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Topic: Noise

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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.
External noise is affected by the location of the source and observer, the engine thrust, and a number of factors that influence the overall configuration design.
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".
adg.stanford.edu /aa241/noise/noise.html   (2314 words)

  Noise - Wikipedia, the free encyclopedia
Environmental noise is governed by noise regulations which set maximum recommended levels of sound levels for specific land uses, such as residential areas, schools, areas of outstanding natural beauty, or factories.
Noise is often generated deliberately and used as a test signal.
In video and television, noise refers to the random dot pattern that is superimposed on the picture as a result of electronic noise, the 'snow' that is seen with poor (analog) television reception or on VHS tapes.
en.wikipedia.org /wiki/Noise   (1168 words)

 Noise music - Wikipedia, the free encyclopedia
"Noise" music is regarded by some as a contradiction in terms, because "noise" is generally defined as unwanted and undesigned or unintentional sound and music as the opposite (see Definition of music).
Noise music is loosely related to industrial, sharing its DIY ethos, independence and ethic of using "non-musical" sources.
Power noise is comparatively conventionally musical, and is not to be confused with power electronics, the synthesizer based subgenre of abstract and experimental noise performed by Whitehouse.
en.wikipedia.org /wiki/Noise_music   (1553 words)

 NOISE   (Site not responding. Last check: 2007-11-06)
Noise is not merely auditory as in the static on radio but may also be visual as in a blurred picture.
The analogy between noise and thermodynamic entropy is suggested by the fact that in any communication process, noise can only increase and it does so at the expense of the amount of information transmitted from a sender to one or more receivers.
Noise is the logical complement of equivocation and undesirable from the receiver's perspective.
pespmc1.vub.ac.be /ASC/NOISE.html   (186 words)

 Students — Noise
Tolerance to noise is influenced by the degree of acclimatisation (how we get used to it), the level and type of intruding noise and the level of the background noise at the time.
An "unreasonable noise" exists when the prescribed item can be heard in a habitable room of a neighbouring house during a prohibited time regardless of whether or not the windows or doors are open.
Noise can be unreasonable at any time if it is too loud or goes on for an unreasonable length of time.
www.epa.vic.gov.au /Students/Noise   (624 words)

 Noise: Digital Imaging: Glossary: Learn: Digital Photography Review
Noise in digital images is most visible in uniform surfaces (such as blue skies and shadows) as monochromatic grain, similar to film grain (luminance noise) and/or as colored waves (color noise).
Noise also increases as pixel size decreases, which is why digital compact cameras generate much noisier images than digital SLRs.
Noise is typically more visible in the red and blue channels than in the green channel.
www.dpreview.com /learn/?/Glossary/Digital_Imaging/Noise_01.htm   (451 words)

The noise is generated primarily by the single small fan in the system unit used to cool the electronics or by the spinning hard disk drive.
Workstation noise levels are not high enough to cause hearing damage, and only seldom does the noise from a workstation cause problems with communication or impair performance.
Noise control engineers are striving to lower noise levels of workstations, while at the same time studying and identifying the psychoacoustical aspects of particular noises that most contribute to annoyance.
www.pc.ibm.com /ww/healthycomputing/vdt18.html   (507 words)

 BostonNoise FAQ
Noise is usually produced either by using non-musical instruments in a musical context, or by using musical instruments in a traditionally non-musical way.
Noise music actually has its roots in twentieth-century classical music, but these experiments were usually limited to the academic world.
Noise rock is also extremely popular in Japan; KK Null and Keiji Haino both release experimental noise in addition to being in rock bands.
www.bostonnoise.org /noisefaq.htm   (3769 words)

 FAQ: Is Noise a Problem for Wind Turbines?   (Site not responding. Last check: 2007-11-06)
Noise was an issue with some early wind turbine designs, but it has been largely eliminated as a problem through improved engineering and through appropriate use of setbacks from nearby residences.
Aerodynamic noise has been reduced by adjusting the thickness of the blades' trailing edges and by orienting blades upwind of the turbine tower.
A small amount of noise is generated by the mechanical components of the turbine.
www.awea.org /faq/noisefaq.html   (143 words)

 Aviation and the Environment
Noise abatement procedures enable reduction of noise during aircraft operations to be achieved at comparatively low cost.
Noise concerns have led some States, mostly developed countries, to consider banning the operation of certain noisy aircraft at noise-sensitive airports.
For example, restrictions should be based on the noise performance of the aircraft and should be tailored to the noise problem of the airport concerned, and the special circumstances of operators from developing countries should be taken into account (Appendix E of Assembly Resolution A33-7).
www.icao.int /icao/en/env/noise.htm   (1099 words)

