Patent ID: 8831958

Claim:
A method for processing an audio signal, the method comprising: receiving, by an audio processing apparatus, a spectral data of a lower band, coding scheme information, and type information, the coding scheme information indicating an audio coding scheme or a speech coding scheme, the type information indicating a first band extension scheme or a second band extension scheme for a current frame of the audio signal; decoding, by the audio processing apparatus, the spectral data of the lower band using one of the audio coding scheme and the speech coding scheme based on the coding scheme information; when the type information indicates the first band extension scheme for the current frame, generating, by the audio processing apparatus, a spectral data of a higher band in the current frame using the decoded spectral data of the lower band by performing the first band extension scheme; and when the type information indicates the second band extension scheme for the current frame, generating, by the audio processing apparatus, the spectral data of the higher band in the current frame using the decoded spectral data of the lower band by performing the second band extension scheme, wherein the first band extension scheme is based on a first data area of the spectral data of the lower band, and the first data area corresponds to a portion of the spectral data of the lower band, said portion being less than all of the spectral data of the lower band, and wherein the second band extension scheme is based on a second data area of the spectral data of the lower band, and the second data area corresponds to all of the spectral data of the lower band.