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Topic: Noise level

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	Noise - FAQ
		Noise level increases due to highway projects are usually due to a combination of increased traffic and changes in the roadway alignment.
		These are the noise levels experienced at the commonly used exterior portions of a property on the lowest or ground level for each home or individual unit.
		As noise level changes of 3 decibels or less are not generally perceivable, it is not prudent to construct a noise barrier that gives only a 1 or 2 decibel benefit to adjacent properties.
	www.dot.state.co.us /environmental/CulturalResources/NoiseFAQ.asp (1177 words)

	Noise
		Although internal noise was the major preoccupation of aircraft acoustic engineers for many years and still is important, the noise produced by the aircraft engine and experienced on the ground has become a dominant factor in the acceptability of the airplane.
		Noise maps typically depict the DNL 65dB contour as this is identified by federal guidelines as the threshold level of aviation and community noise that is "significant".
		The sideline noise is measured 1476 ft (450 m) from the runway centerline at a point where the noise level after liftoff is greatest.
	adg.stanford.edu /aa241/noise/noise.html (2314 words)

	Noise Free America - Model Ordinances: Los Angeles, California
		At certain levels noises are detrimental to the health and welfare of the citizenry and in the public interests shall be systematically proscribed.
		Ambient noise shall be averaged over a period of at least 15 minutes at a location and time of day comparable to that during which the measurement is taken of the particular noise source being measured.
		The ambient noise level and the level of a particular noise being measured shall be the numerical average of noise measurements taken at a given location during a given time period.
	www.noisefree.org /cityord/losangeles.html (3311 words)

	NPC Library: Noise Control Terms Made Somewhat Easier
		This dictionary of terms related to noise and noise control is a useful tool for those who are investigating how to reduce the amount of noise pollution in their environment.
		Measured in phons it is numerically equal to the median sound pressure level (dB) of a free progressive 1000 Hz wave presented to listeners facing the source, which in a number of trials is judged by the listeners to be equally loud.
		The levels in octave bands centered at 500, 1000, and 2000 Hz are commonly averaged to determine the speech-interference level.
	www.nonoise.org /library/diction/soundict.htm (3820 words)

	Noise Free America - Model Ordinances: Boston, Massachusetts
		Unreasonable or excessive noise shall be defined as noise measured in excess of 50 dBa between the hours of 11:00 p.m.
		The term dBa shall mean the A-weighted sound level in decibels, as measured by a general purpose sound level meter complying with the provisions of the American National Standards Institute, "Specifications for Sound Level Meters (ANSI SIR 19711" properly calibrated, and operated an the "A" weighting network.
		The police, in response to each complaint, shall verify by use of the sound level meter described herein that the noise complained of does exceed the limit described herein and if so, may thereupon arrest and/or make application in the appropriate court for issuance of a criminal complaint for violation of M.G.L. c.
	www.noisefree.org /cityord/boston.html (1371 words)

	Noise - Albuquerque's Environmental Story
		Noise, commonly defined as unwanted sound, is an environmental phenomenon to which man is exposed before birth and throughout life.
		Noise can also be considered an environmental pollutant, a waste product generated in conjunction with various activities of man. Under the latter definition, noise is any sound--independent of loudness--that may produce an undesired physiological or psychological effect in an individual and that may interfere with the social ends of an individual or group.
		Noise level meters are used to measure the sound level as it is crossing the property line.
	www.cabq.gov /aes/s5noise.html (1172 words)

	NPC Library: Protective Noise Levels
		Noise is defined as "unwanted sound." In the context of protecting the public health and welfare, noise implies adverse effects on people and the environment.
		One method for measuring the changing magnitude of sound levels is to trace a line on a sheet of moving paper, so that the movement of the pen is proportional to the sound level in decibels.
		As is common with annoyance and interference caused by noise, the effects of context and situation may be almost as important as the magnitude or intensity of the source.
	www.nonoise.org /library/levels/levels.htm (6671 words)

	Noise Ordinance
		At certain levels, noises are detrimental to the health, safety and welfare of the citizenry, and in the public interest, such noise shall be systematically proscribed.
		for the purpose of this section, ambient noise level is the level obtained when the noise level is averaged over a period of 15 minutes without inclusion of noise from isolated identifiable sources, at the location and time of day near that at which a comparison is to be made.
		For the purpose of enforcement of the provisions of this section, noise level shall be measured on the a-weighted scale with a sound level meter satisfying at least the applicable requirement for Type 1 sound-level meters as defined in American National Standard Section 1.4-1971 or the most recent revisions thereof.
	www.ci.gilbert.az.us /ordinances/noiseordinance.cfm (1979 words)

	Highway Traffic Noise - FHWA
		The noise level is always changing with the number, type, and speed of the vehicles which produce the noise.
		While it is true that noise levels do vary with changes in pavements and tires, it is not clear that these variations are significant when compared to the noise from exhausts and engines, especially when there are a large number of trucks on the highway.
		If noise impacts are expected, noise-reduction measures that are determined by the State highway agency and the FHW A to be practicable, reasonable, and acceptable to the public must be incorporated into the highway improvement.
	www.fhwa.dot.gov /environment/htnoise.htm (2468 words)

