Method for apparatus for audio matrix decoding

H - Electricity – 04 – S

Patent

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H04S 3/02 (2006.01)

Patent

CA 2420671

A method derives at least three audio signals, each associated with a direction, from two input audio signals. In response to the two input signals, a passive matrix generates a plurality of passive matrix audio signals, including two pairs of passive matrix audio signals, a first pair of passive amtrix audio signals represent directions lying on a first axis and a second pair of passive matrix audio signals represent directions lying on a second axis, the first and second axes being substantially at ninety degrees to ach other. The pairs of passive matrix audio signals are processed to derive a plurality of matrix coefficients therefrom. Th e processing includes deriving a pair of intermediate signals and urging each pair of intermediate signals toward equality in response to a respective error signal. At least three ouput signals are produced by matrix multiplying the two input signals by the matrix coefficients.

L'invention concerne un procédé dérivant au moins trois signaux audio, chacun associé à une direction, à partir de deux signaux d'entrée audio. En réponse aux deux signaux d'entrée, une matrice passive génère plusieurs signaux audiomatriciels passifs, comprenant deux paires de signaux audiomatriciels passifs, une première paire de signaux audiomatriciels passifs représente des directions s'étendant le long d'un premier axe et une seconde paire de signaux audiomatriciels passifs représente des directions s'étendant le long d'un second axe, les premier et second axes étant sensiblement perpendiculaires l'un à l'autre. Les paires de signaux audiomatriciels passifs sont traitées afin d'en dériver plusieurs coefficients matriciels. Le traitement consiste à dériver une paire de signaux intermédiaires et à forcer chaque paire de signaux intermédiaires à l'égalité en réponse à un signal d'erreur respectif. Au moins trois signaux de sortie sont produits par multiplication matricielle des deux signaux d'entrée avec les coefficients de la matrice.

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