"At 80 dB(A) exposure time shall be limited to 40 hours/week, whereas at 89 dB(A) exposure time shall be limited to 5 hours/week. For other exposure levels a linear intra- and extrapolation applies."
I'll put this here for others to check while I do the rest of the design: maximum time per week = a function of volume 40 h = f(80 dB(A)) 5 h = f(89 dB(A)) linear intra- and extrapolation ∴ maximum time per week = m × volume + c m = (40h – 5h) ÷ (80 dB(A) – 89 dB(A)) = 35 h ÷ –9 dB(A) = –3.889 h/dB(A) 40h = –3.889 h/dB(A) × 80 dB(A) + c c = 40h – (–3.889 h/dB(A) × 80 dB(A)) = 351.111 h ∴ maximum time per week = –3.889 h/dB(A) × volume + 351.111 h. A quick graph of this formula looks right, at least. ** Attachment added: "graph of the formula" https://bugs.launchpad.net/ubuntu-ux/+bug/1373404/+attachment/4220266/+files/EU%20volume%20limits%20graph.png -- You received this bug notification because you are a member of Ubuntu Touch seeded packages, which is subscribed to unity8 in Ubuntu. https://bugs.launchpad.net/bugs/1373404 Title: No warning of high volume level Status in Ubuntu UX bugs: In Progress Status in “unity8” package in Ubuntu: Confirmed Bug description: The EU has a legal requirement for personal music players to prevent hearing damage. http://eur-lex.europa.eu/legal-content/EN/TXT/HTML/?uri=CELEX:32009D0490&rid=1 ____________ For the purpose of this Decision, a ‘personal music player’ means a portable device, that is not covered by Directive 1999/5/EC or Directive 2006/95/EC, with headphones or earphones, used to listen to recorded, generated or broadcasted sound. 1. For the purpose of Article 4(1)(a) of Directive 2001/95/EC, the safety requirement for personal music players shall be the following: Personal music players shall be designed and manufactured in a manner that ensures that, under reasonably foreseeable conditions of use, they are inherently safe and do not cause hearing damage. 2. The requirement set out in paragraph 1 shall include in particular the following: (1) Exposure to sound levels shall be time limited to avoid hearing damage. At 80 dB(A) exposure time shall be limited to 40 hours/week, whereas at 89 dB(A) exposure time shall be limited to 5 hours/week. For other exposure levels a linear intra- and extrapolation applies. Account shall be taken of the dynamic range of sound and the reasonably foreseeable use of the products. (2) Personal music players shall provide adequate warnings on the risks involved in using the device and to the ways of avoiding them and information to users in cases where exposure poses a risk of hearing damage. ____________ Related documents: http://ec.europa.eu/health/opinions/en/hearing-loss-personal-music-player-mp3/ http://europa.eu/rapid/press-release_IP-08-1492_en.htm http://ec.europa.eu/news/environment/090928_en.htm http://europa.eu/rapid/press-release_IP-09-1364_en.htm [Originally reported in private bug 1370591.] To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu-ux/+bug/1373404/+subscriptions -- Mailing list: https://launchpad.net/~touch-packages Post to : touch-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~touch-packages More help : https://help.launchpad.net/ListHelp
