On 21/09/2011 22:44, Hans-Christoph Steiner wrote:
I'm trying to come up with a simple voice scrambling technique that leaves voices understandable, but makes them unrecognizable. A key part of this is to make it very hard to reverse the scrambling to make the voice more recognizable.
Ineresting. Also these possible approaches come to mind:
- Trivial, probably off-topic: use a TTS. Only thing that is
recognisable is the software which produced it.
- Use some sort of granulation with random pitch-shifting. Not sure how
easily reversible this would be.
A fun thing might be mix the two: that is start from a TTS and then feed it into the granular... Here a silly example made with Festival TTS and granulation in Granita (the first sentence is the 'original' produced by Fesival) with different settings and degrees of recognisability:
http://lorenzosu.altervista.org/temp/dump/voice01.ogg
Lorenzo
I'm currently thinking that a ring modulator would work well for this, and it uses minimal CPU. Can anyone think of a way to reverse the ring modulation? I attached my quick sketch.
.hc
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