[PD] changing volume depending on frequency

[Marko Timlin]

Hi andy,
many thanks for your infos. the link you gave me helps a lot, but how can I get more informtaion about the lookup tables you mentioned? I have never used them before, so they are still quite a mystery.

thanks,
m.



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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