Lexicon Overview
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Absorber
Acoustic absorbers are materials that absorb solid-borne resp. air-borne sound. For the absorption of air-borne sound, open-cell foams or fibrous materials such as polyester non-wovens are used, while solid-borne sound absorption relies on absorber layers, e.g. heavy foils, that dampen the vibrations of a solid body.
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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.
Closed-cell foams
In closed-cell foams, the walls between the individual cells are completely closed. As this prevents the penetration of liquids and vapor etc., closed-cell foams are suitable for use also in spaces with increased moisture load.
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.