Multi-channel surround sound mastering and reproduction...

H - Electricity – 04 – S

Patent

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H04S 3/02 (2006.01)

Patent

CA 2406926

Techniques of making a recording of or transmitting a sound field from either multiple monaural or directional sound signals that reproduce through multiple discrete loud speakers a sound field with spatial harmonics that substantially exactly match those of the original sound field. Monaural sound sources are positioned during mastering to use contributions of all speaker channels in order to preserve the spatial harmonics. If a particular arrangement of speakers is different than what is assumed during mastering, the speaker signals are rematrixed at the home, theater or other sound reproduction location so that the spatial harmonics of the sound field reproduced by the different speaker arrangement match those of the original sound field. An alternative includes recording or transmitting directional microphone signals, or their spatial harmonic components, and then matrixing these signals at the sound reproduction location in a manner that takes into account the specific speaker arrangement. The techniques are described for both a two dimensional sound field and the more general three dimensional case, the latter based upon using spherical harmonics.

L'invention concerne des techniques permettant d'enregistrer ou de transmettre un champ de signaux sonores monauraux ou directionnels multiples qui reproduisent par des haut-parleurs discrets multiples un champ sonore ayant des harmoniques spatiaux qui correspondent sensiblement exactement à celles du champ sonore d'origine. Des sources de sons monauraux sont placées pendant la prise de son pour utiliser des contributions de toutes les voies de locuteur afin de préserver les harmoniques spatiales. Si un ensemble particulier de locuteurs est différent de ce que l'on considère pendant la prise de son, les signaux locuteur sont rematricés à domicile, au théâtre ou autre lieu de reproduction sonore de telle façon que les harmoniques spatiales du champ sonore reproduit par les différents ensembles locuteurs correspondent à celles du champ sonore d'origine. Une alternative comporte l'enregistrement ou la transmission de signaux de microphone directionnel, ou de leurs composantes harmoniques spatiales, et ensuite le matriçage de ces signaux au niveau du lieu de reproduction sonore de telle manière que l'on tienne compte de l'ensemble locuteur spécifique. Les techniques sont décrites à la fois pour un champ sonore bidimensional et pour le cas plus général tridimensionnel, ce dernier étant basé sur l'utilisation d'harmoniques sphériques.

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