Method and apparatus for determining directions of uncorrelated sound sources in a higher order ambisonics representation of a sound field

Verfahren und vorrichtung zur bestimmung der richtungen unkorrelierter schallquellen bei einer higher-order-ambisonics-wiedergabe eines schallfeldes

Procédé et appareil pour déterminer des directions de sources sonores non corrélées dans une représentation ambiophonique d'ordre supérieur d'un champ sonore

Abstract

Higher Order Ambisonics (HOA) represents three-dimensional sound. HOA provides high spatial resolution and facilitates analysing of the sound field with respect to dominant sound sources. The invention aims to identify independent dominant sound sources constituting the sound field, and to track their temporal trajectories. Known applications are searching for all potential candidates for dominant sound source directions by looking at the directional power distribution of the original HOA representation, whereas in the invention all components which are correlated with the signals of previously found sound sources are removed. By such operation the problem of erroneously detecting many instead of only one correct sound source can be avoided in case its contributions to the sound field are highly directionally dispersed.
L'ambiophonie d'ordre supérieur (HOA) représente un son en trois dimensions. La HOA fournit une résolution spatiale élevée et permet d'analyser le champ sonore par rapport à des sources sonores dominantes. La présente invention a pour objectif d'identifier de façon indépendante des sources sonores dominantes qui constituent le champ sonore, et de suivre leurs trajectoires temporelles. Dans des applications de l'état de la technique, tous les candidats potentiels en rapport avec les directions de sources sonores dominantes sont recherchés en examinant la distribution de puissance directionnelle de la représentation original de l'HOA. Par contre, dans la présente invention, toutes les composantes qui sont corrélées aux signaux de sources sonores précédemment trouvées sont supprimées. L'invention est ainsi apte à résoudre le problème lié à la détection erronée d'une pluralité de sources sonores au lieu d'une seule source sonore correcte, dans un cas où les contributions de ladite source sonore unique correcte au champ sonore sont fortement dispersées du point de vue directionnel.

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