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