Noise control device

G - Physics – 10 – K

Patent

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Details

G10K 11/178 (2006.01) F01N 13/00 (2010.01) B60R 19/48 (2006.01) F01N 1/00 (2006.01) F01N 1/06 (2006.01) F01N 1/22 (2006.01) F16L 55/033 (2006.01) F01N 7/00 (2006.01)

Patent

CA 2112368

- 24 - A noise control device disposed at the outlet of a tail pipe which emits exhaust noise of an automobile to silence noise from the tail pipe comprises a speaker (3) which is arranged near the tail pipe (2) and of which the open surface has a constant angle with respect to a vertical plane, an enclosure (21) which closes the rear portion of the speaker (3), and a silencing sound guide portion (22) which guides silencing sounds emitted from the front surface of the speaker (3) to the outlet of the tail pipe (2). A closed space into which a bumper (23) for absorbing impact in case of collision is made, is used as a resonant-cavity of said speaker (3). Based on the amount of silencing noise which becomes greater as a plurality of microphones (5-1, 5-2, 5-3) are arranged to be closer to the speaker (3, 4), the outputs of the plurality of microphones (5-1, 5-2, 5-3) apart a constant distance from said speaker (3) are synthesized.

- 24 - Dispositif anti-bruit destiné à être monté sur l'extrémité du tuyau arrière d'un système d'échappement de véhicule automobile pour réduire le niveau de bruit émis par le tuyau d'échappement; le dispositif comporte un haut-parleur (3) disposé près du tuyau arrière (2), et dont la surface ouverte est à angle constant par rapport à un plan vertical; une enveloppe (21) ferme la partie arrière du haut-parleur (3), et un guide insonorisant (22) dirige les sons insonorisants émis par la face avant du haut-parleur (3) vers la sortie du tuyau arrière (2). Un espace fermé, aménagé pour loger un amortisseur (23) d'impact en cas de collision, fait également office de cavité de résonance au haut-parleur (3). Selon l'importance du bruit insonorisant, qui augmente en fonction de la proximité d'une pluralité de microphones (5-1, 5-2 et 5-3) par rapport au haut-parleur (3 et 4), les signaux de sortie de la pluralité de microphones (5-1, 5-2 et 5-3) à distance constante du haut-parleur (3) sont synthétisés.

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