Human Noise Perception
Noral D. Stewart
noral at ix.netcom.com
Sat Nov 9 19:17:44 EST 1996
> Hello to all.
> i'm interested in the transition from noise spectrum to the level of
> annoyance. I have measured noise spectrum in dBSPL and i want to find out if
> that noise cause damage to whom who listens to it.
> i know that there are graphs and tables for it, but i am looking for a well
> defined algorithm and maybe a computer program for the calculation.
> also, are there any formulas, instead of graphs for calculating dB(A) out of
> Itay (yaele at post.tau.ac.il)
This may be more appropriate for posting in alt.sci.physics.acoustics.
I will forward it there.
Computing A-weighted sound level from octave band or third octave
data is simply a matter of applying the proper weighting to each band,
dividing each band result by 10, taking the antilog of each, summing all
the band antilogs, then taking the log of the sum and multiplying by 10.
Annoyance and physical damage are two different effects of noise.
A third is interference with activity such as speech or sleep. The most
certain physical damage is that to hearing from exposure to very loud
noise. Activity interference can occur at lower levels. Annoyance
results partially from activity interference. However, it can also
result from deterioration of the acoustical quality of the environment
that can occur at very low levels. There is much research on these
aspects of noise in the literature. Try the Journal of the Acoustical
Society of America, Journal of Sound and Vibration, or Acustica.
More information about the Audiolog