Patent ID: 7292171
Filing Date: 2007-11-06
Classification: G10L,G11B

Abstract:
1. Method for the conversion of signals called input digital signals, comprising a phase for the modulation of said input signals; characterized in the said modulation is performed by the implementation of a vector lattice encoder and in that said method comprises the following encoding steps: a preliminary step consisting of the choice of three parameters respectively representing a determined number N of distinct variables associated with said input signals, called output candidates, a determined number K of possible temporal developments of said candidates, and a temporal variable T, called historical decision depth, determining a maximum number of iterations before the generation of a result; a first step for the filtering (Hx) of said input signals (x(n)) so as to generate first filtered signals; a second step for the filtering (Hq) of signals representing candidates, so as to generate second filtered signals representing filtered candidates; a third step in which the difference is taken between the said first and second filtered signals; a fourth step consisting of the pre-selection, by means of a pre-selection element, for each of said N candidates, of the first to the Kth modified candidates representing said K possible developments and each meeting a first predetermined criterion, said first candidate (a) being the one that minimizes said difference; a fifth step consisting of the weighting of said difference by means of function called a cost function classifying said K developments so as to mark the candidates designed to be eliminated or kept for a subsequent iteration of the steps of said method, and of the transmitting of said modified candidates to a selection element; a sixth step consisting of the selection of the best candidate by said selection element by comparison with a second predetermined criterion minimizing said cost function (W); a seventh step consisting of iterations from the first to sixth steps until said historical decision depth T is attained; and an eighth step consisting of choosing the best candidate at the end of said seventh step.