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Topic: Ambient noise level

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Noise cancellation

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Federal Standard 1037C

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	NPC Law Library: Los Angeles Noise Ordinance
		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.nonoise.org /lawlib/cities/losangel.htm (3302 words)

	System Noise Level
		System-noise level includes self noise generated by the vessel, ambient noise that exists in the water, and reverberation noise which is a function of the propagation paths and configuration of the acoustic system.
		Ambient noise is that background noise level that exists in the ocean due mainly to marine life and man-made noise.
		The significance of the noise levels shown in Figure 1 is that the dominant noise level (self noise) that is present during bathymetric operations is often given relative to the spectrum levels shown.
	www.oceandata.com /equations/sys_noise.htm (729 words)

	Spartanburg SC \| GoUpstate.com \| Spartanburg Herald-Journal
		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.
		Ambient noise level is measured with a sound level meter.
	www.goupstate.com /apps/pbcs.dll/section?category=NEWS&template=wiki&text=ambient_noise (297 words)

	Ambient noise level - Wikipedia, the free encyclopedia
		In telecommunications, ambient noise level or room noise level is the level of acoustic noise existing at a given location, such as in a room, in a compartment, or at a place out of doors.
		Ambient noise level is measured with a sound level meter.
		It is usually measured in dB above a reference pressure level of 0.00002 Pa, i.e., 20 μPa (micropascals) in SI units.
	en.wikipedia.org /wiki/Ambient_noise_level (132 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.
		Ambient noise means the all-encompassing noise associated with a given environment, being usually a composite of sounds from many sources, near and far.
		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.
	www.ci.gilbert.az.us /ordinances/noiseordinance.cfm (1963 words)

	Caltrans Online Training-Highway Noise Measurements and Instrumentation
		Ambient noise is the combined noise level of all noise sources present at the moment of a measurement, including all noise sources of interest.
		Background noise is the combined noise level of all sources present at the moment of measurement, excluding the noise sources of interest.
		So, if the background noise level is at least 10 decibels lower than the ambient noise level, the ambient noise level can be assumed to be controlled by noise from the highway.
	www.dot.ca.gov /hq/env/noise/online_training_module2/slides/slide7.htm (281 words)

	Chapter-12-32 (Site not responding. Last check: 2007-10-19)
		The exterior noise level generated by the drilling or redrilling operation shall be continuously monitored to ensure conformance to the noise level standards.
		In the event the ambient noise level exceeds the fifth noise limit category, the maximum allowable noise level under said category shall be increased to equal the maximum ambient noise level.
		If the difference between the noise levels with noise source operating and not operating is four decibels or greater, then the noise measurement of the alleged source can be considered valid with a correction applied to account for the contribution of the ambient noise.
	www.ci.long-beach.ca.us /apps/cityclerk/lbmc/title-12/chapter-12-32.htm (732 words)

	Noise - Albuquerque's Environmental Story
		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.
		Noise ordinances have been effective in reducing those irritable, noisy occurrences that can be controlled by developing standards and placing the responsibility on the noise maker.
	www.cabq.gov /aes/s5noise.html (1172 words)

	02/14/2005 - Frequency of evaluating audiometric testing rooms to meet the specifications in Appendix D of the ...
		The intent of the ambient noise level requirements in the OSHA standard is to assure that the hearing test is conducted in an environment that will assure valid and accurate test results.
		For a sound booth that never moves once it is stationed, the ambient noise levels may not need to be measured more than once a year, typically at the time of the annual and/or exhaustive calibration.
		Noise levels can change constantly depending on what is going on in the immediate surrounding area (i.e., outside traffic, air conditioning going on and off, disturbing noise from the clanking of shoes, phones ringing, etc.).
	www.osha.gov /pls/oshaweb/owadisp.show_document?p_table=INTERPRETATIONS&p_id=25072 (632 words)

	NPL Acoustics: Ambient noise limits for industrial audiometry
		Results for the masking of pure tones, obtained with seven different noise spectra from 17 test subjects at frequencies of 0.5, 1 and 2 kHz using a self-recording audiometer, are shown together with a full analysis of the associated variances.
		A chart is included showing the audiometric error which can occur due to noise masking for different combinations of ambient noise and subjects' hearing threshold level.
		It is shown that the only satisfactory way to rate ambient noise for audiometric interference is by frequency analysis, in particular, by the sound pressure level in the 1/3-octave band at 0.5 kHz.
	www.npl.co.uk /acoustics/publications/articles/473.html (234 words)

	Town of Truckee DC Chapter 18.44
		If the intruding noise source is continuous and cannot reasonably be discontinued or stopped for a time period to allow measurement of the ambient noise level, the noise level measured while the source is in operation shall be compared directly to the applicable noise level standards in Table 3-8.
		The noise level standard applicable to the emission of sound from regulators, transformers, and associated equipment in electrical substations shall be 60 dB(A).
		Whenever a new office, commercial, hotel/motel, or light industrial use is proposed on a parcel where the existing ambient noise levels may exceed 70 dB(A) CNEL, the land use permit application shall include an acoustical analysis of the affect of noise sources on the use.
	www.townoftruckee.com /DCCh044.html (1878 words)