	Noise Shootout of 80mm Case Fans-Best Computer Online Store Houston Buy Discount Prices Texas-Directron.com
		The noise levels of these case fans were measured using the same noise meter, in the same lab and by the same method.
		Typically audio noise level is measured with the microphone kept at one meter away from the object.
		Ambient noise level was measured first and last to ensure that the background noise level remained relatively the same throughout the experiment.
	www.directron.com /noise.html (1997 words)

	Noise Level
		Hamburg Township Ordinance No. 20-A Noise Ordinance Section 6a: “No person shall conduct or permit any activity, including those specific prohibitions listed in Section 5 that produces a OBA at or beyond the property line of the property on which it is conducted which exceeds the levels specified in Table 1”.
		Such noise levels shall be measured on the property line or on the adjacent property which is receiving the noise.
		The generation of noise at a level greater than the normal level of traffic noise at the time of such generation or emission, when determined at the boundary of the property.
	www.mlswa.org /PBWOA-105/noise_level.htm (768 words)

	Noise Ordinance (Site not responding. Last check: 2007-09-10)
		For the purpose of this chapter, ambient noise level is the level obtained when the noise level is averaged over a period of fifteen (15) minutes without inclusion of noise from isolated identifiable sources, at the location and time of day near that at which a comparison is to be made.
		For the purpose of enforcement of the provisions of this chapter, noise level shall be measured on the A-weighted scale with a sound level meter satisfying at least the applicable requirement for Type 1 sound-level meters as defined in American National Standard S 1.4-1971 or the most recent revisions thereof.
		Any noise level exceeding the community noise standard at either the property line or the affected area of any property (or, if a condominium or apartment house, within any adjoining apartment) by more than five (5) decibels shall be deemed to be prima facie evidence of a violation of the provisions of this section.
	www.tempe.gov /codee/noise/default.htm (2763 words)

	Noise Exposure
		When noise levels are determined by octave band analysis, the equivalent A-weighted sound level may be determined from Figure G-9.
		Octave band sound pressure levels may be converted to the equivalent A-weighted sound level by plotting them on this graph and noting the A-weighted sound level corresponding to the point of highest penetration into the sound level contours.
		When the daily noise exposure is composed of two or more periods of noise exposure of different levels, their combined effect should be considered, rather than the individual effect of each.
	www.uvcuring.com /faxinfo/noise/noise.htm (2908 words)

	Noise Levels
		The major noise source is the drive train, particularly the action of the track links as they round over the sprockets, idlers and wheels.
		Noise levels are higher in front and to the side of the muzzle than to the rear.
		Levels below the hatch plane, even with the hatch open, are lower.
	chppm-www.apgea.army.mil /hcp/NoiseLevels.aspx (967 words)

	Noise Reduction at Northland Power's 110 MW Iroquois Falls Cogeneration Plant
		Noise levels were critical in the design of Iroquois Falls because the power plant is located only 2,500 feet east of the paper mill and only 750 feet from the nearest house.
		Because the plant level is 82 feet below the level of the houses, the hill acts as a natural barrier, reducing noise while ensuring optimum cross-ventilation.
		The high level of attenuation of the west and north walls enabled the owner to move the HRSGs from the east side of the facility, behind the shelter of the old river bank, to the northeast corner, where they were directly in-line with residences.
	www.atconoise.com /mediaroom/mediaroom_tech_northland.htm (1910 words)

	Noise control (Site not responding. Last check: 2007-09-10)
		Noise with significant measured levels (in dB) at high or low frequencies will not be as annoying as it would be when its energy is concentrated in the middle frequencies.
		The maximum acceptable background noise level generated by the mechanical systems in buildings is usually specified in terms of average A-weighted sound levels, NC, RC, or NCB.
		The noise criteria (NC) values are determined from the measurements of the octave-band sound levels in an occupied room when the air-conditioning system is on.
	home.tir.com /~ms/noisecontrol/noisecontrol.html (714 words)

	Noise Regulations and Noise Legislation Information by ATCO Noise Management
		Leq is defined as the equivalent continuous sound pressure level, which represents the average of a 24-hour noise history at a location.
		The ambient noise level is symbolized by L90 or L95 (the noise level present 90% or 95% of the time).
		Alberta, Canada - The legislated noise level for rural Alberta varies by residential density and how far away the dwellings are from heavily traveled roads or rail lines.
	www.atconoise.com /solutions/regulations.htm (434 words)

	Aircraft Noise Terminology - Palm Beach International Airport
		The logarithmic conversion of sound pressure to sound pressure level means that the quietest sound we can hear (the reference pressure) has a sound pressure level of 0 dB, while the loudest sounds we can hear without pain have sound pressure levels on the order of 120 dB.
		In simple terms, Ldn or DNL is the average noise level over a 24 hour period except that noise occurring at night (between the hours of 10PM and 7AM) are artificially increased by 10 dB.
		Noise levels for Stage definition of aircraft are measured at three points.
	www.pbia.org /airport/Noise/Terminology.aspx (885 words)

