Patent ID: 6463156
Filing Date: 2002-10-08
Classification: E01F,G10K

Abstract:
An active device for attenuating the intensity of sound in a defined region, by the emission of antinoise waves, of the type comprisinga set of sensors (30) capable of determining the signals and the directions of the waves emitted by the remote noise sources; means for processing the signals n(t) coming from said sensors and for generating signals an(t) corresponding to the antinoise waves; a set of electroacoustic sources (25), said sources being installed in the space close to the region to be protected and connected to said processing means and being capable of emitting antinoise waves in the same direction and in the same sense as the incident waves, the sensors and the electroacoustic sources being placed in such a way that the incident waves reach the sensors beforehand, wherein the electroacoustic sources (25) are arranged on a continuous surface (24) and in a uniform lattice, this surface constituting a screen which is reflective with respect to sound waves, or optionally absorbent with respect to them.