FIELD: physics.
SUBSTANCE: coder for coding the audio signal comprises: an analyzer configured to extract the prediction coefficients and the residual signal from the unvoiced audio frame; a growth rate calculating unit configured to calculate the first growth rate information (gc) for setting the first excitation signal (c(n)) associated with the deterministic coding table and calculating the second growth rate information (gn) for setting the second excitation signal (n(n)) associated with the noise-like signal for the unvoiced frame; and a bit stream generation unit (690) configured to generate an output signal based on information associated with the voiced signal frame, information of the first growth rate (gc) and information of the second growth rate (gn).
EFFECT: improving the quality of the coded audio at low bit rates.
20 cl, 17 dwg
