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Pretty sure the idea is to use an EER (envelope elimination and restoration) technique similar to what Guido PE1NNZ implemented on his QCX modification and later (tr)uSDX. There's a big thread here talking about: /g/QRPLabs/topic/29572792
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73
Andrew KI7FXL

I know it's not implemented yet, and it's unknown if it ever will be, and
I have very little interest in SSB anyway, but I can't help to wonder.
What is the original idea?

There's a synthesizer that can produce a single frequency, and a way to
modulate this frequency with amplitude modulation, and that's really all
there is.

Is it even theoretically possible for the MCU to do some magic with this
modulation that will result in voice on a USB or LSB, without any other
hardware tricks?