided for coupling the lines to a data acquisition unit. The network includes the cascade combination of a first filter presenting a low pass frequency response to common mode voltage and a se... | 07/27/1976 |
