so that would be like an addition in log   power spectrum domain.
Mm - hmm. Mm - hmm.
And so this is saying , well , if you really do have that  sort of vocal tract envelope , and you subtract that off , what you get is the excitation. And I call that lies because you don't really have that , you just have some kind of  signal - processing trickery to get something that 's kind of smooth. It 's not really what 's happening in the vocal tract
Yeah.