Yeah.
uh , you know , at the beginning of a  of a  of an S sound for instance , just starting in , it might be pretty low - energy ,
Mm - hmm.
but it will tend to have this high - frequency component. Whereas ,  a  a lot of rumble , and background noises , and so forth will be predominantly low - frequency. Uh , you know , by itself it 's not enough to tell you , but it plus energy is sort of