FIELD: physics.
SUBSTANCE: invention relates to means of quantising, in a super-frame including a sequence of frames, LPC filters calculated during the frames of the sequence. The LPC filter quantising device comprises: an absolute quantiser for first quantising one of the LPC filters using absolute quantisation; and at least one quantiser of the other LPC filters using a quantisation mode selected from a group consisting of absolute quantisation and differential quantisation relative to at least one previously quantised filter among the LPC filters. For inverse quantising, at least the first quantised LPC filter is received and an inverse quantiser inverse quantises the first quantised LPC filter using absolute inverse quantisation. If any quantised LPC filter other than the first quantised LPC filter is received, an inverse quantiser inverse quantises this quantised LPC filter using one of the following inverse quantisation modes: absolute inverse quantisation and differential inverse quantisation relative to at least one previously received quantised LPC filter.
EFFECT: fewer bits involved in LPC filter quantisation.
32 cl, 10 dwg, 4 tbl
