One of the surprises we had from the Google ML version of Codec2 was
that it replaced the harmonics in the speech that the CODEC did not
actually encode. This is called "bandwidth extension" and is actually
well-known CODEC tech, we just didn't do it. I am going to experiment
with a 16 KHz output of the CODEC that does this.
The code has progressed a lot. There is now a full fixed-point
implementation and it is within four nines of the data produced by
David's reference CODEC.
Thanks
Bruce
--
Bruce Perens K6BP
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