Each of the frames comprises {HEAD ~ a mixed signal} containing a speech signal and {TAIL ~ a noise signal} 
containing
Each of the frames comprises { HEAD ~ a mixed signal } containing a speech signal and { TAIL ~ a noise signal }
OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL