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Topic: Noise Reduction Coefficient

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	Encyclopedia :: encyclopedia : Acoustics (Site not responding. Last check: 2007-10-12)
		In comparison, sound power levels are a measurement of the actual energy being put into use by a given device to create noise.
		Because of environmental factors, and other influences, the amount of energy a device devotes to creating sound may not be equal to the actual level of the sound as it's perceived.
		It is sometimes used as a passive noise control device.
	www.hallencyclopedia.com /Acoustics (1181 words)

	Coefficient
		The Gini coefficient is a measure of inequality of a...
		The Gini coefficient (or Gini ratio) is a summary statistic of the Lorenz curve and a...
		A trinomial coefficient is a coefficient of the trinomial triangle...
	coefficentfriction.feckfriction.com /coefficient (811 words)

	Anderson Hardwood Floors - Noise Reduction (Site not responding. Last check: 2007-10-12)
		There is a way to both reduce the noise and soften the synthetic look: Install hardwood flooring over a cork under layment.
		The ability of a panel or floor to absorb sound is described in terms of its Noise Reduction Coefficient (NRC).
		The higher the NRC, the greater the ability of the floor covering to absorb airborne noise in a room.
	www.andersonfloors.com /And_Encyclopedia/encyclopedia_noisereduction.htm (531 words)

	About Us
		Although noise controls are generally preferable to hearing protectors, these controls are not always practical and carry with them their own set of problems.
		However, in popular usage the term "background noise" is often used to mean the noise in the environment, other than the noise from the source of interest.
		A measurement of "noise reduction" combines the effect of the sound transmission loss performance of structures separating the two areas or rooms, plus the effect of acoustic absorption present in the receiving room.
	www.ies2000atlanta.com /about.htm (4700 words)

	Green Building Encyclopedia - Glossary of Green Building Terms
		Active Noise Cancellation involves reducing a sound field through the interaction of a primary sound source with an actively controlled identical secondary sound that is 180 degrees out of phase.
		Average of the sound absorption coefficient of the four octave bands 250, 500, 1,000, and 2,000 Hertz rounded to the nearest 0.05.
		The STC is calculated from the noise reduction at the 16 one-third octave bands between 125 and 4,000 Hertz.
	www.whygreenbuildings.com /glossary.php (6282 words)

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