[PD] obscuring voices while maintaining intelligibility

[Hans-Christoph Steiner]

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.

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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