I think of the acoustic  you know , phonetic features as being top - down. You know , you look at the phone and you say this phone is supposed to be  you know , have this feature , this feature , and this feature. Whether tha those features show up in the acoustic signal is sort of irrelevant. Whereas , an acoustic event goes the other way. Here 's the signal. Here 's some event.
Mm - hmm.
What  ? And then that  you know , that may map to this phone sometimes , and sometimes it may not. It just depen maybe depends on the context , things like that.
Mm - hmm.