Thomson-Csf

Denis Rochette

Pierre A Laurent

The method disclosed consists in analyzing the vocal signals in consecutive windows, in quantifying, on a determined number m of levels, the vocal signal in each of the windows and in measuring, in each of the windows, the vocal signal in each of the windows and in measuring, in each of the windows, the r-m-s value of the samples of the vocal signal. It consists constructing, in a vector space with n dimensions having, as its first base, the unit vectors (E.sub.0 to E.sub.n-1) of the energies measured on n consecutive windows, a resultant energy vector E corresponding to the sum of n energy vectors measured respectively in n windows of analysis of the vocal signal, then in achieving, in this space, a change of base having, as its first main axis, an oriented axis of unit vector having, as its components, the unit vectors of the first base, to project, in the new base obtained, the resultant energy vector. Codings on q bits such that 2.sup.q =m of the component of the resultant vector projected on the main axis of the new base and on a reduced number of bits smaller than q, of the components of the energy vector projected on the n-1 other main axes of the vector space defined in the new base, are then made. An embodiment of a device corresponding to n=3 is described.

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Paris, France

Denis Rochette