[microsound] registering volume modulation

[Info ( Aevox )]

slow presure variations (weather changes, low rumble) will are not longer
percevale as audio (trough the ear). E.g. the tube of Eustachius will open
to release the pressure difference between the outer and middle ear. If not,
the tension on the membrane will become to big. (in negative or positive
sense)

-----Oorspronkelijk bericht-----
Van: microsound-bounces at or8.net [mailto:microsound-bounces at or8.net] Namens
Renato Fabbri
Verzonden: dinsdag 1 december 2009 17:29
Aan: microsound at microsound.org
Onderwerp: Re: [microsound] registering volume modulation

> Most people cannot hear frequencies below 20hz, so any harmonic component
> lower than 20hz is heard as volume change rather than a part of the
timbre.

Really? I would not be so sure, like, your chin or nose trembling at
5Hz doesnt make any sound at all to me, why would it add volume to
another sound happening at the same time?

>
> 1/20*1000 gives 50 --- 50 ms or longer chunks should probably work. RMS
> will tell you more about the sound's perceived amplitude than peak will.
> For extra credit you could do an fft and figure out the sone level for
> the sound (the sone scale is weighted for human perceptual nonlinearities
-
> the frequencies that we hear best add more to the score).
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