	Chapter 5: Vehicle Noise Emission Level Measurements for Highway Noise Prediction Models - Measurement of ...
		The TNM is used to predict sound levels in the vicinity of highways and to design highway noise barriers.
		The electronic noise floor of the acoustic instrumentation system should be established daily by substituting the measurement microphone with a dummy microphone (See Section 3.1.5).
		The level-mean emission level equation is then adjusted upward by a fixed value, which is a function of the relationship between the level-mean regression and the individual L
	www.fhwa.dot.gov /environment/noise/measure/chap5.htm (2281 words)

	Single event (SENEL) noise measurements
		Single-event noise is the maximum sound level produced by an individual approach overflight at a particular measuring point.
		The noise level is measured in decibels (dB, or dBA).
		noise event chart are produced by aircraft whose flight path is above the glide slope or is displaced horizontally from the approach path.
	www.sierrafoot.org /local/noise/senel.html (664 words)

	Ambient noise level - Wikipedia, the free encyclopedia
		In atmospheric sound transmission or noise pollution, ambient noise level is the sound pressure level at a given location, normally specified as a reference level to study a new intrusive sound source.
		Or roadway noise is measured as ambient sound, prior to introducing a hypothetical noise barrier intended to reduce that ambient noise level.
		Most frequently ambient noise levels are measured using a frequency weighting filter, the most common being the A-weighting scale, such that resulting measurements are denoted dBA, or decibels on the A-weighting scale.
	en.wikipedia.org /wiki/Ambient_noise_level (334 words)

	Teen Workers: Potential Hazards - Strains and Sprains
		Noise induced hearing loss is the second most self-reported occupational illness or injury.
		Workplaces where sound levels are an average of 85 decibels or higher for more than eight hours must have programs to save the hearing of workers.
		Approximate noise levels teens are exposed to in some typical youth occupations.
	www.osha.gov /SLTC/teenworkers/hazards_noise.html (971 words)

	Sound Level Meters and Noise Dosimeters from NoiseMeters
		Noise Signs and Music Controllers to warn of high noise levels in hospitals, clubs and industry.
		For general noise surveys where a noise meter is needed that is quick and simple to use.
		Whether your application is noise in the workplace, environment or community then please just give us a call.
	www.noisemeters.com (245 words)

	Is Noise Killing Off-Road Access? (Site not responding. Last check: 2007-09-10)
		Noise has always been one of the biggest reasons people don't like dirt bikes.
		Noise has always been a major issue, but until a couple of years ago, the trend was towards much more quiet dirt bikes.
		Most of the older louder air cooled bikes have gone to that big riding area in the sky (or are rusting out behind the shed under a tarp), and noise complaints had dropped off as a major issue problem.
	www.motorcycledaily.com /26feb01noiselevel.html (1597 words)

	Noise Level Zero Conferencing System
		Noise Level Zero is a text-based threaded and moderated conferencing system similar to BIX (originally the Byte Information Exchange), CIX, and JIX.
		We attempt to keep the noise at an absolute minimum and the useful content at a maximum.
		Noise Level Zero is funded through subscriptions, not advertising.
	www.nlzero.com (485 words)

	Acoustics.com: Codes & Testing - Noise Level Measurements
		Code: There are a variety of methods for measuring noise levels.
		General Information: There are numerous ways to measure noise, depending on the code in which a noise level measurement is required.
		Strength: Gives a quantitative assessment of noise or potential annoyance verses vague standards, such as “you can’t disturb the peace,” which are left to subjective interpretation.
	www.acoustics.com /noise_measure.asp (173 words)

	Noise Level Analysis (NLA)
		In addition to environmental noise analysis, the software may be used to record virtually any quantity (such as voltage and temperature) as a function of time at a resolution of down to a 1/10th of a second.
		Performing noise level surveys of a given location and ensuring compliance to community noise ordinances are just two of the examples of how you will use the Sound Lab NLA program.
		Lden-A 24-hour Leq, except 5 dB is added to all levels measured between 7:00 pm and 10:00 pm and 10 dB is added to all levels measured between 10:00 pm and 7:00 am.
	www.gold-line.com /tef/t-nla.htm (626 words)

	Daily Noise Dose Level
		Daily noise dose level when exposed in periods with different noise levels
		When the daily noise exposure consists of periods of different noise levels, the daily dose can be calculated as:
		Noise Exposure - Level and Duration Noise exposure should be controlled so that exposure is less than the combination of exposure level and duration.
	www.engineeringtoolbox.com /noise-exposure-level-d_718.html (252 words)

	Noise Monitors for Environmental Measurements
		Sound Level Meters and Noise Monitors suitable for Environmental Noise, Community Noise and similar measurements.
		Shows when the noise levels are too high.
		Cuts the power to the amplifier if the high noise level warnings are ignored.
	www.noisemeters.com /env.asp (478 words)

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