24 Apr
2015
24 Apr
'15
10:52 p.m.
On Fri, Apr 24, 2015 at 12:44:20PM +0200, anders.vinjar(a)bek.no wrote:
S> Hi, Is there any software that can create a
negative of the
S> sound? I'm thinking of taking an arbitrary frequency bandwith,
S> pick a center and invert it, so that bass becomes high, and high
S> becomes bass?
This is a standard phase-vocoder trick. You'll find examples showing
this in many common dsp-packages, eg. CLM, SC3, Csound etc.
It was even done in the analog days, using techniques similar
to single side band modulation, and used as a primitive form
of voice encryption.
Ciao,
--
FA
A world of exhaustive, reliable metadata would be an utopia.
It's also a pipe-dream, founded on self-delusion, nerd hubris
and hysterically inflated market opportunities. (Cory Doctorow)