Method and apparatus for processing an audio signal

G - Physics – 10 – L

Patent

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Details

G10L 19/00 (2006.01) G11B 20/10 (2006.01) H03M 7/30 (2006.01) H04N 7/24 (2006.01)

Patent

CA 2717584

An apparatus for processing an encoded signal and method thereof are disclosed, by which an audio signal can be compressed and reconstructed in higher efficiency. An audio signal processing method includes 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, reconstructing the audio signal by performing linear prediction coding on the linear predictive coefficient and the residual signal, and reconstructing a high frequency region signal using an extension base signal corresponding to a partial region of the reconstructed audio signal and band extension information. Accordingly, various kinds of audio signals can be encoded/decoded in higher efficiency.

La présente invention concerne un procédé et un appareil de traitement d'un signal de codage pouvant comprimer ou décomprimer avec grande efficacité un signal sonore. Selon un mode de réalisation, un procédé de traitement d'un signal sonore consiste à: déterminer si le type de codage d'un signal sonore est un type de codage de signal musical ou non en utilisant des informations de premier type; déterminer si le type de codage du signal sonore est un type de codage de signal de parole ou un type de codage de signal mixte en utilisant des informations de second type; si le type de codage du signal sonore n'est pas un type de codage de signal musical, extraire des données spectrales et des coefficients de prédiction linéaire du signal sonore; si le type de codage du signal sonore est un type de codage de signal mixte, générer un signal résiduel de prédiction linéaire en appliquant une transformée de Fourier inverse aux données spectrales, décomprimer le signal sonore en codant par prédiction linéaire les coefficients de prédiction linéaire et le signal résiduel, et décomprimer un signal de zone à haute fréquence en utilisant un signal de base étendu en tant que zone partielle du signal sonore décomprimé et des informations d'extension de la bande passante. Le procédé de l'invention permet de coder ou de décoder avec grande efficacité une gamme étendue de types de signal sonore.

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