Sercel Inc.

Emmanuel Senechal

Michel Terre

Jean-Eric Negre

Luc Fety

Fatima Ghanem Elkorso

A method is provided for transmitting signals on a multi-conductor cable () formed from a plurality of conductors (-) surrounded by an armor (), the plurality of conductors having a central conductor () surrounded by a first peripheral layer of conductors (-) with an even number of conductors symmetrically arranged around the central conductor. The two following transmission modes are carried out simultaneously: a common mode (TX) that uses the central conductor () with a return on the armor (), for transmitting a first signal (s); and a differential mode (TX) between a first path comprising all odd rank conductors () of the peripheral layer and a second path comprising all even rank conductors () of the peripheral layer, for transmitting a second signal (s).

Method and system for transmitting signals on a multi-conductor cable

A system and method for adjusting a clock signal of a seismic data acquisition system. The system includes a data acquisition device having an oscillator that generates a clock signal; a clock adjustment module that receives a time reference signal and the clock signal and outputs an adjusted clock signal; and an analog-to-digital convertor configured to transform analog data into digital data having a sampling rate (F). A sampling frequency (f) of the analog-to-digital convertor is selected to be at least twice the sampling rate (F).

Average clock adjustment for data acquisition system and method

The invention proposes a data transmission process, from a first unit () situated at a predetermined depth of an oil well to a second unit () situated at the surface of this well, the process comprising a digital-analog conversion stage () of the data to obtain an analog signal forming support of the data, and an amplification stage () of this signal prior to its emission in a cable () connecting the two units,

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Carquefou, France

Emmanuel Senechal