AUDIO SIGNAL PROCESSING METHOD AND DEVICE Russian patent published in 2012 - IPC G10L19/00 H03M7/30 

FIELD: information technology.

SUBSTANCE: method of processing an audio signal comprises steps for determining whether the audio signal encoding type is musical signal encoding type using first type information. If the audio signal encoding type is not a musical signal encoding type, it determined whether the audio signal encoding type is a speech signal encoding type or a mixed signal encoding type using second type information. If the audio signal encoding type is a mixed signal encoding type, spectral data and a linear prediction coefficient is extracted from the audio signal; a difference signal for linear prediction by performing inverse frequency transformation over spectral data is generated; the audio signal is reconstructed by performing linear predictive coding over the linear prediction coefficient and the difference signal and the high-frequency domain signal is reconstructed using a base extension signal corresponding to the frequency domain of the reconstructed audio signal and range extension information.

EFFECT: higher efficiency of coding/decoding a audio signals.

15 cl, 14 dwg