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