[scilab-Users] carpet of frequencies over time - ideas or hints?

[Samuel GOUGEON]

  Hi,

----- Message d'origine -----
De : Erhy
Date : 13/10/2010 09:42:
> Hello,
>
> for a music choir I want to generate
>
> a 3D plot with spectral frequencies over time
> and traces of the "should be" keynotes.
>
> Thank you for discussion
>
> Erhy
>
> PS. My first steps of ftt over a piece of music:
mapsound() will likely do what you whish, what is described by Mike Page
(see also http://en.wikipedia.org/wiki/Welch_method ).
You may easily customize it in order to plot the map in 3D instead of
as a flat colored plot.
edit mapsound
and for instance add something like
scf(); plot3d(x_abs, y_abs,-M)
instead of in addition to the grayplot() command.

Hope this helps
Regards
Samuel

PS: In your own script, you may use max() instead of maxi() that was
removed from Scilab some months ago.