[PD] obscuring voices while maintaining intelligibility

Hans-Christoph Steiner hans at at.or.at
Thu Sep 22 19:15:16 CEST 2011


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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