Geometric transcoding of a digital signal

摘要

A method for the geometric transcoding of a compressed data file (F) containing a digital signal of dimension N coded by means of a coding method including at least one step of spectral breakdown into frequency sub-bands of the digital signal (S) includes the following steps: extracting (E9) symbols associated with the coefficients of the frequency sub-bands of the digital signal; applying (E10) a geometric transformation to said symbols; updating (E12, E13) N indicator or indicators representing a normal or reversed order of the symbols respectively in N direction or directions of the digital signal and reconstituting (E18) the digital signal coded by reversal of the extraction step (E9). <IMAGE>