Method and apparatus for deriving at least one audio signal...

H - Electricity – 04 – S

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H04S 3/02 (2006.01)

Patent

CA 2392602

A multidirectional audio decoder using an "adaptive" audio matrix derives at least one of a plurality of output audio signals from two or more directionally-encoded audio input signal streams (S1(.alpha.), S2(.alpha.), ...SN(.alpha.), wherein .alpha. is the encoded angle of a source audio signal. Each output signal is associated with a principal direction .beta.. In order to generate each output signal, a pair of intermediate signals ("antidominant" signals) are generated, constituting the antidominant signal for each of the two adjacent principal output directions of the decoder. The antidominant signal for any arbitrary principal (or "dominant") direction is the combination of input signals having coefficients such that the combination goes to zero for that dominant direction. Amplitude control is applied to the two antidominant signals to deliver a pair of signals having substantially equal magnitudes that are additively or subtractively combined to provide the output audio signal associated with a principal direction.

Le décodeur audio multidirectionnel utilisant une matrice audio "adaptative" dérive au moins un des nombreux signaux audio de sortie à partir d'au moins deux flux de signaux audio d'entrée codés par la direction S1(.alpha.), S2(.alpha.), ...SN(.alpha.), .alpha. étant l'angle codé d'un signal audio de source. Chaque signal de sortie est lié à une direction principale .beta.. En vue de générer chaque signal de sortie, une paire de signaux intermédiaires (signaux "antidominants") sont générés, ce qui permet de constituer le signal antidominant pour chacune des deux directions de sortie principales adjacentes du décodeur. Le signal antidominant pour toute direction principale (ou "dominante") arbitraire constitue la combinaison de signaux d'entrée dotés de coefficients, de telle manière que la combinaison va vers zéro pour cette direction dominante. Une commande d'amplitudes est appliquée aux deux signaux antidominants pour produire une paire de signaux dotés de magnitudes quasi égales qui sont combinés par addition ou par soustraction pour générer le signal audio de sortie lié à une direction principale.

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