Method for qualitative evaluation of a digital audio signal

G - Physics – 10 – L

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G10L 19/00 (2006.01)

Patent

CA 2474067

The invention relates to a method for qualitative evaluation of a digital audio signal, characterized in that a quality indicator consisting of a vector associated with each time window is calculated in real and continuous time in successive time windows. The generation of said quality indicator vector involves, for example, the following stages for a reference audio signal and an audio signal to be evaluated: calculation of the spectral density of the power of the audio signal or calculation of the coefficients of a prediction filter by means of an autoregressive method, or calculation of the time activity of the signal or calculation of the minimum spectrum in successive blocks of the signal. The method can involve calculation of a distance between the vectors of the reference audio signal and the audio signal to be evaluated which are associated with each time window in order to evaluate the degradation of the audio signal.

L'invention concerne un procédé d'évaluation qualitative d'un signal audio numérique. Il est caractérisé en ce qu'il met en uvre en temps réel et en temps continu dans des fenêtres temporelles successives, le calcul d'un indicateur de qualité constitué par un vecteur associé à chaque fenêtre temporelle.Notamment, la génération d'un dit vecteur indicateur de qualité met par exemple enuvre pour un signal audio de référence et pour un signal audio à évaluer le calcul de la densité spectrale de puissance du signal audio ou bien le calcul des coefficients d'un filtre de prédiction par une méthode autorégressive, ou bien encore le calcul d'une activité temporelle du signal ou bien encore du minimum du spectre dans des blocs successifs du signal.Le procédé peut mettre enuvre le calcul d'une distance entre les vecteurs du signal audio de référence et du signal audio à évaluer associés à chaque fenêtre temporelle pour réaliser une évaluation de la dégradation du signal audio.

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