Method of decoding two-channel matrix encoded audio to...

H - Electricity – 04 – R

Patent

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Details

H04R 3/02 (2006.01) H04R 5/04 (2006.01) H04S 1/00 (2006.01) H04S 3/02 (2006.01)

Patent

CA 2423893

The present invention provides a method of decoding two-channel matrix encoded audio (32) to reconstruct multichannel audio (34) that more closely approximates a discrete surround-sound presentation. This is accomplished by subband filtering (54) the two-channel matrix encoded audio, mapping (70) each of the subband signals into an expanded sound field (68) to produce multichannel subband signals, and synthesizing (78) those subband signals to reconstruct multichannel audio. By steering the subbands separately about an expanded sound field, various sounds can be simultaneously positioned about the sound field at different points allowing for more accurate placement and more distinct definition of each sound element.

La présente invention concerne un procédé de décodage d'audiofréquence (32) codée par matrice bicanal destiné à reconstruire une audiofréquence (34) multicanal, qui se rapproche davantage d'une présentation de son d'ambiance <=surround>= distincte. On obtient ce résultat par un filtrage (54) sous bande des audiofréquences codées par matrice bicanal, par une mise en correspondance (70) de chacun des signaux sous bande dans un champ (68) sonore étendu de façon à produire des signaux sous bande multicanaux, et par une synthèse (78) de ces signaux sous bande de façon à reconstruire une audiofréquence multicanal. En dirigeant séparément les sous bandes autour d'un champ sonore étendu, on peut positionner simultanément divers sons autour de ce champs sonore à différents points, ce qui permet d'obtenir un positionnement plus précis et une définition plus distincte de chaque élément sonore.

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