	Untitled Document (Site not responding. Last check: 2007-10-19)
		The ambient noise level shall be measured as an average sound level during a five-minute period as measured with a precision sound level meter, using slow response and "A-weighting" and with the noise source at issue silent.
		If the intruding noise source is continuous and cannot be reasonably discontinued or stopped for a time period whereby the ambient noise level can be measured, the ambient noise level shall be determined by traveling away from the noise source to a point where a steady state decibel reading is achieved.
		The noise control officer may grant the sound amplification permit if he or she determines that the sound amplification will be conducted in such a manner as not to unreasonably disturb the neighbors of other persons in the vicinity of the site and that the measures, if implemented, will be adequate.
	www.arcatacityhall.org /municode/IV-3.html (2484 words)

	Noise Free America - Model Ordinances: Los Angeles, California
		(c) Any noise level caused by such use or operation which exceeds the ambient noise level on the premises of any other occupied property, or if a condominium, apartment house, duplex, or attached business, within any adjoining unit, by more than five (5) decibels shall be a violation of the provisions of this section.
		Noise due to construction or repair work shall be regulated as provided by Section 41.40 of this Code.
		As to create any noise which would cause the noise level on the premises of any occupied residential property, or if a condominium, apartment house or duplex, within any adjoining unit, to exceed the ambient noise level by more than five (5) decibels.
	www.noisefree.org /cityord/losangeles.html (3311 words)

	Section 7.25.010 Exterior sound level limits.
		In the event the ambient noise level exceeds the fifth noise limit category, the maximum allowable noise level under said category shall be increased to reflect the maximum ambient noise level.
		If for any reason the alleged offending noise source cannot be shut down, then the ambient noise must be estimated by performing a measurement in the same general area of the source but at a sufficient distance that the offending noise is inaudible.
		Where the intruding noise source is an air-conditioning unit or refrigeration system which was installed prior to the effective date of this chapter, the exterior noise level when measured at the property line shall not exceed sixty dBA for units installed before 1-1-80 and fifty-five dBA for units installed after 1-1-80.
	www.riversideca.gov /municipal_code/Title_07/25/010.html (382 words)

	Section 9.16.020 Definitions. (Site not responding. Last check: 2007-10-19)
		For the purpose of this chapter, "ambient noise level" is the level obtained when the noise level is averaged over a period of fifteen 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.
		E. "Sound level" (noise level) in decibels is sound measured using the "A" weighting network of a sound level meter.
		Slow response of the sound level meter needle shall be used except where the sound is impulsive or rapidly varying in nature in which case fast response shall be used.
	www.ci.signal-hill.ca.us /city_clerk/municipal_code/Title_9/16/020.html (375 words)

	Nat' Academies Press, Ocean Noise and Marine Mammals (2003)
		The addition of the anthropogenic component of noise during the Industrial Revolution, principally the result of shipping, is reviewed, followed by a summary of existing data on long-term trends in shipping noise levels and a discussion of various indicators for evaluating and predicting shipping noise levels.
		Preindustrial Noise One approach to modeling long-term trends is to hypothesize that the overall background noise level remained essentially constant until the onset of the Industrial Revolution in 1850.
		The noise associated with whales is expected to asymptote at preexploitation levels as the whale populations return to their preexploitation numbers.
	books.nap.edu /openbook/0309085365/html/27.html (5150 words)

	VictorySiren.com - Siren Coverage Standards
		Average ambient background noise level is estimated to be less than 30 dBC; therefore, sirens should provide sound pressure level of at least 40 dBC in these areas.
		Average ambient background noise level is estimated to be 40 dBC; therefore, sirens should provide sound pressure level of at least 50 dBC in these areas.
		Average ambient background noise level is estimated to be 70 dBC; therefore, sirens should provide sound pressure level of at least 80 dBC in these areas.
	www.victorysiren.com /x/standards.htm (358 words)

	Ambient noise level -- Facts, Info, and Encyclopedia article (Site not responding. Last check: 2007-10-19)
		In ((often plural) systems used in transmitting messages over a distance electronically) telecommunications, ambient noise level or room noise level is the level of acoustic noise existing at a given location, such as in a room, in a compartment, or at a place out of doors.
		Ambient (The amplitude level of the undesired background noise) noise level is measured with a sound level meter.
		It is usually measured in (A logarithmic unit of sound intensity; 10 times the logarithm of the ratio of the sound intensity to some reference intensity) dB above a reference pressure level of 0.00002 Pa, i.e., 20 μPa (micropascals) in SI units.
	www.absoluteastronomy.com /encyclopedia/a/am/ambient_noise_level.htm (180 words)

