FIELD: physics, computer engineering.
SUBSTANCE: invention relates to computer engineering. The vector quantiser comprises a first selecting section that selects a classification code vector indicating a type of a feature correlated with a quantisation target vector, from a plurality of classification code vectors; a second selecting section that selects a first codebook corresponding to the selected classification code vector from a plurality of first codebooks; a first quantisation section that quantises the quantisation target vector using a plurality of first code vectors forming the selected first codebook, to produce a first code; a third selecting section that selects a first matrix corresponding to the selected classification code vector from a plurality of matrices; and a second quantisation section that quantises a first residual vector which is the difference between the first code vector, said first code and the quantisation target vector, using a plurality of second code vectors and the selected first matrix, to produce a second code.
EFFECT: high accuracy of quantisation in vector quantisation.
9 cl, 6 dwg
