Audio channel spatial translation

H - Electricity – 04 – S

Patent

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H04S 3/00 (2006.01) H04S 5/02 (2006.01)

Patent

CA 2494454

Using an M:N variable matrix, M audio input signals, each associated with a direction, are translated to N audio output signals, each associated with a direction, wherein N is larger than M, M is two or more and N is a positive integer equal to three or more. The variable matrix is controlled in response to measures of: (1) the relative levels of the input signals, and (2) the cross-correlation of the input signals so that a soundfield generated by the output signals has a compact sound image in the nominal ongoing primary direction of the input signals when the input signals are highly correlated, the image spreading from compact to broad as the correlation decreases and progressively splitting into multiple compact sound images, each in a direction associated with an input signal, as the correlation continues to decrease to highly uncorrelated.

Une matrice variable M:N permet de moduler des signaux d'entrée audio M, chaque signal étant associé à une direction, pour les convertir en signaux de sortie audio N, chaque signal étant associé à une direction, N étant supérieur à M, M étant supérieur ou égal à 2, et N étant un nombre entier positif supérieur ou égal à 3. La matrice variable est commandée en réaction à des mesures : (1) des niveaux relatifs des signaux d'entrée, et (2) de la corrélation croisée des signaux d'entrée, de sorte qu'un champ acoustique généré par les signaux de sortie présente une image sonore compacte dans la direction primaire continue nominale des signaux d'entrée, lorsque les signaux d'entrée sont hautement corrélés, l'image s'étale du compact au large, lorsque la corrélation diminue et se divise progressivement en plusieurs images sonores compactes, chacune dans une direction associée à un signal d'entrée, lorsque la corrélation continue à diminuer pour devenir hautement non corrélée.

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