On Sep 22, 2011, at 5:29 AM, Lorenzo Sutton wrote:
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
That sound has a lot of nice examples, can you share the patch for
that? text-to-speech is interesting, but that requires speech-to-
text, which is error prone and not something you can easily run in
realtime on a phone while processing video. Granular can be heavy too,
but I suppose I could try a lightweight version.
.hc
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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