FIELD: information technology.
SUBSTANCE: device has a classification section which classifies feature type, a selection section which selects a first codebook associated with the feature type, a first quantisation section which obtains a first vector quantisation code, a codebook of scaling factors containing scaling factors associated with feature types, and a second quantisation section containing a second codebook, having second code vectors, and obtains a second code using the second code vectors and the scaling factor associated with the feature type.
EFFECT: high accuracy of quantisation at the second and next vector quantisation step.
9 cl, 5 dwg