	Re: When rarefactions are closer together, why is vibrations interpreted clear?
		Ambient noise in our radio example may be the rustling of leaves, traffic noise, wind noise, etc. Ambient noise is usually evenly distributed in the surrounding environment because it comes from so many different sources.
		This noise level will be approximately the same everywhere in the environment so it will remain at 60 dB even at different locations.
		However, as you walk away from the radio, the high pitches will be covered up by the ambient noise much sooner compared to the low-pitched sounds because the high-pitched sounds are less loud to begin with.
	www.madsci.org /posts/archives/2000-03/951966487.Ph.r.html (822 words)

	Section 13.40.050 Exterior noise standards.
		The noise standards for the various categories of land use identified by the noise control office(r) as presented in Table 13.40-1 or 13.40-2 shall, unless otherwise specifically indicated, apply to all such property within a designated zone.
		If the intruding noise source is continuous and cannot reasonably be discontinued or stopped for a time period whereby the ambient noise level can be measured, the ambient noise level may be determined by traveling away from the noise source to a point where a steady state decibel reading is achieved.
		Industrial noise limits are intended primarily for use at the boundary of industrial zones rather than for noise reduction within the zone.
	www.ci.berkeley.ca.us /bmc/Berkeley_Municipal_Code/Title_13/40/050.html (422 words)

	Acoustics Monitoring Program
		Finally, whether or not a particular acoustic signal can be detected in the ocean is a factor of the level of the signal of interest relative to the background noise level of the ocean, or ambient noise.
		This is normally expressed as a "signal to noise ratio" (SNR), where any value greater than 1 implies that the signal is detectable above the noise, while a number below 1 implies that the signal is "buried" in the noise.
		First, the ambient noise field of the ocean is quite variable with respect to time, location, and frequency.
	www.pmel.noaa.gov /vents/acoustics/tutorial/10-signal-noise.html (302 words)

	Door Phones and Night Ringers
		A low level output of the detected audio, transformer-isolated from the input, is also made available for use with other equipment.
		The Bogen Ambient Noise Sensor system is designed to monitor continuously changing ambient noise levels and electronically adjust the level of a page announcement and/or background music so intelligibility is maintained.
		The system ensures that page announcements and music are audible even during periods of high noise levels by continuously monitoring the ambient noise level through a microphone module located in the subject area and adjusting the paging signal level into the system’s amplifier.
	www.bogen-paging.com /catalog/dept/dept_45.aspx (638 words)

	Integrating Environmental Considerations into the Economic Decision-Making Process
		The average equivalent sound level measurement in each district in Shanghai in 1994 showed that the day-time noise in ChangNing district is the loudest and in PuTuo the lowest, while the night-time noise in MingHang district is the loudest and in Jin'an district the lowest.
		The traffic noise pollution in Shanghai is assessed by the traffic noise pollution index (TNPI)*.
		Following GB3096-93, the Ambient Noise Standard in Urban Area, the monitored noise can meet the standard limits in class 2 zones where there is a cross-section of residential, commercial, and industrial land uses.
	www.unescap.org /drpad/publication/integra/modalities/china/4ch03a03.htm (345 words)

	"Parivesh", a Newsletter of CPCB, Delhi (Site not responding. Last check: 2007-10-19)
		Nov, 1999), continuous noise level monitoring was conducted at Kamla Nagar and the noise level was observed ranging between 66.1 dB(A) and 84.4 dB(A).
		The noise level (Leq) on Deepawali day was found between 72.3 dB(A) and 91.8 dB(A) for short duration monitoring at all the locations during 1997, whereas it was found between 66.0 dB(A) and 103.0 dB(A) during 1998.
		The maximum instantaneous noise level in first response recorded was 107.0 dB(A) at East Arjun Nagar in 1997, whereas it was 125.0 dB(A) at Lajpat Nagar in 1998.
	envfor.nic.in /cpcb/newsletter/high99/chap6.html (273 words)

	Classroom Noise Level Chart - (Site not responding. Last check: 2007-10-19)
		Background noise is a significant contributing factor to poor intelligibility in classrooms.
		Record the classroom ambient noise level (unoccupied) and approximate speech and noise levels on the...
		Because the ambient noise level remains constant, the SNR - and...
	classroom.fmqg.com /index.php?k=classroom-noise-level-chart (1189 words)

	CIEH Policy \| Consultation Responses \| The Mayor’s Draft London Ambient Noise Strategy (Site not responding. Last check: 2007-10-19)
		Noise monitoring undertaken by TFL needs to include private roads and contractors should be required (by contract) to replace road surfaces that have deteriorated to the extent of causing noise.
		The policy should be to tackle aircraft noise in such a way as not to be constrained by the 57dB contour.
		Ambient noise affectively unmasked by increased sound insulation within dwellings can serve to distort strategic priorities.
	www.cieh.org /about/policy/responses/london_noise_June03.htm (1302 words)

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