 Noise, Lewes District Council
If you experience a noise problem, the first step to take is to approach the person creating the noise and gently discuss the issue with him to try to resolve issue.
The majority of noise problems can be resolved amicably by talking to the responsible person, as they may be unaware their activities are causing a disturbance, avoiding the need for Environmental Health involvement.
Noise levels should be minimised where possible and machinery fitted with silencing devices where practicable.
www.lewes.gov.uk /policing/1027.asp   (953 words)

 HeadLight Journal: Noise >> Essay by Tom Panarese & Atom Light   (Site not responding. Last check: 2007-11-06)
Noise is unavoidable, and sometimes it is irritating or annoying.
Noise is also intentional; it has evolved as a way for humans to communicate in thousands of languages.
Noise is money; consider the capitalist automation of Britney Spears as a commodity; her highly evolved form of noise is a desire to make money while also making a stab at immortality.
www.headlightjournal.com /essays/noise/essay.html   (1270 words)

 Noise   (Site not responding. Last check: 2007-11-06)
Excessive noise destroys delicate nerve cells in the inner ear that transmit sound messages to the brain.
Noise mostly damages the parts of the inner ear that process high frequency sound.
Noise starts to be a risk to hearing when it is about as loud as heavy city traffic (about 85 decibels).
www.nohsc.gov.au /OHSInformation/NOHSCPublications/factsheets/nois21.htm   (1070 words)

 Waveform Noise - Succeed in Physical Science
It is called white noise because it consists of a full spectrum of waveform frequencies, similar to how white light is a combination of a full spectrum of visible colors.
One example of electrical noise that is added to your home current can be caused by a nearby electric motor that may create an additional regular signal, which can add to your normal AC signal.
Typically the noise is not regular, thus you take its average to determine the effect on the listener.
www.school-for-champions.com /science/noise.htm   (1014 words)

 On Noise, by Arthur Schopenhauer
The most inexcusable and disgraceful of all noises is the cracking of whips -- a truly infernal thing when it is done in the narrow resounding streets of a town.
Every time this noise is made, it must disturb a hundred people who are applying their minds to business of some sort, no matter how trivial it may be; while on the thinker its effect is woeful and disastrous, cutting his thoughts asunder, much as the executioner's axe severs the head from the body.
The general toleration of unnecessary noise -- the slamming of doors, for instance, a very unmannerly and ill-bred thing -- is direct evidence that the prevailing habit of mind is dullness and lack of thought.
www.mgilleland.com /asonnoise.htm   (1689 words)

 NPC Online Library
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.
Urban Noise Survey (1977), an EPA national survey of public reaction to noise exposure in 24 urban settings (settings with unusually loud highway or airport noise were excluded).
Noise: A Hazard for the Fetus and Newborn.
www.nonoise.org /library.htm   (2224 words)

 Noise Damages the Hearing and May Cause Hearing Loss, Hearing Impairment and Tinnitus: Hear-it
Noise was seen as the cause in 33.7 percent of the cases in a 1994 survey.
In areas with an average noise level from the planes of 55 dB, the incidence of high blood pressure increased by 60 percent.
Another report from the same agency found that traffic noise accounted for 8 percent of the cost related to traffic (while the majority of spending relates to accidents and air pollution).
www.hear-it.org /list.dsp?forside=yes&area=140   (464 words)

 Noise (Gotham Gazette. July 12, 2004)
Exposure to noise at 85 decibels -- roughly the sound of a noisy restaurant -- for more than eight hours could damage a person’s hearing.
But noise complaints were still on the rise in many of the designated areas, such as Westchester Avenue in the Bronx.
“The noise from patrons to and from neighborhood clubs is by far the largest sources of noise in my neighborhood,” said Kathy K.
www.gothamgazette.com /article/issueoftheweek/20040712/200/1034   (1985 words)

 AFSCME Health and Safety Fact Sheet - Noise
Whether the job is a clerical position in an office environment, a heavy equipment operator in a landfill, or a lab worker in a hospital, noise is everywhere and Noise-Induced Hearing Loss is a serious consequence to the health of AFSCME members.
Vibration isolation pads may be installed under the legs of noisy equipment to reduce noise generated by the equipment vibrating on a cement floor.
Increase the distance between the worker and noise producing equipment: By doubling the distance from the worker to the noise source, the noise levels may be reduced to one fourth.
www.afscme.org /health/faq-nois.htm   (1411 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.
Noise from emergency vehicles which is emitted during an actual emergency.
If any person or subsection of this section shall be held to be invalid by a court of competent jurisdiction, then such person or subsection shall be considered separately and apart from the remaining provisions or subsections of this section, which shall remain in full force and effect.
www.noisefree.org /cityord/boston.html   (1371 words)

