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noise tools by mas environmental sound level calculation tools that work in your browser. free to use without warranty or guarantee noisetools(at)masenv.co.uk for comments and feedback noise mapping (sound level modelling) create sound level models and noise maps for free in your browser. add point sources, screening barriers, buildings and decibel receiver points with detailed frequency information. see the sound paths and how these are affecting the levels. interact with your model, modifying positions and parameters and see the calculation results instantly. learn through experimentation how the calculations of iso 9613 parts 1 and 2 are implemented and how they affect predicted levels. built into your browser, your model is stored in the location bar making it easy to save and share your interactive models with other people. start noise mapping - works in any modern web browser the tool is still in development and we welcome your feedback you can also access the tool by visiting dbmap.co.uk decibel calculator perform basic arithmetic calculations with decibel sound levels including: + addition - subtraction × multiplication ÷ division % percent the calculator displays the formulae involved in converting from decibel to linear. there is also support for the use of your keyboard and numeric keypad similar to using the built-in calculator on your computer. use the calculator - uses javascript need more advanced noise mapping? click here for more information about the noise mapping services we offer sound propagation calculator updated in 2018 to include double barriers and work on all modern devices . a sound propagation level calculator with interactive diagram. for calculating the sound pressure level of a single source of noise considering sound attenuation due to: propagation over a distance, insertion of up to two barriers, ground effect air absorption using iso 9613 methods of calculation. use the calculator - uses javascript the previous version of this calculator that used adobe flash can still be accessed here multiple noise sources calculator original point source noise calculator - combine up to 3 independent point sources at different distances and durations. use the calculator - uses javascript frequently asked questions (faq) how to combine noise levels? what is different about a sound level calculation? sound levels (decibels) are logarithmic so they do not scale the same as other units of measurement. to understand this better check out our decibel calculator , which provides the formulae to convert the decibel values back to the linear scale and performs calculations such as addition. here are some useful examples: 10db + 10db = 13db 10db + 100db = 100db 3db increase = double the energy, but 10db increase = appears twice as loud. how to calculate sound level at a distance? how does distance affect sound? sound energy propagates outwards in a sphere and therefore reduces in energy based on the "inverse square law". this is easily understood as a reduction in 6db per double of distance. so the reduction from 1m to 2m distance is the same as from 100m to 200m distance. use our sound propagation calculator to calculate this for yourself. how to model sound level reduction there are many aspects to consider when modelling sound level both regarding the laws of physics and environmental effects on the sound. some of the things to consider are: distance attenuation this is a relatively straightforward physical phenomena as mentioned above. screening and diffraction around screens this is frequency dependent and is mostly based on path difference (the difference between the direct path and diffracted path) reflections from surfaces any flat surface can be reflecting. the extent of this depends upon the qualities of the surface and the frequency of the sound. a perfect reflection will increase the level by 3db. this is sometimes called the "façade level". absorption from the ground and reflecting surfaces this depends on the softness of the surface and the frequency of the sound. to understand ground absorption better, check out the section in the noise mapping tool guide. air absorption this is energy lost by friction in the atmosphere and considers the temperature and humidity of the air and the frequency of the sound. meteorological conditions wind speed and direction can considerably affect sound levels. it is usually necessary to consider downwind conditions to minimise these affects. temperature inversion, where the temperature varies considerably at different heights, can also bend sound paths over long distances. use our sound propagation calculator or our sound modelling tool to calculate these values for yourself. what is iso 9613? it is a international standard that describes a method for calculating the attenuation of sound during propagation outdoors in order to predict the levels of environmental noise at a distance from a variety of sources. the method predicts the equivalent continuous a-weighted sound pressure level (as described in iso 1996) under meteorological conditions. our sound propagation calculator and our sound modelling tool calculates sound levels using the methods set out in this document. how accurate are sound level calculations and noise mapping? the accuracy is always going to be limited to the details of the model, which will never quite match the real world conditions perfectly. common problems: if the noise source has inherent directivity this is often not correctly modelled. sound power level calculations may not be accurate as the source of noise changes over time or due to wear. if ground height is quite variable, this may not be possible to model accurately. changing seasons will affect foliage and ground absorption. changing wind and meteorological conditions will affect levels, especially over long distances. complicated reflected paths. there are many other aspects to consider when dealing with multiple reflecting surfaces. absorption of each surface, reverberation or "canyon effect", standing waves. this accuracy is mostly important when there is no direct line of sight. there is more information about accuracy in the noise mapping tool guide. what is a-weighting? why is it so common? the human ear doesn't respond to all frequencies equally. for example: a sound at 1khz will appear much louder than a sound of equal energy at 50hz. a-weighting is a frequency-based adjustment to the decibel level to account for this variance in audibility. it is common to use a-weighted levels db(a) when referring to noise impact as . what is sound power? how do you calculate a sound power level? when you see a decibel level for a source of noise it is usually accompanied by a distance from the source, this is a sound pressure level and indicates how much sound energy is present at this distance. e.g. a compression unit is 70db at 1m distance or 50db at 10m. the sound power level does not contain distance information and instead represents the total acoustic energy of the source of noise, e.g. the same compression unit has a sound power of 81db. using this figure we can calculate the sound pressure level at any distance. we can also estimate the sound power level by using a pressure level with the distance from the source. all of our calculators provide methods for doing this. how can i calculate sound transmission from inside to outside? we are considering adding a calculator for this. if you think it would be beneficial please let us know. latest tweets twitter feed loading... environmental health consultancy noise tools food safety training allergen training ios microphone accessories search twitter find out more about mas environmental at www.masenv.co.uk mas environmental ltd is registered in england and wales. reg no 7501856.

