Patent ID: 7991621

Claim:
In an audio signal processing apparatus including an audio decoder, a method of processing an audio signal, comprising the steps of: identifying whether a coding type of the audio signal is a music signal coding type using first type information; if the coding type of the audio signal is not the music signal coding type, identifying whether the coding type of the audio signal is a speech signal coding type or a mixed signal coding type using second type information; if the coding type of the audio signal is the mixed signal coding type, extracting spectral data and a linear predictive coefficient from the audio signal; generating a residual signal for linear prediction by performing inverse frequency conversion on the spectral data; and reconstructing the audio signal by performing linear prediction coding on the linear predictive coefficient and the residual signal, wherein if the coding type of the audio signal is the music signal coding type, the first type information is used only and wherein if the coding type of the audio signal is the speech signal coding type or the mixed signal coding type, both of the first type information and the second type information are used.