The invention relates to a device for attenuating the intensity of acoustical noise in an air-conditioning circuit of a motor vehicle, and to a circuit including such a device.

Preferred embodiments of the device comprise a silencer having a large volume and a small particle exit opening.

The invention also relates to a floating structure (1) comprising the attenuating device of the invention.

A ventilating system for transport of air in environments with requirements concerning sound comprising a plurality of channel sections and a sound-attenuating device comprising both active and passive sound attenuation.

A slot (10) enables the introduction of a liquid cristal attenuator device (21) connected to an alternating voltage source (V).

A swell reducing device particularly for a so-called incident swell (1) having a given mean direction of propagation (2).

This ensures that there is no build up of gas in the silencer device which tends to increase back pressure and hence lift-off force.

There is provided an attenuator device having a simple structure and capable of selecting output of light of an arbitrary wavelength range from a plurality of output ports.

The invention concerns an installation for producing a nonwoven web wherein the distance between the lower edge (20) of the slit drawing device and the upper edge (21) of the diffuser is maintained constant by uniformly distributed hasps (23).

The optical device includes an attenuator in the housing.

The device can function as an optical circulator, isolator, attenuator or switch.

A fibre optic device which can be used as an attenuator or a sensor.

A power factor correction device, and a controller and a total harmonic distortion (THD) attenuator used by same.

The flow control device (17) comprises a guillotine-type damper (17).

The invention relates to a device for damping noise emissions, preferably on railways, comprising at least one damping body (10) which is allocated to the source of the noise emissions.