[PD] changing volume depending on frequency

[Andy Farnell]

On Sun, 15 Jul 2007 12:11:13 -0400
"Chuckk Hubbard" <badmuthahubbard at gmail.com> wrote:

> Howdy, Andy.
> Another interesting effect (don't remember what they call it) is that at
> certain high frequencies, subjects tend to report that the frequency changes
> as the volume changes, when in reality the volume is all that changes.  Hmm,
> I bet there was a way to say that with half as many words...
> But regardless, I would personally never touch this phenomenon in my own
> experiments, it's just too slippery.

Wow...that is very interesting! I never heard of that effect. Anyone
got clues to experimental data?


> 
> -Chuckk
> 
> On 7/14/07, Andy Farnell <padawan12 at obiwannabe.co.uk> wrote:
> >
> >
> >
> > One thing you might like to look at is the Fletcher Munsen curve. There
> > isn't a
> > hard mathematical relationship between perceived amplitude (loudness) and
> > frequency, it's more of a biological and psychoacoustic effect, and
> > somewhat
> > subjective between listeners.
> >
> >
> > http://ccrma.stanford.edu/CCRMA/Courses/SummerWorkshops/96/Psychoacoustics/labs/loudness/
> >
> > The Pd solution to this is to use lookup tables to scale amplitude, a bit
> > less
> > fiddly than setting up a piecewise function.
> >
> >
> > On Fri, 13 Jul 2007 21:21:37 +0200
> > Marko Timlin <susi at timlin.de> wrote:
> >
> > > I am working on a patch where I want to change the volume of the sound
> > depending of the frequency it´s played at.
> > > as we hear frequency logarithimically my idea is:
> > > the higher the pitch the more silent the volume and the lower the pitch
> > the higher the volume. and all that according to the logarithmic fashion in
> > which the human auditory system processes frequencies, as we do not perceive
> > them with equal sensitivity.
> > >
> > > any ideas???
> > >
> > > thanks,
> > > m.
> > >
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> 
> 
> 
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