Abstract: The main subject matter of the invention is a ventilation device including at least one duct intended to channel an air flow in an air flow direction inside the duct, the ventilation device including at least one acoustic attenuation member at least partially arranged around the duct and made up of a network of resonators, each resonator having at least one cavity and one neck connecting the cavity to the duct, the resonators that make up the network of resonators being distributed at least parallel to the air flow direction. A distance separating two necks varies along a direction parallel to the air flow direction and in that a volume of the cavities varies along the direction parallel to the air flow direction.

Abstract: The invention relates to an assembly (10) comprising a vibrating source (20) capable of dissipating vibrational energy (ev); a radiating source (30) capable of generating acoustic waves from the vibrational energy (ev); at least one compressible member (40) which is in contact with the vibrating source (20) and the radiating source (30); the assembly (10) being characterised in that the compressible member (40) is mounted so as to be compressed between the vibrating source (20) and the radiating source (30) in such a way as to dampen the acoustic waves.

Abstract: The invention relates to an assembly (10) comprising a vibrating source (20) capable of dissipating vibrational energy (ev); a radiating source (30) capable of generating acoustic waves from the vibrational energy (ev); at least one compressible member (40) which is in contact with the vibrating source (20) and the radiating source (30); the assembly (10) being characterised in that the compressible member (40) is mounted so as to be compressed between the vibrating source (20) and the radiating source (30) in such a way as to dampen the acoustic waves.