Patent ID: 6826227
Filing Date: 2004-11-30
Classification: G01V,H03M

Abstract:
A method of loss-free transmission of seismic signals having a dynamic range comprising:sampling the seismic signals and providing digitized samples of the seismic signals; compressing the digitized samples using a predictive coding technique to provide prediction coefficients and prediction residues, the prediction residues comprising binary words; determining an estimation factor corresponding to a mean value &Scirc; obtained from the position of respective most significant bits of the binary words coding the prediction residues, by a statistical evaluation of bits of the binary words of the prediction residues, and deducing at least one optimum threshold value which defines an amplitude range containing a determined amount of the prediction residues; coding the prediction residues in the amplitude range by binary words of a number of bits dependent on the mean value &Scirc;; coding the prediction residues, which have an amplitude outside the amplitude range, with a determined number of bits greater than the number of bits used to code the prediction residues having amplitude within the amplitude range; and transmitting only the prediction residues.