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