A system determines {TAIL ~ a power spectral density} associated with an audio signal that includes {HEAD ~ a speech signal} and a noise signal 
A system determines { TAIL ~ a power spectral density } associated with an audio signal that includes { HEAD ~ a speech signal } and a noise signal
OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH