Patent ID: 6253156
Filing Date: 2001-06-26
Classification: G01V

Abstract:
A method intended for synchronized acquisition of seismic signals by at least one acquisition unit comprising an analog-to-digital converter, allowing to obtain a series y[n] of samples of each signal readjusted from at least one reference time (t.sub.R) on, from a first series x[n] of digitized samples of this seismic signal, produced from any initial time (t.sub.0) prior to the reference time by said converter with a definite sampling interval (.DELTA.t), characterized in that it comprises:detecting a synchronization signal indicative of this reference time (t.sub.R),measuring the effective time difference (D) between reference time (t.sub.R) and initial time (t.sub.0),calculating coefficients of a fractional digital filter (F) suited to compensate for the measured effective time difference, the coefficients being sufficient in number to obtain a fixed time compensation precision, andapplying the fractional digital compensation filter to the first series of samples, which allows to obtain a series of digitized samples readjusted from reference time (t.sub.R).