Re: Headphones etc


Subject: Re: Headphones etc
From: Daniel Leduc. (leducd@ERE.UMontreal.CA)
Date: Mon May 31 1999 - 00:18:32 EDT


>If they are 'open' headphones (foam ear pads), external sounds come in
>relatively unattenuated. If the student doing the project would like to
>have a dynamic range of (say) 50 dB, if the ambient sound level in the
>lab is 55 dB (machines, movement, talking), then there wil be peak levels
>of 105 dB. While a minor hazard if it is occasional, under Canadian labor
>standards, exposure to about 3 minutes per day of 95 dB, is considered a
>safety hazard, and ear protection is required.

Kevin... 50 dB + 50 dB font 53 dB et non 100 dB.

N'est-ce pas?

dan.

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Daniel Leduc (D.Mus. M.Mus.) * To be is to do (Socrate)
leducd@ere.umontreal.ca * To do is to be (Sartre)
leduc.daniel@uqam.ca * To be do be do (Sinatra)
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