 Right to Quiet Society - FAQ
Noise causes stress, which is a leading cause of illness and suicide.
Noise bylaws and ordinances vary widely from one municipality to another and do not even exist in some towns and cities.
Where they exist, they may contain a general prohibition against making noise that is a nuisance to other people, or they may set out specific guidelines for the level of noise allowable at certain times of the day and for certain activities.
www.quiet.org /faq.htm   (1225 words)

 EPD - Noise
Noise is a common subject of complaint in Hong Kong and reducing it has been a priority for the EPD since the department was established in 1986.
Aircraft noise is controlled by the Civil Aviation Department, which monitors the noise and requires quieter practices such as noise abatement procedures during take-off.
Their noise is controlled under the Noise Control Ordinance, as is neighbourhood noise, noise from intruder alarms and noise from newly-registered motor vehicles, which are required to meet standards in line with those of Europe and Japan.
www.epd.gov.hk /epd/english/environmentinhk/noise/noise_maincontent.html   (1194 words)

The Noise Element of the Thousand Oaks General plan was adopted and last updated in September of 1987.
The data presented showed that the increase in the noise level through-out Thousand Oaks is principally caused by vehicle traffic on freeways and arterial streets in the city.
Noise has become a key factor in the perception of the quality of our environment.
www.thousand-oaks.org /noise.htm   (1200 words)

Noise problems from a specific vehicle, including car stereos, should be directed to the Hillsborough County Sheriff’s Office at (813) 247-8000, the Tampa Police Department at (813) 276-3704, the Temple Terrace Police Department at
Noise which can be categorized as disturbance of the peace may be reported to the Hillsborough County Sheriff’s Office at (813) 247-8000, the Tampa Police Department at (813) 276-3704, the Temple Terrace Police Department at
The EPC noise rule addresses such concerns by requiring that reasonable precautions be taken during certain hours of operation.
epchc.org /Noise.htm   (523 words)

Noise is an inescapable part of everyday life - the television, a plane flying overhead, a faulty muffler on the passing car, dogs barking, children laughing.
What may be a disturbing noise for one person may be a pleasant sound for someone else.
When complaints are made about noise, try to identify which specific characteristic of the noise is offensive so control measures can be explored.
www.healthgoods.com /Education/Health_Information/General_Health/noise.htm   (1849 words)

 noise - a definition from Whatis.com
Noise is unwanted electrical or electromagnetic energy that degrades the quality of signals and data.
Noise occurs in digital and analog systems, and can affect files and communications of all types, including text, programs, images, audio, and telemetry.
In general, noise originating from outside the system is inversely proportional to the frequency, and directly proportional to the wavelength.
whatis.techtarget.com /definition/0,,sid9_gci212667,00.html   (405 words)

 Noise, CDFS-190-98
Noise is an inescapable part of everyday life - the television, a plane flying overhead, a faulty muffler on the passing car, dogs barking, children laughing.
Noise pollution is an increasing problem in developing countries with the noises associated with road traffic being the major contributor.
When noise sources are diffused, isolating people with dividers may offer some relief if they are at least 5 feet high and are placed as close to the floor as possible.
ohioline.osu.edu /cd-fact/0190.html   (1892 words)

 Noise - Hear Today Gone Tomorrow
Both the amount of noise and the duration of exposure determine the ability to damage hearing.
Workers may be exposed to noise from many sources: equipment, vehicles, or tools, to name a few.
Noise reduced at its source should be the first consideration.
www.scif.com /safety/safetymeeting/Article.asp?ArticleID=81   (969 words)

 noise - Definitions from Dictionary.com
Noise is the general word and is applied equally to soft or loud, confused or inharmonious sounds: street noises.
Clamor is loud, usually sustained noise, as of a public outcry of dissatisfaction: "not in the clamor of the crowded street" (Henry Wadsworth Longfellow); a debate that was interrupted by a clamor of opposition.
A less obvious form of noise is quantisation noise, such as the error between the true colour of a point in a scene in the real world and its representation as a pixel in a digital image.
dictionary.reference.com /browse/noise   (1072 words)

 BBC NEWS | Science/Nature | The deafening sound of the seas
It says key sources of undersea noise are the search for oil and gas, and the use of low-frequency military sonars.
It says there is evidence that noise is causing hearing loss in cetaceans (whales, dolphins and porpoises), injuring them and causing them to strand themselves, and is sometimes killing them.
The WDCS says the frequency ranges of some noise sources of human origin may be blotting out other, biologically important sounds, preventing mothers and calves from staying in touch and masking sound cues for predators and their prey.
news.bbc.co.uk /2/hi/science/nature/3680086.stm   (462 words)

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