Acoustic attenuation device with active double wall
AssigneeCentre Scientifique Et Technique Du Batiment
InventorsLaurent Gagliardini, Jacques Roland
Life of this patent
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Abstract
An active double wall comprises two parallel plates defining a rectangular space. Four sensors are positioned between the plates so as to detect noises in said space, and four actuators are place between the plates to emit counter-noises in the space. The actuators are phase-controlled by a control unit in order to minimize the sum of the outputs of the sensors. The actuators are respectively positioned at the centers of the sides of the rectangular space, and the sensors are each positioned on a respective long side of the rectangular space at a distance of one quarter of the length of a long side with respect to a respective corner of the rectangular space, or vice-versa.
Claims10
Acoustic attenuation device, comprising two substantially parallel plates defining a rectangularly shaped internal space therebetween, noise detection means arranged between the two plates, inverse noise emission means arranged between the two plates, and control means for controlling the inverse noise emission means in such a way as to minimize a quantity supplied by the noise detection means, wherein the inverse noise emission means comprise four actuators whose respective positions parallel to the plates correspond approximately to the centers of the sides of the rectangular shape of said internal space, wherein the noise detection means comprise four sensors whose respective positions parallel to the plates correspond approximately to four points each situated on a respective long side of the rectangular shape of said internal space and each having a distance of one quarter of the length of a long side with respect to a respective corner of said rectangular shape, wherein the four actuators are controlled in phase, and wherein the quantity to be minimized is represented by the sum of the output signals of the four sensors.
Acoustic attenuation device, comprising two substantially parallel plates defining a rectangularly shaped internal space therebetween, noise detection means arranged between the two plates, inverse noise emission means arranged between the two plates, and control means for controlling the inverse noise emission means in such a way as to minimize a quantity supplied by the noise detection means, wherein the noise detection means comprise four sensors whose respective positions parallel to the plates correspond approximately to the centers of the sides of the rectangular shape of said internal space, wherein the inverse noise emission means comprise four actuators whose respective positions parallel to the plates correspond approximately to four points each situated on a respective long side of the rectangular shape of said internal space and each having a distance of one quarter of the length of a long side with respect to a respective corner of said rectangular shape, wherein the four actuators are controlled in phase, and wherein the quantity to be minimized is represented by the sum of the output signals of the four sensors.
Dependencies are inferred from the claim text.