At 04:18 PM 3/15/99 -0600, pete moss wrote:
>it does this because human ears dont perceive all frequencies at the same
>loudness even if they have the same amplitude.  you could find a table in
>almost any acoustics book that shows the relative loudness for all freqs.  you
>could then make a table of the inverse of that function that would be used to
>raise or lower the amplitude at different freqs so that it would sound the
>same loudness across the spectrum.  however, every ear is different, so not
>everyone would perceive it properly.

bessel functions possibly? they're pretty.
-jim altieri

http://www.mp3.com/tweeg/