Method, apparatus and computer program for calculating and...

Details Method, apparatus and computer program for calculating and... Method, apparatus and computer program for calculating and...

G - Physics

10

L

G10L 11/00 (2006.01) H03G 3/32 (2006.01)

Patent

CA 2525942

One or a combination of two or more specific loudness model functions selected from a group of two or more of such functions are employed in calculating the perceptual loudness of an audio signal. The function or functions may be selected, for example, by a measure of the degree to which the audio signal is narrowband or wideband. Alternatively or with such a selection from a group of functions, a gain value G[t] is calculated, which gain, when applied to the audio signal, results in a perceived loudness substantially the same as a reference loudness. The gain calculating employs an iterative processing loop that includes the perceptual loudness calculation.

Un(e) ou plusieurs fonctions ou modèles de force sonore spécifiques combiné(e)s choisi(e)s dans un groupe d'au moins deux fonctions de ce type est utilisée dans le calcul de la force sonore perceptive d'un signal sonore. La ou les fonctions peuvent être sélectionnées, par exemple, par la mesure de la largeur de bande du signal pour déterminer s'il est à bande étroite ou à bande large. Autrement, ou avec ladite sélection dans un groupe de fonctions, une valeur de gain <I>G</I>[t] est calculée, lequel gain, lorsqu'il est appliqué sur le signal sonore, induit une force sonore perçue sensiblement identique à la force sonore de référence. Pour le calcul de gain, une boucle de traitement itérative comprenant le calcul de la force sonore perceptive est utilisée.

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