[vorbis-dev] Sensitivity to sounds with frequency

[Martin C. Martin]

It turns out, I found the answer just after I posted the question. 
There's got to be a version of Murphy's law about this...

Anyway, what I was after is called Equal Loudness Curves, and they can be
found e.g. here:

http://hyperphysics.phy-astr.gsu.edu/hbase/sound/eqloud.html

Short version: they're non-linear, and the slope changes with intensity.

Thanks,
Martin

"Martin C. Martin" wrote:
> 
> Hi,
> 
> 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)?
> 
> Thanks,
> Martin
> 
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