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Sound insulation
Sound insulation is the acoustic shielding of a room or device in order to prevent or reduce the transmission of air-borne or solid-borne sound to neighboring spaces. The aim is to prevent the sound from propagating by using sound insulation materials to build a sound barrier around the noise source.
Threshold of pain
The threshold of pain (or: pain threshold) is the sound pressure level above which people perceive a sound event as being painful. For most people, the acoustic threshold of pain lies between 120 dB and 140 dB.
Solid-borne sound attenuation/damping
Solid-borne sound attenuation is the absorption of solid-borne noise by a layer of suitable material, e.g. heavy foil, on the parts/elements where the solid-borne sound propagates. Solid-borne sound attenuation prevents the conversion of solid-borne sound into air-borne sound. For this purpose, the medium’s surface is covered with a homogeneous layer of acoustic material (adhesive fixation or other) that transforms sound energy into other energy forms.