Lexicon Overview
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Air-borne sound attenuation
Air-borne sound attenuation is the weakening of an air-borne sound event by means of sound-absorbing materials. Most effective for this purpose are absorber materials that present a large surface area with open pores through which the sound waves can enter. The resulting oscillation of the air molecules inside the pores converts the sound energy into heat due to friction losses at the pore walls.
Anechoic chamber/acoustically dead room
An anechoic chamber is an acoustic laboratory the inner surfaces of which are covered with sound absorption materials in order to (almost) completely eliminate the reflection of sound waves.
Sound deadening
In the case of machines, appliances and vehicle components, noise emissions are often caused by the inherent vibration of the casing. Effective noise control involves sound deadening measures that minimize these vibrations. For this purpose, heavy layers are applied to the respective metal surfaces to increase their mass.
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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.