Method and device for determining the quality of a signal

H - Electricity – 04 – R

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H04R 29/00 (2006.01) G10L 15/26 (2006.01) G10L 19/00 (2006.01) H04M 3/22 (2006.01)

Patent

CA 2396455

According to an objective measurement technique for determining the quality of an output signal (X(t)) of an audio or voice signals-processing and/or -transporting system, the output signal and a reference signal (Y(t)) are mapped on representation signals (R(X), R(Y)) of a suitably chosen perception model. A differential signal (D(t)) of the representation signals is averaged, in a time-averaging device (17), in two steps by two averaging members (31, 32) connected in series, over time, whereby a quality signal Q is generated. The time averaging is carried out by the first and second averaging members at the local and the global levels, respectively, using various averaging functions, e.g., preferably Lebesgue p- averaging functions having various p-values p1 > p2. Advantage: a high correlation between a generated quality signal Q and the human quality perception, even in the event of brief disturbances.

Selon une technique de mesure objective destinée à déterminer la qualité d'un signal de sortie (X(t)) dans le cas d'un système de traitement et/ou d'acheminement de signaux audio ou vocaux, on reporte ledit signal de sortie et un signal de référence (Y(t)) sur des signaux de représentation (R(X), R(Y)) d'un modèle de perception correctement choisi. On calcule la valeur moyenne d'un signal différentiel (D(t)) des signaux de représentation dans un dispositif de moyenne de temps (17),ceci en deux étapes au moyen de deux éléments d'établissement de moyenne (31, 32) connectés en série, temporairement, avec production d'un signal de qualité Q. La moyenne de temps est effectuée par les premier et second éléments d'établissement de moyenne aux niveau local et global, respectivement, à l'aide de diverses fonctions de moyenne, de préférence des fonctions de moyenne p de Lebesgue assorties de diverses valeurs p1 > p2. Avantage : corrélation élevée entre un signal de qualité Q produit et la perception humaine de qualité, même en cas de brèves perturbations.

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