FIELD: physics.
SUBSTANCE: invention relates to means of quantising a gain of a fixed contribution of an excitation in a frame, including sub-frames, of a coded sound signal. Gain of fixed excitation contribution is estimated in a sub-frame using a parameter representative of a classification of frame. Gain of fixed excitation contribution is then quantised in sub-frame using estimated gain. Device and method are used in jointly quantising gains of adaptive and fixed contributions of an excitation in a frame of a coded sound signal. For retrieving a quantised gain of a fixed contribution of an excitation in a sub-frame of a frame, gain of fixed excitation contribution is estimated using a parameter representative of a classification of frame, a gain codebook supplies a correction factor in response to a received, gain codebook index, and a multiplier multiplies estimated gain by correction factor to provide a quantised gain of fixed excitation contribution.
EFFECT: improved reliability of encoding by reducing probability of packet loss during transmission of coding parameters from coder to decoder.
50 cl, 6 dwg
