Decibel Ratings and Hazardous Time; Exposures of Common Noises; Decibels (dB) are measured logarithmically. An increase of 10 dB is ten times as loud. Thus, 80 dB is 10 times louder than 70 dB and 90 dB is 100 times louder than 70 dB. Typical level(Decibels) Example;
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www.pegasusrotorcraft.com/supportdocuments/SoundRatings...
www.pegasusrotorcraft.com/supportdocuments/SoundRatings.pdf
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An increase in the sound intensity by a factor of 10 does increase the decibel rating by adding 10. However, it is perceived by the ear as less. For example, an increase of the decibel rating from 100 to 110 would be perceived as roughly a 10% increase and NOT a factor of 10, which would be a 1000% increase.
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www.newton.dep.anl.gov/askasci/eng99/eng99325.htm
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Perceptions of Increases in Decibel Level ... Statistics for the Decibel (Loudness) Comparison Chart were taken from a study by Marshall Chasin , M.Sc., Aud(C), FAAA, Centre for Human Performance & Health, Ontario, Canada.
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www.gcaudio.com/resources/howtos/loudness.html
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This is a discussion on Exhaust volume decibel ratings within the 4.6 Tech forums, part of the 4.6L Mustang category; Does anyone know if there are any websites that have actual solid decibel level numbers for various exhaust systems?
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forums.stangnet.com/archive/index.php/t-527003.html
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re: Decibel ratings on tuners ... Maybe in reply to: Nathania Chaney Aiello: "Decibel ratings on tuners" ... >that the decibel scale was designed so that 0 was the threshold of human ; >hearing and positive numbers were used for sound that humans (on average) ; >could hear. So today, a sharp kid brings in the specs for...
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www.exo.net/ti/pinhole/hypermail-03/0495.html
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Chain saw, Rock concert ... Personal stereo system at maximum level ... Wood shop, Snowmobile...
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www.nidcd.nih.gov/health/hearing/ruler.asp
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Restaurant critics should include a note on the average decibel levels in a restaurant in their review. A note on the presence and type of background music could also be helpful in enabling the discerning diner to make a more informed choice of the suitable eaterie for them.
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www.globalideasbank.org/site/bank/idea.php?ideaId=2511
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A small unit of comparison, the decibel, was established. One decibel (1 dB) is one-tenth of a Bel. Since a decibel is one-tenth of a Bel, then 10 decibels (10 dB) would equal one Bel. In other words, a sound that is twice as loud as another sound could be described as being 10 decibels (10 dB) louder.
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www.soundinstitute.com/article_detail.cfm/ID/95
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Nevertheless, a basic explanation of the decibel measurement system is necessary for you to understand the significance of dB readings and equipment gain ratings which are expressed in decibels.
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www.tpub.com/neets/book11/45e.htm
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