[vorbis-dev] Sensitivity to sounds with frequency

[Matthijs Laan]

On Sun 07 Jul 2002 17:58:17, "Martin C. Martin" <martin at metahuman.org>
wrote: 

> I've looked in various FAQs and web pages for this info, but just
> can't seem to find it.
> 
> When two tones of two different frequencies sound equally loud, what's
> the (rough) relationship between their power?  This is for percussive
> sounds in music, but I assume it's roughly the same for all sounds. 
> The ear seems more sensitive at high frequencies.  For example, when
> you alternate bass drum and high hat, and you adjust them until they
> both sound about the same, the RMS power of the high hat is a lot
> smaller than the bass drum.  Is the sensitivity roughly  1 /
> frequency?  1 / sqrt(frequency)? 

It isn't easily caught in a formulae - I guess we would need ear/brain 
surgery to find it out exactly...

More seriously, this has been measured. You can find a graph and info at 

  http://privatewww.essex.ac.uk/~djmrob/replaygain/equal_loudness.html
(from http://www.replaygain.org/ )

The first image is the one you want.

Matthijs

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