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