[LAU] Create A Negative of the sound

[Fons Adriaensen]

On Fri, Apr 24, 2015 at 12:44:20PM +0200, anders.vinjar at 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

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