[PD] changing volume depending on frequency

[Alexandre Quessy]

Hi,
What dB level would be great to use as a table output to play with? I
thought that 60dB would be Ok.
http://www.mail-archive.com/pd-list@iem.at/msg04224.html

It depends on the actual amplitude of the sound that is output from
the speakers. A few modifications to a table that would be generated
with that patch can be the best thing we can do AFAIK.

Next, you fiddle~ around or fft~ it to get the frequency of the sound
in order to level it.

a

2007/7/16, Andy Farnell <padawan12 at obiwannabe.co.uk>:
> 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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-- 
Alexandre Quessy
http://alexandre.quessy.net
http://www.puredata.info/Members/aalex