URL analysis for noisetools.net

http://noisetools.net/noisecalculator2
http://noisetools.net/decibelcalculator
http://noisetools.net/noisecalculator2_original
http://noisetools.net/noisecalculator
http://noisetools.net/dbmap
http://noisetools.net/contact
allergentrainingcourses.co.uk
foodsafetytrainingcourses.co.uk
masenv.co.uk
dbmap.co.uk
ios-sound-meter.uk

Whois Information

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Domain Name: NOISETOOLS.NET
Registry Domain ID: 2198636421_DOMAIN_NET-VRSN
Registrar WHOIS Server: whois.register.it
Registrar URL: http://www.register.it
Updated Date: 2017-12-14T16:21:04Z
Creation Date: 2017-12-11T17:10:04Z
Registry Expiry Date: 2018-12-11T17:10:04Z
Registrar: Register.it SPA
Registrar IANA ID: 168
Registrar Abuse Contact Email: [email protected]
Registrar Abuse Contact Phone: +39.5520021555
Domain Status: clientDeleteProhibited https://icann.org/epp#clientDeleteProhibited
Domain Status: clientTransferProhibited https://icann.org/epp#clientTransferProhibited
Domain Status: clientUpdateProhibited https://icann.org/epp#clientUpdateProhibited
Name Server: NS0.PHASE8.NET
Name Server: NS1.PHASE8.NET
Name Server: NS2.PHASE8.NET
DNSSEC: unsigned
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  REGISTRAR Register.it SPA

SERVERS

  SERVER net.whois-servers.net

  ARGS domain =noisetools.net

  PORT 43

  TYPE domain

DOMAIN

  NAME noisetools.net

  CHANGED 2017-12-14

  CREATED 2017-12-11

STATUS
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clientTransferProhibited https://icann.org/epp#clientTransferProhibited
clientUpdateProhibited https://icann.org/epp#clientUpdateProhibited

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  NS0.PHASE8.NET 81.88.63.114

  NS1.PHASE8.NET 85.233.160.68

  NS2.PHASE8.NET 85.233.164.62

  REGISTERED yes

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