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.
Noise control
Noise control includes the full range of measures that help reduce and/or contain noise or even prevent its generation in the first place. Noise control is aimed at preventing health damage caused by exposure to noise.Noise control encompasses all measures that help reduce the transmission of sound between a sound source and a target zone or recipient.
Ultrasound
Ultrasound is defined as sound events with frequencies above the hearing range of the human ear.
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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.
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.