Active acoustic attenuation device for use in a duct,...

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F16L 55/033 (2006.01) G10K 11/178 (2006.01)

Patent

CA 2233253

A device for the active acoustic attenuation of an acoustic signal propagated through a duct. The device includes at least one first sensor means (2) for sensing a first acoustic signal, an attenuation actuator means (6) outputting an active acoustic attenuation signal in response to a selected control signal, and electronic control means generating the active acoustic attenuation signal for the actuator means. The first sensor means (2) and the actuator means (6) are arranged entirely within the duct in facing positions at a selected distance from the body of the duct, the axis of symmetry of the radiation from the actuator means and the axis of symmetry of the first sensor means (2) are substantially parallel to the acoustic signal propagation direction in the duct, and the actuator means (6) are arranged before the first sensor means (2) in the acoustic signal propagation direction in the duct.

Le dispositif d'atténuation acoustique active d'un signal acoustique se propageant dans un conduit comprend: su moins des premiers moyens capteurs (2) d'un premier signal acoustique, des moyens actionneurs d'atténuation (6) délivrant un signal d'atténuation acoustique active en réponse à un signal de commande choisi, et des moyens électroniques de commande générant le signal d'atténuation acoustique active pour les moyens actionneurs. Les premiers moyens capteurs (2) et les moyens actionneurs (6) sont disposés en totalité à l'intérieur du conduit, en regard les uns des autres, et à une distance choisit de la gaine du conduit, l'axe de symétrie du rayonnement des moyens actionneurs et l'axe de symétrie des premiers moyens capteurs (2) sont sensiblement parallèles à la direction de propagation du signal acoustique dans le conduit, et les moyens actionneurs (6) sont disposés en amont des premiers moyens capteurs (2) selon le sens de propagation du signal acoustique dans le conduit.

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