Lexicon Overview
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Sound pressure level
Sound pressure level Lp is a logarithmic measure of the effective pressure of a sound event and hence its volume. It is measured in decibel (dB).
Infrasound
Infrasound is air-borne sound with a frequency below 20 Hz. As the human ear cannot hear sounds with such low frequencies, infrasound with a low sound pressure level cannot be perceived by humans.
Bending waves/flexural waves
Flexural waves are transversal waves (i.e. perpendicular to the direction of propagation) spreading across panels or along beams. These waves may be (partially) converted to airborne sound, making them audible.
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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.
Noise control
Equipping the room with noise control materials reduces the sound level (and hence the perceived noisiness) and improves speech intelligibility. Such an improvement of acoustic conditions makes for a much more pleasant atmosphere. Porous and fibrous materials such as open-cell foams or non-wovens are excellent sound absorbers. But also closed-cell foams with a special cell structure, for instance our soni RESIST, score with good sound absorption capacity.