[PD] changing volume depending on frequency

[Andy Farnell]

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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