GetRidofNoise - soundproofing, acoustic foam, sound bafYles, acoustic
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BEFORE
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NOISE - [ACOUSTICS] Sound which is unwanted, either
because of its effect on humans, its effect on fatigue or malfunction of
physical equipment, or its interference with the perception or detection of
other sounds.
McGraw Hill "Access Science" online dictionary www.accessscience.com |
NRC - The Noise Reduction Coefficient of an acoustical material is
the arithmetic average of the nearest multiple of 0.05 of its absorption
coefficients at 4 one-third octave bands with center frequencies of 250, 500,
1000, 2000 Hertz.
STC - Sound Transmission Class - The preferred single class rating system
designed to give the sound insulation properties of a structure for the rank
ordering of a series off structures.
Useful links:
- OSHA - Occupational Safety Health Administration http://www.osha.gov
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- ASTM - American Society for Testing and Materials http://www.astm.org
- INCE-USA - Institute of Noise Control Engineering of the USA http://www.inceusa.org
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